Search Publications
Resolved Massive Star Clusters in the Milky Way and Its Satellites: Brightness Profiles and a Catalog of Fundamental Parameters
van der Marel, Roeland P.; McLaughlin, Dean E.
We present a database of structural and dynamical properties for 153 spatially resolved star clusters in the Milky Way, the Large and Small Magellanic Clouds, and the Fornax dwarf spheroidal. This database complements and extends others in the literature, such as those of Harris and Mackey & Gilmore. Our cluster sample comprises 50 ``young mas…
Stellar Lyα Emission Lines in the Hubble Space Telescope Archive: Intrinsic Line Fluxes and Absorption from the Heliosphere and Astrospheres
Zank, Gary P.; Redfield, Seth; Wood, Brian E. +2 more
We search the Hubble Space Telescope (HST) archive for previously unanalyzed observations of stellar H I Lyα emission lines, our primary purpose being to look for new detections of Lyα absorption from the outer heliosphere and to also search for analogous absorption from the astrospheres surrounding the observed stars. The astrospheric absorption …
High-Ionization Emission in Metal-deficient Blue Compact Dwarf Galaxies
Thuan, Trinh X.; Izotov, Yuri I.
Primordial stars are expected to be very massive and hot, producing copious amounts of hard ionizing radiation. The best place to study hard ionizing radiation in the local universe is in very metal-deficient blue compact dwarf (BCD) galaxies. We have carried out a MMT spectroscopic search for [Ne V] λ3426 (ionization potential of 7.1 ryd), [Fe V]…
The Three-dimensional Circumstellar Environment of SN 1987A
Crotts, Arlin P. S.; Lawrence, Stephen S.; Sugerman, Ben E. K. +2 more
Surrounding SN 1987A is a three-ring nebula attributed to interacting stellar winds, yet no model has successfully reproduced this system. Fortunately, the progenitor's mass-loss history can be reconstructed using light echoes, in which scattered light from the supernova traces the three-dimensional morphology of its circumstellar dust. In this pa…
A Photometric Redshift Galaxy Catalog from the Red-Sequence Cluster Survey
Gladders, M. D.; Yee, H. K. C.; Hsieh, B. C. +1 more
The Red-Sequence Cluster Survey (RCS) provides a large and deep photometric catalog of galaxies in the z' and Rc bands for 90 deg2 of sky, and supplemental V and B data have been obtained for 33.6 deg2. We compile a photometric redshift catalog from these four-band data by utilizing the empirical quadrat…
The ACS Virgo Cluster Survey. IV. Data Reduction Procedures for Surface Brightness Fluctuation Measurements with the Advanced Camera for Surveys
Jordán, Andrés; Tonry, John L.; Côté, Patrick +7 more
The Advanced Camera for Surveys (ACS) Virgo Cluster Survey is a large program to image 100 early-type Virgo galaxies using the F475W and F850LP bandpasses of the Wide Field Channel of the ACS instrument on the Hubble Space Telescope (HST). The scientific goals of this survey include an exploration of the three-dimensional structure of the Virgo Cl…
Atomic and Molecular Gas in Colliding Galaxy Systems. I. The Data
Yun, Min S.; Iono, Daisuke; Ho, Paul T. P.
We present H I and CO (1-0) interferometric observations of 10 comparable-mass interacting systems obtained at the Very Large Array (VLA) and the Owens Valley Radio Observatory (OVRO) millimeter array. The primary intent of this study is to investigate the response of cold gas during the early stages of collision of massive disk galaxies. The samp…
X-Ray Emission from Orion Nebula Cluster Stars with Circumstellar Disks and Jets
Bally, John; Feigelson, Eric D.; Kastner, Joel H. +5 more
We investigate the X-ray and near-infrared emission properties of a sample of pre-main-sequence (PMS) stellar systems in the Orion Nebula Cluster (ONC) that display evidence for circumstellar disks (``proplyds'') and optical jets in Hubble Space Telescope (HST) imaging. Our study uses X-ray data acquired during Chandra Orion Ultradeep Program (COU…
Highly Ionized Gas in the Galactic Halo and the High-Velocity Clouds toward PG 1116+215
Tripp, Todd M.; Sembach, Kenneth R.; Savage, Blair D. +1 more
We have obtained high-resolution Far Ultraviolet Spectroscopic Explorer (FUSE) and Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) echelle observations of the quasar PG 1116+215 (zem=0.1765, l=223.36d, b=+68.21d). The semicontinuous coverage of the ultraviolet spectrum over the wavelength range 916-2800 Å provid…
The Ultraviolet Spectrum of η Carinae: Investigation of the Ejecta Absorption
Gull, T. R.; Nielsen, K. E.; Vieira Kober, G.
We have investigated the far- through mid-UV (1150-2360 Å) spectrum of η Carinae during the late stages of its broad maximum using the Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) moderate dispersion echelle modes. The η Car spectrum is a mixture of absorption and emission lines from the surrounding nebula superimposed …