EINSTEIN-OBSERVATORY SSS AND MPC OBSERVATIONS OF THE COMPLEX-X-RAY SPECTRA OF SEYFERT-GALAXIES

被引:108
作者
TURNER, TJ
WEAVER, KA
MUSHOTZKY, RF
HOLT, SS
MADEJSKI, GM
机构
[1] UNIV SPACE RES ASSOC,WASHINGTON,DC
[2] UNIV MARYLAND,COLLEGE PK,MD 20742
关键词
GALAXIES; SEYFERT; X-RAYS; RADIATION MECHANISMS;
D O I
10.1086/170631
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We have reinvestigated the X-ray spectra of 25 Seyfert galaxies measured with the Solid State Spectrometer on the Einstein Observatory. This new investigation utilizes simultaneous data from the Monitor Proportional Counter, and automatic correction for systematic effects in the Solid State Spectrometer which were previously handled subjectively. We find that the best-fit single-power-law indices generally agree with those previously reported, but that soft excesses of some form are inferred for approximately 48% of the sources. One possible explanation of the soft excess emission is a blend of soft X-ray lines, centered around 0.8 keV. The implications of these results for accretion disk models are discussed.
引用
收藏
页码:85 / 100
页数:16
相关论文
共 58 条
[41]   COMPTON REFLECTION AND THE VARIABLE X-RAY-SPECTRUM OF NGC-5548 [J].
NANDRA, K ;
POUNDS, KA ;
STEWART, GC ;
GEORGE, IM ;
HAYASHIDA, K ;
MAKINO, F ;
OHASHI, T .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1991, 248 (04) :760-772
[42]   SOFT-X-RAY SPECTRAL OBSERVATIONS OF QUASARS AND HIGH X-RAY LUMINOSITY SEYFERT-GALAXIES [J].
PETRE, R ;
MUSHOTZKY, RF ;
KROLIK, JH ;
HOLT, SS .
ASTROPHYSICAL JOURNAL, 1984, 280 (02) :499-515
[43]   A COMPLETE X-RAY SAMPLE OF THE HIGH-LATITUDE (B-PARALLEL-TO-GREATER-THAN-20-DEGREES) SKY FROM HEAO-1 A-2 - LOG N-LOG S AND LUMINOSITY FUNCTIONS [J].
PICCINOTTI, G ;
MUSHOTZKY, RF ;
BOLDT, EA ;
HOLT, SS ;
MARSHALL, FE ;
SERLEMITSOS, PJ ;
SHAFER, RA .
ASTROPHYSICAL JOURNAL, 1982, 253 (02) :485-503
[44]   X-RAY SPECTRAL SIGNATURES OF VERY THICK COLD MATTER IN THE SPECTRA OF THE SEYFERT-1 GALAXIES NGC-7469 AND IC-4329A [J].
PIRO, L ;
YAMAUCHI, M ;
MATSUOKA, M .
ASTROPHYSICAL JOURNAL, 1990, 360 (02) :L35-L38
[45]  
PIRO L, 1991, IN PRESS P C IRON LI
[46]   RAPID X-RAY VARIABILITY OF THE SEYFERT-GALAXY MCG-6-30-15 [J].
POUNDS, KA ;
TURNER, TJ ;
WARWICK, RS .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1986, 221 (01) :P7-P12
[47]   X-RAY REFLECTION FROM COLD MATTER IN THE NUCLEI OF ACTIVE GALAXIES [J].
POUNDS, KA ;
NANDRA, K ;
STEWART, GC ;
GEORGE, IM ;
FABIAN, AC .
NATURE, 1990, 344 (6262) :132-133
[48]   THE SOFT-X-RAY SPECTRUM OF NGC-4151 [J].
POUNDS, KA ;
WARWICK, RS ;
CULHANE, JL ;
DEKORTE, PAJ .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1986, 218 (04) :685-694
[49]   SOFT-X-RAY SPECTRAL OBSERVATIONS OF LOW-LUMINOSITY ACTIVE GALAXIES [J].
REICHERT, GA ;
MUSHOTZKY, RF ;
PETRE, R ;
HOLT, SS .
ASTROPHYSICAL JOURNAL, 1985, 296 (01) :69-89
[50]  
ROTHSCHILD R, 1982, APJ, V254, P22