2010A&A...521L..40Y

Query : 2010A&A...521L..40Y

2010A&A...521L..40Y - Astronomy and Astrophysics, volume 521, L40-40 (2010/10-1)

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

YILDIZ U.A., VAN DISHOECK E.F., KRISTENSEN L.E., VISSER R., JORGENSEN J.K., HERCZEG G.J., VAN KEMPEN T.A., HOGERHEIJDE M.R., DOTY S.D., BENZ A.O., BRUDERER S., WAMPFLER S.F., DEUL E., BACHILLER R., BAUDRY A., BENEDETTINI M., BERGIN E., BJERKELI P., BLAKE G.A., BONTEMPS S., BRAINE J., CASELLI P., CERNICHARO J., CODELLA C., DANIEL F., DI GIORGIO A.M., DOMINIK C., ENCRENAZ P., FICH M., FUENTE A., GIANNINI T., GOICOECHEA J.R., DE GRAAUW T., HELMICH F., HERPIN F., JACQ T., JOHNSTONE D., LARSSON B., LIS D., LISEAU R., LIU F.-C., MARSEILLE M., McCOEY C., MELNICK G., NEUFELD D., NISINI B., OLBERG M., PARISE B., PEARSON J.C., PLUME R., RISACHER C., SANTIAGO-GARCIA J., SARACENO P., SHIPMAN R., TAFALLA M., TIELENS A.G.G.M., VAN DER TAK F., WYROWSKI F., DIELEMAN P., JELLEMA W., OSSENKOPF V., SCHIEDER R. and STUTZKI J.

Abstract (from CDS):

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 25-30km/s) emission. Radiative transfer models are used to constrain the temperature of this shocked gas to 100-200K. Several CO and ¹³CO line profiles also reveal a medium-broad component (FWHM 5-10km/s), 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 25K, thus providing new direct evidence for a CO ice evaporation zone around low-mass protostars.

Abstract Copyright: ∼

Journal keyword(s): astrochemistry - stars: formation - ISM: jets and outflows - ISM: molecules

Simbad objects: 6

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Number of rows : 6

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Sp type	#ref 1850 - 2023	#notes
1	[JCC87] IRAS 2A	Y*O	03 28 55.55	+31 14 36.7	~	443	3
2	V* V512 Per	Or*	03 29 03.7578170808	+31 16 03.947525688	M3.5	377	0
3	[JCC87] IRAS 4A	Y*O	03 29 10.49	+31 13 30.8	~	696	1
4	[JCC87] IRAS 4	FIR	03 29 10.9	+31 13 26	~	478	0
5	NGC 1333	OpC	03 29 11.3	+31 18 36	~	1407	1
6	[JCC87] IRAS 4B	Y*O	03 29 12.058	+31 13 02.05	~	592	0

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