161 citations · 382 across the 9 of their papers we have counts for
8 papers
An X-ray Luminosity-dependent "Changing-look" Phenomenon in UGC 3223
J. Wang, D. W. Xu, J. Y. Wei
The nature of the rare "Changing-look" (CL) phenomenon in active galactic nuclei (AGNs) is still under debate at current stage. We here present \it Swift/\rm XRT and UVOT follow-up…
Suspended and restored activities of A Nearby Super Massive Black Hole
J. Wang, D. W. Xu, S. S. Sun +4
The discovery of spectral type transition of active galactic nuclei (AGNs), the so-called changing-look(CL) phenomenon, challenges the widely accepted AGN paradigm, not only in the…
A Study of Outflows in Luminous Quasars at Redshift
J. Wang, D. W. Xu, J. Y. Wei
We perform a systematic study of outflow in the narrow-line region (NLR) of active galactic nuclei (AGNs) at basing upon a large sample of quasars at $z\si…
Metallicity from Type II Supernovae from the (i)PTF
F. Taddia, P. Moquist, J. Sollerman +13
Type IIP supernovae (SNe IIP) have recently been proposed as metallicity () probes. The spectral models of Dessart et al. (2014) showed that the pseudo-equivalent width of Fe II…
NTT, Spitzer and Chandra spectroscopy of SDSSJ095209.56+214313.3: the most luminous coronal-line supernova ever observed, or a stellar tidal disruption event ?
S. Komossa, H. Zhou, A. Rau +9
The galaxy SDSSJ0952+2143 showed remarkable emission-line properties first reported in 2008 (paper I), which are the consequence of a powerful high-energy flare. Here we report fol…
Discovery of superstrong, fading, iron line emission and double-peaked Balmer lines of the galaxy SDSSJ0952+2143 - the light echo of a huge flare
S. Komossa, H. Zhou, T. Wang +9
We report the discovery of superstrong, fading, high-ionization iron line emission in the galaxy SDSSJ095209.56+214313.3 (SDSSJ0952+2143 hereafter), which must have been caused by…