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

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

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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307

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