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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: VIII. Identification of 44 newly detected hard x-ray sources
Astronomy and Astrophysics, Volume 519, No. 10, Article A96, Year 2010
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Description
Hard X-ray surveys performed by the INTEGRAL satellite have discovered a conspicuous fraction (up to 30%) of unidentified objects among the detected sources. Here we continue our program of identification of these objects by (i) selecting probable optical candidates by means of positional cross-correlation of the INTEGRAL detections with soft X-ray, radio, and/or optical archives and (ii) performing optical spectroscopy on them. As a result, we pinpointed and identified, or more accurately characterized, 44 definite or likely counterparts of INTEGRAL sources. Among them, 32 are active galactic nuclei (AGNs; 18 with broad emission lines, 13 with narrow emission lines only, and one X-ray bright, optically normal galaxy) with redshift 0.019 < z < 0.6058, 6 cataclysmic variables (CVs), 5 high-mass X-ray binaries (2 of which in the Small Magellanic Cloud), and 1 low-mass X-ray binary. This was achieved by using 7 telescopes of various sizes and archival data from two online spectroscopic surveys. The main physical parameters of these hard X-ray sources were also determined using the multiwavelength information available in the literature. In general, AGNs are the most abundant population among hard X-ray objects, and our results confirm the tendency of finding AGNs more frequently than any other type of hard X-ray emitting object among unidentified INTEGRAL sources when optical spectroscopy is used as an identification tool. Moreover, the deeper sensitivity of the more recent INTEGRAL surveys enables one to begin detecting hard X-ray emission above 20 keV from sources such as LINER-type AGNs and non-magnetic CVs. © 2010 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
Chavushyan, Vahram H.
Mexico, Puebla
Instituto Nacional de Astrofisica Optica y Electronica
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
Charles, Philip A.
United Kingdom, Southampton
University of Southampton
South Africa, Cape Town
South African Astronomical Observatory
Galaz, Gaspar
Chile, Santiago
Pontificia Universidad Católica de Chile
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
Mason, Elena
Chile, Santiago
European Southern Observatory Santiago
McBride, Vanessa A.
United Kingdom, Southampton
University of Southampton
Minniti, Dante
Chile, Santiago
Pontificia Universidad Católica de Chile
Italy, Rome
Vatican Observatory
Morelli, Lorenzo
Italy, Padua
Università Degli Studi Di Padova
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: 20
Authors: 20
Affiliations: 11
Identifiers
Doi:
10.1051/0004-6361/201014852
ISSN:
00046361
e-ISSN:
14320746
Research Areas
Environmental
Study Design
Cross Sectional Study