Formaldehyde Absorption toward Sagittarius A

Details Formaldehyde Absorption toward Sagittarius A Formaldehyde Absorption toward Sagittarius A

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...461..223p&link_type=abstract

Astrophysical Journal v.461, p.223

Astronomy and Astrophysics

Astronomy

4

Galaxy: Center, Ism: Individual Name: Sagittarius A, Ism: Molecules

Scientific paper

Observations of the 110-111 line of formaldehyde with an angular resolution of 9".5 x 20".6 (P.A. = 4° east of north) toward Sgr A are presented. The velocity resolution is 3 km s-1, and the velocity range extends from -220 to +154 km s-1. The H2CO line data show that the molecular gas is distributed in clouds ranging in mass from 103.5 to 104.8 Msun, with a typical density of 105.5 cm-3. These clouds are estimated to be gravitationally stable at present but will have lifetimes of less than 106 yr because of tidal forces from Sgr A*. There appears to be an underabundance of formaldehyde in the Galactic center region and particularly in the circumnuclear disk. This may be due to destruction by shocks in this region.

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