期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 453, 期 3, 页码 2558-2568出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stv1826
关键词
line: identification; galaxies: active; galaxies: individual: NGC 1365; X-rays: galaxies
资金
- STFC [ST/J001384/1]
- Chandra award [GO2-13123A]
- STFC [ST/J001384/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/J001384/1] Funding Source: researchfish
We present the analysis of a Chandra High-Energy Transmission Grating (HETG) observation of the local Seyfert galaxy NGC 1365. The source, well known for its dramatic X-ray spectral variability, was caught in a reflection-dominated, Compton-thick state. The high spatial resolution afforded by Chandra allowed us to isolate the soft X-ray emission from the active nucleus, neglecting most of the contribution from the kpc-scale starburst ring. The HETG spectra thus revealed a wealth of He-and H-like lines from photoionized gas, whereas in larger aperture observations these are almost exclusively produced through collisional ionization in the circumnuclear environment. Once the residual thermal component is accounted for, the emission-line properties of the photoionized region close to the hard X-ray continuum source indicate that NGC 1365 has some similarities to the local population of obscured active galaxies. In spite of the limited overall data quality, several soft X-ray lines seem to have fairly broad profiles (similar to 800-1300 km s(-1) full width at half-maximum), and a range of outflow velocities (up to similar to 1600 km s(-1), but possibly reaching a few thousand km s(-1)) appears to be involved. At higher energies, the K alpha fluorescence line from neutral iron is resolved with >99 per cent confidence, and its width of similar to 3000 km s(-1) points to an origin from the same broad-line region clouds responsible for eclipsing the X-ray source and likely shielding the narrow-line region.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据