2007A&A...466..999L

Query : 2007A&A...466..999L

2007A&A...466..999L - Astronomy and Astrophysics, volume 466, 999-1003 (2007/5-2)

Molecular oxygen in the ρ Ophiuchi cloud.

LARSSON B., LISEAU R., PAGANI L., BERGMAN P., BERNATH P., BIVER N., BLACK J.H., BOOTH R.S., BUAT V., CROVISIER J., CURRY C.L., DAHLGREN M., ENCRENAZ P.J., FALGARONE E., FELDMAN P.A., FICH M., FLOREN H.G., FREDRIXON M., FRISK U., GAHM G.F., GERIN M., HAGSTROEM M., HARJU J., HASEGAWA T., HJALMARSON A., JOHANSSON L.E.B., JUSTTANONT K., KLOTZ A., KYROELAE E., KWOK S., LECACHEUX A., LILJESTROEM T., LLEWELLYN E.J., LUNDIN S., MEGIE G., MITCHELL G.F., MURTAGH D., NORDH L.H., NYMAN L.-A., OLBERG M., OLOFSSON A.O.H., OLOFSSON G., OLOFSSON H., PERSSON G., PLUME R., RICKMAN H., RISTORCELLI I., RYDBECK G., SANDQVIST A.A., SCHEELE F.V., SERRA G., TORCHINSKY S., TOTHILL N.F., VOLK K., WIKLIND T., WILSON C.D., WINNBERG A. and WITT G.

Abstract (from CDS):

Molecular oxygen, O₂, has been expected historically to be an abundant component of the chemical species in molecular clouds and, as such, an important coolant of the dense interstellar medium. However, a number of attempts from both ground and from space have failed to detect O₂ emission. The work described here uses heterodyne spectroscopy from space to search for molecular oxygen in the interstellar medium. The Odin satellite carries a 1.1m sub-millimeter dish and a dedicated 119GHz receiver for the ground state line of O₂. Starting in 2002, the star forming molecular cloud core ρ Oph A was observed with Odin for 34 days during several observing runs. We detect a spectral line at v_LSR=+3.5km/s with Δv_FWHM=1.5km/s, parameters which are also common to other species associated with ρ Oph A. This feature is identified as the O₂ (N_J = 1₁ - 1₀) transition at 118750.343MHz. The abundance of molecular oxygen, relative to H₂, is 5x10^–8 averaged over the Odin beam. This abundance is consistently lower than previously reported upper limits.

Abstract Copyright: ∼

Journal keyword(s): ISM: individual objects: ρ Oph A - ISM: clouds - ISM: molecules - ISM: abundances - stars: formation - radio lines: ISM

CDS comments: Fig.1 SMM 16267 is [WAF99] SMM J16267-2417 in Simbad. Sources EL27 and S1 not identified in Simbad.

Simbad objects: 8

Full paper

View the references in ADS

Number of rows : 8

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Sp type	#ref 1850 - 2024	#notes
1	GSS 26	Y*O	16 26 10.33152	-24 20 54.8232	M0	83	1
2	[JJK2008] SMM J162622-24225	smm	16 26 21.60	-24 22 54.8	~	41	0
3	[CHG85] GSS 30 IRS 3	Y*O	16 26 21.77376	-24 22 51.3948	~	63	0
4	NAME rho Oph A Cloud	MoC	16 26 26.4	-24 22 33	~	291	1
5	NAME VLA 1623-243	Y*O	16 26 26.42	-24 24 30.0	~	403	0
6	[SSG2006] MMS002	smm	16 26 26.50	-24 24 30.9	~	241	0
7	NAME SMM J16267-2417	cor	16 26 43.5	-24 17 26	~	9	0
8	NAME Ophiuchus Molecular Cloud	SFR	16 28 06	-24 32.5	~	3567	1

To bookmark this query, right click on this link: simbad:objects in 2007A&A...466..999L and select 'bookmark this link' or equivalent in the popup menu