2010A&A...521L..41J

Query : 2010A&A...521L..41J

2010A&A...521L..41J - Astronomy and Astrophysics, volume 521, L41-41 (2010/10-1)

Herschel/HIFI spectroscopy of the intermediate mass protostar NGC 7129 FIRS 2.

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

Abstract (from CDS):

Herschel/HIFI observations of water from the intermediate mass protostar NGC7129 FIRS 2 provide a powerful diagnostic of the physical conditions in this star formation environment. Six spectral settings, covering four H₂¹⁶O and two H₂¹⁸O lines, were observed and all but one H₂¹⁸O line were detected. The four H₂¹⁶O lines discussed here share a similar morphology: a narrower, ≃6km/s, component centered slightly redward of the systemic velocity of NGC7129 FIRS 2 and a much broader, ≃25km/s component centered blueward and likely associated with powerful outflows. The narrower components are consistent with emission from water arising in the envelope around the intermediate mass protostar, and the abundance of H₂O is constrained to ≃10^–7 for the outer envelope. Additionally, the presence of a narrow self-absorption component for the lowest energy lines is likely due to self-absorption from colder water in the outer envelope. The broader component, where the H₂O/CO relative abundance is found to be ≃0.2, appears to be tracing the same energetic region that produces strong CO emission at high J.

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Journal keyword(s): astrochemistry - stars: formation

Simbad objects: 2

Full paper

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Number of rows : 2

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2023	#notes
1	NGC 7129	OpC	21 42 58	+66 06.8			11.5			~	259	0
2	NAME NGC 7129 FIR 2	IR	21 44 01.5	+66 03 40						~	95	0

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