Spitzer Spectroscopy of the Mysterious Infrared Source IRAS 15099-5856

Details Spitzer Spectroscopy of the Mysterious Infrared Source IRAS 15099-5856 Spitzer Spectroscopy of the Mysterious Infrared Source IRAS 15099-5856

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50495k&link_type=abstract

Spitzer Proposal ID #50495

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Scientific paper

We have recently discovered a mysterious, bright mid-infrared object in the Galactic plane using the Infrared Camera aborad AKARI satellite. This object, IRAS 15099-5856, is composed of a bright central compact source, knots and spurs surrounding it, and several extended arc-like filaments. The SED of the central compact source increases steeply from 10 to 25 um with a spectral index of -6.5, and remains flat at 30 Jy to 90 um. The source does not have a counterpart in other wave bands except two possible candidates of 19th Ks-mag point sources. We can think of post-AGB stars with thick envelope, highly-embedded class 0 protostars, or infrared-luminous galaxies, but none of them seems to explain the observed mid-infrared properties. IRAS 15099-5856 can potentially be a unique source of a new class. In order to unveil the hidden mysterious nature of the object, we propose to carry out Spitzer IRS observations. We ask 0.55 hrs of total observing time.

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