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21 papers · 2 filters
Chandra Survey of Nearby Galaxies: The Catalog
Rui She, Luis C. Ho, Hua Feng
We searched in the public archive of the Chandra X-ray Observatory as of March 2016 and assembled a sample of 719 galaxies within 50 Mpc with ACIS observations available. By cross-…
The (dark) halo-to-stellar mass ratio in the Spitzer Survey of Stellar Structure in Galaxies (SG)
Simón Díaz-García, Heikki Salo, Eija Laurikainen +1
We use 3.6 m photometry for 1154 disk galaxies () in the Spitzer Survey of Stellar Structure in Galaxies (SG, Sheth et al. 2010) to obtain the stellar compon…
Young star clusters in circumnuclear starburst rings
Richard de Grijs, Chao Ma, Siyao Jia +2
We analyse the cluster luminosity functions (CLFs) of the youngest star clusters in three galaxies exhibiting prominent circumnuclear starburst rings. We focus specifically on NGC…
The complex, dusty narrow-line region of NGC 4388: Gas-jet interactions, outflows, and extinction revealed by near-IR spectroscopy
A. Rodriguez-Ardila, R. E. Mason, L. Martins +14
We present Gemini/GNIRS spectroscopy of the Seyfert 2 galaxy NGC 4388, with simultaneous coverage from 0.85 - 2.5 m. Several spatially-extended emission lines are detected for t…
The Influence of Environment on the Chemical Evolution in Low-mass Galaxies
Yiqing Liu, Luis C. Ho, Eric Peng
The mean alpha-to-iron abundance ratio ([/Fe]) of galaxies is sensitive to the chemical evolution processes at early time, and it is an indicator of star formation timescale ($τ…
Improving the Flux Calibration in Reverberation Mapping by Spectral Fitting: Application to the Seyfert Galaxy MCG--6-30-15
Chen Hu, Jian-Min Wang, Luis C. Ho +4
We propose a method for the flux calibration of reverberation mapping spectra based on accurate measurement of [O III] emission by spectral fitting. The method can achieve…
Reverberation Mapping of the Broad-line Region in NGC 5548: Evidence for Radiation Pressure?
Kai-Xing Lu, Pu Du, Chen Hu +8
NGC 5548 is the best-observed reverberation-mapped active galactic nucleus with long-term, intensive monitoring. Here we report results from a new observational campaign between Ja…
Detection of Prominent Stellar Disks in the Progenitors of Present-day Massive Elliptical Galaxies
Roozbeh H. Davari, Luis C. Ho, Bahram Mobasher +1
Massive galaxies at higher redshifts ( 2) show different characteristics from their local counterparts: They are compact and most likely have a disk. In this study, w…
The Sloan Digital Sky Survey Reverberation Mapping Project: Biases in z>1.46 Redshifts due to Quasar Diversity
K. D. Denney, Keith Horne, W. N. Brandt +5
We use the coadded spectra of 32 epochs of Sloan Digital Sky Survey (SDSS) Reverberation Mapping Project observations of 482 quasars with z>1.46 to highlight systematic biases in t…
Measurement of the Black Hole Mass in NGC 1332 from ALMA Observations at 0.044 Arcsecond Resolution
Aaron J. Barth, Benjamin D. Boizelle, Jeremy Darling +4
We present Atacama Large Millimeter/submillimeter Array (ALMA) Cycle 3 observations of CO(2-1) emission from the circumnuclear disk in the E/S0 galaxy NGC 1332 at 0.044" resolution…
On the limits of measuring the bulge and disk properties of local and high-redshift massive galaxies
Roozbeh Davari, Luis C. Ho, Chien Y. Peng
A considerable fraction of the massive quiescent galaxies at \emph{z} 2, which are known to be much more compact than galaxies of comparable mass today, appear to have a…
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. V. A New Size-Luminosity Scaling Relation for the Broad-Line Region
Pu Du, Kai-Xing Lu, Zhi-Xiang Zhang +12
This paper reports results of the third-year campaign of monitoring super-Eddington accreting massive black holes (SEAMBHs) in active galactic nuclei (AGNs) between 2014-2015. Ten…
Chandra X-ray and Hubble Space Telescope Imaging of Optically Selected Kiloparsec-Scale Binary Active Galactic Nuclei II: Host Galaxy Morphology and AGN Activity
Jinyi Shangguan, Xin Liu, Luis C. Ho +4
Binary active galactic nuclei (AGNs) provide clues to how gas-rich mergers trigger and fuel AGNs and how supermassive black hole (SMBH) pairs evolve in a gas-rich environment. Whil…
Toward Precision Black Hole Masses with ALMA: NGC 1332 as a Case Study in Molecular Disk Dynamics
A. J. Barth, J. Darling, A. J. Baker +4
We present first results from a program of Atacama Large Millimeter/submillimeter Array (ALMA) CO(2-1) observations of circumnuclear gas disks in early-type galaxies. The program w…
Spectroscopic Indication for a Centi-parsec Supermassive Black Hole Binary in the Galactic Center of NGC 5548
Yan-Rong Li, Jian-Min Wang, Luis C. Ho +8
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 elude…
The Carnegie-Irvine Galaxy Survey. IV. A Method to Determine the Average Mass Ratio of Mergers That Built Massive Elliptical Galaxies
Song Huang, Luis C. Ho, Chien Y. Peng +2
Many recent observations and numerical simulations suggest that nearby massive, early-type galaxies were formed through a "two-phase" process. In the proposed second phase, the ext…
Low-Mass Active Galactic Nuclei with Rapid X-Ray Variability
Luis Ho, Minjin Kim
We present a detailed study of the optical spectroscopic properties of 12 active galactic nuclei (AGNs) with candidate low-mass black holes (BHs) selected by Kamizasa et al. throug…
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. VI. Velocity-resolved Reverberation Mapping of H Line
Pu Du, Kai-Xing Lu, Chen Hu +9
In the sixth of the series of papers reporting on a large reverberation mapping (RM) campaign of active galactic nuclei (AGNs) with high accretion rates, we present velocity-resolv…
The Sloan Digital Sky Survey Reverberation Mapping Project: Velocity Shifts of Quasar Emission Lines
Yue Shen, W. N. Brandt, Gordon T. Richards +9
Quasar emission lines are often shifted from the systemic velocity due to various dynamical and radiative processes in the line-emitting region. The level of these velocity shifts…
The Sloan Digital Sky Survey Reverberation Mapping Project: An Investigation of Biases in CIV Emission-Line Properties
K. D. Denney, Keith Horne, W. N. Brandt +6
We investigate the dependence on data quality of quasar properties measured from the CIV emission line region at high redshifts. Our measurements come from 32 epochs of Sloan Digit…
The Fundamental Plane of the Broad-line Region in Active Galactic Nuclei
Pu Du, Jian-Min Wang, Chen Hu +3
Broad emission lines in active galactic nuclei (AGNs) mainly arise from gas photoionized by continuum radiation from an accretion disk around a central black hole. The shape of the…