Observations of SGR A West and SGR A(asterisk) at the 1.3 MM wavelength

Details Observations of SGR A West and SGR A(asterisk) at the 1.3 MM wavelength Observations of SGR A West and SGR A(asterisk) at the 1.3 MM wavelength

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...190l..25z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 190, no. 1-2, Jan. 1988, p. L25-L28.

Astronomy and Astrophysics

Astrophysics

25

Astronomical Spectroscopy, Cosmic Dust, H Ii Regions, Milky Way Galaxy, Astronomical Maps, Hydrocyanic Acid, Neutral Gases, Radiant Flux Density, Star Clusters

Scientific paper

The authors mapped Sgr A West and its surroundings at λ1.3 mm with an 11arcsec beam and at λ350 μm with a 30arcsec beam. The following results are obtained. (1) The flux density of Sgr A* increases from ≡1 Jy at λ2 cm to ≡2.5 Jy at λ1.3 mm. Alternative interpretations are discussed. (2) The spectrum of Sgr A West in this wavelength range is that of an optically thin H II region. (3) About 20% of the λ1.3 mm and ≡60% of the λ350 μm flux density integrated in a box of ≡60arcsec×100arcsec surrounding Sgr A* is dust emission from the inner edge of the ring of neutral gas and dust surrounding Sgr A West, previously observed by its HCN emission.

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