Search Publications
Galaxy flow in the Canes Venatici I cloud
Sarajedini, A.; Dolphin, A. E.; Grebel, E. K. +7 more
We present an analysis of Hubble Space Telescope/WFPC2 images of eighteen galaxies in the Canes Venatici I cloud. We derive their distances from the luminosity of the tip of the red giant branch stars with a typical accuracy of ~ 12%. The resulting distances are 3.9 Mpc (UGC 6541), 4.9 Mpc (NGC 3738), 3.0 Mpc (NGC 3741), 4.5 Mpc (KK 109), >6.3 …
Evidence for a Major Merger Origin of High-Redshift Submillimeter Galaxies
Conselice, Christopher J.; Windhorst, Rogier A.; Chapman, Scott C.
Submillimeter-detected galaxies located at redshifts z>1 host a major fraction of the bolometric luminosity at high redshifts due to thermal emission from heated dust grains, yet the nature of these objects remains a mystery. The major problem in understanding their origin is whether the dust-heating mechanism is predominantly caused by star fo…
The dynamical state of the Coma cluster with XMM-Newton
Pratt, G. W.; Neumann, D. M.; Briel, U. G. +1 more
We present in this paper a substructure and spectroimaging study of the Coma cluster of galaxies based on XMM-Newton data. XMM-Newton performed a mosaic of observations of Coma to ensure a large coverage of the cluster. We add the different pointings together and fit elliptical beta-models to the data. We subtract the cluster models from the data …
The DEEP Groth Strip Survey. IX. Evolution of the Fundamental Plane of Field Galaxies
Illingworth, Garth D.; Weiner, Benjamin; Gebhardt, Karl +8 more
Fundamental plane studies provide an excellent means of understanding the evolutionary history of early-type galaxies. Using the Low Resolution Imaging Spectrograph on the Keck Telescope, we obtained internal stellar kinematic information for 36 field galaxies in the Groth Strip, 21 early-type and 15 disk galaxies. Their redshifts range from 0.3 t…
Constraints on the Ionization Balance of Hot-Star Winds from FUSE Observations of O Stars in the Large Magellanic Cloud
Sonneborn, G.; Massa, D.; Hutchings, J. B. +1 more
We present Far Ultraviolet Spectroscopic Explorer (FUSE) spectra for 25 O stars in the Large Magellanic Cloud. We analyze wind profiles for the resonance lines from C III, N III, S IV, P V, S VI, and O VI in the FUSE range using a ``Sobolev with exact integration'' method. In addition, the available data from either IUE or the Hubble Space Telesco…
Massive Star Formation in a Gravitationally Lensed H II Galaxy at z = 3.357
Stern, D.; Sargent, W. L. W.; Rosati, P. +9 more
The Lynx arc, with a redshift of 3.357, was discovered during spectroscopic follow-up of the z=0.570 cluster RX J0848+4456 from the ROSAT Deep Cluster Survey. The arc is characterized by a very red R-K color and strong, narrow emission lines. Analysis of HST WFPC2 imaging and Keck optical and infrared spectroscopy shows that the arc is an H II gal…
The Hubble diagram of type Ia supernovae as a function of host galaxy morphology
Panagia, N.; Wang, L.; Sullivan, M. +41 more
We present new results on the Hubble diagram of distant type Ia supernovae (SNeIa) segregated according to the type of host galaxy. This makes it possible to check earlier evidence for a cosmological constant by explicitly comparing SNe residing in galaxies likely to contain negligible dust with the larger sample. The cosmological parameters deriv…
Method for Spot Detection on Solar-like Stars
Silva, Adriana V. R.
As a planet eclipses its parent star, a dark starspot may be occulted, causing a detectable variation in the light curve. This work describes how features on the surface of a solar-like star can be studied by using planetary transits. Images of the Sun were used in order to simulate such transits, with the planet being modeled as a dark disk at va…
The Canada-UK Deep Submillimeter Survey. VI. The 3 Hour Field
Ivison, R. J.; Clements, D. L.; Dunne, L. +6 more
We present the complete submillimeter data for the Canada-UK Deep Submillimeter Survey (CUDSS) 3h field. The observations were taken with the Submillimeter Common-User Bolometric Array (SCUBA) on the James Clerk Maxwell Telescope (JCMT) on Mauna Kea. The 3h field is one of two main fields in our survey and covers 60 arcmin
Spectroscopy of the near-nuclear regions of Cygnus A: estimating the mass of the supermassive black hole
Marconi, A.; Axon, D.; Jackson, N. +3 more
We use a combination of high spatial resolution optical and near-infrared spectroscopic data to make a detailed study of the kinematics of the narrow-line region (NLR) gas in the near-nuclear regions of the powerful, FRII radio galaxy Cygnus A (z= 0.0560), with the overall goal of placing limits on the mass of any supermassive black hole in the co…