Query : 2003A&A...401L...5G

2003A&A...401L...5G - Astronomy and Astrophysics, volume 401, L5-8 (2003/4-1)

Dust emission from young outflows: The case of L1157.


Abstract (from CDS):

We present new high-sensitivity 1.3mm bolometer observations of the young outflow L1157. These data show that the continuum emission arises from four distinct components: a circumstellar disk, a protostellar envelope, an extended flattened envelope - the dense remnant of the molecular cloud in which the protostar was formed -, and the outflow itself, which represents ∼20% of the total flux. The outflow emission exhibits two peaks that are coincident with the two strong shocks in the southern lobe of L1157. We show that the mm continuum is dominated by thermal dust emission arising in the high velocity material. The spectral index derived from the new 1.3mm data and 850µm observations from Shirley et al. (2000ApJS..131..249S), is ∼5 in the outflow, significantly higher than in the protostellar envelope (∼3.5). This can be explained by an important line contamination of the 850µm map, and/or by different dust characteristics in the two regions, possibly smaller grains in the post-shocks regions of the outflow. Our observations show that bipolar outflows can present compact emission peaks which must not be misinterpreted as protostellar condensations when mapping star forming regions.

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Journal keyword(s):

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 LDN 1527 DNe 04 39 53 +25 45.0           ~ 598 0
2 NAME LDN 1157-mm Y*O 20 39 06.2 +68 02 15           ~ 179 0
3 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 554 0
4 [DE95] LDN 1157 B2 out 20 39 09.3 +68 00 44           ~ 68 0
5 [DE95] LDN 1157 B1 out 20 39 11 +68 01.3           ~ 231 0

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