1998A&A...339L..81O

Query : 1998A&A...339L..81O

1998A&A...339L..81O - Astronomy and Astrophysics, volume 339L81-84 (1998/11-3)

Low interstellar abundance of O2 confirmed by the PIROG8 balloon experiment.

OLOFSSON G., PAGANI L., TAUBER J., FEBVRE P., DESCHAMPS A., ENCRENAZ P., FLOREN H.-G., GEORGE S., LECOMTE B., LJUNG B., NORDH L., PARDO J.R., PERON I., SJOEKVIST M., STEGNER K., STENMARK L. and ULLBERG C.

Abstract (from CDS):

Using a balloon-borne 60cm telescope equipped with an SIS receiver we have searched for the 425GHz molecular oxygen line in the NGC 7538 and the W 51 regions. The experiment was technically successful (confirmed by the detection of the 13CO (4-3) line at 440GHz), but we failed to detect emission from molecular oxygen. The inferred upper limits of the O2/CO ratio are 0.04 and 0.05 (3σ) for the two regions, which are the lowest upper limits so far determined for Galactic clouds.

Abstract Copyright: ∼

Journal keyword(s): interstellar medium: abundances - interstellar medium: clouds - interstellar medium: molecules - interstellar medium: individual objects: NGC 7538, W 51 - radio lines: interstellar medium

Simbad objects: 2

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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 - 2026 		#notes
1 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
2 NGC 7538 OpC 23 13 37 +61 30.0           ~ 920 1

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