Remijan, Anthony J. and Friedel, D. N. and de Pater, Imke and Hogerheijde, M. R. and Snyder, L. E. and A'Hearn, M. F. and Blake, Geoffrey A. and Dickel, H. R. and Forster, J. R. and Kraybill, C. and Looney, L. W. and Palmer, Patrick and Wright, M. C. H. (2006) A BIMA Array Survey of Molecules in Comets LINEAR (C/2002 T7) and NEAT (C/2001 Q4). Astrophysical Journal, 643 (1). pp. 567-572. ISSN 0004-637X http://resolver.caltech.edu/CaltechAUTHORS:20110616-111150432
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We present an interferometric search for large molecules, including methanol (CH_3OH), methyl cyanide (CH_3CN), ethyl cyanide (CH_3CH_2CN), ethanol (CH_3CH_2OH), and methyl formate (CH_3OCHO), in comets LINEAR (C/2002 T7) and NEAT (C/2001 Q4) with the Berkeley-Illinois-Maryland Association (BIMA) array. We also searched for transitions of the simpler molecules CS, SiO, HNC, HN^(13)C, and ^(13)CO. We detected transitions of CH_3OH and CS around comet LINEAR and one transition of CH_3OH around comet NEAT within a synthesized beam of ~20". We calculated the total column density and production rate of each molecular species using the variable temperature and outflow velocity (VTOV) model recently described by Friedel et al. Considering the molecular production rate ratios with respect to water, comet T7 LINEAR is more similar to comet Hale-Bopp, while comet Q4 NEAT is more similar to comet Hyakutake. It is unclear, however, due to such a small sample size, whether there is a clear distinction between a Hale-Bopp and Hyakutake class of comet or whether comets have a continuous range of molecular production rate ratios.
|Additional Information:||© 2006 The American Astronomical Society. Received 2005 December 30; accepted 2006 January 26. We thank J. R. Dickel for assisting with the observations, an anonymous referee for many helpful comments, and D. G. Schleicher for providing H2O and CN production rates. This work was partially funded by NSF AST 02-28953, AST 02-28963, AST 02-28974, and AST 02-28955, and the Universities of Illinois, Maryland, and California, Berkeley, and Caltech.|
|Subject Keywords:||comets: individual (LINEAR (C/2002 T7), NEAT (C/2001 Q4)); molecular processes; radio lines: solar system; techniques: interferometric|
|Official Citation:||A BIMA Array Survey of Molecules in Comets LINEAR (C/2002 T7) and NEAT (C/2001 Q4) Anthony J. Remijan, D. N. Friedel, Imke de Pater, M. R. Hogerheijde, L. E. Snyder, M. F. A'Hearn, Geoffrey A. Blake, H. R. Dickel, J. R. Forster, C. Kraybill, L. W. Looney, Patrick Palmer, and M. C. H. Wright doi: 10.1086/502713|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||16 Jun 2011 18:41|
|Last Modified:||26 Dec 2012 13:19|
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