Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...568l.127f&link_type=abstract
The Astrophysical Journal, Volume 568, Issue 2, pp. L127-L130.
Astronomy and Astrophysics
Astronomy
17
Ism: Clouds, Ism: Individual: Alphanumeric: M16, Ism: Molecules, Stars: Formation
Scientific paper
We observed heads of two molecular pillars in the Eagle Nebula using the Nobeyama Millimeter Array with a spatial resolution of 3", 5", and 3" in the 13CO (J=1-0) line, C18O (J=1-0) line, and 2.7 mm continuum, respectively. We found six 13CO subclumps and four C18O cores. The 13CO clouds are elongated so as to have a head-tail structure, with the heads orientated toward the O star exciting M16. The elongation is likely to be due to radiation or wind from the O star. The cloud surface appears to be compressed, as indicated by strong 13CO emission at the cloud rim. The shapes of the 13CO clouds are quite similar to those of the dark cloud observed in the near-infrared. Three out of the four C18O cores are located within one of the 13CO clouds. One of the three cores, located near the tip of the 13CO cloud, is associated with a 2.7 mm continuum emission peak and is most likely a protostar. It is not associated with a known near-infrared source. The other two cores are located farther from the O star and are most likely starless cores. Thus, these C18O cores are aligned in order of age, with the more evolved objects closer to the O star. This linear sequence suggests the propagation of star formation activity, i.e., sequential star formation, driven by the O star. A similar sequence of a young stellar object and a C18O core was found in the other head of the molecular pillar.
Fukuda Naoya
Hanawa Tomoyuki
Sugitani Koji
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