Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225..808s&link_type=abstract
Astrophysical Journal, Part 1, vol. 225, Nov. 1, 1978, p. 808-814.
Astronomy and Astrophysics
Astrophysics
19
Carbon Monoxide, Globular Clusters, Hydrogen, Interstellar Gas, Electron Transitions, H Alpha Line, Ionizing Radiation, Photoionization, Star Distribution, X Ray Sources
Scientific paper
Five globular clusters, including the X-ray cluster M15, were observed in the 2.6 mm transition of CO to limits (3 sigma) of T(A)(asterisk) = 0.08-0.4 K, with no detections. Upper limits on the mass of molecular hydrogen deduced from our observations are M(H2) less than 0.2-6.0 solar masses. Model calculations were used to estimate the amount of molecular hydrogen that may be shielded from photoionization, on the basis of estimates for the UV intensity in clusters and observed limits on H II emission. These estimates indicate that unless the neutral gas is in globules which are very small and dense, it will be difficult to shield more than 1 solar mass of molecular hydrogen. It is therefore unlikely that the observed irregularities in the cluster star distribution can be attributed to dark clouds.
Barrett Alan H.
Buxton R. B.
Ho Pak Tung
Myers Phil C.
Schneps Matthew H.
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