A5103086180- Astrophysical Phenomena and Observations
- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Ion-surface interactions and analysis
- Extraction and Separation Processes
- Astro and Planetary Science
- Mass Spectrometry Techniques and Applications
- Metal Extraction and Bioleaching
- Geophysics and Gravity Measurements
- Recycling and Waste Management Techniques
- Methane Hydrates and Related Phenomena
- Influenza Virus Research Studies
Chinese Academy of Sciences
2015-2018
Yunnan Observatories
2018
Beijing Normal University
2014-2016
Institute of High Energy Physics
2015-2016
We report first results from a large project to measure black hole (BH) mass in high accretion rate active galactic nuclei (AGNs). Such objects may be different other AGNs being powered by slim disks and showing saturated luminosities, but both are not yet fully understood. The part of reverberation mapping (RM) campaign using the 2.4-m Shangri-La telescope at Yunnan Observatory China. goals investigate gas distribution near BH properties central disks, Eddington ratios, test feasibility...
We have completed two years of photometric and spectroscopic monitoring a large number active galactic nuclei (AGNs) with very high accretion rates. In this paper, we report on the result second phase campaign, during 2013–2014, measurements five new Hβ time lags out eight monitored AGNs. All objects were identified as super-Eddington accreting massive black holes (SEAMBHs). The highest measured rates for in campaign are , where is mass rates, Eddington luminosity c speed light. find that...
Abstract As one paper in a series reporting on large reverberation mapping campaign of super-Eddington accreting massive black holes (SEAMBHs) active galactic nuclei (AGNs), we present the results 10 SEAMBHs monitored spectroscopically during 2015–2017. Six them are observed for first time, and have generally higher 5100 Å luminosities than our from 2012 to 2015; remaining four repeat observations check if their previous lags change. Similar SEAMBHs, H β time newly objects shorter values...
This paper reports results of the third-year campaign monitoring super-Eddington accreting massive black holes (SEAMBHs) in active galactic nuclei (AGNs) between 2014-2015. Ten new targets were selected from quasar sample Sloan Digital Sky Survey (SDSS), which are generally more luminous than SEAMBH candidates last two years. H$\beta$ lags ($\tau_{_{\rm H\beta}}$) five 10 quasars have been successfully measured this season. We find that shorter, by large factors, those objects with same...
This is the second in a series of papers reporting on large reverberation mapping (RM) campaign to measure black hole (BH) mass high accretion rate active galactic nuclei (AGNs). The goal identify super-Eddington accreting massive holes (SEAMBHs) and use their unique properties construct new method for measuring cosmological distances. Based theoretical models, saturated bolometric luminosity such sources proportional BH mass, which can be used obtain distance. Here we report five RM...
ABSTRACT In the sixth of a series papers reporting on large reverberation mapping (RM) campaign active galactic nuclei (AGNs) with high accretion rates, we present velocity-resolved time lags H β emission lines for nine objects observed in during 2012–2013. order to correct line broadening caused by seeing and instruments before analyzing RM, adopt Richardson–Lucy deconvolution reconstruct their profiles. The validity effectiveness are checked using Monte Carlo simulation. Five among show...
ABSTRACT As a natural consequence of cosmological hierarchical structure formation, sub-parsec supermassive black hole binaries (SMBHBs) should be common in galaxies but thus far have eluded spectroscopic identification. Based on four decades optical monitoring, we report that the nucleus NGC 5548, nearby Seyfert galaxy long suspected to experienced major merger about 1 billion yr ago, exhibits long-term variability with period ∼14 continuum and broad H β emission line. Remarkably,...
This is the third in a series of papers reporting on large reverberation-mapping campaign aimed to study properties active galactic nuclei (AGNs) with high accretion rates. We present new results variability optical Fe II emission lines 10 AGNs observed by Yunnan Observatory 2.4m telescope during 2012--2013. detect statistically significant time lags, relative AGN continuum, nine sources. accurate measurement achieved using sophisticated spectral fitting scheme that allows for apparent flux...
Broad emission lines of active galactic nuclei (AGNs) originate from the broad-line region (BLR), consisting dense gas clouds in orbit around an accreting supermassive black hole. Understanding geometry and kinematics is crucial for gaining insights into physics evolution AGNs. Conventional velocity-resolved reverberation mapping may face challenges disentangling degeneracy between intricate motion this region. To address challenge, new key constraints are required. Here, we report discovery...
Abstract This is the eighth in a series of papers reporting on large reverberation mapping (RM) campaign to measure black hole (BH) mass active galactic nuclei with high accretion rates. We employ recently developed dynamical modeling approach for broad-line regions (BLRs) based method Pancoast et al. analyze RM data set Mrk 142 observed first monitoring season. In this approach, continuum variations are reconstructed using damped random walk process, and BLR structure delineated flexible...
Abstract As one of a series papers reporting on large reverberation mapping campaign, we apply the maximum entropy method (MEM) to nine narrow-line Seyfert 1 galaxies with super-Eddington accretion rates observed during 2012–2013 for velocity-delay maps their H β and γ emission lines. The six objects are reliably reconstructed using MEM. lines Mrk 335 indicate that gas its broad-line region (BLR) is infalling. For 142, show signatures outflow. 1044 demonstrate complex kinematics—a virialized...
ABSTRACT We propose a method for the flux calibration of reverberation mapping spectra, based on accurate measurement [O iii ] λ 5007 emission by spectral fitting. Our can achieve better accuracy than traditional Groningen & Wanders, allowing measurements objects with variability amplitudes as low ∼5%. As demonstration, we reanalyze data Seyfert 1 galaxy MCG–6-30-15, taken from 2008 campaign Lick active galactic nucleus monitoring project, which previously failed to obtain time lag this...
Graham et al. found a sample of active galactic nuclei (AGNs) and quasars from the Catalina Real-time Transient Survey (CRTS) that have long-term periodic variations in optical continuum, nature periodicity remains uncertain. We investigate variability characteristics by testing relations observed periods with AGN luminosity, black hole mass accretion rates, find no significant correlations. also test several different aspects related to disks surrounding single holes, such as Keplerian...
We present optical spectroscopic and photometric observations of the nearby type Ic supernova (SN Ic) SN 2014L. This was discovered by Tsinghua-NAOC Transient Survey (TNTS) in type-Sc spiral galaxy M99 (NGC 4254). Fitting to early-time light curve indicates that 2014L detected at only a few hours after shock breakout, it reached peak brightness $M_{\rm V} = -17.73 \pm 0.28$ mag ($L= [2.06\pm 0.50] \times 10^{42}$ erg s$^{-1}$) approximately 13 days later. shows close resemblance 2007gr...
We present a novel multimodal neural network for classifying astronomical sources in multiband ground-based observations, from optical to near infrared, separate stars, galaxies and quasars. Our approach combines convolutional branch learning morphological features $r$-band images with an artificial extracting spectral energy distribution (SED) information. Specifically, we have used 9-band ($ugri$) NIR ($ZYHJK_s$) data the Kilo-Degree Survey (KiDS) Data Release 5. The two branches of are...