RAPID VARIABILITY OF THE IRON FLUORESCENCE LINE FROM THE SEYFERT-1 GALAXY NGC6814

被引：68

作者：

KUNIEDA, H ^{[1
]}

TURNER, TJ ^{[1
]}

AWAKI, H ^{[1
]}

KOYAMA, K ^{[1
]}

MUSHOTZKY, R ^{[1
]}

TSUSAKA, Y ^{[1
]}

机构：

[1] NASA,GODDARD SPACE FLIGHT CTR,GREENBELT,MD 20771

来源：

NATURE | 1990年 / 345卷 / 6278期

关键词：

D O I：

10.1038/345786a0

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

LUMINOUS broad-band emission from active galactic nuclei (AGN) is thought to be due to accretion onto a massive black hole. Because X-ray emission shows variability on a faster time-scale than any other wavelength band that has been observed it is assumed to be produced very close to the central energy source. Observations of AGN with the 4,000-cm2 Large Area Counters (LACs) aboard the Ginga satellite have obtained the highest quality data on X-ray variability to date, allowing examination of detailed spectra up to 20 keV in energy on relatively short time-scales1. We have observed NGC6814, one of the faster2 X-ray-variable AGN (δt < 200 s), with Ginga to obtain data on the variability of the iron fluorescence line, and thus to constrain the distribution of cold gas from which the line originates. A positive correlation measured between the variability of the iron-line flux and the continuum emission suggests an upper limit of 1013 cm for the size of the iron reprocessing region. © 1990 Nature Publishing Group.

引用

页码：786 / 788

页数：3

共 14 条

[1] X-RAY-FLUORESCENCE FROM THE INNER DISK IN CYGNUS X-1 [J].