Deep Chandra observations of NGC 4649. I. Virtual Observatory Resource

Authors
  1. Luo B.
  2. Fabbiano G.
  3. Strader J.
  4. Kim D.-W.
  5. Brodie J.P.
  6. Fragos T.,Gallagher J.S.
  7. King A.
  8. Zezas A.
  9. Published by
    CDS
Abstract

We present the X-ray source catalog for the Chandra monitoring observations of the elliptical galaxy, NGC 4649 (M60). The galaxy has been observed with Chandra ACIS-S3 in six separate pointings, reaching a total exposure of 299ks. There are 501 X-ray sources detected in the 0.3-8.0keV band in the merged observation or in one of the six individual observations; 399 sources are located within the D_25_ ellipse. The observed 0.3-8.0keV luminosities of these 501 sources range from 9.3x10^36^erg/s to 5.4x10^39^erg/s. The 90% detection completeness limit within the D_25_ ellipse is 5.5x10^37^erg/s. Based on the surface density of background active galactic nuclei (AGNs) and detection completeness, we expect ~45 background AGNs among the catalog sources (~15 within the D_25_ ellipse). There are nine sources with luminosities greater than 10^39^erg/s, which are candidates for ultraluminous X-ray sources. The nuclear source of NGC 4649 is a low-luminosity AGN, with an intrinsic 2.0-8.0keV X-ray luminosity of 1.5x10^38^erg/s. The X-ray colors suggest that the majority of the catalog sources are low-mass X-ray binaries (LMXBs). We find that 164 of the 501 X-ray sources show long-term variability, indicating that they are accreting compact objects. We discover four transient candidates and another four potential transients. We also identify 173 X-ray sources (141 within the D_25_ ellipse) that are associated with globular clusters (GCs) based on Hubble Space Telescope and ground-based data; these LMXBs tend to be hosted by red GCs. Although NGC 4649 has a much larger population of X-ray sources than the structurally similar early-type galaxies, NGC 3379 and NGC 4278, the X-ray source properties are comparable in all three systems.

Keywords
  1. galaxies
  2. x-ray-sources
  3. active-galactic-nuclei
  4. x-ray-binary-stars
  5. globular-star-clusters
Bibliographic source Bibcode
2013ApJS..204...14L
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/204/14
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJS/204/14
Document Object Identifer DOI
doi:10.26093/cds/vizier.22040014

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/204/14
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/204/14
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/204/14
IVOA Table Access TAP
https://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/204/14/catalog?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/204/14/catalog?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/204/14/catalog?

History

2013-04-25T10:46:11Z
Resource record created
2013-04-25T10:46:11Z
Created
2017-07-12T15:02:48Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr