Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21536902c&link_type=abstract
American Astronomical Society, AAS Meeting #215, #369.02; Bulletin of the American Astronomical Society, Vol. 42, p.559
Astronomy and Astrophysics
Astronomy
Scientific paper
Being tidally disrupted by the Large and Small Magellanic Clouds, the Magellanic Bridge provides a less favorite environment to form giant molecular clouds (GMCs) and consequently massive stars as they mostly form there. Furthermore, with a low metallicity of 1/5-1/8Z&sun; and hence low dust content, cooling is less effective and makes it more difficult for molecular clumps to collapse and form stars. To study star formation in such extreme environments, we have used mid-IR Spitzer IRAC and MIPS observations, complemented by 2MASS and IRSF JHK catalogs and archival UKST BRI data, to identify massive young stellar objects (YSOs) in the Magellanic Bridge. After careful culling of the initial YSO list by examining multi-wavelength images and SEDs from optical to far-IR, 20 sources remain and are most likely bona fide YSOs. We have modeled their SEDs and found their masses 10 M&sun;. We have compared the distribution of YSOs to those of GMCs, HI gas and ionized gas to investigate their formation mechanism. Only 4 of the 20 YSOs are found in GMCs while the majority are not, though only 8 GMCs are cataloged (Mizuno et al. 2006). Among these 8 GMCs, 5 of them have YSOs (2 GMCs are spatially coincident) and 3 do not. Compared to the distribution of HI gas, the majority of the YSOs are found near regions with high column density. Several are found in low column density regions but near diffuse Hα emission, suggesting triggered star formation. We have further used Spitzer IRS observations of three GMCs with different star formation property and HI column density to examine the dust environments. We have also searched for Herbig Ae/Be stars and used known catalogs of blue stars and clusters to study how star formation proceeded and estimate the star formation efficiency in the Magellanic Bridge.
Chen Rosie Chang-Hui
Gordon Karl Douglas
Indebetouw Remy
SAGE-Smc Team
Solan G. C.
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