19.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Kitt Peak National ObservatoryUS401 papers
- Cerro Tololo Inter-American ObservatoryCL274 papers
- U.S. National Science FoundationUS162 papers
- Space Telescope Science InstituteUS159 papers
- California Institute of TechnologyUS116 papers
- University of ArizonaUS99 papers
- Center for Astrophysics Harvard & SmithsonianUS80 papers
- Johns Hopkins UniversityUS71 papers
- University of California, BerkeleyUS58 papers
- University of Wisconsin–MadisonUS58 papers
- Carnegie ObservatoriesUS57 papers
- Goddard Space Flight CenterUS56 papers
54 papers · 1 filter
Quasars with Super Metal Rich Emission Line Regions
Neelam Dhanda, Jack A. Baldwin, Misty C. Bentz +1
We study the degree of chemical enrichment in the Broad Emission Line Regions (BELRs) of two QSOs with unusually strong nitrogen emission lines. The N V 1240/ C IV 1549 intensity r…
Hubble Space Telescope Fine Guidance Sensor Parallaxes of Galactic Cepheid Variable Stars: Period-Luminosity Relations
G. Fritz Benedict, Barbara E. McArthur, Michael W. Feast +6
(abridged) We present new absolute trigonometric parallaxes and relative proper motions for nine Galactic Cepheid variable stars: l Car, zeta Gem, beta Dor, W Sgr, X Sgr, Y Sgr, FF…
HII Region Oxygen Abundances in Starbursting Transition Dwarf Galaxies
K. E. Dellenbusch, J. S. Gallagher, P. M. Knezek
We present empirical HII region oxygen abundances for a sample of low-luminosity starburst galaxies which are in a short lived evolutionary state. All five galaxies are characteriz…
Near-Infrared Properties of Moderate-Redshift Galaxy Clusters: Luminosity Functions and Density Profiles
Adam Muzzin, H. K. C. Yee, Patrick B. Hall +2
We present K-band imaging for 15 of the Canadian Network for Observational Cosmology (CNOC1) clusters. The cluster luminosity density and number density profiles can be described b…
Near-Infrared Spectroscopy of Carbon-Enhanced Metal-Poor Stars. I. A SOAR/OSIRIS Pilot Study
Timothy C. Beers, Thirupathi Sivarani, Brian Marstellar +3
We report on an abundance analysis for a pilot study of seven Carbon-Enhanced Metal-Poor (CEMP) stars, based on medium-resolution optical and near-infrared spectroscopy. The optica…
Trigonometric Parallaxes of Central Stars of Planetary Nebulae
Hugh C. Harris, Conard C. Dahn, Blaise Canzian +11
Trigonometric parallaxes of 16 nearby planetary nebulae are presented, including reduced errors for seven objects with previous initial results and results for six new objects. The…
Narrow-band Imaging in the CN Band at 388.33 nm
Han Uitenbroek, Alexandra Tritschler
We promote the use of narrow-band (0.05 -- 0.20 nm FWHM) imaging in the molecularvCN band head at 388.33 nm as an effective method for monitoring small-scale magnetic field element…
On the fine structure of the quiet solar \Ca II K atmosphere
Alexandra Tritschler, Wolfgang Schmidt, Han Uitenbroek +1
We investigate the morphological, dynamical, and evolutionary properties of the internetwork and network fine structure of the quiet sun at disk centre. The analysis is based on a…
The Origin of Line Emission in Massive z~2.3 Galaxies: Evidence for Cosmic Downsizing of AGN Host Galaxies
Mariska Kriek, Pieter G. van Dokkum, Marijn Franx +12
Using the Gemini Near-InfraRed Spectrograph (GNIRS), we have assembled a complete sample of 20 K-selected galaxies at 2.0<z<2.7 with high quality near-infrared spectra. As describe…
Joint H-alpha and X-ray Observations of Massive X-ray Binaries. I. The B-Supergiant System LS I +65 010 = 2S 0114+650
E. D. Grundstrom, J. L. Blair, D. R. Gies +8
We report on a three year spectroscopic monitoring program of the H-alpha emission in the massive X-ray binary LS I +65 010 = 2S 0114+650, which consists of a B-supergiant and a sl…
Dust rings and filaments around the isolated young star V1331 Cygni
Sascha P. Quanz, Daniel Apai, Thomas Henning
We characterize the small and large scale environment of the young star V1331 Cygni with high resolution HST/WFPC2 and Digitized Sky Survey images. In addition to a previously know…
The Environments of Ultra-strong Mg II Absorbers
Daniel B. Nestor, David A. Turnshek, Sandhya M. Rao +1
We present r'- or i'-band WIYN images of the fields of 15 Sloan Digital Sky Survey quasars that have spectra exhibiting intervening MgII absorption-line systems with rest equivalen…
XMM detection of the supernova remnant G337.2+0.1
Jorge A. Combi, Juan F. Albacete Colombo, Gustavo E. Romero +1
We report the first XMM detection of the SNR candidate G337.2+0.1 (=AX J1635.9-4719). The object shows centrally filled and diffuse X-ray emission. The emission peaks in the hard 3…
Discovery of the brightest T dwarf in the northern hemisphere
Etienne Artigau, Rene Doyon, David Lafreniere +3
We report the discovery of a bright (H=12.77) brown dwarf designated SIMP J013656.5+093347. The discovery was made as part of a near-infrared proper motion survey, SIMP (Sondage In…
Joint H-alpha and X-Ray Observations of Massive X-Ray Binaries. II. The Be X-ray Binary and Microquasar LS I +61 303
E. D. Grundstrom, S. M. Caballero-Nieves, D. R. Gies +6
We present the results of an H-alpha monitoring campaign on the BeXRB and microquasar system LS I +61 303. We use radial velocity measurements of HeI lines in our spectra to re-eva…
A Catalog of Candidate Field Horizontal-Branch and A-Type Stars. III. A 2MASS-Cleaned Version
Timothy C. Beers, Tiago Almeida, Silvia Rossi +2
We present coordinates and available photometric information (either from previous or recent broadband UBV observations, and near-infrared photometry from the 2MASS Point Source Ca…
The Extinction and Distance of Maffei 2 and a New View of the IC 342/Maffei Group
Robin L. Fingerhut, Henry Lee, Marshall L. McCall +1
We have obtained spectra of HII regions in the heavily obscured spiral galaxy Maffei 2. The observations have allowed for a determination of the Galactic extinction of this galaxy…
The Centers of Early-Type Galaxies with HST. VI. Bimodal Central Surface Brightness Profiles
Tod R. Lauer, Karl Gebhardt, S. M. Faber +9
We combine the results from several HST investigations of the central structure of early-type galaxies to generate a large sample of parameterized surface photometry. The studies i…
Meeting the Cool Neighbors. IX. The Luminosity Function of M7-L8 Ultracool Dwarfs in the Field
Kelle L. Cruz, I. Neill Reid, J. Davy Kirkpatrick +7
We present a 20-pc, volume-limited sample of M7-L8 dwarfs created through spectroscopic follow-up of sources selected from the Two Micron All Sky Survey (2MASS) Second Incremental…
A Cold Nearby Cloud Inside the Local Bubble
David M. Meyer, J. T. Lauroesch, Carl Heiles +2
The high-latitude Galactic H I cloud toward the extragalactic radio source 3C 225 is characterized by very narrow 21 cm emission and absorption indicative of a very low H I spin te…
The Nature of the Secondary Star in the Black Hole X-Ray Transient V616 Mon (=A0620-00)
Thomas E. Harrison, Steve B. Howell, Paula Szkody +1
We have used NIRSPEC on Keck II to obtain -band spectroscopy of the low mass X-ray binary V616 Mon (= A062000). V616 Mon is the proto-typical soft x-ray transient containing…
CHARA Array K'-band Measurements of the Angular Dimensions of Be Star Disks
D. R. Gies, W. G. Bagnuolo, E. K. Baines +22
We present the first K'-band, long-baseline interferometric observations of the northern Be stars gamma Cas, phi Per, zeta Tau, and kappa Dra. The measurements were made with multi…
SDSS AGNs with X-ray Emission from ROSAT PSPC Pointed Observations
A. A. Suchkov, R. J. Hanisch, W. Voges +1
We present a sample of 1744 type 1 active galactic nuclei (AGNs) from the Sloan Digital Sky Survey (SDSS DR4) spectroscopic catalog with X-ray counterparts in the White-Giommi-Ange…
Lightcurves of Type Ia Supernovae from Near the Time of Explosion
Arti Garg, Christopher W. Stubbs, Peter Challis +18
We present a set of 11 type Ia supernova (SN Ia) lightcurves with dense, pre-maximum sampling. These supernovae (SNe), in galaxies behind the Large Magellanic Cloud (LMC), were dis…