Advanced search    

Search: authors:"E. Palazzi"

43 papers found.
Use AND, OR, NOT, +word, -word, "long phrase", (parentheses) to fine-tune your search.

Optical polarimetry, high–resolution spectroscopy and IR analysis of the Chamaeleon I dark cloud

We present optical polarimetry and high resolution spectroscopy of a sample of stars toward the Chamaeleon I dark cloud. We use our polarimetry which includes 33 stars to study the wavelength dependence of the degree and position angle of polarization.
From fits to the normalized wavelength dependence of interstellar polarization, we derive estimates of ranging from 4500 Å to...

The high energy instrument PDS on-board the BeppoSAX X–ray astronomy satellite

BeppoSAX/PDS experiment is one of four narrow field instruments of the BeppoSAX payload, that also includes two wide field cameras. The goal of PDS is to extend the energy range of BeppoSAX to hard X–rays. The operative energy range of PDS is 15 to 300 keV, where the experiment can perform sensitive spectral and temporal studies of celestial sources. The PDS detector is composed...

The nature of 50 Palermo Swift-BAT hard X-ray objects through optical spectroscopy

We present the nature of 50 hard X-ray emitting objects unveiled through an optical spectroscopy campaign performed at seven telescopes in the northern and southern hemispheres. These objects were detected with the Burst Alert Telescope (BAT) instrument onboard the Swift satellite and listed as of unidentified nature in the 54-month Palermo BAT catalogue. In detail, 45 sources in...

Identifying the host galaxy of the short GRB 100628A

A&A Astronomy & Astrophysics A. Nicuesa Guelbenzu 8 S. Klose 8 E. Palazzi 7 J. Greiner 6 M. J. Michałowski 13 D. A. Kann 8 L. K. Hunt 12 D. Malesani 11 A. Rossi 7 8 S. Savaglio 10 S. Schulze 14 15 D

GRB hosts through cosmic time - VLT/X-Shooter emission-line spectroscopy of 96 γ-ray-burst-selected galaxies at 0.1 <z < 3.6

. Milvang-Jensen A. Nicuesa Guelbenzu E. Palazzi E. Pian S. Piranomonte R. Sánchez-Ramírez S. Savaglio J. Selsing G. Tagliaferri P. M. Vreeswijk D. J. Watson D. Xu We present data and initial results from

A quiescent galaxy at the position of the long GRB 050219A

A&A Astronomy & Astrophysics A. Rossi 15 16 S. Piranomonte 13 S. Savaglio 19 20 21 E. Palazzi 16 M. J. Michałowski 18 S. Klose 15 L. K. Hunt 23 L. Amati 16 J. Elliott 21 J. Greiner 21 C. Guidorzi

A quiescent galaxy at the position of the long GRB 050219A

A&A Astronomy & Astrophysics A. Rossi 15 16 S. Piranomonte 13 S. Savaglio 19 20 21 E. Palazzi 16 M. J. Michałowski 18 S. Klose 15 L. K. Hunt 23 L. Amati 16 J. Elliott 21 J. Greiner 21 C. Guidorzi

Accurate classification of 29 objects detected in the 39 month Palermo Swift/BAT hard X-ray catalogue

Through an optical campaign performed at four telescopes located in the northern and the southern hemispheres, plus archival data from two on-line sky surveys, we obtained optical spectroscopy for 29 counterparts of unclassified or poorly studied hard X-ray emitting objects detected with Swift /Burst Alert Telescope (BAT) and listed in the 39 month Palermo catalogue. All these...

Diversity of gamma-ray burst energetics vs. supernova homogeneity: SN 2013cq associated with GRB 130427A

. Bersier 15 F. Bufano 5 S. Campana A. J. Castro-Tirado 6 S. Covino G. Ghirlanda K. Hurley 2 D. Malesani 4 N. Masetti E. Palazzi S. Piranomonte A. Rossi 0 R. Salvaterra R. L. C. Starling 11 M. Tanaka 1 N. R

Unveiling the nature of INTEGRAL objects through optical spectroscopy - X. A new multi-year, multi-observatory campaign

Within the framework of our program (running since 2004) of identification of hard X-ray INTEGRAL sources through optical spectroscopy, we present the results concerning the nature of 33 high-energy objects. The data were acquired with the use of six telescopes of different sizes and from one on-line archive. The results indicate that the majority of these objects (23 out of 33...

Unveiling the nature of INTEGRAL objects through optical spectroscopy - IX. Twenty two more identifications, and a glance into the far hard X-ray Universe

Since its launch in October 2002, the INTEGRAL satellite has revolutionized our knowledge of the hard X-ray sky thanks to its unprecedented imaging capabilities and source detection positional accuracy above 20 keV. Nevertheless, many of the newly-detected sources in the INTEGRAL sky surveys are of unknown nature. The combined use of available information at longer wavelengths...

Testing gamma-ray burst models with the afterglow of GRB 090102*

We present the observations of the afterglow of gamma-ray burst GRB 090102. Optical data taken by the Telescope a Action Rapide pour les Objets Transitoires (TAROT), Rapid Eye Mount (REM), Gamma-Ray burst Optical/Near-Infrared Detector (GROND), together with publicly available data from Palomar, Instituto de Astrofísica de Canarias (IAC) and Nordic Optical Telescope (NOT...

Searching for active galactic nuclei among unidentified INTEGRAL sources

We report on a new method to identify active galactic nuclei (AGNs) among unidentified INTEGRAL sources. This method consists of cross-correlating unidentified sources listed in the fourth Imager on Board the INTEGRAL Satellite (IBIS) Survey Catalogue first with infrared and then with radio catalogues and a posteriori verifying, by means of X-ray and optical follow-up...

GRB 100219A with X-shooter – abundances in a galaxy at z =4.7

8 12 17 L. Kaper 16 N. Tanvir 11 T. Zafar 6 V. D'Elia 4 7 J. Gorosabel 10 J. Greiner 12 P. Groot 5 F. Hammer 13 P. Jakobsson 2 S. Klose 3 A. J. Levan 0 B. Milvang-Jensen 8 A. Nicuesa Guelbenzu 3 E ... . Palazzi 1 S. Piranomonte 7 G. Tagliaferri 14 D. Watson 8 K. Wiersema 11 R. A. M. J. Wijers 16 0 Department of Physics, University of Warwick , Coventry, CV4 7AL 1 INAF, IASF di Bologna , via Gobetti 101, I

The origin of the early-time optical emission of Swift GRB 080310*

We present broad-band multiwavelength observations of GRB 080310 at redshift z= 2.43. This burst was bright and long-lived, and unusual in having extensive optical and near-infrared (IR) follow-up during the prompt phase. Using these data we attempt to simultaneously model the gamma-ray, X-ray, optical and IR emission using a series of prompt pulses and an afterglow component...

Unveiling the nature of INTEGRAL objects through optical spectroscopy - IV. A study of six new hard X-ray sources

We present further results from our onging optical spectrophotometric campaign at the Astronomical Observatory of Bologna in Loiano (Italy) on unidentified hard X-ray sources detected by INTEGRAL. We observed spectroscopically the putative optical counterparts of the INTEGRAL sources IGR J00234+6141, IGR J01583+6713, IGR J06074+2205, IGR J13091+1137 and IGR J20286+2544. We find...

GRB 091127/SN 2009nz and the VLT/X-shooter spectroscopy of its host galaxy: probing the faint end of the mass-metallicity relation

V. D'Elia 15 16 M. Fernández 14 J. P. U. Fynbo 11 G. Ghirlanda 9 M. Jelínek 14 A. Lundgren 5 10 D. Malesani 11 E. Palazzi 6 S. Piranomonte 16 M. Rodrigues 10 R. Sánchez-Ramírez 14 V. Terrón 14 C. C

Unveiling the nature of INTEGRAL objects through optical spectroscopy - V. Identification and properties of 21 southern hard X-ray sources

Optical spectroscopic identification of the nature of 21 unidentified southern hard X-ray objects is reported here in the framework of our campaign aimed at determining the nature of newly-discovered and/or unidentified sources detected by INTEGRAL. Our results show that 5 of these objects are magnetic Cataclysmic Variables (CVs), 4 are High-Mass X-ray Binaries (HMXBs; one of...

GRB 090313: X-shooter's first shot at a gamma-ray burst

Context. X-shooter is the first second-generation instrument to become operative at the ESO Very Large Telescope (VLT). It is a broad-band medium-resolution spectrograph designed with gamma-ray burst (GRB) afterglow spectroscopy as one of its main science drivers.Aims. During the first commissioning night on sky with the instrument fully assembled, X-shooter observed the...

BeppoSAX observations of two unclassified LMXBs: X1543–624 and X1556–605

Observations of two unclassified Low Mass X–ray Binaries, X1543–624 and X1556–605, are presented. In the 2–10 keV band the first of the two sources is a factor of two stronger than the other. Both sources do not show X–ray bursts, dips or eclipses in their X–ray light curves. We find that both spectra are described by a two–component model consisting of emission from a cool...