Unveiling the nature of INTEGRAL objects through optical spectroscopy ⋆ : IX. Twenty two more identifications, and a glance into the far hard X-ray Universe

dc.creatorVahram Chavushyan
dc.date2012-02
dc.date.accessioned2023-07-25T16:24:37Z
dc.date.available2023-07-25T16:24:37Z
dc.identifierhttp://inaoe.repositorioinstitucional.mx/jspui/handle/1009/1935
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7807126
dc.descriptionSince 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.
dc.formatapplication/pdf
dc.languageeng
dc.publisherAstronomy & Astrophysics
dc.relationcitation: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 & Astrophysics, Vol. 538(A123):1-17
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0
dc.subjectinfo:eu-repo/classification/Inspec/X-rays: binaries
dc.subjectinfo:eu-repo/classification/Inspec/Galaxies: Seyfert
dc.subjectinfo:eu-repo/classification/Inspec/X-rays: general
dc.subjectinfo:eu-repo/classification/Inspec/Novae, cataclysmic variables
dc.subjectinfo:eu-repo/classification/Inspec/Quasars: emission lines
dc.subjectinfo:eu-repo/classification/Inspec/Stars: flare
dc.subjectinfo:eu-repo/classification/cti/1
dc.subjectinfo:eu-repo/classification/cti/21
dc.subjectinfo:eu-repo/classification/cti/21
dc.titleUnveiling the nature of INTEGRAL objects through optical spectroscopy ⋆ : IX. Twenty two more identifications, and a glance into the far hard X-ray Universe
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:eu-repo/semantics/acceptedVersion
dc.audiencestudents
dc.audienceresearchers
dc.audiencegeneralPublic


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