Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pasj...52.1087y&link_type=abstract
Publications of the Astronomical Society of Japan, v.52, p.1087-L1096.
Astronomy and Astrophysics
Astronomy
4
Ism: Individual (Ngc 2023, Ngc 2024), Stars: Pre-Main Sequence, X-Rays: Sources, X-Rays: Spectra, X-Rays: Stars
Scientific paper
This paper presents the properties of X-ray sources in the regions of NGC 2023 and NGC 2024 observed with ASCA. We found 14 point-like sources in the NGC 2023 field. In the NGC 2024 field, on the other hand, we found extended X-ray emission in the central dust lane of NGC 2024, and resolved 5 point-like sources around the nebula. From the positional coincidence and moderate column density of N_H ~ 1.6*E22 H cm-2, the extended source is mostly attributable to an integrated emission from X-ray emitting young stellar objects (YSOs) found with ROSAT. However, the plasma temperature of ~ 4 keV is higher than the ROSAT results as well as those of usual YSOs. Possible counterparts have been found for the other resolved sources, except two; one has large absorption at low energies and the other has moderate absorption. The plasma temperatures and luminosities from the point sources, except for an O-type star zeta Ori and a star exhibiting X-ray flares, are estimated to be ~ 1-5 keV and 1030.6-1031.5 erg s-1 in the 0.5-10.0 keV energy band (assuming the distance of 400 pc), respectively. We found no X-ray peak at the position of a Class 0 protostar, NGC 2023-MM1.
Kamimura Reiko
Koyama Katsuji
Yamauchi Shigeo
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