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Title:
X-Ray Analysis of the rho Ophiuchi Dark Cloud with ASCA: Source Identification, X-Ray Spectra, and Temporal Variability
Authors:
Kamata, Yuichi; Koyama, Katsuji; Tsuboi, Yohko; Yamauchi, Shigeo
Affiliation:
AA(Department of Astrophysics, School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01; [-6pt]), AB(Department of Astrophysics, School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-01; [-6pt]), AC(Department of Physics, Graduated School of Science, Kyoto University, Sakyo-ku, Kyoto 606-01), AD(Faculty of Humanities and Social Sciences, Iwate University, 3-18-34 Ueda, Morioka, Iwate 020})
Publication:
Publ. of the Astronomical Society of Japan, v.49, p.461-470. (PASJ Homepage)
Publication Date:
08/1997
Origin:
PASJ
PASJ Keywords:
STARS: FLARE, STARS: PRE-MAIN-SEQUENCE, STARS: X-RAYS, X-RAYS: SOURCES, X-RAYS: SPECTRA
Bibliographic Code:
1997PASJ...49..461K

Abstract

This paper presents a comprehensive study with the Japanese X-ray astronomical satellite ASCA on X-rays from the main body of the rho Ophiuchi dark cloud. We have constructed separate X-ray images using 3 energy bands and 12 time-sliced data, and thereby detected 19 X-ray sources, doubling the previous ASCA results of 11 X-ray sources. Three of the sources are associated with class-I infrared sources, which precede the T Tauri phase. Half of the 19 sources were found to be time variable, and 5 flare-like events with an averaged energy of >3times 10(35) erg were observed. With the analogy of solar flares, we estimated the flare loop height and plasma density to be 3*E(11) cm and 3*E(11) cm(-3) , respectively. Among these sources, a flare from the class-I source EL 29 exhibited an order-of-magnitude larger absorption (N_H) than in quiescence states, which may indicate the exsistence of a dense protostellar disk.

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