Images of HCO+ (1-0) Emission in a Molecular Cloud near 1E1740.7-2942

Details Images of HCO+ (1-0) Emission in a Molecular Cloud near 1E1740.7-2942 Images of HCO+ (1-0) Emission in a Molecular Cloud near 1E1740.7-2942

1994-11-09

arxiv.org/abs/astro-ph/9411037v2

Astronomy and Astrophysics

Astrophysics

7 pages + 3 figures, AAS LaTeX macros, submitted to ApJL, uuencode'd, tar'ed, gzip'ed PostScript figures also available

Scientific paper

10.1086/187810

We have observed the hard X-ray source 1E1740.7-2942 in the HCO+ (1-0) line using the Owens Valley millimeter interferometer. Previous single dish observations have found HCO+ emission coincident with the location of the radio continuum hot spots of the radio source associated with 1E1740.7-2942. Our higher resolution observations show a 15 arcsec offset between the HCO+ emission and the location of the radio hot spots. We propose that the lack of emission results from a large ionization rate, exceeding $10^{-15}$ s$^{-1}$, in the neighborhood of 1E1740.7-2942.

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