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34 papers · 2 filters
On the Connection Between Spiral Arm Pitch Angle and Galaxy Properties
Si-Yue Yu, Luis C. Ho
We measure the pitch angle () of spiral arms in a sample of 79 galaxies to perform a systematic study of the dependence of on galaxy morphology, mass, and kinematics to inve…
NuSTAR Hard X-ray View of Low-luminosity Active Galactic Nuclei: High-energy Cutoff and Truncated Thin Disk
George Younes, Andrew Ptak, Luis C. Ho +5
We report the analysis of simultaneous XMM-Newton+NuSTAR observations of two low-luminosity Active Galactic Nuclei (LLAGN), NGC 3998 and NGC 4579. We do not detect any significant…
Supermassive Black Holes with High Accretion Rates in Active Galactic Nuclei. VIII. Structure of the Broad-Line Region and Mass of the Central Black Hole in Mrk 142
Yan-Rong Li, Yu-Yang Songsheng, Jie Qiu +9
This is the eighth in a series of papers reporting on a large reverberation mapping campaign to measure black hole (BH) mass in high accretion rate active galactic nuclei (AGNs). W…
Interstellar Medium and Star Formation of Starburst Galaxies on the Merger Sequence
Jinyi Shangguan, Luis C. Ho, Ruancun Li +3
The interstellar medium is a key ingredient that governs star formation in galaxies. We present a detailed study of the infrared (~ 1-500 micron) spectral energy distributions of a…
The Formation of Compact Elliptical Galaxies in The Vicinity of A Massive Galaxy: The Role of Ram-pressure Confinement
Min Du, Victor P. Debattista, Luis C. Ho +9
Compact ellipticals (cEs) are outliers from the scaling relations of early-type galaxies, particularly the mass-metallicity relation which is an important outcome of feedback. The…
Kinematics of the Broad-line Region of 3C 273 from a Ten-year Reverberation Mapping Campaign
Zhi-Xiang Zhang, Pu Du, Paul S. Smith +9
Despite many decades of study, the kinematics of the broad-line region of 3C~273 are still poorly understood. We report a new, high signal-to-noise, reverberation mapping campaign…
Monitoring AGNs with Hβ Asymmetry. I. First Results: Velocity-resolved Reverberation Mapping
Pu Du, Michael S. Brotherton, Kai Wang +12
We have started a long-term reverberation mapping project using the Wyoming Infrared Observatory 2.3 meter telescope titled "Monitoring AGNs with Hβ Asymmetry" (MAHA). The motivati…
The Effect of Galaxy Interactions on Molecular Gas Properties
Hsi-An Pan, Lihwai Lin, Bau-Ching Hsieh +26
Galaxy interactions are often accompanied by an enhanced star formation rate (SFR). Since molecular gas is essential for star formation, it is vital to establish whether, and by ho…
Dependence of Spiral Arms Pitch Angle on Wavelength as a Test of Density Wave Theory
Si-Yue Yu, Luis C. Ho
Large-scale galactic shocks, predicted by density wave theory, trigger star formation (SF-arms) downstream from the potential of the oldest stars (P-arms), resulting in a color jum…
A Giant Protocluster of Galaxies at Redshift 5.7
Linhua Jiang, Jin Wu, Fuyan Bian +14
Galaxy clusters trace the largest structures of the Universe and provide ideal laboratories for studying galaxy evolution and cosmology. Clusters with extended X-ray emission have…
KMTNet Nearby Galaxy Survey I. : Optimal strategy for low surface brightness imaging with KMTNet
Woowon Byun, Yun-Kyeong Sheen, Luis C. Ho +8
In hierarchical galaxy formation models, galaxies evolve through mergers and accretions. Tidally-disrupted debris from these processes can remain as diffuse, faint structures, whic…
The Sloan Digital Sky Survey Reverberation Mapping Project: Sample Characterization
Yue Shen, Patrick B. Hall, Keith Horne +24
We present a detailed characterization of the 849 broad-line quasars from the Sloan Digital Sky Survey Reverberation Mapping (SDSS-RM) project. Our quasar sample covers a redshift…
JINGLE, a JCMT legacy survey of dust and gas for galaxy evolution studies: I. Survey overview and first results
Amelie Saintonge, Christine D. Wilson, Ting Xiao +88
JINGLE is a new JCMT legacy survey designed to systematically study the cold interstellar medium of galaxies in the local Universe. As part of the survey we perform 850um continuum…
The Widespread Presence of Nanometer-size Dust Grains in the Interstellar Medium of Galaxies
Yanxia Xie, Luis C. Ho, Aigen Li +1
Interstellar dust spans a wide range in size distribution, ranging from ultrasmall grains of a few Angstroms to micrometer-size grains. While the presence of nanometer-size dust gr…
A High-Quality velocity-delay map of the broad-line region in NGC 5548
Ming Xiao, Pu Du, Kai-Xing Lu +10
NGC 5548 has been well spectroscopically monitored for reverberation mapping of the central kinematics by 19 campaigns. Using the maximum entropy method in this Letter, we build up…
Gemini GNIRS near-infrared spectroscopy of 50 quasars at z>~5.7
Yue Shen, Jin Wu, Linhua Jiang +12
We report initial results from a large Gemini program to observe z>~5.7 quasars with GNIRS near-IR spectroscopy. Our sample includes 50 quasars with simultaneous ~0.85-2.5 micron s…
The QUEST-La Silla AGN variability survey: connection between AGN variability and black hole physical properties
P. Sánchez-Sáez, P. Lira, J. Mejía-Restrepo +5
We present our statistical analysis of the connection between active galactic nuclei (AGN) variability and physical properties of the central supermassive black hole (SMBH). We con…
SCUBA-2 Ultra Deep Imaging EAO Survey (STUDIES) II: Structural Properties and Near-Infrared Morphologies of Faint Submillimeter Galaxies
Yu-Yen Chang, Nicholas Ferraro, Wei-Hao Wang +25
We present structural parameters and morphological properties of faint 450-um selected submillimeter galaxies (SMGs) from the JCMT Large Program, STUDIES, in the COSMOS-CANDELS reg…
Supermassive black holes with high accretion rates in active galactic nuclei. VII. Reconstruction of velocity-delay maps by maximum entropy method
Ming Xiao, Pu Du, Keith D. Horne +11
As one of the series of papers reporting on a large reverberation mapping campaign, we apply the maximum entropy method (MEM) to 9 narrow-line Seyfert 1 galaxies with super-Eddingt…
Deceleration of CIV and SiIV broad absorption lines in X-ray bright quasar SDSS-J092345+512710
Ravi Joshi, Raghunathan Srianand, Hum Chand +4
We report a synchronized kinematic shift of CIV and SiIV broad absorption lines (BAL) in a high-ionization, radio-loud, and X-ray bright quasar SDSS-J092345+512710 (at $z_{em} \sim…
The extended radio jet of an off-nuclear low-mass AGN in NGC 5252
M. Mezcua, M. Kim, L. C. Ho +1
CXO J133815.6+043255 is an ultraluminous X-ray source (ULX) with ultraviolet, optical, and radio counterparts located 10 kpc away from the nucleus of the galaxy NGC 5252. Optical s…
The Sloan Digital Sky Survey Reverberation Mapping Project: Quasar Host Galaxies at from Image Decomposition
Minghao Yue, Linhua Jiang, Yue Shen +7
We present the rest-frame UV and optical photometry and morphology of low-redshift broad-line quasar host galaxies from the Sloan Digital Sky Survey Reverberation Mapping project.…
A New Technique for Measuring Polycyclic Aromatic Hydrocarbon Emission in Different Environments
Yanxia Xie, Luis C. Ho, Aigen Li +1
We present a new method to decompose the emission features of polycyclic aromatic hydrocarbons (PAHs) from mid-infrared spectra using theoretical PAH templates in conjunction with…
The Carnegie-Irvine Galaxy Survey. VI. Quantifying Spiral Structure
Si-Yue Yu, Luis C. Ho, Aaron J. Barth +1
The Carnegie-Irvine Galaxy Survey provides high-quality broad-band optical images of a large sample of nearby galaxies for detailed study of their structure. To probe the physical…