GINGA observations of three X-ray-luminous early-type galaxies : NGC 4472, NGC 4636, and NGC 3998
GINGA observations of three X-ray-luminous early-type galaxies : NGC 4472, NGC 4636, and NGC 3998
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GINGA 对三个 X 射线发光早期型星系的观测:NGC 4472、NGC 4636 和 NGC 3998
DOI:
10.1086/169542
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发表时间:
1991
期刊:
影响因子:
--
通讯作者:
T. Ohashi
中科院分区:
文献类型:
--
作者:
H. Awaki;K. Koyama;H. Kunieda;S. Takano;Y. Tawara;T. Ohashi
Observations of three X-ray luminous early-type galaxies, NGC 4472, NGC 4636 and NGC 3998, with the satellite Ginga, are presented. The X-ray spectra of NGC 4472 and NGC 4636 can be described as thermal emission from an optically thin plasma. The temperatures of the hot gas are determined. The X-ray spectrum of NGC 3998 is well fitted by a power-law model having a photon index of 2.0, the same sort of spectrum typical of AGN.