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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 VI. A multi-observatory identification campaign
Astronomy and Astrophysics, Volume 482, No. 1, Year 2008
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Description
Using 8 telescopes in the northern and southern hemispheres, plus archival data from two on-line sky surveys, we performed a systematic optical spectroscopic study of 39 putative counterparts of unidentified or poorly studied INTEGRAL sources in order to determine or at least better assess their nature. This was implemented within the framework of our campaign to reveal the nature of newly-discovered and/or unidentified sources detected by INTEGRAL. Our results show that 29 of these objects are active galactic nuclei (13 of which are of Seyfert 1 type, 15 are Seyfert 2 galaxies and one is possibly a BL Lac object) with redshifts between 0.011 and 0.316, 7 are X-ray binaries (5 with high-mass companions and 2 with low-mass secondaries), one is a magnetic cataclysmic variable, one is a symbiotic star and one is possibly an active star. Thus, the large majority (74%) of the identifications in this sample belongs to the AGN class. When possible, the main physical parameters for these hard X-ray sources were also computed using the multiwavelength information available in the literature. These identifications further underscore the importance of INTEGRAL in studying the hard X-ray spectra 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 still unidentified hard X-ray sources. © 2008 ESO.
Authors & Co-Authors
Masetti, Nicola
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
Mason, Elena
Chile, Santiago
European Southern Observatory Santiago
Morelli, Lorenzo
Italy, Padua
Università Degli Studi Di Padova
Cellone, Sergio A.
Argentina, La Plata
Universidad Nacional de la Plata
Argentina
Ialp Conicet-unlp
McBride, Vanessa A.
United Kingdom, Southampton
University of Southampton
Palazzi, Eliana
Italy, Bologna
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Bologna
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
Charles, Philip A.
United Kingdom, Southampton
University of Southampton
South Africa, Cape Town
South African Astronomical Observatory
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
Panessa, Francesca
Italy, Rome
Inaf Istituto Di Astrofisica Spaziale e Fisica Cosmica, Rome
Romero, Gustavo E.
Argentina, La Plata
Universidad Nacional de la Plata
Argentina, Berazategui
Instituto Argentino de Radioastronomia
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
Walter, Roland
Switzerland, Geneva
Université de Genève
Statistics
Citations: 96
Authors: 21
Affiliations: 12
Identifiers
Doi:
10.1051/0004-6361:20079332
ISSN:
00046361
e-ISSN:
14320746
Study Design
Cross Sectional Study