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Title: Chandra Survey of Nearby Galaxies: The Catalog

Abstract

We searched the public archive of the Chandra X-ray Observatory as of 2016 March and assembled a sample of 719 galaxies within 50 Mpc with available Advanced CCD Imaging Spectrometer observations. By cross-correlation with the optical or near-infrared nuclei of these galaxies, 314 of them are identified to have an X-ray active galactic nucleus (AGN). The majority of them are low-luminosity AGNs and are unlikely X-ray binaries based upon their spatial distribution and luminosity functions. The AGN fraction is around 60% for elliptical galaxies and early-type spirals, but drops to roughly 20% for Sc and later types, consistent with previous findings in the optical. However, the X-ray survey is more powerful in finding weak AGNs, especially from regions with active star formation that may mask the optical AGN signature. For example, 31% of the H ii nuclei are found to harbor an X-ray AGN. For most objects, a single power-law model subject to interstellar absorption is adequate to fit the spectrum, and the typical photon index is found to be around 1.8. For galaxies with a non-detection, their stacked Chandra image shows an X-ray excess with a luminosity of a few times 10{sup 37} erg s{sup −1} on average aroundmore » the nuclear region, possibly composed of faint X-ray binaries. This paper reports on the technique and results of the survey; in-depth analysis and discussion of the results will be reported in forthcoming papers.« less

Authors:
;  [1];  [2]
  1. Department of Engineering Physics and Center for Astrophysics, Tsinghua University, Beijing 100084 (China)
  2. Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100087 (China)
Publication Date:
OSTI Identifier:
22663659
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 835; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ABSORPTION; CATALOGS; CHARGE-COUPLED DEVICES; CORRELATIONS; DETECTION; GALAXY NUCLEI; IMAGES; LUMINOSITY; PHOTONS; RESPIRATORS; SPATIAL DISTRIBUTION; SPECTRA; SPECTROMETERS; STARS; X RADIATION; X-RAY GALAXIES

Citation Formats

She, Rui, Feng, Hua, and Ho, Luis C. Chandra Survey of Nearby Galaxies: The Catalog. United States: N. p., 2017. Web. doi:10.3847/1538-4357/835/2/223.
She, Rui, Feng, Hua, & Ho, Luis C. Chandra Survey of Nearby Galaxies: The Catalog. United States. doi:10.3847/1538-4357/835/2/223.
She, Rui, Feng, Hua, and Ho, Luis C. Wed . "Chandra Survey of Nearby Galaxies: The Catalog". United States. doi:10.3847/1538-4357/835/2/223.
@article{osti_22663659,
title = {Chandra Survey of Nearby Galaxies: The Catalog},
author = {She, Rui and Feng, Hua and Ho, Luis C.},
abstractNote = {We searched the public archive of the Chandra X-ray Observatory as of 2016 March and assembled a sample of 719 galaxies within 50 Mpc with available Advanced CCD Imaging Spectrometer observations. By cross-correlation with the optical or near-infrared nuclei of these galaxies, 314 of them are identified to have an X-ray active galactic nucleus (AGN). The majority of them are low-luminosity AGNs and are unlikely X-ray binaries based upon their spatial distribution and luminosity functions. The AGN fraction is around 60% for elliptical galaxies and early-type spirals, but drops to roughly 20% for Sc and later types, consistent with previous findings in the optical. However, the X-ray survey is more powerful in finding weak AGNs, especially from regions with active star formation that may mask the optical AGN signature. For example, 31% of the H ii nuclei are found to harbor an X-ray AGN. For most objects, a single power-law model subject to interstellar absorption is adequate to fit the spectrum, and the typical photon index is found to be around 1.8. For galaxies with a non-detection, their stacked Chandra image shows an X-ray excess with a luminosity of a few times 10{sup 37} erg s{sup −1} on average around the nuclear region, possibly composed of faint X-ray binaries. This paper reports on the technique and results of the survey; in-depth analysis and discussion of the results will be reported in forthcoming papers.},
doi = {10.3847/1538-4357/835/2/223},
journal = {Astrophysical Journal},
number = 2,
volume = 835,
place = {United States},
year = {Wed Feb 01 00:00:00 EST 2017},
month = {Wed Feb 01 00:00:00 EST 2017}
}