Parameters of radio sources near Sgr A* : J/ApJ/801/L26

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Authors : Yusef-Zadeh F. orcid , Roberts D.A., Wardle M. (hide) , Roberts D.A., Wardle M. et..al

VizieR DOI : 10.26093/cds/vizier.18019026
Bibcode : 2015ApJ...801L..26Y (ADS) (Simbad) (Objects)
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CDS Keywords : Milky Way; Radio sources; Stars, distances
UAT : Milky Way Galaxy, Radio sources, Stellar distance

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Inserted into VizieR : 18-Sep-2017
Last modification : 03-Jan-2018

Radio continuum observations of the Galactic center photoevaporative proplyd-like objects near Sgr A*. (2015)

Keywords : Galaxy center - H II regions - ISM: general - radio continuum: ISM - stars: protostars

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 ...(more)
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Radio continuum observations were carried out with the Karl G. Jansky Very Large Array (VLA) in its A-configuration at 34.5 GHz on 2014 March 9 (14A-232). We observed a field of view with a radius of 39'' centered on Sgr A* in the Ka band (8.7 mm) using the 3 bit sampler system, which provided full polarization correlations in four basebands, each 2 GHz wide, centered at 31.5, 33.5, 35.5, and 37.5 GHz. Each baseband was composed of 16 subbands 128 MHz wide. Each subband was composed of 64 channels, each 2 MHz wide.

  • J/ApJ/699/186 : VLA observations of the Galactic center (Zhao+, 2009)
  • J/A+A/511/A18 : NIR observations of stars near SgrA* (Schoedel+, 2010)

                


                

                    

                


                

                    

                


                

                    
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