Astronomy and Astrophysics – Astrophysics – Galaxy Astrophysics
Scientific paper
2009-04-07
Astronomy and Astrophysics
Astrophysics
Galaxy Astrophysics
25 pages, 12 figures, to be published in A&A
Scientific paper
Molecular outflows provide an alternative method of identifying protostellar cores, complementary to recent mid-infrared studies. Continuing our studies of Perseus, we investigate whether all Spitzer-identified protostars, and particularly those with low luminosities, drive outflows, and if any new protostellar cores (perhaps harbouring low-mass sources) can be identified via their outflows alone. We have used the heterodyne array receiver HARP on JCMT to make deep 12CO 3-2 maps of submm cores in Perseus, extending and deepening our earlier study with RxB and bringing the total number of SCUBA cores studied up to 83. Our survey includes 23/25 of the Dunham et al. (2008) Spitzer low-luminosity objects believed to be embedded protostars, including three VeLLOs. All but one of the cores identified as harbouring embedded YSOs have outflows, confirming outflow detections as a good method for identifying protostars. We detect outflows from 20 Spitzer low-luminosity objects. We do not conclusively detect any outflows from IR-quiet cores, though confusion in clustered regions such as NGC1333 makes it impossible to identify all the individual driving sources. This similarity in detection rates despite the difference in search methods and detection limits suggests either that the sample of protostars in Perseus is now complete, or that the existence of an outflow contributes to the Spitzer detectability, perhaps through the contribution of shocked H2 emission in the IRAC bands. For five of the low-luminosity sources, there is no protostellar envelope detected at 350 microns and the Spitzer emission is entirely due to shocks. Additionally, we detect the outflow from IRAS 03282+3035 at 850 microns with SCUBA due to CO line contamination in the continuum passband.
Dunham Michael M.
Hatchell Jennifer
No associations
LandOfFree
Star formation in Perseus - V. Outflows detected by HARP does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Star formation in Perseus - V. Outflows detected by HARP, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Star formation in Perseus - V. Outflows detected by HARP will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-314380