Parameters of radio sources near Sgr A* Virtual Observatory Resource

Authors
  1. Yusef-Zadeh F.
  2. Roberts D.A.
  3. Wardle M.
  4. Cotton W.
  5. Schodel R.,Royster M.J.
  6. Published by
    CDS
Abstract

We present radio images within 30" of Sgr A* based on recent VLA observations at 34 GHz with 7.8 {mu}Jy sensitivity and resolution of ~88x46 mas. We report 44 partially resolved compact sources clustered in two regions in the E arm of ionized gas that orbits Sgr A*. These sources have size scales ranging between ~50 and 200 mas (400-1600 AUs), and a bow-shock appearance facing the direction of Sgr A*. Unlike the bow-shock sources previously identified in the near-IR but associated with massive stars, these 34 GHz sources do not appear to have near-IR counterparts at 3.8 {mu}m. We interpret these sources as a candidate population of photoevaporative protoplanetary disks (proplyds) that are associated with newly formed low mass stars with mass loss rates ~10^-7^-10^-6^ M_{sun}_/yr and are located at the edge of a molecular cloud outlined by ionized gas. The disks are externally illuminated by strong Lyman continuum radiation from the ~100 OB and WR massive stars distributed within 10" of Sgr A*. The presence of proplyds implies current in situ star formation activity near Sgr A* and opens a window for the first time to study low mass star, planetary, and brown dwarf formations near a supermassive black hole. The video abstract was created from a WorldWide Telescope tour file, which is available for download. Viewing the file requires a Windows PC with the WorldWide Telescope desktop client available at worldwidetelescope.org.

Keywords
  1. milky-way-galaxy
  2. radio-sources
  3. stellar-distance
Bibliographic source Bibcode
2015ApJ...801L..26Y
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/801/L26
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJ/801/L26
Document Object Identifer DOI
doi:10.26093/cds/vizier.18019026

Access

Web browser access HTML
https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/801/L26
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/801/L26
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/801/L26
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/ApJ/801/L26/table1?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/801/L26/table1?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/801/L26/table1?

History

2017-09-18T13:05:37Z
Resource record created
2017-09-18T13:05:37Z
Created
2018-01-03T05:34:18Z
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