X-Ray Observation of the L1157 Dark Cloud Region with ASCA

Details X-Ray Observation of the L1157 Dark Cloud Region with ASCA X-Ray Observation of the L1157 Dark Cloud Region with ASCA

2000-06-09

arxiv.org/abs/astro-ph/0006127v1

Astronomy and Astrophysics

Astrophysics

18 pages, 2 figures, Latex(PASJadd.sty, PASJ95.sty), accepted for publication in PASJ

Scientific paper

ASCA observation of a region containing a Class 0 protostar, IRAS 20386+6751 in the L1157 dark cloud, has been carried out. The protostar was not detected, and the 95% upper limit to the luminosity depends on assumed Nh : Lx(0.5-10 keV) < 1.1e31 erg/s for Nh = 1e23 cm^-2. A Class I protostar in L1152, IRAS 20353+6742, in the same field was also undetected with the upper limit about three times as much as the L1157 level. Besides these non detections, nine new X-ray sources were detected and spectral analysis was performed for 4 sources. One object (AXJ 2038+6801) shows a hard spectrum with a temperature kT = 8 keV or a power-law photon index = 2.0 and absorbed with Nh = 2e22 cm^-2. Another fainter one (AXJ 2036+6800) has a soft spectrum with most of the emission falling below 2 keV. We examine possible nature of these new X-ray sources based on their spectral properties.

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