期刊
ASTRONOMICAL JOURNAL
卷 125, 期 4, 页码 2108-2122出版社
UNIV CHICAGO PRESS
DOI: 10.1086/368138
关键词
ISM : clouds; ISM : globules; ISM : individual (Horsehead Nebula); ISM : kinematics and dynamics; stars : formation
We present the first interferometric CO (1-0) map of the Horsehead Nebula, made with the Berkeley-Illinois-Maryland Association array. The map has an angular resolution of about 1000, corresponding to about 0.02 pc. The CO form of the Horsehead closely matches its appearance in visible dust, with the CO emission dominated by a bright, thin ridge along its western side. The molecular cloud exhibits a pronounced velocity gradient of 5 km s(-1) pc(-1) from the northeast to the southwest, with the southwestern portion being redshifted. The mass of the cloud is 27 M-.. We find an unusual U-shaped feature aligned with the horse's nose'' for which we discuss several interpretations. The northern portion of the U may trace a small outflow driven by the embedded young star B33-1. We discuss the formation, evolution, and ultimate fate of this well-known nebula.
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