The large scale structure of the galactic center at low radio frequencies.

Details The large scale structure of the galactic center at low radio frequencies. The large scale structure of the galactic center at low radio frequencies.

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997a%26a...327..569a&link_type=abstract

Astronomy and Astrophysics, v.327, p.569-576

Astronomy and Astrophysics

Astrophysics

1

Galaxy: Center, Galaxy: Structure, Radio Continuum: General

Scientific paper

A region about 10° around the galactic center (G.C.) has been studied in surveys available between 19.7 and 408MHz. The maps show a trough near the G.C. sided by two intense emission peaks. Interpreting the observations as produced by an HII region that absorbs the radiation from bright non-thermal sources we propose a model consisting of four sources concentric with the G.C. and embedded in a diffused non-thermal background. Two sources, the broad and the narrow, are non-thermal and we determine their temperature spectrum (indices -2.7 and -2.4, respectively), the third source is an HII region for which we compute the emission measure, and the fourth source is Sgr A complex. The broad source is prominently seen below 408 MHz while the presence of the narrow source is reported here for the first time.

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