HST/NICMOS Galactic Center Pα Survey -- Preliminary Result

Details HST/NICMOS Galactic Center Pα Survey -- Preliminary Result HST/NICMOS Galactic Center Pα Survey -- Preliminary Result

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541308d&link_type=abstract

American Astronomical Society, AAS Meeting #215, #413.08; Bulletin of the American Astronomical Society, Vol. 42, p.251

Astronomy and Astrophysics

Astronomy

Scientific paper

In this poster, we will present the first science results from our HST/NICMOS Galactic Center Palpha Survey. Within the whole survey area (416 arcmin2), we have detected 0.6 million sources, i.e. 1400 per arcmin2. This value is larger than the previous ground-based K band survey by a factor of 3. The resolved sources contributed 85% of the total flux in the 1.90 micron image. Through comparing with stellar evolution tracks, we found that most of our sources should be RG or AGB. They represent a bright peak in the magnitude distribution. These stars seem to fall in a disk like structure. Future comparing with the Padova stellar model will help us understand the age of this component. Our high resolution Palpha images also resolve several new extended features, which are related to the local ionization front, magnetic field and potential Sgr A* outflow. We will explain their possible origin through their morphology.

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