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DC Field | Value | Language |
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dc.contributor.author | Anantharamaiah, K.R. | - |
dc.contributor.author | Dwarakanath, K.S. | - |
dc.contributor.author | Morris, D. | - |
dc.contributor.author | Goss, W.M. | - |
dc.contributor.author | Radhakrishnan, V. | - |
dc.date.accessioned | 2006-07-07T06:41:35Z | - |
dc.date.available | 2006-07-07T06:41:35Z | - |
dc.date.issued | 1993-06 | - |
dc.identifier.citation | Astrophysical Journal, 1993, Vol.410, p110-115 | en |
dc.identifier.issn | 0004-637X | - |
dc.identifier.issn | 1538-4357 (online) | - |
dc.identifier.uri | http://hdl.handle.net/2289/1423 | - |
dc.description.abstract | We 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.extent | 1242037 bytes | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | en | en |
dc.publisher | The University of Chicago Press for the American Astronomical Society | en |
dc.relation.uri | http://adsabs.harvard.edu/cgi-bin/bib_query?1993ApJ...410..110A | en |
dc.rights | (1993) by the American Astronomical Society. Scanned images provided by the NASA ADS Data System. | en |
dc.subject | POSITRONIUM | en |
dc.subject | RADIO SPECTRA | en |
dc.subject | RECOMBINATION REACTIONS | en |
dc.subject | VERY LARGE ARRAY (VLA) | en |
dc.subject | X RAY SOURCES | en |
dc.subject | GALACTIC NUCLEI | en |
dc.subject | MILKY WAY GALAXY | en |
dc.title | VLA observations of 1E 1740.7-2942 - A search for radio recombination lines of positronium | en |
dc.type | Article | en |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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1993 ApJ V410 p110.pdf | 6p. | 1.21 MB | Adobe PDF | View/Open |
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