Ian Lewis - Editor

Ian Lewis
Are you Ian Lewis?

Claim your profile, edit publications, add additional information:

Contact Details

Name
Ian Lewis
Affiliation
Editor
City
Missoula
Country
United States

Pubs By Year

External Links

Pub Categories

 
Astrophysics (21)
 
High Energy Physics - Phenomenology (18)
 
High Energy Physics - Experiment (6)
 
Astrophysics of Galaxies (5)
 
Cosmology and Nongalactic Astrophysics (5)
 
Instrumentation and Methods for Astrophysics (5)
 
Quantitative Biology - Subcellular Processes (1)
 
Quantitative Biology - Cell Behavior (1)
 
Quantitative Biology - Biomolecules (1)

Publications Authored By Ian Lewis

The simplest extension of the Standard Model is to add a gauge singlet scalar, $S$: the singlet extended Standard Model. In the absence of a $Z_2$ symmetry $S\rightarrow -S$ and if the new scalar is sufficiently heavy, this model can lead to resonant double Higgs production, significantly increasing the production rate over the Standard Model prediction. While searches for this signal are being performed, it is important to have benchmark points and models with which to compare the experimental results. Read More

We analyse the sizes, colour gradients, and resolved stellar mass distributions for 36 massive and passive galaxies in the cluster XMMUJ2235-2557 at z=1.39 using optical and near-infrared Hubble Space Telescope imaging. We derive light-weighted S\'ersic fits in five HST bands ($i_{775},z_{850},Y_{105},J_{125},H_{160}$), and find that the size decreases by ~20% going from $i_{775}$ to $H_{160}$ band, consistent with recent studies. Read More

WEAVE is a 1000-fiber multi-object spectroscopic facility for the 4.2~m William Herschel Telescope. It will feature a double-headed pick-and-place fiber positioning robot comprising commercially available robotic axes. Read More

We report the multi-wavelength identification of the X-ray sources found in the Subaru-XMM-Newton Deep Survey (SXDS) using deep imaging data covering the wavelength range between the far-UV to the mid-IR. We select a primary counterpart of each X-ray source by applying the likelihood ratio method to R-band, 3.6micron, near-UV, and 24micron source catalogs as well as matching catalogs of AGN candidates selected in 1. Read More

We present an overview of and status report on the WEAVE next-generation spectroscopy facility for the William Herschel Telescope (WHT). WEAVE principally targets optical ground-based follow up of upcoming ground-based (LOFAR) and space-based (Gaia) surveys. WEAVE is a multi-object and multi-IFU facility utilizing a new 2-degree prime focus field of view at the WHT, with a buffered pick-and-place positioner system hosting 1000 multi-object (MOS) fibres, 20 integral field units, or a single large IFU for each observation. Read More

We try to constrain the gas inflow and outflow rate of star-forming galaxies at $z\sim1.4$ by employing a simple analytic model for the chemical evolution of galaxies. The sample is constructed based on a large near-infrared (NIR) spectroscopic sample observed with Subaru/FMOS. Read More

The insular nature of the Standard Model may be explained if the Higgs mass parameter is only sensitive to quantum corrections from physical states. Starting from a scale-free electroweak sector at tree-level, we postulate that quantum effects of heavy right-handed neutrinos induce a mass term for a scalar weak doublet that contains the dark matter particle. In turn, below the scale of heavy neutrinos, the dark matter sector sets the scale of the Higgs potential. Read More

We examine the possibility that dark matter may be the manifestation of dark forces of a hidden sector, i.e. "Dark Force = Dark Matter. Read More

The discovery of a Higgs boson at the LHC begins the era of directly measuring the mechanism of electroweak symmetry breaking (EWSB). Searching for extensions of the Standard Model (SM) EWSB sector at the LHC is of vital importance. An important extension of the SM with an extended EWSB sector is the Minimal Supersymmetric Standard Model (MSSM). Read More

We analyze experimental observations of microtubules undergoing small fluctuations about a "balance point" when mixed in solution of two different kinesin motor proteins, KLP61F and Ncd. It has been proposed that the microtubule movement is due to stochastic variations in the densities of the two species of motor proteins. We test this hypothesis here by showing how it maps onto a one-dimensional random walk in a random environment. Read More

The next-to-leading order (NLO) QCD radiative corrections to W+W- production at hadron colliders are well understood. We combine NLO perturbative QCD calculations with soft-gluon resummation of threshold logarithms to find a next-to-next-to leading logarithmic (NNLL) prediction for the total cross section and the invariant mass distribution at the LHC. We also obtain approximate next-to-next-to-leading order (NNLO) results for the total W+W- cross section at the LHC which includes all contributions from the scale dependent leading singular terms. Read More

A light vector boson, Z_d, associated with a "dark sector" U(1)_d gauge group has been introduced to explain certain astrophysical observations as well as low energy laboratory anomalies. In such models, the Higgs boson may decay into X+Z_d, where X=Z, Z_d or \gamma. Here, we provide estimates of those decay rates as functions of the Z_d coupling through either mass-mixing (e. Read More

We study the observability for a heavy Majorana neutrino N along with a new charged gauge boson W' at the LHC. We emphasize the complementarity of these two particles in their production and decay to unambiguously determine their properties. We show that the Majorana nature of N can be verified by the lepton-number violating like-sign dilepton process, and by polar and azimuthal angular distributions. Read More

We show that weak scale vector-like fermions with order one couplings to the Higgs can lead to a novel mechanism for a strongly first-order electroweak phase transition (EWPhT), through their tendency to drive the Higgs quartic coupling negative. These same fermions could also enhance the loop-induced branching fraction of the Higgs into two photons, as suggested by the recent discovery of a ~125 GeV Higgs-like state at the CERN Large Hadron Collider (LHC). Our results suggest that measurements of the diphoton decay rate of the Higgs and its self coupling, at the LHC or perhaps at a future lepton collider, could probe the EWPhT in the early Universe, with significant implications for the viability of electroweak baryogenesis scenarios. Read More

In many new physics scenarios, the particle content of the Standard Model is extended and the Higgs couplings are modified, sometimes without affecting single Higgs production. We analyse two models with additional quarks. In these models, we compute double Higgs production from gluon fusion exactly at leading-order, and present analytical results in the heavy-quark mass ap- proximation. Read More

We study the observability of the Higgs boson in the "charming Higgs" model. In this model the Higgs boson primarily undergoes a cascade decay to four charm quarks via light intermediate pseudoscalars. Such a decay allows the Higgs boson to escape the most stringent LEP bounds on the Standard Model Higgs boson mass. Read More

If fermion condensation is a main source of electroweak symmetry breaking, an ultra-heavy Higgs doublet of mass ~10^8 GeV can yield naturally small Dirac neutrino masses. We show that such a scenario can lead to a new leptogenesis mechanism based on the decays of the ultra-heavy Higgs. Given its very large mass, the requisite Higgs doublet can be considered an elementary particle and would point to a cutoff scale ~10^10 GeV. Read More

2011May
Authors: Daniele Alves1, Nima Arkani-Hamed2, Sanjay Arora3, Yang Bai4, Matthew Baumgart5, Joshua Berger6, Matthew Buckley7, Bart Butler8, Spencer Chang9, Hsin-Chia Cheng10, Clifford Cheung11, R. Sekhar Chivukula12, Won Sang Cho13, Randy Cotta14, Mariarosaria D'Alfonso15, Sonia El Hedri16, Rouven Essig17, Jared A. Evans18, Liam Fitzpatrick19, Patrick Fox20, Roberto Franceschini21, Ayres Freitas22, James S. Gainer23, Yuri Gershtein24, Richard Gray25, Thomas Gregoire26, Ben Gripaios27, Jack Gunion28, Tao Han29, Andy Haas30, Per Hansson31, JoAnne Hewett32, Dmitry Hits33, Jay Hubisz34, Eder Izaguirre35, Jared Kaplan36, Emanuel Katz37, Can Kilic38, Hyung-Do Kim39, Ryuichiro Kitano40, Sue Ann Koay41, Pyungwon Ko42, David Krohn43, Eric Kuflik44, Ian Lewis45, Mariangela Lisanti46, Tao Liu47, Zhen Liu48, Ran Lu49, Markus Luty50, Patrick Meade51, David Morrissey52, Stephen Mrenna53, Mihoko Nojiri54, Takemichi Okui55, Sanjay Padhi56, Michele Papucci57, Michael Park58, Myeonghun Park59, Maxim Perelstein60, Michael Peskin61, Daniel Phalen62, Keith Rehermann63, Vikram Rentala64, Tuhin Roy65, Joshua T. Ruderman66, Veronica Sanz67, Martin Schmaltz68, Stephen Schnetzer69, Philip Schuster70, Pedro Schwaller71, Matthew D. Schwartz72, Ariel Schwartzman73, Jing Shao74, Jessie Shelton75, David Shih76, Jing Shu77, Daniel Silverstein78, Elizabeth Simmons79, Sunil Somalwar80, Michael Spannowsky81, Christian Spethmann82, Matthew Strassler83, Shufang Su84, Tim Tait85, Brooks Thomas86, Scott Thomas87, Natalia Toro88, Tomer Volansky89, Jay Wacker90, Wolfgang Waltenberger, Itay Yavin, Felix Yu, Yue Zhao, Kathryn Zurek
Affiliations: 1Editor, 2Editor, 3Editor, 4Editor, 5Editor, 6Editor, 7Editor, 8Editor, 9Editor, 10Editor, 11Editor, 12Editor, 13Editor, 14Editor, 15Editor, 16Editor, 17Editor, 18Editor, 19Editor, 20Editor, 21Editor, 22Editor, 23Editor, 24Editor, 25Editor, 26Editor, 27Editor, 28Editor, 29Editor, 30Editor, 31Editor, 32Editor, 33Editor, 34Editor, 35Editor, 36Editor, 37Editor, 38Editor, 39Editor, 40Editor, 41Editor, 42Editor, 43Editor, 44Editor, 45Editor, 46Editor, 47Editor, 48Editor, 49Editor, 50Editor, 51Editor, 52Editor, 53Editor, 54Editor, 55Editor, 56Editor, 57Editor, 58Editor, 59Editor, 60Editor, 61Editor, 62Editor, 63Editor, 64Editor, 65Editor, 66Editor, 67Editor, 68Editor, 69Editor, 70Editor, 71Editor, 72Editor, 73Editor, 74Editor, 75Editor, 76Editor, 77Editor, 78Editor, 79Editor, 80Editor, 81Editor, 82Editor, 83Editor, 84Editor, 85Editor, 86Editor, 87Editor, 88Editor, 89Editor, 90Editor

This document proposes a collection of simplified models relevant to the design of new-physics searches at the LHC and the characterization of their results. Both ATLAS and CMS have already presented some results in terms of simplified models, and we encourage them to continue and expand this effort, which supplements both signature-based results and benchmark model interpretations. A simplified model is defined by an effective Lagrangian describing the interactions of a small number of new particles. Read More

We study the colored resonance production at the LHC in a most general approach. We classify the possible colored resonances based on group theory decomposition, and construct their effective interactions with light partons. The production cross section from annihilation of valence quarks or gluons may be on the order of 400 - 1000 pb at LHC energies for a mass of 1 TeV with nominal couplings, leading to the largest production rates for new physics at the TeV scale, and simplest event topology with dijet final states. Read More

The OPTIMOS-EVE instrument proposed for the E-ELT aims to use the maximum field of view available to the E-ELT in the limit of natural or ground-layer-corrected seeing for high multiplex fibre-fed multi-object spectroscopy in the visible and near-IR. At the bare nasmyth focus of the telescope, this field corresponds to a focal plane 2.3m in diameter, with a plate-scale of ~3mm/arcsec. Read More

If a TeV-scale charged gauge boson (W') is discovered at the Large Hadron Collider (LHC), it will become imperative to determine its chiral couplings to standard model (SM) fermions in order to learn about the underlying theory containing the W'. We describe the reconstruction of the t, b decay mode of the W' at the LHC, and identify various kinematic observables such as the angular distributions of the top quark and the lepton resulting from top decay that can be used to disentangle the chiral couplings of the W' to SM fermions. We demonstrate by presenting analytical expressions, numerical simulations, as well as intuitive illustrations for these observables at the LHC that among the SM fermions, the polarized top quark can most directly probe the chirality of such couplings. Read More

2010Aug
Affiliations: 1Isaac Newton Group of Telescopes, La Palma, Spain, 2Isaac Newton Group of Telescopes, La Palma, Spain, 3Astrophysics Research Institute, Liverpool John Moores University, UK, 4Physics Department, University of Oxford, UK, 5Kapteyn Astronomical Institute, University of Groningen, The Netherlands, 6Lund Observatory, Sweden, 7Kapteyn Astronomical Institute, University of Groningen, The Netherlands, 8Centre for Astrophysics Research, University of Hertfordshire, UK, 9Institute of Cosmology and Gravitation, University of Portsmouth, UK, 10Isaac Newton Group of Telescopes, La Palma, Spain, 11Isaac Newton Group of Telescopes, La Palma, Spain, 12Leiden Observatory, Leiden University, The Netherlands, 13Isaac Newton Group of Telescopes, La Palma, Spain, 14UK Astronomy Technology Centre, Edinburgh, UK, 15Kapteyn Astronomical Institute, University of Groningen, The Netherlands, 16Physics Department, University of Oxford, UK, 17UK Astronomy Technology Centre, Edinburgh, UK, 18Kapteyn Astronomical Institute, University of Groningen, The Netherlands, 19Instituto de Astrofísica de Canarias, Tenerife, Spain, 20Centre for Advanced Instrumentation, University of Durham, UK, 21STFC-Rutherford-Appleton Laboratory, UK, 22Instituto de Astrofísica de Canarias, Tenerife, Spain, 23Institute of Astronomy, University of Cambridge, UK, 24Kapteyn Astronomical Institute, University of Groningen, The Netherlands

Wide-field multi-object spectroscopy is a high priority for European astronomy over the next decade. Most 8-10m telescopes have a small field of view, making 4-m class telescopes a particularly attractive option for wide-field instruments. We present a science case and design drivers for a wide-field multi-object spectrograph (MOS) with integral field units for the 4. Read More

Fibre Multi-Object Spectrograph (FMOS) is the first near-infrared instrument with a wide field of view capable of acquiring spectra simultaneously from up to 400 objects. It has been developed as a common-use instrument for the F/2 prime-focus of the Subaru Telescope. The field coverage of 30' diameter is achieved using a new 3-element corrector optimized in the near-infrared (0. Read More

Motivated by large nu_mu-nu_tau flavor mixing, we consider mu-tau production at hadron colliders via dimension-6 effective operators, which can be attributed to new physics in the flavor sector at a higher scale Lambda. Current bounds on many of these operators from low energy experiments are very weak or nonexistent, and they may lead to clean mu+tau- and mu-tau+ signals at hadron colliders. At the Tevatron with 8 inverse femtobarns, one can exceed current bounds for most operators, with most 2 sigma sensitivities being in the 6-24 TeV range. Read More

We calculate the next-to-leading order QCD corrections to quark-quark annihilation to a scalar resonant state ("diquark") in a color representation of antitriplet or sextet at the Tevatron and LHC energies. At the LHC, we find the enhancement (K-factor) for the antitriplet diquark is typically about 1.31--1. Read More

We calculate cosmological and astrophysical bounds on the couplings between standard model fields and tensor unparticles. The present day density of tensor unparticles from neutrino-neutrino and photon-photon annihilation is calculated. Also, the supernovae volume energy loss rates from electron-positron and photon-photon annihilation to tensor unparticles are calculated. Read More

We investigate the correlated predictions of singlet extended MSSM models for direct detection of the lightest neutralino with its cosmological relic density. To illustrate the general effects of the singlet, we take heavy sleptons and squarks. We apply LEP, $(g-2)_\mu$ and perturbativity constraints. Read More

The ROSAT-ESO Flux Limited X-ray (REFLEX) galaxy cluster survey and the 2dF Galaxy Redshift Survey (2dFGRS) respectively comprise the largest, homogeneous X-ray selected cluster catalogue and completed galaxy redshift survey. In this work we combine these two outstanding datasets in order to study the effect of the large-scale cluster environment, as traced by X-ray luminosity, on the properties of the cluster member galaxies. We measure the LX-sigma relation from the correlated dataset and find it to be consistent with recent results found in the literature. Read More

We select a sample of low-redshift (z ~ 0.1) E+A galaxies from the 2dF Galaxy Redshift Survey (2dFGRS). The spectra of these objects are defined by strong hydrogen Balmer absorption lines (H-delta, H-gamma, H-beta) combined with a lack of [OII] 3727A emission, together implying a recently-truncated burst of star formation. Read More

We present preliminary results from a programme to obtain multi-object near-infrared spectroscopy of galaxies at redshifts $0.7Read More

2004Jun
Affiliations: 1The 2dFGRS Team, 2The 2dFGRS Team, 3The 2dFGRS Team, 4The 2dFGRS Team, 5The 2dFGRS Team, 6The 2dFGRS Team, 7The 2dFGRS Team, 8The 2dFGRS Team, 9The 2dFGRS Team, 10The 2dFGRS Team, 11The 2dFGRS Team, 12The 2dFGRS Team, 13The 2dFGRS Team, 14The 2dFGRS Team, 15The 2dFGRS Team, 16The 2dFGRS Team, 17The 2dFGRS Team, 18The 2dFGRS Team, 19The 2dFGRS Team, 20The 2dFGRS Team, 21The 2dFGRS Team, 22The 2dFGRS Team, 23The 2dFGRS Team, 24The 2dFGRS Team, 25The 2dFGRS Team, 26The 2dFGRS Team, 27The 2dFGRS Team, 28The 2dFGRS Team, 29The 2dFGRS Team
Category: Astrophysics

We present the result of a decomposition of the 2dFGRS galaxy overdensity field into an orthonormal basis of spherical harmonics and spherical Bessel functions. Galaxies are expected to directly follow the bulk motion of the density field on large scales, so the absolute amplitude of the observed large-scale redshift-space distortions caused by this motion is expected to be independent of galaxy properties. By splitting the overdensity field into radial and angular components, we linearly model the observed distortion and obtain the cosmological constraint Omega_m^{0. Read More

Complementary one-, two-, and three-dimensional tests for detecting the presence of substructure in clusters of galaxies are applied to recently obtained data from the 2dF Galaxy Redshift Survey. The sample of 25 clusters used in this study includes 16 clusters not previously investigated for substructure. Substructure is detected at or greater than the 99% CL level in at least one test for 21 of the 25 clusters studied here. Read More

We derive the fraction of blue galaxies in a sample of clusters at z < 0.11 and the general field at the same redshift. The value of the blue fraction is observed to depend on the luminosity limit adopted, cluster-centric radius and, more generally, local galaxy density, but it does not depend on cluster properties. Read More

2003Dec
Affiliations: 1the 2dFGRS Team, 2the 2dFGRS Team, 3the 2dFGRS Team, 4the 2dFGRS Team, 5the 2dFGRS Team, 6the 2dFGRS Team, 7the 2dFGRS Team, 8the 2dFGRS Team, 9the 2dFGRS Team, 10the 2dFGRS Team, 11the 2dFGRS Team, 12the 2dFGRS Team, 13the 2dFGRS Team, 14the 2dFGRS Team, 15the 2dFGRS Team, 16the 2dFGRS Team, 17the 2dFGRS Team, 18the 2dFGRS Team, 19the 2dFGRS Team, 20the 2dFGRS Team, 21the 2dFGRS Team, 22the 2dFGRS Team, 23the 2dFGRS Team, 24the 2dFGRS Team, 25the 2dFGRS Team, 26the 2dFGRS Team, 27the 2dFGRS Team
Category: Astrophysics

The clustering properties of local, S_{1.4 GHz} > 1 mJy, radio sources are investigated for a sample of 820 objects drawn from the joint use of the FIRST and 2dF Galaxy Redshift surveys. To this aim, we present 271 new bj < 19. Read More

2003Jun
Affiliations: 1the 2dFGRS team, 2the 2dFGRS team, 3the 2dFGRS team, 4the 2dFGRS team, 5the 2dFGRS team, 6the 2dFGRS team, 7the 2dFGRS team, 8the 2dFGRS team, 9the 2dFGRS team, 10the 2dFGRS team, 11the 2dFGRS team, 12the 2dFGRS team, 13the 2dFGRS team, 14the 2dFGRS team, 15the 2dFGRS team, 16the 2dFGRS team, 17the 2dFGRS team, 18the 2dFGRS team, 19the 2dFGRS team, 20the 2dFGRS team, 21the 2dFGRS team, 22the 2dFGRS team, 23the 2dFGRS team, 24the 2dFGRS team, 25the 2dFGRS team, 26the 2dFGRS team, 27the 2dFGRS team, 28the 2dFGRS team
Category: Astrophysics

The 2dF Galaxy Redshift Survey (2dFGRS) has obtained spectra for 245591 sources, mainly galaxies, brighter than a nominal extinction-corrected magnitude limit of b_J=19.45. Reliable redshifts were measured for 221414 galaxies. Read More

2002Jun
Affiliations: 1The 2dFGRS Team, 2The 2dFGRS Team, 3The 2dFGRS Team, 4The 2dFGRS Team, 5The 2dFGRS Team, 6The 2dFGRS Team, 7The 2dFGRS Team, 8The 2dFGRS Team, 9The 2dFGRS Team, 10The 2dFGRS Team, 11The 2dFGRS Team, 12The 2dFGRS Team, 13The 2dFGRS Team, 14The 2dFGRS Team, 15The 2dFGRS Team, 16The 2dFGRS Team, 17The 2dFGRS Team, 18The 2dFGRS Team, 19The 2dFGRS Team, 20The 2dFGRS Team, 21The 2dFGRS Team, 22The 2dFGRS Team, 23The 2dFGRS Team, 24The 2dFGRS Team, 25The 2dFGRS Team, 26The 2dFGRS Team, 27The 2dFGRS Team
Category: Astrophysics

We constrain flat cosmological models with a joint likelihood analysis of a new compilation of data from the cosmic microwave background (CMB) and from the 2dF Galaxy Redshift Survey (2dFGRS). Fitting the CMB alone yields a known degeneracy between the Hubble constant h and the matter density Omega_m, which arises mainly from preserving the location of the peaks in the angular power spectrum. This `horizon-angle degeneracy' is considered in some detail and shown to follow a simple relation Omega_m h^{3. Read More

2001Dec
Affiliations: 1IoA, Cambridge, 2the 2dFGRS team, 3the 2dFGRS team, 4the 2dFGRS team, 5the 2dFGRS team, 6the 2dFGRS team, 7the 2dFGRS team, 8the 2dFGRS team, 9the 2dFGRS team, 10the 2dFGRS team, 11the 2dFGRS team, 12the 2dFGRS team, 13the 2dFGRS team, 14the 2dFGRS team, 15the 2dFGRS team, 16the 2dFGRS team, 17the 2dFGRS team, 18the 2dFGRS team, 19the 2dFGRS team, 20the 2dFGRS team, 21the 2dFGRS team, 22the 2dFGRS team, 23the 2dFGRS team, 24the 2dFGRS team, 25the 2dFGRS team, 26the 2dFGRS team, 27the 2dFGRS team, 28the 2dFGRS team, 29the 2dFGRS team
Category: Astrophysics

We compare the amplitudes of fluctuations probed by the 2dF Galaxy Redshift Survey and by the latest measurements of the Cosmic Microwave Background anisotropies. By combining the 2dFGRS and CMB data we find the linear-theory rms mass fluctuations in 8 Mpc/h spheres to be sigma_8 = 0.73 +-0. Read More

We perform a joint likelihood analysis of the power spectra of the 2dF Galaxy Redshift Survey (2dFGRS) and the cosmic microwave background (CMB) anisotropies under the assumptions that the initial fluctuations were adiabatic, Gaussian and well described by power laws with scalar and tensor indices of n_s and n_t. On its own, the 2dFGRS sets tight limits on the parameter combination Omega_m h, but relatively weak limits on the fraction of the cosmic matter density in baryons Omega_b/Omega_m. The CMB anisotropy data alone set poor constraints on the cosmological constant and Hubble constant because of a `geometrical degeneracy' among parameters. Read More

We have carried out a study of known clusters within the 2dF Galaxy Redshift Survey (2dFGRS) observed areas and have identified 431 Abell, 173 APM and 343 EDCC clusters. Precise redshifts, velocity dispersions and new centroids have been measured for the majority of these objects, and this information has been used to study the completeness of these catalogues, the level of contamination from foreground and background structures along the cluster's line of sight, the space density of the clusters as a function of redshift, and their velocity dispersion distributions. We find that the Abell and EDCC catalogues are contaminated at the level of about 10%, whereas the APM catalogue suffers only 5% contamination. Read More

2000Dec
Affiliations: 1The 2dFGRS Team, 2The 2dFGRS Team, 3The 2dFGRS Team, 4The 2dFGRS Team, 5The 2dFGRS Team, 6The 2dFGRS Team, 7The 2dFGRS Team, 8The 2dFGRS Team, 9The 2dFGRS Team, 10The 2dFGRS Team, 11The 2dFGRS Team, 12The 2dFGRS Team, 13The 2dFGRS Team, 14The 2dFGRS Team, 15The 2dFGRS Team, 16The 2dFGRS Team, 17The 2dFGRS Team, 18The 2dFGRS Team, 19The 2dFGRS Team, 20The 2dFGRS Team, 21The 2dFGRS Team, 22The 2dFGRS Team, 23The 2dFGRS Team, 24The 2dFGRS Team, 25The 2dFGRS Team, 26The 2dFGRS Team, 27The 2dFGRS Team
Category: Astrophysics

We combine the 2MASS extended source catalogue and the 2dFGRS to produce an IR selected galaxy catalogue with 17,173 measured redshifts. We use this extensive dataset to estimate the J and K-band galaxy luminosity functions. The LFs are fairly well fit by Schechter functions with J: M*-5log h= -22. Read More

We present the bivariate brightness distribution (BBD) for the 2dF Galaxy Redshift Survey (2dFGRS) based on a preliminary subsample of 45,000 galaxies. The BBD is an extension of the galaxy luminosity function incorporating surface brightness information. It allows the measurement of the local luminosity density, j_B, and the galaxy luminosity and surface brightness distributions while accounting for surface brightness selection biases. Read More

We describe a new system for multiple object spectroscopy and integral field spectroscopy at near-infrared wavelengths using optical fibers. Both modes of the SMIRFS instrument have been tested at the UK Infrared Telescope with the CGS4 infrared spectrograph. The modular system includes a common optical system to image the fiber slit onto the cold slit inside the CGS4 cryostat. Read More