AST/RO CO (4-3) Observations of the Central Kiloparsec of the Milky Way

Details AST/RO CO (4-3) Observations of the Central Kiloparsec of the Milky Way AST/RO CO (4-3) Observations of the Central Kiloparsec of the Milky Way

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.5805b&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #58.05; Bulletin of the American Astronomical Society, Vol. 30, p.904

Astronomy and Astrophysics

Astrophysics

Scientific paper

We have imaged the CO 4-3 line, the dominant coolant of the dense molecular interstellar medium, from the Galactic Center region, between l=-3 to 4 degrees and b= -1 to 1 degrees. We detect bright CO 4-3 emission from the well-known Galactic Center clouds Sgr A, Sgr B, Sgr C, and Sgr D. We compare the CO 4-3 intensities with CO 1-0, C18O 1-0, HCN 1-0, and HCO+ 1-0 from the literature to infer excitation conditions. The CO 4-3 traces fairly warm, dense gas with opacities near unity. We also detect CO 4-3 absorption at V= 0 km/s along the line of sight toward the Galactic Center. This research was supported in part by the National Science Foundation under a cooperative agreement with the Center for Astrophysical Research in Antarctica (CARA), grant number NSF OPP 89-20223. CARA is a National Science Foundation Science and Technology Center.

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