Search Publications
Intermediate-mass black holes in Green pea galaxies (IMBH-GP) I: A candidate sample from LAMOST and SDSS
Jiang, Linhua; Zheng, Zhen-Ya; Wang, Jun-Xian +8 more
The scaling relation of central massive black holes (MBHs) and their host galaxies is well-studied for supermassive BHs (SMBHs, MBH ≥ 106M⊙). However, this relation has large uncertainties in the mass range of the intermediate-mass BHs (IMBHs, MBH ∼ 103–106M⊙). Since Gree…
More than softer-when-brighter: The X-ray powerlaw spectral variability in NGC 4051
Cai, Zheng; Kang, Jia-Lai; Cai, Zhen-Yi +3 more
The powerlaw X-ray spectra of active galactic nuclei at moderate to high accretion rates normally appear softer when they brighten, for which the underlying mechanisms are yet unclear. Utilizing XMM-Newton observations and excluding photons < 2 keV to avoid contamination from the soft excess, in this work we scrutinize the powerlaw spectral var…
Physics and astrophysics of strong magnetic field systems with eXTP
Paul, Biswajit; Feng, Hua; Göğüş, Ersin +38 more
In this paper we present the science potential of the enhanced X-ray Timing and Polarimetry (eXTP) mission for studies of strongly magnetized objects. We will focus on the physics and astrophysics of strongly magnetized objects, namely magnetars, accreting X-ray pulsars, and rotation powered pulsars. We also discuss the science potential of eXTP f…
Spatial distribution of metal emissions in supernova remnant 3C 397 viewed with Chandra and XMM
Chen, Yang; Jiang, Bing
We present X-ray equivalent width imaging of 3C 397 for Mg Heα, Si Heα, S Heα, and Fe Kα complex lines with Chandra and XMM-Newton observations. The images revealed that the heavier the element is, the smaller the extent of the element distribution is. The Mg emission is evidently enhanced in the southeastern blow-out region, well along the radio …
Discovery of a high confidence soft lag from an X-ray flare of Markarian 421
Zhang, Peng; Shao, Li; Zhang, YouHong +1 more
We present the X-ray variability properties of the X-ray and TeV bright blazar Mrk 421 with a ∼60 ks long XMM-Newton observation performed on November 9–10, 2005. The source experienced a pronounced flare, of which the inter-band time lags were determined with a very high confidence level. The soft (0.6–0.8 keV) X-ray variations lagged the hard (4…
Deprojection technique for galaxy cluster considering the point spread function
Chen, Yong; Wang, YuSa; Jia, ShuMei
We present a new method for the analysis of Abell 1835 observed by XMM-Newton. The method is a combination of the Direct Demodulation technique and deprojection. We eliminate the effects of the point spread function (PSF) with the Direct Demodulation technique. We then use a traditional deprojection technique to study the properties of Abell 1835.…