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X-Ray Obervation of the Normal Spiral Galaxies NGC2903 and NGC628 with ASCA

Published online by Cambridge University Press:  25 May 2016

T. Mizuno ,
H. Ohbayashi ,
N. Iyomoto  and
K. Makishima
T. Mizuno
Affiliation:
Department of Physics, University of Tokyo 7-3-1 Hongo bunkyo-Ku, Tokyoo 113, Japan
H. Ohbayashi
Affiliation:
Department of Physics, University of Tokyo 7-3-1 Hongo bunkyo-Ku, Tokyoo 113, Japan
N. Iyomoto
Affiliation:
Department of Physics, University of Tokyo 7-3-1 Hongo bunkyo-Ku, Tokyoo 113, Japan
K. Makishima
Affiliation:
Department of Physics, University of Tokyo 7-3-1 Hongo bunkyo-Ku, Tokyoo 113, Japan

Extract

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X-ray emission from spiral galaxies without activity is thought to consist of low-mass X-ray binaries (LMXBs), and the Einstein observations established the relation between X-ray (0.2-4 keV) and optical luminosities as log(LX/LB) ~ −4 (Fabbiano, 1992). This relation has been used when discussing the activity other than LMXBs (Iyomoto, 1996). However, spectral information of Einstein Observatory was rather poor above 3 keV, where LMXBs would emit significant energy flux. Therefore we performed ASCA observations of two normal spirals, NGC2903 and NGC628, in order to better calibrate the LX - LB relation.

Type
Session 1: Plasma and Fresh Nucleosynthesis Phenomena
Information
Symposium - International Astronomical Union , Volume 188: The Hot Universe , 1998 , pp. 284 - 285
Copyright
Copyright © Kluwer 1998 

References

Fabbiano, G. et al. 1992 ApJS 80 531 Google Scholar
Makishima, K. et al. 1989 PASJ 41 697 Google Scholar
Iyomoto, N. et al. 1996 PASJ 48 231 CrossRefGoogle Scholar
Tully, R.B. Nearby galaxies catalog (Cambridge Univ. Press)Google Scholar