A search for (H_2O)_2 in the Galaxy and toward comet Hale-Bopp

Details A search for (H_2O)_2 in the Galaxy and toward comet Hale-Bopp A search for (H_2O)_2 in the Galaxy and toward comet Hale-Bopp

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...335.1070s&link_type=abstract

Astronomy and Astrophysics, v.335, p.1070-1076 (1998)

Astronomy and Astrophysics

Astrophysics

1

Ism: Abundances, Ism: Molecules, Radio Lines: Ism, Line: Identification, Molecular Processes, Comets: Individual: C/1995 O1 (Hale-Bopp)

Scientific paper

The MPIfR 100 m telescope, the NRAO 12 m telescope, and the IRAM 30 m telescope were used to search for low lying rotational transitions of the water dimer, (H_2O)_2, toward the Galactic cloud cores Orion-KL, W51 d, W51e1e2, NGC 7538, Sgr B2(M) and L134N, and toward comet Hale-Bopp. The comet was observed on December 20, 1996 and March 25/26, 1997 (i.e. near perihelion on April 1) at 24 GHz. No lines of (H_2O)_2 were found. Our limit for the abundance of (H_2O)_2 relative to that of water (from H_2(18) O data) is typically <10(-4) toward dense cloud cores. Toward Orion-KL an even more stringent limit of <8 10(-6) is derived. The abundance of (H_2O)_2 relative to H_2 is typically <10(-10) . Our data show that at perihelion the production rate of the water dimer of comet C/1995 O1 (Hale-Bopp) was <5.7 10(29) s(-1) . This is less than 6% the production rate of H_2O.

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