RXTE observations of Seyfert 2 galaxies:: evidence for spectral variability

被引：9

作者：

Georgantopoulos, I ^{[1
]}

Papadakis, IE

机构：

[1] Natl Observ Athens, Inst Astron & Astrophys, Athens 15236, Greece

[2] Univ Crete, Dept Phys, Heraklion 71003, Greece

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2001年 / 322卷 / 02期

关键词：

galaxies : active; galaxies : individual : ES0103-G35; galaxies : individual : IC5063; galaxies : individual : NGC 4507; galaxies : individual : NGC 7172; X-rays : galaxies;

D O I：

10.1046/j.1365-8711.2001.04059.x

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a series of RXTE observations of the nearby obscured Seyfert galaxies ESO103-G35, IC5063, NGC 4507 and NGC 7172. The period of monitoring ranges from seven days for NGC 7172 up to about seven months for ESO103-G035. The spectra of all galaxies fit well with a highly obscured (N-H > 10(23) cm(-2)) power-law and an Fe line at 6.4 keV. We find strong evidence for the presence of a reflection component in ESO103-G35 and NGC 4507. The observed flux presents strong variability on day time-scales in all objects. Spectral variability is also detected in the sense that the spectrum steepens with increasing flux similar to the behaviour witnessed in some Seyfert 1 galaxies.

引用

页码：218 / 230

页数：13

共 41 条

[1]

AKYLAS A, 2001, IN PRESS MNRAS

[2] SPECTROPOLARIMETRY AND THE NATURE OF NGC-1068 [J].

ANTONUCCI, RRJ ;

MILLER, JS .

ASTROPHYSICAL JOURNAL, 1985, 297 (02) :621-632

[3]

BASSANI L, 1995, APJ, V444, pL72

[4] IC-5063 - A MERGER REMNANT WITH A HIDDEN LUMINOUS ACTIVE NUCLEUS [J].

COLINA, L ;

SPARKS, WB ;

MACCHETTO, F .

ASTROPHYSICAL JOURNAL, 1991, 370 (01) :102-+

[5] On the nature of the X-ray absorption in the Seyfert 2 galaxy NGC 4507 [J].

Comastri, A ;

Vignali, C ;

Cappi, M ;

Matt, G ;

Audano, R ;

Awaki, H ;

Ueno, S .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1998, 295 (02) :443-450

[6]

DURRET F, 1986, ASTRON ASTROPHYS, V156, P51

[7] The X-ray spectra and spectral variability of intermediate-type Seyfert galaxies:: ASCA observations of NGC 4388 and ESO 103-G35 [J].

Forster, K ;

Leighly, KM ;

Kay, LE .

ASTROPHYSICAL JOURNAL, 1999, 523 (02) :521-539

[8] RXTE monitoring observations of Markarian 3 [J].

Georgantopoulos, I ;

Papadakis, I ;

Warwick, RS ;

Smith, DA ;

Stewart, GC ;

Griffiths, RG .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1999, 307 (04) :815-820

[9] X-RAY REFLECTION FROM COLD MATTER IN ACTIVE GALACTIC NUCLEI AND X-RAY BINARIES [J].

GEORGE, IM ;

FABIAN, AC .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1991, 249 (02) :352-367

[10] THE CONTRIBUTION OF THE OBSCURING TORUS TO THE X-RAY-SPECTRUM OF SEYFERT-GALAXIES - A TEST FOR THE UNIFICATION MODEL [J].

GHISELLINI, G ;

HAARDT, F ;

MATT, G .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1994, 267 (03) :743-754

← 1 2 3 4 5 →