EAS Publications Series
Volume 33, 20082nd ARENA Conference: The Astrophysical Science Cases at Dome C
|Page(s)||157 - 164|
|Published online||13 November 2008|
H. Zinnecker, N. Epchtein and H. Rauer (eds)
EAS Publications Series, 33 (2008) 157-164
Over 1000 Newly Discovered Young Stellar Objects in the Large Magellanic Cloud from the Spitzer SAGE Survey
Space Science Institute, 4750 Walnut St. Suite 205, Boulder, CO 80301, USA
Corresponding author: firstname.lastname@example.org
We have identified over 1000 candidate Young Stellar Objects (YSOs) in the Large Magellanic Cloud as part of the Spitzer Space Telescope Surveying the Agents of a Galaxy's Evolution (SAGE) Legacy program. The YSOs, detected by their excess infrared emission above a stellar photosphere, represent early stages of evolution, still surrounded by disks and/or infalling envelopes. The candidate YSOs were selected from regions of color-magnitude space least confused with other IR-bright populations. Our YSO list is therefore biased towards intermediate- to high-mass and young evolutionary stages, because these overlap less with galaxies and evolved stars in color-magnitude space. We derived masses of the YSOs from SED-fitting, and extrapolated the mass function using a standard IMF to compute a current star formation rate of ~0.06 M๏/yr, which is at the low-end of estimates based on total ultraviolet and infrared flux from the galaxy (~0.05-0.25 M๏/yr); and consistent with the expectation that our current YSO list is incomplete. High spatial resolution K_dark- and L-band observations at Dome C could distinguish the lower-mass YSOs from galaxies, based on their morphologies (diffuse vs. point sources). This will add thousands more YSOs to our census and improve our estimates of star formation rate, molecular cloud lifetimes, and hierarchical star formation. In addition, the high spatial resolution Dome C observations can detect multiplicity in the SAGE-identified YSOs which can be incorporated into our YSO SED models.
© EAS, EDP Sciences, 2008
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