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- Lefloch, B. (author)
The CHESS spectral survey of star forming regions : Peering into the protostellar shock L1157-B1. II. Shock dynamics
- Article/chapterEnglish2010
Publisher, publication year, extent ...
- 2010-07-16
- EDP Sciences,2010
- printrdacarrier
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- LIBRIS-ID:oai:DiVA.org:su-51505
- https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-51505URI
- https://doi.org/10.1051/0004-6361/201014630DOI
Supplementary language notes
- Language:English
- Summary in:English
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- SwePubSwePub
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- authorCount :77
- Context. The outflow driven by the low-mass class 0 protostar L1157 is the prototype of the so-called chemically active outflows. The bright bowshock B1 in the southern outflow lobe is a privileged testbed of magneto-hydrodynamical (MHD) shock models, for which dynamical and chemical processes are strongly interdependent. Aims: We present the first results of the unbiased spectral survey of the L1157-B1 bowshock, obtained in the framework of the key program “Chemical HErschel Surveys of star forming regions” (CHESS). The main aim is to trace the warm and chemically enriched gas and to infer the excitation conditions in the shock region. Methods: The CO 5-4 and o-H2O 110-101 lines have been detected at high-spectral resolution in the unbiased spectral survey of the HIFI-band 1b spectral window (555-636 GHz), presented by Codella et al. in this volume. Complementary ground-based observations in the submm window help establish the origin of the emission detected in the main-beam of HIFI and the physical conditions in the shock. Results: Both lines exhibit broad wings, which extend to velocities much higher than reported up to now. We find that the molecular emission arises from two regions with distinct physical conditions : an extended, warm (100 K), dense (3 × 105 cm-3) component at low-velocity, which dominates the water line flux in Band 1; a secondary component in a small region of B1 (a few arcsec) associated with high-velocity, hot (>400 K) gas of moderate density ((1.0-3.0) × 104 cm-3), which appears to dominate the flux of the water line at 179μm observed with PACS. The water abundance is enhanced by two orders of magnitude between the low- and the high-velocity component, from 8 × 10-7 up to 8 × 10-5. The properties of the high-velocity component agree well with the predictions of steady-state C-shock models. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA.
Subject headings and genre
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- stars: formation
- ISM: jets and outflows
- ISM: individual objects: L1157
- Astronomy and astrophysics
- Astronomi och astrofysik
- Astronomy
- astronomi
Added entries (persons, corporate bodies, meetings, titles ...)
- Cabrit, S. (author)
- Codella, C. (author)
- Melnick, G. (author)
- Cernicharo, J. (author)
- Caux, E. (author)
- Benedettini, M. (author)
- Boogert, A. (author)
- Caselli, P. (author)
- Ceccarelli, C. (author)
- Gueth, F. (author)
- Hily-Blant, P. (author)
- Lorenzani, A. (author)
- Neufeld, D. (author)
- Nisini, B. (author)
- Pacheco, S. (author)
- Pagani, L. (author)
- Pardo, J. R. (author)
- Parise, B. (author)
- Salez, M. (author)
- Schuster, K. (author)
- Viti, S. (author)
- Bacmann, A. (author)
- Baudry, A. (author)
- Bell, T. (author)
- Bergin, E. A. (author)
- Blake, G. (author)
- Bottinelli, S. (author)
- Castets, A. (author)
- Comito, C. (author)
- Coutens, A. (author)
- Crimier, N. (author)
- Dominik, C. (author)
- Demyk, K. (author)
- Encrenaz, P. (author)
- Falgarone, E. (author)
- Fuente, A. (author)
- Gerin, M. (author)
- Goldsmith, P. (author)
- Helmich, F. (author)
- Hennebelle, P. (author)
- Henning, T. (author)
- Herbst, E. (author)
- Jacq, T. (author)
- Kahane, C. (author)
- Kama, M. (author)
- Klotz, A. (author)
- Langer, W. (author)
- Lis, D. (author)
- Lord, S. (author)
- Maret, S. (author)
- Pearson, J. (author)
- Phillips, T. (author)
- Saraceno, P. (author)
- Schilke, P. (author)
- Tielens, X. (author)
- van der Tak, F. (author)
- van der Wiel, M. (author)
- Vastel, C. (author)
- Wakelam, V. (author)
- Walters, A. (author)
- Wyrowski, F. (author)
- Yorke, H. (author)
- Bachiller, R. (author)
- Borys, C. (author)
- de Lange, G. (author)
- Delorme, Y. (author)
- Kramer, C.Stockholms universitet,Institutionen för astronomi (author)
- Larsson, BengtStockholms universitet,Institutionen för astronomi(Swepub:su)bem (author)
- Lai, R. (author)
- Maiwald, F. W. (author)
- Martin-Pintado, J. (author)
- Mehdi, I. (author)
- Ossenkopf, V. (author)
- Siegel, P. (author)
- Stutzki, J. (author)
- Wunsch, J. H. (author)
- Stockholms universitetInstitutionen för astronomi (creator_code:org_t)
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- In:Astronomy and Astrophysics: EDP Sciences518, s. L113-0004-63611432-0746
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- Benedettini, M.
- Boogert, A.
- Caselli, P.
- Ceccarelli, C.
- Gueth, F.
- Hily-Blant, P.
- Lorenzani, A.
- Neufeld, D.
- Nisini, B.
- Pacheco, S.
- Pagani, L.
- Pardo, J. R.
- Parise, B.
- Salez, M.
- Schuster, K.
- Viti, S.
- Bacmann, A.
- Baudry, A.
- Bell, T.
- Bergin, E. A.
- Blake, G.
- Bottinelli, S.
- Castets, A.
- Comito, C.
- Coutens, A.
- Crimier, N.
- Dominik, C.
- Demyk, K.
- Encrenaz, P.
- Falgarone, E.
- Fuente, A.
- Gerin, M.
- Goldsmith, P.
- Helmich, F.
- Hennebelle, P.
- Henning, T.
- Herbst, E.
- Jacq, T.
- Kahane, C.
- Kama, M.
- Klotz, A.
- Langer, W.
- Lis, D.
- Lord, S.
- Maret, S.
- Pearson, J.
- Phillips, T.
- Saraceno, P.
- Schilke, P.
- Tielens, X.
- van der Tak, F.
- van der Wiel, M.
- Vastel, C.
- Wakelam, V.
- Walters, A.
- Wyrowski, F.
- Yorke, H.
- Bachiller, R.
- Borys, C.
- de Lange, G.
- Delorme, Y.
- Kramer, C.
- Larsson, Bengt
- Lai, R.
- Maiwald, F. W.
- Martin-Pintado, ...
- Mehdi, I.
- Ossenkopf, V.
- Siegel, P.
- Stutzki, J.
- Wunsch, J. H.
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