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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/1387
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dc.contributor.authorPedlar, A.-
dc.contributor.authorAnantharamaiah, K.R.-
dc.contributor.authorEkers, R.D.-
dc.contributor.authorGoss, W.M.-
dc.contributor.authorVan Gorkom, J.H.-
dc.contributor.authorSchwarz, U.J.-
dc.contributor.authorZhao, J.H.-
dc.date.accessioned2006-06-28T06:28:49Z-
dc.date.available2006-06-28T06:28:49Z-
dc.date.issued1989-07-15-
dc.identifier.citationAstrophysical Journal, 1989, Vol.342, p 769-784en
dc.identifier.issn0004-637X-
dc.identifier.issn1538-4357 (online)-
dc.identifier.urihttp://hdl.handle.net/2289/1387-
dc.description.abstractVLA observations of the Sgr A complex at 90 cm, 20 cm, and 6 cm are combined to obtain spectral index and optical depth distributions across the source and are used to constrain the three-dimensional structure at the Galactic center. At 90 cm the 'spiral' structure of the thermal source Sgr A West is clearly seen in absorption against the nonthermal emission of Sgr A East, showing conclusively that the former is in front of the latter. The entire shell of Sgr A East shows a low-frequency turnover corresponding to an optical depth of 1-2. This turnover corresponds to free-free absorption with an emission measure of about 100,000 pc/cm exp 6 if the electron temperature is about 5000 K. The approximately 7 arcmin halo surrounding Sgr A East and West also shows a low-frequency turnover. It is suggested that the halo contains a mixture of thermal and nonthermal gas and that the thermal component is responsible for the absorption extending across Sgr A East.en
dc.format.extent3980325 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?1989ApJ...342..769Pen
dc.rights(1989) by the American Astronomical Society. Scanned images provided by the NASA ADS Data System.en
dc.subjectcentimeter wavesen
dc.subjectgalactic nucleien
dc.subjectgalactic structureen
dc.subjectmilky way galaxyen
dc.subjectradio astronomyen
dc.subjectactive galactic nucleien
dc.subjectsagittarius constellationen
dc.subjectstar formationen
dc.subjectsupernovaeen
dc.subjectvery large array (VLA)en
dc.titleRadio studies of the Galactic Center. I. The Sagittarius A complexen
dc.typeArticleen
Appears in Collections:Research Papers (A&A)

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