4.2k citations · 53.7k across the 547 of their papers we have counts for
18 papers · 2 filters
Emission and Absorption in the M87 LINER
B. M. Sabra, J. C. Shields, L. C. Ho +2
The nucleus of M87 displays a LINER spectrum at optical wavelengths, with a nuclear disk of nebulosity that is resolved by the Hubble Space Telescope. We present new results from o…
Axisymmetric Dynamical Models of the Central Regions of Galaxies
Karl Gebhardt, Douglas Richstone, Scott Tremaine +12
We present axisymmetric, orbit superposition models for 12 galaxies using data taken with the Hubble Space Telescope (HST) and ground-based observatories. In each galaxy, we detect…
A Study of the Direct-Fitting Method for Measurement of Galaxy Velocity Dispersions
A. J. Barth, L. C. Ho, W. L. W. Sargent
We have measured the central stellar velocity dispersions of 33 nearby spiral and elliptical galaxies, using a straightforward template-fitting algorithm operating in the pixel dom…
The Black Hole Masses and Host Galaxies of BL Lac Objects
A. J. Barth, L. C. Ho, W. L. W. Sargent
We have measured the central stellar velocity dispersion in the host galaxies of 11 BL Lac objects with redshifts z <= 0.125. The range of velocity dispersions, 170-370 km/s, is si…
A 20 Thousand Solar Mass Black Hole in the Stellar Cluster G1
Karl Gebhardt, R. Michael Rich, Luis Ho
We present the detection of a 2.0(+1.4,-0.8)x10^4 solar mass black hole (BH) in the stellar cluster G1 (Mayall II), based on data taken with the Space Telescope Imaging Spectrograp…
Search for ultraluminous X-ray sources in nearby galaxies
L. Foschini, G. Di Cocco, L. C. Ho +9
Little is presently known about the nature of ultraluminous X-ray sources (ULX). Different hypotheses have been proposed to explain their properties: intermediate-mass BHs, Kerr BH…
A Search for Active Galactic Nuclei in Sc Galaxies with H II Spectra
James S. Ulvestad, Luis C. Ho
(Abridged) We have searched for nuclear radio emission from a statistically complete sample of 40 Sc galaxies within 30 Mpc that are optically classified as star-forming objects, i…
The Type Ia Supernova 1999aw: a Probable 1999aa-like Event In a Low-Luminosity Host Galaxy
L. -G. Strolger, R. C. Smith, N. B. Suntzeff +39
SN 1999aw was discovered during the first campaign of the Nearby Galaxies Supernova Search (NGSS) project. This luminous, slow-declining (Delta m_{15} (B) = 0.81 \pm 0.03) Type Ia…
Magellan Spectroscopy of the Galaxy Cluster RX J1347.5-1145: Redshift Estimates for the Gravitationally Lensed Arcs
Swara Ravindranath, Luis C. Ho
We present imaging and spectroscopic observations of the gravitationally lensed arcs in the field of RX J1347.5-1145, the most X-ray luminous galaxy cluster known. Based on the det…
Galaxies with a Central Minimum in Stellar Luminosity Density
Tod R. Lauer, Karl Gebhardt, Douglas Richstone +15
We used HST WFPC2 images to identify six early-type galaxies with surface- brightness profiles that decrease inward over a limited range of radii near their centers. The implied lu…
The Radio Properties of Composite LINER/HII Galaxies
Mercedes E. Filho, Peter D. Barthel, Luis C. Ho
Arcsec-resolution VLA observations -- newly obtained as well as published -- of 40 nearby galaxies are discussed, completing a study of the radio properties of a magnitude-limited…
Detailed Structural Decomposition of Galaxy Images
Chien Y. Peng, Luis C. Ho, Chris D. Impey +1
We present a two-dimensional (2-D) fitting algorithm (GALFIT) designed to extract structural components from galaxy images, with emphasis on closely modeling light profiles of spat…
The slope of the black-hole mass versus velocity dispersion correlation
Scott Tremaine, Karl Gebhardt, Ralf Bender +12
Observations of nearby galaxies reveal a strong correlation between the mass of the central dark object M and the velocity dispersion sigma of the host galaxy, of the form log(M/M_…
X-ray Properties of LINERs and Low-luminosity Seyfert Galaxies Observed with ASCA. I. Observations and Results
Yuichi Terashima, Naoko Iyomoto, Luis C. Ho +1
This paper presents a comprehensive study of the X-ray properties of low-ionization nuclear emission-line regions (LINERs) and low-luminosity Seyfert galaxies based on observations…
Fe K Emission Lines in Low-luminosity AGNs
Yuichi Terashima, Naoko Iyomoto, Luis C. Ho +1
We present the results of a systematic analysis of Fe K emission lines in low-luminosity AGNs (LLAGNs) observed with ASCA. We used a sample of LLAGNs with small intrinsic absorptio…
First Results from a XMM-Newton Survey of a Distance-Limited (D < 22 Mpc) Sample of Seyfert Galaxies. II - The Galactic Serendipitous Sources
L. Foschini, G. Di Cocco, M. Dadina +9
We present preliminary results from a study with XMM-Newton of the galactic serendipitous sources in a sample of 28 nearby Seyfert galaxies (with D < 22 Mpc). We concentrate here o…
Light-year Scale Radio Cores in Four LINER Galaxies
Mercedes E. Filho, Peter D. Barthel, Luis C. Ho
The LINER galaxies NGC 2911, NGC 3079, NGC 3998, and NGC 6500 were observed at 5 GHz with the European VLBI Network at a resolution of 5 milliarcsecond and found to possess flat-sp…
Stellar Velocity Dispersion and Black Hole Mass in the Blazar Markarian 501
A. J. Barth, L. C. Ho, W. L. W. Sargent
The recently discovered correlation between black hole mass and stellar velocity dispersion provides a new method to determine the masses of black holes in active galaxies. We have…