A LOFAR sample of OCRS in dwarf galaxies Virtual Observatory Resource

Authors
  1. Vohl D.
  2. Vedantham H.K.
  3. Hessels J.W.T.
  4. Bassa C.G.
  5. Cook D.O.
  6. Kaplan D.L.,Shimwell T.W.
  7. Zhang C.
  8. Published by
    CDS
Abstract

The vast majority of extra-galactic, compact continuum radio sources are associated with star formation or jets from (super)massive black holes and, as such, are more likely to be found in association with starburst galaxies or early type galaxies. Recently, two new populations of radio sources have been identified: (a) compact and persistent sources (PRS) associated with fast radio bursts (FRB) in dwarf galaxies and (b) compact sources in dwarf galaxies that could belong to the long-sought population of intermediate-mass black holes. Despite the interesting aspects of these newly found sources, the current sample size is small, limiting scrutiny of the underlying population. Here, we present a search for compact radio sources coincident with dwarf galaxies. We search the LOFAR Two-meter Sky Survey (LoTSS) -- the most sensitive low-frequency (144MHz central frequency) large-area survey for optically thin synchrotron emission to date. Exploiting LoTSS' high spatial resolution (6arcsec) and low astrometric uncertainty (~0.2arcsec), we match its compact sources to the compiled sample of dwarf galaxies in the Census of the Local Universe -- an H Alpha survey with the Palomar Observatory's 48-inch Samuel Oschin Telescope. We identify 29 over-luminous compact radio sources, evaluate the probability of chance alignment within the sample, investigate the potential nature of these sources, and evaluate their volumetric density and volumetric rate. While optical line-ratio diagnostics on the nebular lines from the host galaxies prefer a star-formation origin (against an AGN origin), future high angular resolution radio data is necessary to ascertain the origin of the radio sources. We discuss planned strategies to differentiate them between candidate FRB hosts and intermediate-mass black holes.

Keywords
  1. radio-sources
  2. galaxies
Bibliographic source Bibcode
2023A&A...680A..98V
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/680/A98
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/680/A98

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/680/A98
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/680/A98
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/680/A98
IVOA Table Access TAP
http://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/0?
https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/680/A98/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/680/A98/table1?

History

2023-12-15T10:06:18Z
Resource record created
2023-12-15T09:07:07Z
Updated
2023-12-15T10:06:18Z
Created

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