The Occultation of the QSO J0237+2848 by Comet C/1996 B2 (Hyakutake)

Details The Occultation of the QSO J0237+2848 by Comet C/1996 B2 (Hyakutake) The Occultation of the QSO J0237+2848 by Comet C/1996 B2 (Hyakutake)

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aj....113.1429b&link_type=abstract

Astronomical Journal v.113, p. 1429-1432 (1997)

Astronomy and Astrophysics

Astronomy

2

Scientific paper

We observed the bright, extragalactic background source J0237+2848 with the VLBA as comet 1996/B2 (Hyakutake) passed nearby in the plane of the sky. We searched for molecular absorption in all four 18-cm OH lines to sample the column density of that molecule as a function of position in the coma of the comet. We detected no absorption in the lines above a 3sigma opacity limit of 0.018 in the 1667 MHz line. This yields an upper limit on the column density of OH (NOH) of NOH < 2 x 10(12) \ cm(-2) at an angular separation of ~ 22.2 arcmin from the nucleus of the comet, corresponding to ~ 10(6) km linear distance. We use this upper limit on NOH to infer an upper limit on the production of H_2O from the nucleus (QH_2O) of QH_2O < 2 x 10(33) \ s(-1) .

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