Galactic center compact radio sources from JVLA obs. Virtual Observatory Resource

Authors
  1. Zhao J.-H.
  2. Morris M.R.
  3. Goss W.M.
  4. Published by
    CDS
Abstract

Using Jansky Very Large Array data obtained from high-resolution observations at 5.5GHz at multiple epochs in 2014 and 2019, we have detected a population of radio variables and transients in the radio-bright zone at the Galactic center. With observations covering a sky area of 180arcmin^2^ at an angular resolution of 0.4, we report new detections of 110 Galactic center compact radio (GCCR) sources with a size of <1". The flux densities of GCCR sources exceed 70{mu}Jy, with at least 10{sigma} significance. Among these sources, 82 are variable or transient and 28 are nonvariable. About 10% of them are expected to be extragalactic background sources. We discuss the possible astrophysical nature of the detected sources. As compared to the Galactic disk (GD) population of normal pulsars (NPs) and millisecond pulsars (MSPs), a majority (80%) of the GCCR sources appear to fall within the high flux density tail of the pulsar distribution, as extrapolated from a sample of NPs in the GD. However, MSPs extrapolated from the GD population are too weak to have contributed significantly to the GCCR population that has been detected. We also cross-correlated the GCCR sources with X-ray sources in Chandra X-ray catalogs and found that 42 GCCR sources have candidate X-ray counterparts. Most of the GCCR sources having X-ray counterparts are likely to be associated with unresolved or slightly resolved radio jets launched from X-ray binaries with a compact object, either a black hole or a neutron star.

Keywords
  1. radio-sources
  2. galactic-center
  3. x-ray-sources
Bibliographic source Bibcode
2020ApJ...905..173Z
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/905/173
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/905/173
Document Object Identifer DOI
doi:10.26093/cds/vizier.19050173

Access

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http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/905/173
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/905/173
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/905/173
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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).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/905/173/table2?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/905/173/table2?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/905/173/table2?

History

2022-08-08T11:18:33Z
Resource record created
2022-08-08T11:18:33Z
Created
2022-08-26T13:27:30Z
Updated

Contact

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