NOAO >   Observing Info >   Approved Programs >   2016A-0149

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Program Information for 2016A-0149


PI: Jon Mauerhan, UC Berkeley, mauerhan@astro.berkeley.edu
Address: Department of Astronomy, 601 Campbell Hall #3411, Berkeley, CA, 94720-3411 USA

CoI: Nathan Smith, U. of Arizona

Title: GeMS narrowband imaging of the massive star factory Sagittarius B

Abstract: Sgr B in the Galactic center (GC) is the most massive and chemically enriched molecular cloud in the Galaxy and the site of vigorous massive star birth. In this region, recent infrared spectroscopy of stellar counterparts to Chandra X-ray sources has resulted in the discovery of a new association of massive emission-line stars, including Wolf-Rayet stars and O supergiants. These discoveries imply that the Sgr B molecular complex has an extensive unidentified massive star population that has been forming for at least 3 Myr. The spatial distribution of spectral types relative to the Sgr B2 cluster of ultra-compact HII regions and massive YSOs identified with Spitzer suggests a continuous trend in stellar age, and could thus represent the most extreme example of self-propagating star formation in the Galaxy. To begin determining the full extent of the massive star population in Sgr B, we propose a narrowband imaging experiment using Gemini's GSAOI/GeMS multi-conjugate AO system, which will reveal hot massive stars via their Br-gamma emission. The results will enable a more accurate determination of the star formation rate, mode, and history within this extreme molecular cloud and the role stellar feedback is playing in shaping the ISM and triggering new star birth.

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2016A):  GEM-SQ/GSAOI -- 4.2hrs band 2 (GS-2016A-Q-55)


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NOAO >   Observing Info >   Approved Programs >   2016A-0149

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