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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Unveiling the nature of INTEGRAL objects through optical spectroscopy: VII. Identification of 20 Galactic and extragalactic hard X-ray sources
Astronomy and Astrophysics, Volume 495, No. 1, Year 2009
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Description
Within the framework of our program of assessment of the nature of unidentified or poorly known INTEGRAL sources, we present here spectroscopy of optical objects, selected through positional cross-correlation with soft X-ray detections (afforded with satellites such as Swift, ROSAT, Chandra and/or XMM-Newton) as putative counterparts of hard X-ray sources detected with the IBIS instrument onboard INTEGRAL. Using 6 telescopes of various sizes and archival data from two on-line spectroscopic surveys we are able to identify, either for the first time or independent of other groups, the nature of 20 INTEGRAL hard X-ray sources. Our results indicate that: 11 of these objects are active galactic nuclei (AGNs) at redshifts between 0.014 and 0.978, 7 of which display broad emission lines, 2 show narrow emission lines only, and 2 have unremarkable or no emission lines (thus are likely Compton thick AGNs); 5 are cataclysmic variables (CVs), 4 of which are (possibly magnetic) dwarf novae and one is a symbiotic star; and 4 are Galactic X-ray binaries (3 with high-mass companions and one with a low-mass secondary). It is thus again found that the majority of these sources are AGNs or magnetic CVs, confirming our previous findings. When possible, the main physical parameters for these hard X-ray sources are also computed using the multiwavelength information available in the literature. These identifications support the importance of INTEGRAL in the study of the hard X-ray spectrum of all classes of X-ray emitting objects, and the effectiveness of a strategy of multi-catalogue cross-correlation plus optical spectroscopy to securely pinpoint the actual nature of unidentified hard X-ray sources. © 2009 ESO.
Authors & Co-Authors
Masetti, Nicola
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Parisi, Pietro
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Italy, Bologna
Alma Mater Studiorum Università Di Bologna
Palazzi, Eliana
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Jiménez-Bailón, Elena
Mexico, Mexico
Universidad Nacional Autónoma de México
Morelli, Lorenzo
Italy, Padua
Università Degli Studi Di Padova
Chavushyan, Vahram H.
Mexico, Puebla
Instituto Nacional de Astrofisica Optica y Electronica
Mason, Elena
Chile, Santiago
European Southern Observatory Santiago
McBride, Vanessa A.
United Kingdom, Southampton
University of Southampton
Bassani, Loredana
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Bazzano, Angela
Italy, Rome
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Rome
Bird, Antony J.
United Kingdom, Southampton
University of Southampton
Dean, Anthony J.
United Kingdom, Southampton
University of Southampton
Galaz, Gaspar
Chile, Santiago
Pontificia Universidad Católica de Chile
Gehrels, Neil C.
United States, Greenbelt
Nasa Goddard Space Flight Center
Landi, Raffaella
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Malizia, Angela
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Minniti, Dante
Chile, Santiago
Pontificia Universidad Católica de Chile
Italy, Rome
Vatican Observatory
Schiavone, Filomena
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Stephen, John Buchan
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Ubertini, Pietro
Italy, Rome
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Rome
Statistics
Citations: 74
Authors: 20
Affiliations: 11
Identifiers
Doi:
10.1051/0004-6361:200811322
ISSN:
00046361
Research Areas
Environmental
Study Design
Cross Sectional Study