29 June 2000 Scientific results and prospects from the 8.2-m Subaru Telescope: star forming regions
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Abstract
This article describes results of the first light observations of the Orion nebular an dL1551 IRS 5 carried out with the Subaru telescope in January 1999. The new RI images of the Orion nebula, taken under the seeing conditions of 0.2 inch-0.5 inch, cover the area of 5 by 5 feet centered on the Trapezium cluster, revealing details of the BN/KL region, the bright bar, and other conspicuous features as well as several new H2 emission sources. There are more than 500 stars detected; most of them are not visible in optical images and are embedded in the molecular cloud behind the nebula. Their K'-band luminosity function confirmed the bump around 12 mag with a tail toward the fainter end of 17 mag. Some of these most faint stars may be good candidates for young brown dwarfs. The J-band image of L1551 IRS 5 revealed a pair of twisted jets emanating possibly from each of the binary protostars. The two jets are spatially resolved for the first time from the ground, with wiggly and knotty appearance similar to the R-band image taken with the Hubble Space Telescope, suggesting that the appearance is intrinsic to them and is not caused due to the spatial variation of extinction. Successive grism spectroscopy proved that the jet emission predominantly arises from the (Fe II) lines.
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Masahiko Hayashi, Masahiko Hayashi, Kazuhiro Sekiguchi, Kazuhiro Sekiguchi, } "Scientific results and prospects from the 8.2-m Subaru Telescope: star forming regions", Proc. SPIE 4005, Discoveries and Research Prospects from 8- to 10-Meter-Class Telescopes, (29 June 2000); doi: 10.1117/12.390145; https://doi.org/10.1117/12.390145
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