Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.1807y&link_type=abstract
American Astronomical Society, AAS Meeting #212, #18.07; Bulletin of the American Astronomical Society, Vol. 40, p.213
Astronomy and Astrophysics
Astronomy
1
Scientific paper
To better understand the nature of star formation activity in the central region of the Galaxy, we present highlights of 24micron observations of the inner 8x2degrees of the Galactic center using MIPS. On the large scale, we present the striking distribution of stellar emission from a high concentration of strong IR-excess objects, candidate YSOs or UCHII regions, on the negative latitude side of the Galactic center. This distribution is in contrast to the asymmetric distribution of central molecular zone showing 3/4 of molecular gas on the positive longitude side of the Galactic center region. The presence of these objects suggests that recent star formation at l > 0degrees may have been responsible for the asymmetric distribution of central molecular zone. On the small scale, the 24micron data is combined with near-IR, mid-IR, radio and submm images to study prominent sites of on-going star formation as traced by class I and II methanol masers. We present an association between methanol masers and a class of highly embedded YSOs showing enhanced 4.5micron emission due to excited molecular lines (i.e.,"embedded green objects''). We present SEDs of these sources and estimate their physical characteristics including their mass and luminosity. Lastly, we present a comparison of 24micron diffuse emission and nonthermal radio filaments distributed in the Galactic center region.
Arendt Richard G.
Burton Marcia
Hewitt John W.
Hinz Joannah L.
Lang Christian
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