EXTREME-ULTRAVIOLET SPECTROSCOPY OF PKS 2155-304

被引：7
|
作者：
FRUSCIONE, A
BOWYER, S
KONIGL, A
KAHN, SM
机构：
[1] UNIV CALIF BERKELEY,DEPT ASTRON & ASTROPHYS,BERKELEY,CA 94720
[2] UNIV CHICAGO,DEPT ASTRON & ASTROPHYS,CHICAGO,IL 60637
[3] UNIV CHICAGO,SPACE SCI LAB,CHICAGO,IL 60637
来源：
ASTROPHYSICAL JOURNAL | 1994年 / 422卷 / 02期
关键词：
BL LACERTAE OBJECTS; INDIVIDUAL (PKS 2155-304); GALAXIES; INDIVIDUAL; PKS; 2155; 304; ISM; ABUNDANCES; ULTRAVIOLET; X-RAY;
D O I：
10.1086/187211
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the extreme ultraviolet (75-110 angstrom) spectrum of the BL Lac object PKS 2155-304, the first spectrum of an extragalactic source obtained with the Extreme Ultraviolet Explorer. The spectrum shows a generally smooth continuum, which can be modeled by a single power law plus interstellar absorption, and possibly an absorption feature at approximately 80 angstrom. The best fit to the data suggests that the EUV spectrum can be interpreted as a simple extrapolation of the X-ray continuum, with an energy index alpha almost-equal-to 1.6; however, shallower or steeper power laws with indices between -0.4 and 2.7 cannot be ruled out by the existing EUV data alone. The data provide strong constraints on the interstellar neutral H and He along the line of sight. Using a column density of 1.36 x 10(20) cm-2 for the Galactic neutral hydrogen along the PKS 2155-304 line of sight, the neutral helium column density is constrained to be 9%-10% of the hydrogen amount.
引用
收藏
页码：L55 / L58
页数：4
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