Combined BIMA and OVRO Observations of Comet C/1999 S4 (LINEAR) | Zendy

M. R. Hogerheijde | Zendy; Imke de Pater | Zendy; M. C. H. Wright | Zendy; J. R. Forster | Zendy; L. E. Snyder | Zendy; Anthony J. Remijan | Zendy; L. M. Woodney | Zendy; Michael F. A’Hearn | Zendy; Patrick Palmer | Zendy; Y.J. Kuan | Zendy; Hui Huang | Zendy; Geoffrey A. Blake | Zendy; Chunhua Qi | Zendy; J. E. Kessler | Zendy; ShengYuan Liu | Zendy

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Combined BIMA and OVRO Observations of Comet C/1999 S4 (LINEAR)

Author(s) -

M. R. Hogerheijde,

Imke de Pater,

M. C. H. Wright,

J. R. Forster,

L. E. Snyder,

Anthony J. Remijan,

L. M. Woodney,

Michael F. A’Hearn,

Patrick Palmer,

Y.J. Kuan,

Hui Huang,

Geoffrey A. Blake,

Chunhua Qi,

J. E. Kessler,

ShengYuan Liu

Publication year - 2004

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/382710

Subject(s) - comet , physics , astrophysics , millimeter , coma (optics) , beam (structure) , line (geometry) , optics , geometry , mathematics

We present results from an observing campaign of the molecular content of thecoma of comet C/1999 S4 (LINEAR) carried out jointly with the millimeter-arraysof the Berkeley-Illinois-Maryland Association (BIMA) and the Owens Valley RadioObservatory (OVRO). Using the BIMA array in autocorrelation (`single-dish')mode, we detected weak HCN J=1-0 emission from comet C/1999 S4 (LINEAR) at 14+- 4 mK km/s averaged over the 143" beam. The three days over which emissionwas detected, 2000 July 21.9-24.2, immediately precede the reported fullbreakup of the nucleus of this comet. During this same period, we find an upperlimit for HCN 1-0 of 144 mJy/beam km/s (203 mK km/s) in the 9"x12" synthesizedbeam of combined observations of BIMA and OVRO in cross-correlation (`imaging')mode. Together with reported values of HCN 1-0 emission in the 28" IRAM30-meter beam, our data probe the spatial distribution of the HCN emission fromradii of 1300 to 19,000 km. Using literature results of HCN excitation incometary comae, we find that the relative line fluxes in the 12"x9", 28" and143" beams are consistent with expectations for a nuclear source of HCN andexpansion of the volatile gases and evaporating icy grains following a Hasermodel.Comment: 18 pages, 3 figures. Uses aastex. AJ in pres

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