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19 April 2024

» arxiv » 1008.0867

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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-Garcia ; 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 ; J. Stutzki ;
Date:	4 Aug 2010
Abstract:	Herschel-HIFI observations of high-J lines (up to J_u=10) of 12CO, 13CO and C18O 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 12CO 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 13CO line profiles also reveal a medium-broad component (FWHM 5-10 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 C18O 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.
Source:	arXiv, 1008.0867
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