Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.284..395r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 284, Issue 2, pp. 395-400.
Astronomy and Astrophysics
Astronomy
19
Stars: Formation, Ism: Clouds, Ism: Individual: Ngc 2023, Reflection Nebulae, Infrared: Ism: Lines And Bands.
Scientific paper
Observations of the reflection nebula NGC 2023, a region of recent star formation, have revealed small-scale structure in the associated molecular cloud, close to the exciting star, at a spatial resolution of 50 to 75 au. These results have been obtained using adaptive optics on the ESO 3.6-m telescope at La Silla, observing in the H_2 v=1-0 S(1) near-IR emission line at 2.121 mu. Our observations are among the first to involve the use of adaptive optics combined with spectral line resolution. The observed fragment of molecular cloud, a remnant of the material from which the B-star in NGC 2023 formed, contains a number of features whose H_2 emission brightness contrast to the surrounding material is an order of magnitude. These structures are interpreted in terms of clumps of gas exhibiting a density contrast of at least an order of magnitude. We discuss the possibility that turbulence plays a role in the creation of the observed structures.
Deltorn Jean-Marc
Falgarone Edith
Field David
Lai Olivier
Lemaire Jean Louis
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