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Herschel/HIFI observations of high-J CO lines in the NGC 1333 low-mass star-forming region

Yıldız, U. A. and Blake, G. A. and Lis, D. (2010) Herschel/HIFI observations of high-J CO lines in the NGC 1333 low-mass star-forming region. Astronomy and Astrophysics, 521 . Art. No. L40. ISSN 0004-6361.

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Herschel/HIFI observations of high-J lines (up to J_u = 10) of ^(12)CO, ^(13)CO and C^(18)O are presented toward three deeply embedded low-mass protostars, NGC 1333 IRAS 2A, IRAS 4A, and IRAS 4B, obtained as part of the Water In Star-forming regions with Herschel (WISH) key program. The spectrally-resolved HIFI data are complemented by ground-based observations of lower-J CO and isotopologue lines. The ^(12)CO 10–9 profiles are dominated by broad (FWHM 25–30 km s^(−1)) emission. Radiative transfer models are used to constrain the temperature of this shocked gas to 100–200 K. Several CO and ^(13)CO line profiles also reveal a medium-broad component (FWHM5–10 km ^(s−1)), seen prominently in H2O lines. Column densities for both components are presented, providing a reference for determining abundances of other molecules in the same gas. The narrow C^(18)O 9–8 lines probe the warmer part of the quiescent envelope. Their intensities require a jump in the CO abundance at an evaporation temperature around 25 K, thus providing new direct evidence for a CO ice evaporation zone around low-mass protostars.

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Blake, G. A.0000-0003-0787-1610
Lis, D.0000-0002-0500-4700
Additional Information:© 2010 ESO. Received 31 May 2010, Accepted 2 August 2010, Published online 01 October 2010. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. Appendices and acknowledgements (pages 5 to 7) are only available in electronic form at The authors are grateful to many funding agencies and the HIFI-ICC staff who has been contributing for the construction of Herschel and HIFI for many years. HIFI has been designed and built by a consortium of institutes and university departments from across Europe, Canada and the United States under the leadership of SRON Netherlands Institute for Space Research, Groningen, The Netherlands and with major contributions from Germany, France and the US. Consortium members are: Canada: CSA, U. Waterloo; France: CESR, LAB, LERMA, IRAM; Germany: KOSMA, MPIfR, MPS; Ireland, NUI Maynooth; Italy: ASI, IFSI-INAF, Osservatorio Astrofisico di Arcetri- INAF; Netherlands: SRON, TUD; Poland: CAMK, CBK; Spain: Observatorio Astronómico Nacional (IGN), Centro de Astrobiología (CSIC-INTA). Sweden: Chalmers University of Technology – MC2, RSS & GARD; Onsala Space Observatory; Swedish National Space Board, Stockholm University – Stockholm Observatory; Switzerland: ETH Zurich, FHNW; USA: Caltech, JPL, NHSC.
Subject Keywords:astrochemistry – stars: formation – ISM: jets and outflows – ISM: molecules
Record Number:CaltechAUTHORS:20110110-090237093
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Official Citation:Herschel/HIFI observations of high-J CO lines in the NGC 1333 low-mass star-forming region U. A. Yıldız, E. F. van Dishoeck, L. E. Kristensen, R. Visser, J. K. Jørgensen, G. J. Herczeg, T. A. van Kempen, M. R. Hogerheijde, S. D. Doty, A. O. Benz, S. Bruderer, S. F. Wampfler, E. Deul, R. Bachiller, A. Baudry, M. Benedettini, E. Bergin, P. Bjerkeli, G. A. Blake, S. Bontemps, J. Braine, P. Caselli, J. Cernicharo, C. Codella, F. Daniel, A. M. di Giorgio, C. Dominik, P. Encrenaz, M. Fich, A. Fuente, T. Giannini, J. R. Goicoechea, Th. de Graauw, F. Helmich, F. Herpin, T. Jacq, D. Johnstone, B. Larsson, D. Lis, R. Liseau, F.-C. Liu, M. Marseille, C. McCoey, G. Melnick, D. Neufeld, B. Nisini, M. Olberg, B. Parise, J. C. Pearson, R. Plume, C. Risacher, J. Santiago-García, P. Saraceno, R. Shipman, M. Tafalla, A. G. G. M. Tielens, F. van der Tak, F. Wyrowski, P. Dieleman, W. Jellema, V. Ossenkopf, R. Schieder and J. Stutzki A&A 521 L40 (2010) DOI: 10.1051/0004-6361/201015119
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21659
Deposited By: Benjamin Perez
Deposited On:10 Jan 2011 17:47
Last Modified:31 Aug 2017 03:02

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