Discovery of nuclear x-ray sources in Sings Galaxies

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DOIResolve DOI: http://doi.org/10.1088/0004-637X/731/1/60
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TypeArticle
Journal titleThe Astrophysical Journal
ISSN0004-637X
Volume731
Issue1
Article number60
Pages60-1
Subjectgalaxies: active; galaxies: nuclei; X-rays: galaxies
AbstractWe present the results of a search for nuclear X-ray activity in nearby galaxies using Chandra archival data in a sample of 62 galaxies from the Spitzer Infrared Nearby Galaxy Survey. We detect 37 nuclear X-ray sources; seven of these are new detections. Most of the nuclear X-ray sources are likely to be active galactic nuclei (AGNs). The fraction of galaxies hosting AGNs is thus about 60%, much higher than that found with optical searches, and demonstrates the efficacy of X-ray observations to find hidden AGNs in optically normal galaxies. We find that the nuclear X-ray sources are preferentially present in earlier type galaxies. Unlike what is observed at high redshift for high-luminosity AGNs, we do not find a strong correlation between the AGN luminosity and the 24 mu m luminosity of the host galaxy; we find a strong correlation with the 3.6 mu m luminosity instead. This suggests that at the present epoch, the accretion rate depends on the total mass of the galaxy, as perhaps does the black hole mass.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Herzberg Institute of Astrophysics
Peer reviewedYes
NPARC number19775306
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Record identifier8a7ca95c-125f-491f-8705-9d14e500ce2b
Record created2012-04-05
Record modified2016-07-18
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