2012A&A...539L...3B


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.09CET11:20:39

2012A&A...539L...3B - Astronomy and Astrophysics, volume 539, L3-3 (2012/3-1)

The CHESS survey of the L1157-B1 shock: the dissociative jet shock as revealed by Herschel-PACS.

BENEDETTINI M., BUSQUET G., LEFLOCH B., CODELLA C., CABRIT S., CECCARELLI C., GIANNINI T., NISINI B., VASTA M., CERNICHARO J., LORENZANI A., DI GIORGIO A.M. (THE CHESS TEAM)

Abstract (from CDS):

Outflows generated by protostars heavily affect the kinematics and chemistry of the hosting molecular cloud through strong shocks that enhance the abundance of some molecules. L1157 is the prototype of chemically active outflows, and a strong shock, called B1, is taking place in its blue lobe between the precessing jet and the hosting cloud. We present the Herschel-PACS 55-210µm spectra of the L1157-B1 shock, showing emission lines from CO, H2O, OH, and [OI]. The spatial resolution of the PACS spectrometer allows us to map the warm gas traced by far-infrared (FIR) lines with unprecedented detail. The rotational diagram of the high-Jup CO lines indicates high-excitation conditions (Tex≃210±10K). We used a radiative transfer code to model the hot CO gas emission observed with PACS and in the CO(13-12) and (10-9) lines measured by Herschel-HIFI. We derive 200<Tkin<800K and n≥105cm–3. The CO emission comes from a region of about 7'' located at the rear of the bow shock where the [OI] and OH emission also originate. Comparison with shock models shows that the bright [OI] and OH emissions trace a dissociative J-type shock, which is also supported by a previous detection of [FeII] at the same position. The inferred mass-flux is consistent with the ``reverse'' shock where the jet is impacting on the L1157-B1 bow shock. The same shock may contribute significantly to the high-Jup CO emission.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: individual objects: L1157-B1 - ISM: molecules - ISM: jets and outflows

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME LDN 1157-mm Y*O 20 39 06.2 +68 02 15           ~ 154 0
2 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 463 0
3 [DE95] LDN 1157 B1 out 20 39 11 +68 01.3           ~ 166 0

    Equat.    Gal    SGal    Ecl

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2019.12.09-11:20:39

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