Nicola Masetti - INAF/IASF Bologna

Nicola Masetti
Are you Nicola Masetti?

Claim your profile, edit publications, add additional information:

Contact Details

Nicola Masetti

Pubs By Year

Pub Categories

Astrophysics (13)
High Energy Astrophysical Phenomena (4)
Astrophysics of Galaxies (3)
Instrumentation and Methods for Astrophysics (1)

Publications Authored By Nicola Masetti

We present the results of our analysis of new optical, ultraviolet (UV) and X-ray observations of a highly variable source $-$ AX J1549.8$-$5416. Both the detection of several fast rise, exponential decay outbursts in the optical light curve and the lack of He II emission lines in the optical spectra suggest AX J1549. Read More

We investigate the observed relationship between black hole mass ($M_{\rm BH}$), bolometric luminosity ($L_{\rm bol}$), and Eddington ratio (${\lambda}_{\rm Edd}$) with optical emission line ratios ([NII] {\lambda}6583/H{\alpha}, [SII] {\lambda}{\lambda}6716,6731/H{\alpha}, [OI] {\lambda}6300/H{\alpha}, [OIII] {\lambda}5007/H{\beta}, [NeIII] {\lambda}3869/H{\beta}, and HeII {\lambda}4686/H{\beta}) of hard X-ray-selected AGN from the BAT AGN Spectroscopic Survey (BASS). We show that the [NII] {\lambda}6583/H{\alpha} ratio exhibits a significant correlation with ${\lambda}_{\rm Edd}$ ($R_{\rm Pear}$ = -0.44, $p$-value=$3\times10^{-13}$, {\sigma} = 0. Read More

Authors: Maren Hempel, Dante Minniti, István Dékány, Roberto K. Saito, Philip W. Lucas, Jim Emerson, Andrea V. Ahumada, Suzanne Aigrain, Maria Victoria Alonso, Javier Alonso-García, Eduardo B. Amôres, Rodolfo Angeloni, Julia Arias, Reba Bandyopadhyay, Rodolfo H. Barbá, Beatriz Barbuy, Gustavo Baume, Juan Carlos Beamin, Luigi Bedin, Eduardo Bica, Jordanka Borissova, Leonardo Bronfman, Giovanni Carraro, Márcio Catelan, Juan J. Clariá, Carlos Contreras, Nicholas Cross, Christopher Davis, Richard de Grijs, Janet E. Drew, Cecilia Fariña, Carlos Feinstein, Eduardo Fernández Lajús, Stuart Folkes, Roberto C. Gamen, Douglas Geisler, Wolfgang Gieren, Bertrand Goldman, Oscar González, Andrew Gosling, Guillermo Gunthardt, Sebastian Gurovich, Nigel C. Hambly, Margaret Hanson, Melvin Hoare, Mike J. Irwin, Valentin D. Ivanov, Andrés Jordán, Eamonn Kerins, Karen Kinemuchi, Radostin Kurtev, Andy Longmore, Martin López-Corredoira, Tom Maccarone, Eduardo Martín, Nicola Masetti, Ronald E. Mennickent, David Merlo, Maria Messineo, I. Félix Mirabel, Lorenzo Monaco, Christian Moni Bidin, Lorenzo Morelli, Nelson Padilla, Tali Palma, Maria Celeste Parisi, Quentin Parker, Daniela Pavani, Pawel Pietrukowicz, Grzegorz Pietrzynski, Giuliano Pignata, Marina Rejkuba, Alejandra Rojas, Alexandre Roman-Lopes, Maria Teresa Ruiz, Stuart E. Sale, Ivo Saviane, Matthias R. Schreiber, Anja C. Schröder, Saurabh Sharma, Michael Smith, Laerte Sodré Jr., Mario Soto, Andrew W. Stephens, Motohide Tamura, Claus Tappert, Mark A. Thompson, Ignacio Toledo, Elena Valenti, Leonardo Vanzi, Walter Weidmann, Manuela Zoccali

The VISTA Variables in the V\'ia L\'actea (VVV) survey is one of six public ESO surveys, and is now in its 4th year of observing. Although far from being complete, the VVV survey has already delivered many results, some directly connected to the intended science goals (detection of variables stars, microlensing events, new star clusters), others concerning more exotic objects, e.g. Read More

We present the spectroscopic and photometric evolution of the nearby (z = 0.059) spectroscopically confirmed type Ic supernova, SN 2010bh, associated with the soft, long-duration gamma-ray burst (X-ray flash) GRB 100316D. Intensive follow-up observations of SN 2010bh were performed at the ESO Very Large Telescope (VLT) using the X-shooter and FORS2 instruments. Read More

Affiliations: 1INAF/IASF Bologna, 2Physics Dept, Ferrara Un, 3INAF/IASF Bologna, 4INAF/IASF Bologna, 5INAF/IASF Milano

The transient 500 s X-ray pulsar MAXI J1409-619 was discovered by the slit cameras aboard MAXI on October 17, 2010, and soon after accurately localized by Swift. We found that the source position was serendipitously observed in 2000 during BeppoSAX observations of the Galactic plane. Two sources are clearly detected in the MECS: one is consistent with the position of IGR J14043-6148 and the other one with that of MAXI J1409-619. Read More

Affiliations: 1TIFR, India, 2INAF & Universita di Bologna, Italy, 3TIFR, India, 4INAF, Bologna, Italy, 5MPE & Technische Universitaet Muenchen, Garching, Germany, 6MPE Garching, Germany

We present results of observations in the optical to mid-infrared wavelengths of the X-ray source CXO J172337.5-373442, which was serendipitously discovered in the Chandra images and was found to have a fully resolved X-ray jet. The observations include a combination of photometry and spectroscopy in the optical using ground-based telescopes and mid-infrared photometry using Spitzer. Read More

The only supernovae (SNe) to have shown early gamma-ray or X-ray emission thus far are overenergetic, broad-lined Type Ic SNe (Hypernovae - HNe). Recently, SN 2008D shows several novel features: (i) weak XRF, (ii) an early, narrow optical peak, (iii) disappearance of the broad lines typical of SNIc HNe, (iv) development of He lines as in SNeIb. Detailed analysis shows that SN 2008D was not a normal SN: its explosion energy (KE ~ 6*10^{51} erg) and ejected mass (~7 Msun) are intermediate between normal SNeIbc and HNe. Read More

The long and relatively faint gamma-ray burst GRB 060605 detected by \emph{Swift}/BAT lasted about 20 sec. Its afterglow could be observed with \emph{Swift}/XRT for nearly 1 day, while \emph{Swift}/UVOT could detect the afterglow during the first 6 hours after the event. Here, we report on integral field spectroscopy of its afterglow performed with PMAS/PPak mounted at the Calar Alto 3. Read More

Affiliations: 1INAF/IASF Bologna, 2INAF/IASF Bologna, 3INAF/IASF Bologna, 4INAF/OA Bologna, 5INAF/OA Roma, 6Uni Bologna, 7INAF/IASF Bologna, 8INAF/IASF Roma, 9INAF/IASF Bologna, 10INAF/IASF Bologna
Category: Astrophysics

We report on an accurate measurement of the CXB in the 15-50 keV range performed with the Phoswich Detection System (PDS) instrument aboard the BeppoSAX satellite. We establish that the most likely CXB intensity level at its emission peak (26-28 keV) is ~40 keV/cm2/s/sr, a value consistent with that derived from the best available CXB measurement obtained over 25 years ago with the first High Energy Astronomical Observatory satellite mission (HEAO-1; Gruber et al. 1999), whose intensity, lying well below the extrapolation of some lower energy measurements performed with focusing telescopes, was questioned in the recent years. Read More

We present near-infrared (nIR) and optical observations of the afterglow of GRB 030115. Discovered in an infrared search at Kitt Peak 5 hours after the burst trigger, this afterglow is amongst the faintest observed in the R-band at an early epoch, and exhibits very red colors, with $R-K\approx 6$. The magnitude of the optical afterglow of GRB 030115 is fainter than many upper limits for other bursts, suggesting that without early nIR observations it would have been classified as a ``dark'' burst. Read More


Since its launch on October 2002 the INTEGRAL satellite is performing an deep survey of the hard X-ray sky with unprecedented sensitivity and positional accuracy. This allowed pinpointing, through positional cross-correlation with catalogs at longer wavelengths, possible optical/near-infrared candidates for the hard X-ray sources of still unknown nature. In this presentation I will describe this work as well as the observational activities aimed at determining, through optical spectroscopy, the nature of the unknown INTEGRAL sources, along with the main results of this search. Read More

We report the discovery of a Narrow Line QSO located at about 1.3' from the Broad Line Radio Galaxy 3C445. The source,1WGA J2223. Read More

Over the past five years evidence has mounted that long-duration (> 2 s) gamma-ray bursts (GRBs)--the most brilliant of all astronomical explosions--signal the collapse of massive stars in our Universe. This evidence was originally based on the probable association of one unusual GRB with a supernova, but now includes the association of GRBs with regions of massive star formation in distant galaxies, the appearance of supernova-like 'bumps' in the optical afterglow light curves of several bursts and lines of freshly synthesized elements in the spectra of a few X-ray afterglows. These observations support, but do not yet conclusively demonstrate, the idea that long-duration GRBs are associated with the deaths of massive stars, presumably arising from core collapse. Read More

Authors: Nicola Masetti1
Affiliations: 1on behalf of the GRACE - Gamma-Ray Afterglow Collaboration at ESO
Category: Astrophysics

In October 1997, the Italian and Dutch GRB teams started a collaboration on ESO optical follow-up of rapidly and accurately localized GRBs. Subsequently, starting April 1, 2000, this collaboration was extended to astronomers from other countries, who contributed their expertise for the creation of a Consortium committed to the study of GRB counterparts and host galaxies at optical and near-infrared wavelengths. The collaboration aims at the joint exploitation of the observations taken within an ESO Large Programme approved for the two-year period April 1, 2000 - March 31, 2002. Read More

Authors: Nicola Masetti1
Affiliations: 1Istituto TeSRE/CNR, Bologna, Italy
Category: Astrophysics

An apparent sudden change in the outburst recurrence time displayed by the Rapid Burster occurred around the end of 1999. The time between consecutive outbursts shrinked from ~200 to ~100 days somewhere between November 1999 and March 2000. In parallel, the average peak intensity also decreased of a factor about 2 in all outbursts occurred after November 1999 with respect to those occurred before this date. Read More

We present and discuss the photometric and spectroscopic evolution of the peculiar SN1998bw, associated with GRB980425, through an analysis of optical and near IR data collected at ESO-La Silla. The spectroscopic data, spanning the period from day -9 to day +376 (relative to B maximum), have shown that this SN was unprecedented, although somewhat similar to SN1997ef. Maximum expansion velocities as high as 3x10^4 km/s to some extent mask its resemblance to other Type Ic SNe. Read More

We compare the prompt X-ray (2-10 keV) emission of GRB990510 measured by the BeppoSAX Wide Field Cameras (WFC) during the burst to the X-ray afterglow detected by the BeppoSAX Narrow Field Instruments. A single power-law model for the afterglow, f(t) ~ t^{-1.42}, is ruled out. Read More

Affiliations: 1TeSRE/CNR, 2TeSRE/CNR and Universita' di Ferrara, 3TeSRE/CNR, 4TeSRE/CNR, 5TeSRE/CNR, 6IFCAI/CNR, 7IFCAI/CNR, 8IFCAI/CNR, 9ESA/SSD, 10ESA/SSD
Category: Astrophysics

The systematic search for the presence of cyclotron lines in the spectra of accreting X-ray pulsars is being carried on with the BeppoSAX satellite since the beginning of the mission. These highly successful observations allowed the detection of cyclotron lines in many of the accreting X-ray pulsars observed. Some correlations between the different measured parameters were found. Read More

Affiliations: 1Dipartimento di Astronomia, Universita` di Bologna, via Zamboni, Italy;, 2Dipartimento di Astronomia, Universita` di Padova, Italy
Category: Astrophysics

We have performed a Discrete Fourier Transform on 136 CCD B, V and R frames of the Z Cam-type dwarf nova V1101 Aql. Our analysis indicates as possible orbital period P_orb =3.46 hours, though we cannot exclude the alias at 4. Read More