Liming Dou - Yunnan Observatory

Liming Dou
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Liming Dou
Yunnan Observatory

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High Energy Astrophysical Phenomena (5)
Astrophysics (2)
Astrophysics of Galaxies (2)
Earth and Planetary Astrophysics (1)

Publications Authored By Liming Dou

We present the mid-infrared light curves (LC) of a tidal disruption event (TDE) candidate in the center of a nearby ultraluminous infrared galaxy (ULIRG) F01004-2237 using archival WISE and NEOWISE data with time span of 2010 to 2016. At the peak of the optical flare, F01004-2237 is IR quiescent. About 3 years later, its mid-IR fluxes show steady increase, rising by 1. Read More

We present a statistical analysis of the variability of broad absorption lines (BALs) in quasars using the large multi-epoch spectroscopic dataset of the Sloan Digital Sky Survey Data Release 12 (SDSS DR12). We divide the sample into two groups according to the pattern of the variation of C iv BAL with respect to that of continuum: the equivalent widths (EW) of the BAL decreases (increases) when the continuum brightens (dims) as group T1; and the variation of EW and continuum in the opposite relation as group T2. We find that T2 has significantly (P_T<10-6 , Students T Test) higher EW ratios (R) of Si iv to C iv BAL than T1. Read More

The sporadic accretion following the tidal disruption of a star by a super-massive black hole (TDE) leads to a bright UV and soft X-ray flare in the galactic nucleus. The gas and dust surrounding the black hole responses to such a flare with an echo in emission lines and infrared emission. In this paper, we report the detection of long fading mid-IR emission lasting up to 14 years after the flare in four TDE candidates with transient coronal lines using the WISE public data release. Read More

We report the detection of a significant infrared variability of the nearest tidal disruption event (TDE) ASASSN-14li using Wide-field Infrared Survey Explorer} and newly released Near-Earth Object WISE Reactivation} data. In comparison with the quiescent state, the infrared flux is brightened by 0.12 and 0. Read More

We present an analysis of spectrum and variability of the bright reddened narrow line Seyfert 1 galaxy Was~61 using 90 ks archival {\it XMM-Newton} data. The X-ray spectrum in 0.2-10 keV can be characterized by an absorbed power-law plus soft excess and an Fe K$\alpha$ emission line. Read More

We present a new short-period brown dwarf candidate around the star TYC 1240-00945-1. This candidate was discovered in the first year of the Multi-object APO Radial Velocity Exoplanets Large-area Survey (MARVELS), which is part of the third phase of the Sloan Digital Sky Survey (SDSS-III), and we designate the brown dwarf as MARVELS-1b. MARVELS uses the technique of dispersed fixed-delay interferometery to simultaneously obtain radial velocity measurements for 60 objects per field using a single, custom-built instrument that is fiber fed from the SDSS 2. Read More

Affiliations: 1Yunnan Observatory, 2USTC, 3USTC, 4USTC, 5USTC, 6USTC, 7USTC, 8USTC, 9Yunnan Observatory
Category: Astrophysics

This proceedings contribution summarizes first results obtained from a systematic study of 2011 NLS1 galaxies, as presented in Zhou et al. (2006, ApJS 166, 128). The sample was compiled by examining the spectral parameters of galaxies and QSOs derived from SDSS DR3 data. Read More

Affiliations: 1University of Science and Technology of China, 2University of Science and Technology of China, 3National Astronomical Observatories/Yunnan Observatory, 4National Astronomical Observatories/Yunnan Observatory, 5University of Science and Technology of China, 6University of Science and Technology of China, 7National Astronomical Observatories/Yunnan Observatory, 8University of Science and Technology of China, 9University of Science and Technology of China, 10University of Science and Technology of China
Category: Astrophysics

We report the discovery of a dwarf Seyfert 1 active galactic nucleus (AGN) with a candidate intermediate-mass black hole hosted by the dwarf galaxy SDSS J160531.84+174826.1 at z=0. Read More