The variability of hardness ratio 1 observed by ROSAT: Narrow-line seyfert 1 galaxies versus broad-line Seyfert 1 galaxies

被引：10

作者：

Cheng, LP ^{[1
]}

Wei, JY ^{[1
]}

Zhao, YH ^{[1
]}

机构：

[1] Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China

来源：

CHINESE JOURNAL OF ASTRONOMY AND ASTROPHYSICS | 2002年 / 2卷 / 03期

关键词：

galaxies : Seyfert; galaxies : active; X-ray : galaxies;

D O I：

10.1088/1009-9271/2/3/207

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We examined the correlation between the ROSAT Hardness Ratio 1 and Count Rates eight Narrow-line Seyfert 1 Galaxies (NLS1s) and 14 Broad-line Seyfert1 Galaxies (BLS1s). We found that six of the NLS1s show a positive HR1-CTs correlation, and seven of the BLS1s, a negative correlation. The other two NLS1s and seven BLS1s do not show any clear HR1-CTs correlation. Thus, the spectral behavior is statistically different for the NLS1s and BLS1s. The different behaviors can possibly be interpreted in terms of a stable 'soft excess' that is strong in NLS1s and weak in BLS1s, plus a power law component, common to both, which softens with increasing flux.

引用

页码：207 / 215

页数：9

共 24 条

[1]

Boller T, 1996, ASTRON ASTROPHYS, V305, P53

[2]

Boller T, 1997, MON NOT R ASTRON SOC, V289, P393

[3]

BOLLER T, 1999, JOINT MPE AIP ESO WO

[4] ROSAT High-Resolution Imager monitoring of extreme X-ray variability in the narrow-line quasar PHL 1092 [J].

Brandt, WN ;

Boller, T ;

Fabian, AC ;

Ruszkowski, M .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1999, 303 (04) :L53-L57

[5] THE BEHAVIOR OF COMPACT NON-THERMAL SOURCES WITH PAIR PRODUCTION [J].

DONE, C ;

FABIAN, AC .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1989, 240 (01) :81-102

[6] XMM-Newton monitoring of X-ray variability in the quasar PKS 0558-504 [J].

Gliozzi, M ;

Brinkmann, W ;

O'Brien, PT ;

Reeves, JN ;

Pounds, KA ;

Trifoglio, M ;

Gianotti, F .

ASTRONOMY & ASTROPHYSICS, 2001, 365 (01) :L128-L133

[7]

Grupe D, 2000, ASTRON ASTROPHYS, V356, P11

[8]

GRUPE D, 1996, THESIS U GOTTINGEN

[9] X-RAY SPECTRAL VARIABILITY OF THE SEYFERT-1 GALAXY NGC-4051 [J].

KUNIEDA, H ;

HAYAKAWA, S ;

TAWARA, Y ;

KOYAMA, K ;

TSURUTA, S ;

LEIGHLY, K .

ASTROPHYSICAL JOURNAL, 1992, 384 (02) :482-490

[10] THE SOFT-X-RAY PROPERTIES OF A COMPLETE SAMPLE OF OPTICALLY SELECTED QUASARS .1. FIRST RESULTS [J].

LAOR, A ;

FIORE, F ;

ELVIS, M ;

WILKES, BJ ;

MCDOWELL, JC .

ASTROPHYSICAL JOURNAL, 1994, 435 (02) :611-630

← 1 2 3 →