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
收藏
页码：L17 / L22
页数：6
相关论文
共 30 条
  • [1] A deep ROSAT survey .12. The X-ray spectra of faint ROSAT sources
    Almaini, O
    Shanks, T
    Boyle, BJ
    Griffiths, RE
    Roche, N
    Stewart, GC
    Georgantopoulos, I
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1996, 282 (01) : 295 - 303
  • [2] SURVEY OF INTER-STELLAR H-I FROM L-ALPHA ABSORPTION-MEASUREMENTS .2.
    BOHLIN, RC
    SAVAGE, BD
    DRAKE, JF
    [J]. ASTROPHYSICAL JOURNAL, 1978, 224 (01) : 132 - 142
  • [3] THE CAMBRIDGE-CAMBRIDGE ROSAT SERENDIPITY SURVEY .1. X-RAY-LUMINOUS GALAXIES
    BOYLE, BJ
    MCMAHON, RG
    WILKES, BJ
    ELVIS, M
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1995, 272 (02) : 462 - 468
  • [4] The ROSAT UK Medium Sensitivity Survey: Optical identification and relation to X-ray spectral properties
    Carballo, R
    Warwick, RS
    Barcons, X
    GonzalezSerrano, JI
    Barber, CR
    MartinezGonzalez, E
    PerezFournon, I
    Burgos, J
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1995, 277 (04) : 1312 - 1326
  • [5] ASCA and ROSAT observations of the QSF3 field: The x-ray background in the 0.1-7 keV band
    Chen, LW
    Fabian, AC
    Gendreau, KC
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1997, 285 (03) : 449 - 471
  • [6] COMASTRI A, 1995, ASTRON ASTROPHYS, V296, P1
  • [7] The circumnuclear region in the Seyfert 1 galaxy NGC 3227
    Delgado, RMG
    Perez, E
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1997, 284 (04) : 931 - 945
  • [8] GENDREAU KC, 1995, PUBL ASTRON SOC JPN, V47, pL5
  • [9] GOTTHELF E, 1996, ASCA NEWS, V4, P31
  • [10] A deep ROSAT survey .10. X-ray-luminous narrow-emission-line galaxies
    Griffiths, RE
    DellaCeca, R
    Georgantopoulos, I
    Boyle, BJ
    Stewart, GC
    Shanks, T
    Fruscione, A
    [J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1996, 281 (01) : 71 - 83
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