Issue |
A&A
Volume 518, July-August 2010
Herschel: the first science highlights
|
|
---|---|---|
Article Number | L112 | |
Number of page(s) | 5 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361/201014582 | |
Published online | 16 July 2010 |
Letter to the Editor
The CHESS spectral survey of star forming regions: Peering into the protostellar shock L1157-B1*,**
I. Shock chemical complexity
1
INAF, Osservatorio Astrofisico di Arcetri, Firenze, Italy e-mail: codella@arcetri.astro.it
2
Laboratoire d'Astrophysique de Grenoble, UMR 5571-CNRS, Université Joseph Fourier, Grenoble,
France
3
Centro de Astrobiologìa, CSIC-INTA, Madrid, Spain
4
CESR, Université Toulouse 3 and CNRS, Toulouse, France
5
Department of Physics and Astronomy, University College London, London, UK
6
INAF, Istituto di Fisica dello Spazio Interplanetario, Roma, Italy
7
Max-Planck-Institut für Radioastronomie, Bonn, Germany
8
INAF, Osservatorio Astronomico di Roma, Monte Porzio Catone, Italy
9
School of Physics and Astronomy, University of Leeds, Leeds, UK
10
Observatoire de Paris-Meudon, LERMA UMR CNRS 8112. Meudon, France
11
Infared Processing and Analysis Center, Caltech, Pasadena, USA
12
Institut de RadioAstronomie Millimétrique, Grenoble, France
13
Center for Astrophysics, Cambridge MA, USA
14
Johns Hopkins University, Baltimore MD, USA
15
CNRS/INSU, Laboratoire d'Astrophysique de Bordeaux, Floirac, France
16
California Institute of Technology, Pasadena CA, USA
17
University of Michigan, Ann Arbor, MI 48109, USA
18
Astronomical Institute Anton Pannekoek, University of Amsterdam, Amsterdam, The Netherlands
19
Department of Astrophysics/IMAPP, Radboud University Nijmegen, Nijmegen, The Netherlands
20
IGN Observatorio Astronómico Nacional, Alcalá de Henares, Spain
21
Jet Propulsion Laboratory, Caltech, Pasadena, CA 91109, USA
22
SRON, Institute for Space Research, Groningen, The Netherlands
23
Max-Planck-Institut für Astronomie, Heidelberg, Germany
24
Ohio State University, Columbus OH, USA
25
Physikalisches Institut, Universität zu Köln, Köln, Germany
26
Leiden Observatory, Leiden University, Leiden, The Netherlands
27
Kapteyn Astronomical Institute, Groningen, The Netherlands
28
Institut de RadioAstronomie Millimétrique, Granada, Spain
29
Department of Astronomy, Stockholm University, Stockholm, Sweden
Received:
30
March
2010
Accepted:
5
May
2010
We present the first results of the unbiased survey of the L1157-B1 bow shock, obtained with HIFI in the framework of the key program Chemical HErschel Survey of Star forming regions (CHESS). The L1157 outflow is driven by a low-mass Class 0 protostar and is considered the prototype of the so-called chemically active outflows. The bright blue-shifted bow shock B1 is the ideal laboratory for studying the link between the hot (~1000–2000 K) component traced by H2 IR-emission and the cold (~10–20 K) swept-up material. The main aim is to trace the warm gas chemically enriched by the passage of a shock and to infer the excitation conditions in L1157-B1. A total of 27 lines are identified in the 555–636 GHz region, down to an average 3σ level of 30 mK. The emission is dominated by CO(5–4) and H2O(110–101) transitions, as discussed by Lefloch et al. in this volume. Here we report on the identification of lines from NH3, H2CO, CH3OH, CS, HCN, and HCO+. The comparison between the profiles produced by molecules released from dust mantles (NH3, H2CO, CH3OH) and that of H2O is consistent with a scenario in which water is also formed in the gas-phase in high-temperature regions where sputtering or grain-grain collisions are not efficient. The high excitation range of the observed tracers allows us to infer, for the first time for these species, the existence of a warm (≥200 K) gas component coexisting in the B1 bow structure with the cold and hot gas detected from ground.
Key words: ISM: individual objects: L1157 / ISM: molecules / stars: formation
Herschel is an ESA space observatory with science instruments provided by European-led principal Investigator consortia and with important participation from NASA.
Table 1 is only available in electronic form at http://www.aanda.org
© ESO, 2010
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.