EARLY-STAGE MASSIVE STAR FORMATION NEAR THE GALACTIC CENTER: Sgr C

S. Kendrew*, A. Ginsburg, K. Johnston, H. Beuther, J. Bally, C. J. Cyganowski, C. Battersby

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

We present near-infrared spectroscopy and 1 mm line and continuum observations of a recently identified site of high mass star formation likely to be located in the Central Molecular Zone (CMZ) near Sgr C. Located on the outskirts of the massive evolved H II region associated with Sgr C, the area is characterized by an Extended Green Object (EGO) measuring ~10'' in size (0.4 pc), whose observational characteristics suggest the presence of an embedded massive protostar driving an outflow. Our data confirm that early-stage star formation is taking place on the periphery of the Sgr C H II region, with detections of two protostellar cores and several knots of H2 and Brackett gamma emission alongside a previously detected compact radio source. We calculate the cores' joint mass to be ~10^3 M_sun, with column densities of 1-2 x 10^24 cm^-2. We show the host molecular cloud to hold ~10^5 M_sun of gas and dust with temperatures and column densities favorable for massive star formation to occur, however, there is no evidence of star formation outside of the EGO, indicating that the cloud is predominantly quiescent. Given its mass, density, and temperature, the cloud is comparable to other remarkable non-star-forming clouds such as G0.253 in the eastern CMZ.

Original languageEnglish
Article number50
Number of pages6
JournalAstrophysical Journal Letters
Volume775
Issue number2
DOIs
Publication statusPublished - 1 Oct 2013

Keywords

  • infrared: ISM
  • ISM: jets and outflows
  • stars: formation
  • EXTENDED GREEN OBJECTS
  • CENTER DUST RIDGE
  • MOLECULAR CLOUDS
  • CONTINUUM EMISSION
  • OUTFLOW CANDIDATES
  • FORMATION RATES
  • CENTER REGION
  • PLANE SURVEY
  • CATALOG
  • PC

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