Hyron Spinrad - UC Berkeley

Hyron Spinrad
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Name
Hyron Spinrad
Affiliation
UC Berkeley
City
Berkeley
Country
United States

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Astrophysics (41)
 
Cosmology and Nongalactic Astrophysics (6)
 
Astrophysics of Galaxies (3)

Publications Authored By Hyron Spinrad

We report the discovery of significant mass/light offsets in the strong gravitational lensing system SDSS\,J1011$+$0143. We use the high-resolution \textsl{Hubble Space Telescope} (\textsl{HST}) F555W- and F814W-band imaging and Sloan Digital Sky Survey (SDSS) spectroscopy of this system, which consists of a close galaxy pair with a projected separation of $\approx 4.2$ kpc at $z_{\rm lens} \sim 0. Read More

We explore the relationship between the spectral shape of the Ly{\alpha} emission and the UV morphology of the host galaxy using a sample of 304 Ly{\alpha}-emitting BV i-dropouts at 3 < z < 7 in the GOODS and COSMOS fields. Using our extensive reservoir of high-quality Keck DEIMOS spectra combined with HST WFC3 data, we measure the Ly{\alpha} line asymmetries for individual galaxies and compare them to axial ratios measured from observed J- and H-band (restframe UV) images. We find that the Ly{\alpha} skewness exhibits a large scatter at small elongation (a/b < 2), and this scatter decreases as axial ratio increases. Read More

We present observations of a luminous galaxy at redshift z=6.573 --- the end of the reioinization epoch --- which has been spectroscopically confirmed twice. The first spectroscopic confirmation comes from slitless HST ACS grism spectra from the PEARS survey (Probing Evolution And Reionization Spectroscopically), which show a dramatic continuum break in the spectrum at restframe 1216 A wavelength. Read More

We present the results of our ultra-deep Keck/DEIMOS spectroscopy of z-dropout galaxies in the SDF and GOODS-N. For 3 out of 11 objects, we detect an emission line at ~ 1um with a signal-to-noise ratio of ~ 10. The lines show asymmetric profiles with high weighted skewness values, consistent with being Lya, yielding redshifts of z=7. Read More

2011May
Authors: Norman A. Grogin, Dale D. Kocevski, S. M. Faber, Henry C. Ferguson, Anton M. Koekemoer, Adam G. Riess, Viviana Acquaviva, David M. Alexander, Omar Almaini, Matthew L. N. Ashby, Marco Barden, Eric F. Bell, Frédéric Bournaud, Thomas M. Brown, Karina I. Caputi, Stefano Casertano, Paolo Cassata, Marco Castellano, Peter Challis, Ranga-Ram Chary, Edmond Cheung, Michele Cirasuolo, Christopher J. Conselice, Asantha Roshan Cooray, Darren J. Croton, Emanuele Daddi, Tomas Dahlen, Romeel Davé, Duília F. de Mello, Avishai Dekel, Mark Dickinson, Timothy Dolch, Jennifer L. Donley, James S. Dunlop, Aaron A. Dutton, David Elbaz, Giovanni G. Fazio, Alexei V. Filippenko, Steven L. Finkelstein, Adriano Fontana, Jonathan P. Gardner, Peter M. Garnavich, Eric Gawiser, Mauro Giavalisco, Andrea Grazian, Yicheng Guo, Nimish P. Hathi, Boris Häussler, Philip F. Hopkins, Jia-Sheng Huang, Kuang-Han Huang, Saurabh W. Jha, Jeyhan S. Kartaltepe, Robert P. Kirshner, David C. Koo, Kamson Lai, Kyoung-Soo Lee, Weidong Li, Jennifer M. Lotz, Ray A. Lucas, Piero Madau, Patrick J. McCarthy, Elizabeth J. McGrath, Daniel H. McIntosh, Ross J. McLure, Bahram Mobasher, Leonidas A. Moustakas, Mark Mozena, Kirpal Nandra, Jeffrey A. Newman, Sami-Matias Niemi, Kai G. Noeske, Casey J. Papovich, Laura Pentericci, Alexandra Pope, Joel R. Primack, Abhijith Rajan, Swara Ravindranath, Naveen A. Reddy, Alvio Renzini, Hans-Walter Rix, Aday R. Robaina, Steven A. Rodney, David J. Rosario, Piero Rosati, Sara Salimbeni, Claudia Scarlata, Brian Siana, Luc Simard, Joseph Smidt, Rachel S. Somerville, Hyron Spinrad, Amber N. Straughn, Louis-Gregory Strolger, Olivia Telford, Harry I. Teplitz, Jonathan R. Trump, Arjen van der Wel, Carolin Villforth, Risa H. Wechsler, Benjamin J. Weiner, Tommy Wiklind, Vivienne Wild, Grant Wilson, Stijn Wuyts, Hao-Jing Yan, Min S. Yun

The Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey (CANDELS) is designed to document the first third of galactic evolution, over the approximate redshift (z) range 8--1.5. It will image >250,000 distant galaxies using three separate cameras on the Hubble Space Telescope, from the mid-ultraviolet to the near-infrared, and will find and measure Type Ia supernovae at z>1. Read More

2011May
Authors: Anton M. Koekemoer, S. M. Faber, Henry C. Ferguson, Norman A. Grogin, Dale D. Kocevski, David C. Koo, Kamson Lai, Jennifer M. Lotz, Ray A. Lucas, Elizabeth J. McGrath, Sara Ogaz, Abhijith Rajan, Adam G. Riess, Steve A. Rodney, Louis Strolger, Stefano Casertano, Marco Castellano, Tomas Dahlen, Mark Dickinson, Timothy Dolch, Adriano Fontana, Mauro Giavalisco, Andrea Grazian, Yicheng Guo, Nimish P. Hathi, Kuang-Han Huang, Arjen van der Wel, Hao-Jing Yan, Viviana Acquaviva, David M. Alexander Omar Almaini, Matthew L. N. Ashby, Marco Barden, Eric F. Bell, Frédéric Bournaud, Thomas M. Brown, Karina I. Caputi, Paolo Cassata, Peter Challis, Ranga-Ram Chary, Edmond Cheung, Michele Cirasuolo, Christopher J. Conselice, Asantha Roshan Cooray, Darren J. Croton, Emanuele Daddi, Romeel Davé, Duilia F. de Mello, Loic de Ravel, Avishai Dekel, Jennifer L. Donley, James S. Dunlop, Aaron A. Dutton, David Elbaz, Giovanni G. Fazio, Alex V. Filippenko, Steven L. Finkelstein, Chris Frazer, Jonathan P. Gardner, Peter M. Garnavich, Eric Gawiser, Ruth Gruetzbauch, Will G. Hartley, Boris Häussler, Jessica Herrington, Philip F. Hopkins, Jia-Sheng Huang, Saurabh Jha, Andrew Johnson, Jeyhan S. Kartaltepe, Ali Ahmad Khostovan, Robert P. Kirshner, Caterina Lani, Kyoung-Soo Lee, Weidong Li, Piero Madau, Patrick J. McCarthy, Daniel H. McIntosh, Ross J. McLure, Conor McPartland, Bahram Mobasher, Heidi Moreira, Alice Mortlock, Leonidas A. Moustakas, Mark Mozena, Kirpal Nandra, Jeffrey A. Newman, Jennifer L. Nielsen, Sami Niemi, Kai G. Noeske, Casey J. Papovich, Laura Pentericci, Alexandra Pope, Joel R. Primack, Swara Ravindranath, Naveen A. Reddy, Alvio Renzini, Hans-Walter Rix, Aday R. Robaina, David J. Rosario, Piero Rosati, Sara Salimbeni, Claudia Scarlata, Brian Siana, Luc Simard, Joseph Smidt, Diana Snyder, Rachel S. Somerville, Hyron Spinrad, Amber N. Straughn, Olivia Telford, Harry I. Teplitz, Jonathan R. Trump, Carlos Vargas, Carolin Villforth, Cory R. Wagner, Pat Wandro, Risa H. Wechsler, Benjamin J. Weiner, Tommy Wiklind, Vivienne Wild, Grant Wilson, Stijn Wuyts, Min S. Yun

This paper describes the Hubble Space Telescope imaging data products and data reduction procedures for the Cosmic Assembly Near-IR Deep Extragalactic Legacy Survey (CANDELS). This survey is designed to document the evolution of galaxies and black holes at $z\sim1.5-8$, and to study Type Ia SNe beyond $z>1. Read More

2010Oct
Affiliations: 1IPAC, 2US Planck Data Center, 3CEA-Saclay, 4NOAO, 5Caltech, 6Spitzer Science Center, 7CEA-Saclay, 8NRAO, 9IPAC, 10UCO/Lick Observatory, 11Texas A&M, 12UCO/Lick Observatory, 13Spitzer Science Center, 14Caltech, 15UC Berkeley, 16JPL

We present Spitzer 16 micron imaging of the Great Observatories Origins Deep Survey (GOODS) fields. We survey 150 square arcminutes in each of the two GOODS fields (North and South), to an average 3 sigma depth of 40 and 65 micro-Jy respectively. We detect about 1300 sources in both fields combined. Read More

2009Feb
Affiliations: 1Durham, 2Durham, 3Durham, 4MPIfR, 5MPIfA, 6Durham, 7MPIfA, 8MPIfR, 9ESO, 10NOAO, 11ROE, 12ROE, 13NOAO, 14UCB, 15Caltech, 16UPenn, 17IoA, Cambridge, 18MPIfA, 19Yale, 20ROE, 21IPAC, 22Rutgers, 23Durham, 24IPAC, 25Bonn, 26STScI, 27Durham, 28MPIfR, 29Texas A&M, 30MPIfA, 31MPIfA, 32Durham, 33Leiden

We report on the identification of the highest redshift submm-selected source currently known: LESSJ033229.4-275619. This source was detected in the Large Apex BOlometer CAmera (LABOCA) Extended Chandra Deep Field South (ECDFS) Submillimetre Survey (LESS), a sensitive 870-um survey (~1. Read More

We present a catalog of 59 z=4.5 Lyman alpha emitting galaxies spectroscopically confirmed in a campaign of Keck/DEIMOS follow-up observations to candidates selected in the Large Area Lyman Alpha (LALA) narrow-band imaging survey. We targeted 97 candidates for spectroscopic follow-up; by accounting for the variety of conditions under which we performed spectroscopy, we estimate a selection reliability of about 76%. Read More

We report the discovery of a new Einstein cross at redshift z_S = 2.701 based on Lyman-alpha emission in a cruciform configuration around an SDSS luminous red galaxy (z_L = 0.331). Read More

We present the discovery of three z>5 quasars in the AGN and Galaxy Evolution Survey (AGES) spectroscopic observations of the NOAO Deep Wide-Field Survey (NDWFS) Bootes Field. These quasars were selected as part of a larger Spitzer mid-infrared quasar sample with no selection based on optical colors. The highest redshift object, NDWFS J142516. Read More

We present the first results from the HST/ACS Grism Parallel Survey, a large program obtaining deep, slitless ACS grism spectroscopy of high-latitude HST parallel fields. We report on 11 high Galactic latitude fields here, each with grism integration times >12 ks. We identify 601 compact emission line galaxies at z < 1. Read More

2004Sep
Affiliations: 1UCB, 2STScI, 3STScI, 4JPL, 5NOAO, 6UCB, 7NOAO, 8U. of Science and Tech., China, 9UCB
Category: Astrophysics

We present Keck/LRIS optical spectra of 17 Lya-emitting galaxies and one Lyman break galaxy at z=4.5 discovered in the Large Area Lyman Alpha (LALA) survey. The survey has identified a sample of ~350 candidate Lya-emitting galaxies at z=4. Read More

We present a redshift z=6.535 galaxy discovered by its Lyman alpha emission in a 9180A narrowband image from the Large Area Lyman Alpha (LALA) survey. The Ly-a line luminosity (1. Read More

Hubble Space Telescope images of high-redshift galaxies selected via color and photometric redshifts are used to examine the size and axial-ratio distribution of galaxies as a function of redshift at lookback times t > 8 Gyr. These parameters are measured at rest-frame UV wavelengths (1200-2000 Angstroms) on images with a rest-frame resolution of less than 0.8 kpc. Read More

I review selected current observations of distant galaxies and our interpretation of the fragile (and occasionally contradictory) data. Galaxies at the ``contemporary limit'' of technology and redshift (z~6) are difficult to locate in the first place. Moreover, the large redshift may push some critical confirming and/or interpretative analysis toward unfamiliar IR wavelengths. Read More

2003Jun
Affiliations: 1JPL/Caltech, 2UC-Davis and IGPP/LLNL, 3UC-Davis and IGPP/LLNL, 4UC-Berkeley
Category: Astrophysics

We report the discovery of a galaxy overdensity at z=1.11 associated with the z=1.110 high-redshift radio galaxy MG0442+0202. Read More

We have discovered extended Lyman-$\alpha$ emission around a $z=4.5$ QSO in a deep long-slit spectrum with Keck/LRIS at moderate spectral resolution ($R\approx 1000$). The line emission extends 5\,arcsec beyond the continuum of the QSO and is spatially asymmetric. Read More

2003Feb

We present results of a comprehensive multi-frequency study of the radio galaxy B3 J2330+3927. The 1.9" wide radio source, consisting of 3 components, is bracketed by 2 objects in our Keck K-band image. Read More

2002Dec
Affiliations: 1UC Berkeley, 2UC Berkeley, 3JPL/Caltech, 4Caltech, 5UC Berkeley, 6IfA/Hawaii, 7UC Berkeley
Category: Astrophysics

We present optical and near-infrared Keck spectroscopy of CXOHDFN J123635.6+621424 (hereafter HDFX28), a hard X-ray source at a redshift of z = 2.011 in the flanking fields of the Hubble Deep Field-North (HDF-N). Read More

Narrow-band searches for Lyman alpha emission are an efficient way of identifying star-forming galaxies at high redshifts. We present Keck telescope spectra confirming redshifts z = 5.7 for three objects discovered in the Large Area Lyman Alpha (LALA) survey at Kitt Peak National Observatory. Read More

2002May
Affiliations: 1Institute of Astronomy, Cambridge, 2Berkeley, 3Oxford, 4KPNO/NOAO, 5Edinburgh, 6Edinburgh, 7Berkeley, 8Steward Observatory, 9Arizona State University, 10Arizona State University
Category: Astrophysics

We present high-resolution imaging in the rest-frame optical of the weak radio source LBDS53W091. Previous optical spectroscopy has shown that this object has an evolved stellar population of age >3Gyr at z=1.55, determined from the amplitude of rest-frame UV spectral breaks. Read More

2002Mar
Affiliations: 1JPL/Caltech, 2OAT, 3UC-Davis and IGPP/LLNL, 4ESO, 5UC-Davis and IGPP/LLNL, 6JPL/Caltech, 7Univ. of Florida, 8Univ. of Florida, 9Univ. of Pittsburgh, 10UC-Berkeley, 11UC-Berkeley, 12KPNO/NOAO, 13Keck Observatory
Category: Astrophysics

We present our first results on field X-ray sources detected in a deep, 184.7 ks observation with the ACIS-I camera on Chandra. The observations target the Lynx field of SPICES, and contains three known X-ray-emitting clusters out to z=1. Read More

2002Jan
Affiliations: 1UC Berkeley, 2UC Berkeley, 3NOAO, 4IGPP/LLNL, 5IGPP/LLNL, 6JPL, 7IGPP/LLNL
Category: Astrophysics

We report the serendipitous detection in high-resolution optical spectroscopy of a strong, asymmetric Ly-alpha emission line at z = 5.190. The detection was made in a 2. Read More

2001Nov
Affiliations: 1JPL/Caltech, 2UC-Berkeley, 3UC-Berkeley, 4Univ. of Pittsburgh, 5UC-Berkeley, 6UC-Berkeley, 7KPNO/NOAO, 8JPL/Caltech, 9Univ. of Florida, 10UC-Berkeley, 11Caltech, 12Columbia, 13IGPP/LLNL and UC-Davis, 14Caltech, 15ESO, 16UC-Berkeley, 17IGPP/LLNL and UC-Davis, 18Johns Hopkins and Trieste, 19Univ. of Florida
Category: Astrophysics

We report on observations of a TypeII quasar at redshift z=3.288, identified as a hard X-ray source in a 185 ks observation with the Chandra X-ray Observatory and as a high-redshift photometric candidate from deep, multiband optical imaging. CXOJ084837. Read More

(Abridged) This is the second in a series of three papers which present and interpret basic observational data on the 6C* 151-MHz radio sample: a low-frequency selected sample which exploits filtering criteria based on radio properties (steep spectral index and small angular size) to find radio sources at redshift z > 4 within a 0.133sr patch of sky. We present results of a programme of optical spectroscopy which has yielded redshifts in the range 0. Read More

2001May
Affiliations: 1UC Berkeley, 2JPL, 3Cambridge, 4UC Berkeley, 5NOAO
Category: Astrophysics

We present a catalog of 74 galaxies detected serendipitously during a campaign of spectroscopic observations of the Hubble Deep Field North (HDF) and its environs. Among the identified objects are five candidate Ly-alpha emitters at z > 5, a galaxy cluster at z = 0.85, and a Chandra source with a heretofore undetermined redshift of z = 2. Read More

We present photometric observations of an apparent Type Ia supernova (SN Ia) at a redshift of ~1.7, the farthest SN observed to date. SN 1997ff, was discovered in a repeat observation by the HST of the HDF-), and serendipitously monitored with NICMOS on HST throughout the GTO campaign. Read More

The Lyman-$\alpha$ line is expected to be strong in the presence of active star formation and the absence of dust, making it a good tool for finding chemically primitive galaxies in the early universe. We report on a new survey for high redshift Lyman-$\alpha$ sources, the Large Area Lyman Alpha (LALA) survey. Our survey achieves an unprecedented combination of volume and sensitivity by using narrow-band filters on the new $8192^2$ pixel CCD Mosaic Camera at the 4 meter Mayall telescope of Kitt Peak National Observatory. Read More

Strong Lyman-alpha emission is a signpost of young stars and the absence of dust and thus indicates young galaxies. To find such a population of young galaxies at z=4.5 we started the Large Area Lyman Alpha survey (LALA). Read More

2000Dec
Affiliations: 1JPL/Caltech, 2Univ. of Pittsburgh, 3JPL/Caltech, 4Univ. of Florida, 5UC-Davis and IGPP/LLNL, 6ESO, 7UC-Davis and IGPP/LLNL, 8UC-Berkeley, 9Trieste, 10Univ. of Florida
Category: Astrophysics

We present first results from SPICES, the Spectroscopic, Photometric, Infrared-Chosen Extragalactic Survey. SPICES is comprised of four ~30 square arcminute high Galactic latitude fields with deep BRIzJK imaging reaching depths of ~25th magnitude (AB) in the optical and ~23rd magnitude (AB) in the near-infrared. To date we have 626 spectroscopic redshifts for infrared-selected SPICES sources with K<20 (Vega). Read More

2000Dec
Affiliations: 1JPL/Caltech, 2JPL/Caltech, 3UC-Berkeley, 4UC-Berkeley, 5IGPP/LLNL, 6KPNO/NOAO, and, 7IGPP/LLNL, 8IGPP/LLNL
Category: Astrophysics

The identification of galaxies at extreme distances provides our most direct information on the earliest phases of galaxy formation. The distance implied by redshifts z > 5 makes this a challenging endeavor for even the most luminous sources; interpretation of low signal-to-noise ratio observations of faint galaxies is difficult and occasional misidentifications will occur. Here we report on STIS 123627+621755, a galaxy with a suggested spectroscopic redshift of z = 6. Read More

2000Sep
Affiliations: 1University of California, Santa Barbara, 2University of California, Santa Barbara, 3Osservatorio Astrofisico di Arcetri, 4University of California, Santa Barbara, 5National Optical Astronomy Observatories, 6Lawrence Livermore National Laboratory, 7University of California at Berkeley
Category: Astrophysics

We present the results of UV spectropolarimetry (2000 - 3000A) and far-UV spectroscopy (1500 - 2000A) of two low-redshift narrow-line radio galaxies (NLRGs) taken with the Faint Object Spectrograph onboard the Hubble Space Telescope (HST). Spectropolarimetry of several NLRGs has shown that, by the presence of broad permitted lines in polarized flux spectrum, they have hidden quasars seen through scattered light. Imaging polarimetry has shown that NLRGs including our targets often have large scattering regions of a few kpc to >~10 kpc scale. Read More

Radio galaxies characteristically have strong Lya emission lines. However, a few have Lya equivalent widths that are substantially weaker in relation to other emission lines. One in particular was studied by Dey etal (1995), MG 1019+0535 (z=2. Read More

2000Apr

In this article we investigate the morphology and stellar populations of high-redshift galaxies through multi-waveband HST imaging and ground-based spatially-resolved spectroscopy. We study the redshift evolution of galaxy morphology in the Hubble Deep Field, using the deep IDT-NICMOS near-infrared HST imaging coupled with spectroscopic and photometric redshifts. Using the multi-waveband data to compare the appearance of galaxies at the same rest-frame wavelengths reveals that "morphological k-corrections" (the change in appearance when viewing high-z objects at shorter rest-frame wavelengths) are only important in a minority of cases, and that galaxies were intrinsically more peculiar at high redshift. Read More

We report on a new survey for z=4.5 Lyman alpha sources, the Large Area Lyman Alpha (LALA) survey. Our survey achieves an unprecedented combination of volume and sensitivity by using narrow-band filters on the new 8192x8192 pixel CCD Mosaic Camera at the 4 meter Mayall telescope of Kitt Peak National Observatory. Read More

2000Feb
Affiliations: 1JPL/Caltech, 2UC-Berkeley, 3JPL/Caltech, 4IoA, Cambridge, 5UC-Berkeley, 6UC-Davis, 7Florida
Category: Astrophysics

We present observations of RD J030117+002025, a quasar at z=5.50 discovered from deep, multi-color, ground-based observations covering 74 square arcmin. This is the most distant quasar or AGN currently known. Read More

2000Feb
Affiliations: 1UC-Berkeley, 2UC-Berkeley, 3UC-Berkeley, 4KPNO/NOAO
Category: Astrophysics

We report the serendipitous discovery of two objects close in projection with fairly strong emission lines at long wavelength (~9190 A). One (A) seems not to be hosted by any galaxy brighter than V(555)=27.5, or I(814)=26. Read More

In the course of our ongoing search for serendipitous high-redshift Lyman alpha (LyA) Emissionin deep archival Keck spectra, we discovered two very high equivalent width (W_{obs} ~ 450A, 2-sigma) LyA emission line candidates at z ~3 in a moderate dispersion (R~1200) spectrogram. Both lines have low velocity dispersions (sigma_v ~ 60 km/s) and deconvolved radii r ~ 1 kpc (h = 0.5). Read More

1999Dec
Affiliations: 1UC-Berkeley, 2UC-Berkeley
Category: Astrophysics

How and when do galaxies form? Studies of the microwave background radiation reveal that the Universe is spectacularly homogenous at redshift z~1000. Observations of the local Universe reveal that by z=0 much of the luminous matter has condensed into mature, gravitationally-bound structures. One of the primary challenges to astronomers today is to achieve a robust understanding of this process of galaxy formation and evolution. Read More

In the course of our on-going search for serendipitous high-redshift LyA emission in deep archival Keck spectra, we discovered two LyA emission line candidates in a moderate dispersion ($\lambda/{\Delta \lambda} +~ 1200$) spectrogram. Both lines have high equivalent width (EW_{obs}>= 450A), low velocity dispersions ($\sigma_v ~ 60 km/s), and deconvolved effective radii $r_e ~ 1.0 h_{50}^{-1}$ kpc. Read More

1999Mar
Affiliations: 1ESO, 2LLNL/UC-DAVIS, 3JPL, 4U. of Florida, 5UC-Berkeley, 6UC-Berkeley, 7NOAO
Category: Astrophysics

We report the discovery of an X-ray luminous galaxy cluster at z=1.26. RXJ0848. Read More

1998Nov
Affiliations: 1University of California at Berkeley, 2The Johns Hopkins University, 3University of California at Berkeley, 4University of California at Berkeley, 5The Johns Hopkins University, 6Princeton University, 7Space Telescope Science Institute
Category: Astrophysics

We present optical identifications and redshifts for seventeen new high-redshift radio sources. Fifteen of these sources are radio galaxies; the remaining two are high-redshift, steep-spectrum, radio-loud quasars. These objects were discovered as part of an ongoing study of compact (theta < 10 arcsec), moderately steep spectrum (alpha(1. Read More

1998Sep
Affiliations: 1University of California at Berkeley, 2University of California at Berkeley, 3University of California at Berkeley, 4The Johns Hopkins University, 5State Univsersity of New York at Stony Brook, 6State Univsersity of New York at Stony Brook, 7State Univsersity of New York at Stony Brook, 8University of New South Wales
Category: Astrophysics

We present spectrograms of the faint V-drop (V(606) = 28.1, I(814) = 25.6) galaxy pair HDF3-951. Read More

1998Mar
Affiliations: 1JHU, 2UC Berkeley, 3UCB, 4UCB, 5WMKO
Category: Astrophysics

We report the discovery of Lyman alpha emission from a galaxy at z=5.34, the first object at z>5 with a spectroscopically confirmed redshift. The faint continuum emission (m(8000A)=27 AB mag), relatively small rest-frame equivalent width of the emission line (rest equivalent width of 95A), and limits on the NV/Lya ratio suggest that this is a star-forming galaxy and not an AGN. Read More

We present deep near-IR images of high redshift radio galaxies obtained with NIRC on the Keck I telescope. In most cases, the near-IR data sample rest wavelengths at ~4000 Angstroms, free of strong emission lines. At z > 3, the rest frame optical morphologies generally have faint, large-scale emission surrounding multiple components of ~10 kpc size. Read More

We discuss the spectral character of Lyman-limit-selected, star-forming galaxies at z>3. The rest-frame UV spectra of these faint galaxies may show Ly-alpha in either absorption or emission, probably depending upon their local ISM content and geometry. Other UV interstellar resonance absorption lines show considerable variation in strength, likely related to differences in the galactic metal abundances. Read More

1997Sep
Affiliations: 1LLNL, 2U. of Florida, 3JPL, 4UC-Berkeley, 5UC-Berkeley, 6NOAO
Category: Astrophysics

We report the discovery of a galaxy cluster at z=1.27. ClG J0848+4453 was found in a near-IR field survey as a high density region of objects with very red J-K colors. Read More

1997Feb
Affiliations: 1UC Berkeley, 2NOAO/KPNO, 3UCB, 4U Edinburgh, 5ROE, 6ROE, 7ASU
Category: Astrophysics

The weak radio source LBDS 53W091 is associated with a very faint (R approx. 24.5) red (R-K approx. Read More