Observations of B335 in the Millimeter Continuum and the 226 GHz H2CO Line

Details Observations of B335 in the Millimeter Continuum and the 226 GHz H2CO Line Observations of B335 in the Millimeter Continuum and the 226 GHz H2CO Line

2007-07-18

arxiv.org/abs/0707.2640v1

Astronomy and Astrophysics

Astrophysics

Scientific paper

The protostar B335 was observed in the 1.3 mm continuum and in the H2CO 312 - 211 line with an angular resolution of about 8 arcsec. The mass of the inner envelope detected by the dust continuum emission is about 0.02 Msun. The H2CO spectrum at the protostellar position shows a blue-skewed double peak profile, suggesting that the kinematics of the inner envelope is dominated by infall motion. When the blueshifted and the redshifted peaks were imaged separately, however, there is a small east-west displacement between the maximum positions. This displacement suggests that some part of the H2CO emission might come from the outflowing gas. A combined effect of the infalling envelope and the outflow on the radiative transfer is discussed. This effect can make the line profile asymmetry severer than what is expected from infall-only models.

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