T铆tulo
Unveiling the nature of INTEGRAL objects through optical spectroscopy馃焿
. VIII. Identification of 44 newly detected hard X鈥搑ay sources
Autor
VAHRAM CHAVUSHYAN
Nivel de Acceso
Acceso Abierto
Materias
Galaxies: Seyfert - (INSPEC) Quasars: emission lines - (INSPEC) X鈥搑ays: binaries - (INSPEC) Stars: novae, cataclysmic variables - (INSPEC) Techniques: spectroscopic - (INSPEC) X鈥搑ays: individuals - (INSPEC) CIENCIAS F脥SICO MATEM脕TICAS Y CIENCIAS DE LA TIERRA - (CTI) ASTRONOM脥A Y ASTROF脥SICA - (CTI) ASTRONOM脥A Y ASTROF脥SICA - (CTI)
Resumen o descripci贸n
Hard X鈥搑ay 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鈥搑ay, 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鈥搑ay bright, optically normal galaxy) with redshift 0.019 < z < 0.6058, 6 cataclysmic variables (CVs), 5 high-mass X鈥搑ay binaries (2 of which in the Small Magellanic Cloud), and 1 low-mass X鈥搑ay 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鈥搑ay sources were also determined using the multiwavelength information available in the literature. In general, AGNs are the most abundant population among hard X鈥搑ay objects, and our results confirm the tendency of finding AGNs more frequently than any other type of hard X鈥搑ay 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鈥搑ay emission above 20 keV from sources such as LINER-type AGNs and non-magnetic CVs.
Editor
Astronomy and Astrophysics
Fecha de publicaci贸n
junio de 2010
Tipo de publicaci贸n
Art铆culo
Versi贸n de la publicaci贸n
Versi贸n aceptada
Recurso de informaci贸n
Formato
application/pdf
Idioma
Ingl茅s
Relaci贸n
. III. Identification of 44 newly detected hard X鈥搑ay sources, Astronomy and Astrophysics. Vol. 519:1-22
Audiencia
Estudiantes
Investigadores
P煤blico en general
Sugerencia de citaci贸n
Masetti, N., et al., (2010). Unveiling the nature of INTEGRAL objects through optical spectroscopy馃焿
Repositorio Or铆gen
Repositorio Institucional del INAOE
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