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NIR spectroscopic obs. of z>6.5 quasars
We report the results of near-infrared spectroscopic observations of 37 quasars in the redshift range 6.3<z<=7.64, including 32 quasars at z>6.5, forming the largest... -
Gravity Collective: counterpart to GrW190814
We present optical follow-up imaging obtained with the Katzman Automatic Imaging Telescope, Las Cumbres Observatory Global Telescope Network, Nickel Telescope, Swope Telescope,... -
Multiwavelength light curves of PG 1553+113
Blazar PG 1553+113 is thought to be a host of supermassive black hole binary system. A 2.2yr quasi-periodicity in the {gamma}-ray light curve was detected, possibly a result of... -
Radio luminous QSOs in SDSS DR14Q
While radio emission in quasars can be contributed to by a variety of processes (involving star-forming regions, accretion disk coronas and winds, and jets), the powering of the... -
Neutrinos in coincidence with GWs from LIGO/Virgo
The Super-Kamiokande detector can be used to search for neutrinos in time coincidence with gravitational waves detected by the LIGO-Virgo Collaboration (LVC). Both low-energy... -
HST obs. of supernova remnants in NGC6946
We constrained the progenitor masses for 169 supernova remnants (SNRs), eight historically observed supernovae (SNe), and the black hole formation candidate in NGC 6946, finding... -
GECKO follow-up obs. of 3 binary BH GW events
We present optical follow-up observation results of three binary black hole merger (BBH) events, GW190408_181802, GW190412, and GW190503_185404, which were detected by the... -
Swift & Fermi GRBs with LIGO-Virgo run O3a data
We search for gravitational-wave transients associated with gamma-ray bursts (GRBs) detected by the Fermi and Swift satellites during the first part of the third observing run... -
Limits on SMBH binaries from NANOGrav
Supermassive black hole binaries (SMBHBs) should form frequently in galactic nuclei as a result of galaxy mergers. At subparsec separations, binaries become strong sources of... -
A value-added catalog for SDSS DR16 quasars at z<0.7
We revisit the dependence of the covering factor (CF) of dust torus on physical properties of active galactic nuclei (AGNs) by taking into account an AGN polar dust emission.... -
StrayCats: NuSTAR stray light obs.
We present StrayCats, a catalog of Nuclear Spectroscopic Telescope ARray (NuSTAR) stray light observations of X-ray sources. Stray light observations arise for sources... -
Monitoring AGNs with H{beta} Asymmetry. II.
We report the results of reverberation mapping of three bright Seyfert galaxies, Mrk 79, NGC 3227, and Mrk 841, from a campaign conducted from 2016 December to 2017 May with the... -
Extreme variability QSOs from SDSS DR16
We perform a systematic search for high-redshift (z>1.5) extreme variability quasars (EVQs) using repeat spectra from the Sixteenth Data Release of the Sloan Digital Sky... -
X-SHOOTER/ALMA QSOs at 5.78<z<7.54. I. NIR sp.
We present X-SHOOTER near-IR spectroscopy of a large sample of 38 luminous (M_1450_=-29.0 to -24.4) quasars at 5.78<z<7.54, which have complementary [CII]158{mu}m... -
ZTF candidate counterparts to 13 GW follow-up
We present a systematic search for optical counterparts to 13 gravitational wave (GW) triggers involving at least one neutron star during LIGO/Virgo's third observing run (O3).... -
X-ray mass segregation effect in GCs. IV.
Using X-ray sources as sensitive probes of stellar dynamical interactions in globular clusters (GCs), we study the mass segregation and binary burning processes in {omega}Cen.... -
Properties of 68 active galactic nuclei
The usage of the radius-luminosity (R-L) relation for the determination of black hole masses across the cosmic history, as well as its application for cosmological studies,... -
SDSS Hbeta & C^IV^ reverberation mapped AGNs
It is well known that reverberation mapping of active galactic nuclei (AGNs) reveals a relationship between AGN luminosity and the size of the broad-line region, and that use of... -
Supermassive BH masses of reverberation-mapped AGNs
Using different kinds of velocity tracers derived from the broad H{beta} profile (in the mean or rms spectrum) and the corresponding virial factors f, the central supermassive... -
TESS light curve of AGN NGC 4395
We present optical light curves from the Transiting Exoplanet Survey Satellite (TESS) for the archetypical dwarf active galactic nucleus (AGN) in the nearby galaxy NGC 4395...
