AXJ1749+684: a narrow-emission-line galaxy with a flat X-ray spectrum

被引：16

作者：

Iwasawa, K ^{[1
]}

Fabian, AC ^{[1
]}

Brandt, WN ^{[1
]}

Crawford, CS ^{[1
]}

Almaini, O ^{[1
]}

机构：

[1] HARVARD SMITHSONIAN CTR ASTROPHYS,CAMBRIDGE,MA 02138

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1997年 / 291卷 / 01期

关键词：

galaxies: active; galaxies: individual: AXJ1749+684; X-rays: galaxies;

D O I：

10.1093/mnras/291.1.L17

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the serendipitous detection of an X-ray source, AX J1749+684, with the ASCA Gas Imaging Spectrometer. AXJ1749+684 is identified with a LINER/starburst-type spiral galaxy KUG 1750+683A at a redshift z = 0.05. It has a hard X-ray spectrum, consistent with that of the X-ray background (XRB) in the 1-10 keV band. Despite the optical classification, the X-ray luminosity cannot be explained by starburst activity. Combined with spatial variations in the optical emission-line ratios, this suggests the presence of an obscured Seyfert nucleus embedded within a star-forming galaxy. Similar behaviour could explain the ambiguous properties of the faint narrow-line X-ray galaxies (NLXGs) emerging from deep X-ray surveys.

引用

页码：L17 / L22

页数：6

共 30 条

[11] STAR-FORMING GALAXIES AND THE X-RAY-BACKGROUND [J].

GRIFFITHS, RE ;

PADOVANI, P .

ASTROPHYSICAL JOURNAL, 1990, 360 (02) :483-489

[12]

Hasinger G., 1996, ASTRON ASTROPHYS, V120, P607

[13]

IWASAWA K, 1997, IN PRESS MNRAS

[14]

KII T, 1996, XRAY IMAGING SPECTRO, P161

[15] A SENSITIVE 1.5 GHZ RADIO SURVEY AROUND THE NORTH ECLIPTIC POLE [J].

KOLLGAARD, RI ;

BRINKMANN, W ;

CHESTER, MM ;

FEIGELSON, ED ;

HERTZ, P ;

REICH, P ;

WIELEBINSKI, R .

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 1994, 93 (01) :145-159

[16] OBSCURATION AND THE VARIOUS KINDS OF SEYFERT-GALAXIES [J].

LAWRENCE, A ;

ELVIS, M .

ASTROPHYSICAL JOURNAL, 1982, 256 (02) :410-426

[17]

MADAU P, 1994, MNRAS, V270, P17

[18]

MCCARTHY PJ, 1987, ASTRON J, V92, P264

[19]

MCHARDY I, 1995, SPECTRUM-J STATE GOV, V6, P11

[20]

MCHARDY IM, 1997, UNPUB MNRAS

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