The recent formation of massive stars in the Galactic Center region

Details The recent formation of massive stars in the Galactic Center region The recent formation of massive stars in the Galactic Center region

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3189s&link_type=abstract

Spitzer Proposal ID #3189

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Scientific paper

Star formation activity is strikingly prominent and peculiar in the Central Molecular Zone (CMZ, |l| < 1.5 deg, |b| < 0.5 deg), as shown by the emission from giant molecular clouds, from the radio range (e.g. Guesten 1989, Bitran et al. 1997) to the infrared (Cox & Laureijs 1989, Launhardt et al. 2002). The Arches, the Quintuplet and the central helium star clusters, all within 30 pc of the central radio source Sgr A*, give further testimony that recent bursts of massive star formation have been occurring in the nuclear disk of the Galaxy. Up to now, most work on recent star formation in the CMZ has focused on these exceptional clusters near the center, or on the large complexes such as Sgr B2 and Sgr C, which are conspicuous due to their prominent radio emission. Using mid-infrared ISOGAL data, complemented by the MSX catalog, we have extracted a sample of 300 massive Young Stellar Object (YSO) candidates over the entire CMZ, including the apparently relatively quiet regions outside of these large complexes. We propose to make use of the spectro-imaging capabilities of the IRS instrument to ascertain the nature and derive bolometric luminosities for a subsample of these candidates. This sample is complete down to a 15 micron flux density of 140 mJy over a 0.1 sq. deg. area. The IRS data, complemented with present and future data in the infrared and radio ranges, will allow us to characterize the star formation activity in the exceptional environment of the Galactic Center in great detail, and to infer informations about the star formation in the cusps of other galaxies, including active galactic nuclei.

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