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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1423
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dc.contributor.authorAnantharamaiah, K.R.-
dc.contributor.authorDwarakanath, K.S.-
dc.contributor.authorMorris, D.-
dc.contributor.authorGoss, W.M.-
dc.contributor.authorRadhakrishnan, V.-
dc.date.accessioned2006-07-07T06:41:35Z-
dc.date.available2006-07-07T06:41:35Z-
dc.date.issued1993-06-
dc.identifier.citationAstrophysical Journal, 1993, Vol.410, p110-115en
dc.identifier.issn0004-637X-
dc.identifier.issn1538-4357 (online)-
dc.identifier.urihttp://hdl.handle.net/2289/1423-
dc.description.abstractWe have searched for the Ps87-alpha recombination line of positronium at the position of the Einstein X-ray source 1E 1740.7-2942 which has been identified as a strong source of time-variable annihilation line radiation. No line was detected with a 3 sigma upper limit of 330 microJy for a line width of 23.5 MHz, the expected width if the temperature of the annihilation region is about 7 x 10 exp 4 K. A continuum image of the field made from the same data shows, within the 90 percent confidence error circle of the X-ray source, a weak radio source with a core and lobe structure similar to extragalactic double radio sources. Comparison with other observations shows that the radio flux density of the core at 6 cm had increased by a factor of about 2.6 between 1991 October 7 and November 16 and has been decreasing steadily since then. We have explored some possible relations between the radio source and the X-ray source. We find that the radio and the X-ray sources could well be associated with each other. The nature of this source is uncertain - it could be either Galactic or extragalactic. In either case this source is a unique object.en
dc.format.extent1242037 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoenen
dc.publisherThe University of Chicago Press for the American Astronomical Societyen
dc.relation.urihttp://adsabs.harvard.edu/cgi-bin/bib_query?1993ApJ...410..110Aen
dc.rights(1993) by the American Astronomical Society. Scanned images provided by the NASA ADS Data System.en
dc.subjectPOSITRONIUMen
dc.subjectRADIO SPECTRAen
dc.subjectRECOMBINATION REACTIONSen
dc.subjectVERY LARGE ARRAY (VLA)en
dc.subjectX RAY SOURCESen
dc.subjectGALACTIC NUCLEIen
dc.subjectMILKY WAY GALAXYen
dc.titleVLA observations of 1E 1740.7-2942 - A search for radio recombination lines of positroniumen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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