New Herschel-identified Orion Protostars: Characterizing An Extreme Population Of Cold Sources

Details New Herschel-identified Orion Protostars: Characterizing An Extreme Population Of Cold Sources New Herschel-identified Orion Protostars: Characterizing An Extreme Population Of Cold Sources

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934110s&link_type=abstract

American Astronomical Society, AAS Meeting #219, #341.10

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a new population of serendipitously identified Orion protostars. These protostars, designated PACS Bright Red Sources (PBRS), were identified in PACS 70 um observations for the Herschel Orion Protostar Survey (HOPS). Here we focus on the nine reddest PBRS in our sample: in contrast to the known Orion protostars targeted in HOPS, the reddest PBRS are undetected or very faint in the Spitzer 24 um imaging. They are redder than any of the known Orion Class 0 protostars, and appear similar in their 70 um to 24 um colors to the most extreme Class 0 objects known. These new Orion protostars are likely to be in a very early and short lived stage of protostellar evolution: the population of red PBRS is generally characterized by very low bolometric temperatures of 25 K and bolometric luminosities of ranging from 1 to about 10 solar luminosities. Here we present our initial characterization of these sources through analysis of the observed Spitzer, Herschel, and APEX broad-band SEDs. In addition, we will present results from our observational campaign to obtain auxiliary long-wavelength data aimed at characterizing the PBRS.

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