VANDAM IV. Free-free emission from protostars Virtual Observatory Resource

Authors
  1. Tychoniec L.
  2. Tobin J.J.
  3. Karska A.
  4. Chandler C.
  5. Dunham M.M.
  6. Harris R.J.,Kratter K.M.
  7. Li Z.-Y.
  8. Looney L.W.
  9. Melis C.
  10. Perez L.M.
  11. Sadavoy S.I.,Segura-Cox D.
  12. van Dishoeck E.F.
  13. Published by
    CDS
Abstract

Emission from protostars at centimeter radio wavelengths has been shown to trace the free-free emission arising from ionizing shocks as a result of jets and outflows driven by protostars. Therefore, measuring properties of protostars at radio frequencies can provide valuable insights into the nature of their outflows and jets. We present a C-band (4.1 and 6.4cm) survey of all known protostars (Class0 and ClassI) in Perseus as part of the VLA Nascent Disk and Multiplicity (VANDAM) Survey. We examine the known correlations between radio flux density and protostellar parameters, such as bolometric luminosity and outflow force, for our sample. We also investigate the relationship between radio flux density and far-infrared line luminosities from Herschel. We show that free-free emission most likely originates from J-type shocks; however, the large scatter indicates that those two types of emission probe different time and spatial scales. Using C-band fluxes, we removed an estimation of free-free contamination from the corresponding Ka- band (9mm) flux densities that primarily probe dust emission from embedded disks. We find that the compact (<1") dust emission is lower for Class I sources (median dust mass 96M_{Earth}_) relative to Class 0 (248M_{Earth}_), but several times higher than in Class II (5-15M_{Earth}_). If this compact dust emission is tracing primarily the embedded disk, as is likely for many sources, this result provides evidence of decreasing disk masses with protostellar evolution, with sufficient mass for forming giant planet cores primarily at early times.

Keywords
  1. molecular-clouds
  2. young-stellar-objects
  3. radio-continuum-emission
  4. surveys
Bibliographic source Bibcode
2018ApJS..238...19T
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/238/19
IVOA Identifier IVOID
ivo://CDS.VizieR/J/ApJS/238/19
Document Object Identifer DOI
doi:10.26093/cds/vizier.22380019

Access

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http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/238/19
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/238/19
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/238/19
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http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/238/19/table4?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/238/19/table4?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/238/19/table4?
IVOA Cone Search SCS
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http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/238/19/table5?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/238/19/table5?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/238/19/table5?
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https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/238/19/table1?
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IVOA Cone Search SCS
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http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/238/19/table6?
IVOA Cone Search SCS
For use with a cone search client (e.g., TOPCAT).
http://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/238/19/table7?
https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/238/19/table7?
http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/238/19/table7?

History

2019-01-04T11:58:07Z
Resource record created
2019-01-04T11:58:07Z
Created
2021-02-23T07:58:11Z
Updated

Contact

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