Título
Unveiling the nature of INTEGRAL objects through optical spectroscopy ⋆ : IX. Twenty two more identifications, and a glance into the far hard X-ray Universe
Autor
Vahram Chavushyan
Nivel de Acceso
Acceso Abierto
Materias
X-rays: binaries - (INSPEC) Galaxies: Seyfert - (INSPEC) X-rays: general - (INSPEC) Novae, cataclysmic variables - (INSPEC) Quasars: emission lines - (INSPEC) Stars: flare - (INSPEC) CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA - (CTI) ASTRONOMÍA Y ASTROFÍSICA - (CTI) ASTRONOMÍA Y ASTROFÍSICA - (CTI)
Resumen o descripción
Since its launch in October 2002, the INTEGRAL satellite has revolutionized our knowledge of the hard X-ray sky thanks to its unprecedented imaging capabilities and source detection positional accuracy above 20 keV. Nevertheless, many of the newly-detected sources in the INTEGRAL sky surveys are of unknown nature. The combined use of available information at longer wavelengths (mainly soft X-rays and radio) and of optical spectroscopy on the putative counterparts of these new hard X-ray objects allows us to pinpoint their exact nature. Continuing our long-standing program that has been running since 2004, and using 6 different telescopes of various sizes together with data from an online spectroscopic survey, here we report the classification through optical spectroscopy of 22 more unidentified or poorly studied high-energy sources detected with the IBIS instrument onboard INTEGRAL.We found that 16 of them are active galactic nuclei (AGNs), while the remaining 6 objects are within our Galaxy. Among the identified extragalactic sources, the large majority (14) is made up of type 1 AGNs (i.e. with broad emission lines); of these, 6 lie at redshift larger than 0.5 and one (IGR J12319−0749) has z = 3.12, which makes it the second farthest object detected in the INTEGRAL surveys up to now. The remaining AGNs are of type 2 (that is, with narrow emission lines only), and one of the two cases is confirmed as a pair of interacting Seyfert 2 galaxies. The Galactic objects are identified as two cataclysmic variables, one high-mass X-ray binary, one symbiotic binary and two chromospherically active stars, possibly of RS CVn type. The main physical parameters of these hard X-ray sources were also determined using the multiwavelength information available in the literature. We thus still find that AGNs are the most abundant population among hard X-ray objects identified through optical spectroscopy. Moreover, we note that the higher sensitivity of the more recent INTEGRAL surveys is now enabling the detection of high-redshift AGNs, thus allowing the exploration of the most distant hard X-ray emitting sources and possibly of the most extreme blazars.
Editor
Astronomy
&
Astrophysics
Fecha de publicación
febrero de 2012
Tipo de publicación
Artículo
Versión de la publicación
Versión aceptada
Recurso de información
Formato
application/pdf
Idioma
Inglés
Relación
&
Astrophysics, Vol. 538(A123):1-17
Audiencia
Estudiantes
Investigadores
Público en general
Sugerencia de citación
Masetti, N., et al., (2012), Unveiling the nature of INTEGRAL objects through optical spectroscopy ⋆ : IX. Twenty two more identifications, and a glance into the far hard X-ray Universe, Astronomy
Repositorio Orígen
Repositorio Institucional del INAOE
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