Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000mnras.313..663g&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 313, Issue 4, pp. 663-670.
Astronomy and Astrophysics
Astronomy
10
Stars: Formation, Ism: Clouds, Ism: Individual: Ngc 2068, Ism: Jets And Outflows, Ism: Molecules, Radio Lines: Ism
Scientific paper
We report the discovery of high-velocity dense gas from a bipolar outflow source near NGC 2068 in the L1630 giant molecular cloud. CO and HCO+ J=3->2 line wings have a bipolar distribution in the vicinity of LBS 17-H with the flow orientated roughly east-west and perpendicular to the elongation of the submillimetre dust continuum emission. The flow is compact (total extent ~0.2pc) and contains of the order of 0.1Msolar of swept-up gas. The high-velocity HCO+ emission is distributed over a somewhat smaller area <0.1pc in extent. A map of C18O J=2->1 emission traces the LBS 17 core and follows the ambient HCO+ emission reasonably well, with the exception of the direction towards LBS 17-H where there is a significant anticorrelation between the C18O and HCO+. A comparison of beam-matched C18O and dust-derived H2 column densities suggests that CO is depleted by up to a factor of ~50 at this position if the temperature is as low as 9K, although the difference is substantially reduced if the temperature is as high as 20K. Chemical models of collapsing clouds can account for this discrepancy in terms of different rates of depletion on to dust grains for CO and HCO+. LBS 17-H has a previously known water maser coincident with it but there are no known near-infrared, IRAS or radio continuum sources associated with this object, leading to the conclusion that it is probably very young. A greybody fit to the continuum data gives a luminosity of only 1.7Lsolar and a submillimetre-to-bolometric luminosity ratio of 0.1, comfortably satisfying the criteria for classification as a class 0 protostar candidate.
Gibb Andrew G.
Little Leslie T.
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