Computer Science
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..100i&link_type=abstract
Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam
Computer Science
Scientific paper
We attempted to evaluate the contribution of X-rays from young stellar objects to the ionization of the molecular cloud in NGC1333 star forming region in the Perseus molecular cloud complex. Broad-band X-ray observation of this region was carried out with ASCA in 1995, and numerous X-ray sources were detected. From the results of the ASCA observations, we obtained the lower limit for the X-ray ionization rate of ζX = 6.7 x 10-17 sec-1 . We observed this region with the 45m-φ telescope at the Nobeyama Radio Observatory in 1998. From the intensities of 13CO,C18O, H13CO+, and DCO+ (J=1-0) molecular lines, we evaluated the ionization degree and the total ionization rate to be xe = 1.6 x 10-7, and ζ = 1.1 x 10-16 sec-1. The current results support the possibility that the X-rays from the YSOs give non-negligible contribution to the ionization of the gas in the molecular cloud. The values above are the average over the observed region, and more detailed analysis considering the spatial dependence of the X-ray and molecular line intensities is ongoing.
Fukunaga H.
Itoh Makoto
Koyama Katsuji
Sekimoto Yutaro
Tatematsu Ken'ichi
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