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Quantitative morphological analysis of the Hubble Deep Field North and Hubble Deep Field South - I. Early- and late-type luminosity-size relations of galaxies out to z~ 1
Aguerri, J. A. L.; Trujillo, I.
Based on drizzled F606W and F814W images, we present quantitative structural parameters in the V-band rest-frame for all galaxies with z < 1 and I814(AB) < 24.5 mag in the Hubble Deep Fields North and South. Our structural parameters are based on a two-component surface brightness distribution using a Sérsic bulge and an exponenti…
Measurement of Cosmic Shear with the Space Telescope Imaging Spectrograph
Refregier, Alexandre; Gardner, Jonathan P.; Rhodes, Jason +3 more
Weak lensing by large-scale structure allows a direct measure of the dark matter distribution. We have used parallel images taken with the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope to measure weak lensing, or cosmic shear. We measure the shapes of 26,036 galaxies in 1292 STIS fields and measure the shear variance at…
Variability of Narrow, Associated Absorption Lines in Moderate- and Low-Redshift Quasars
Charlton, Jane C.; Eracleous, Michael; Ganguly, Rajib +1 more
We present the results of a search for variability in the equivalent widths (EWs) of narrow, associated (|Δv|<=5000 km s-1) absorption lines found in the UV spectra of z<=1.5 quasars. The goal of this search was to use variability as a means of identifying absorption lines arising in gas that is intrinsic to the quasar central eng…
The Hot White Dwarf in the Cataclysmic Variable MV Lyrae
Szkody, Paula; Sion, Edward M.; Hoard, D. W. +4 more
We have obtained the first far-ultraviolet spectrum of the nova-like cataclysmic variable MV Lyrae using the Far Ultraviolet Spectroscopic Explorer (FUSE). We also obtained contemporaneous optical light curves and spectra. All data are from a deep faint accretion state of MV Lyr. We constructed a model for the system using the BINSYN software pack…
Chandra Observations of the Cloverleaf Quasar H1413+117: A Unique Laboratory for Microlensing Studies of a LoBAL Quasar
Agol, E.; Chartas, G.; Gallagher, S. C. +1 more
We present new results uncovered by a reanalysis of a Chandra observation of the gravitationally lensed, low-ionization broad absorption line (LoBAL) quasar H1413+117. Previous analyses of the same Chandra observation led to the detection of a strong, redshifted Fe Kα line from the combined spectrum of all images. We show that the redshifted Fe Kα…
The XMM-LSS survey. First high redshift galaxy clusters: Relaxed and collapsing systems
Altieri, B.; Valtchanov, I.; Pierre, M. +11 more
We present five newly found galaxy clusters at z>0.6 from the XMM Large-Scale Structure Survey (XMM-LSS). All five objects are extended X-ray sources in the XMM images. For three of them we have sufficient spectroscopically confirmed member galaxies that an estimate of the velocity dispersion is possible: XLSSC 001 at z=0.613 and &sigma
XMM-Newton observations of the binary cluster system Abell 399/401
Sakelliou, Irini; Ponman, Trevor J.
Both Abell 399 and Abell 401 are rich clusters of galaxies, with global temperatures of 7.2 (Abell 399) and 8.5 keV (Abell 401), respectively. They lie at a projected separation of ~3 Mpc, forming a close pair. We have observed the system with the XMM-Newton satellite. The data of each cluster show significant departures from our idealized picture…
Image simulation with shapelets
Refregier, Alexandre; Conselice, Christopher J.; Massey, Richard +2 more
We present a method to simulate deep sky images, including realistic galaxy morphologies and telescope characteristics. To achieve a wide diversity of simulated galaxy morphologies, we first use the shapelets formalism to parametrize the shapes of all objects in the Hubble Deep Fields. We measure this distribution of real galaxy morphologies in sh…
Evidence of an Intermediate-Mass Black Hole: Chandra and XMM-Newton Observations of the Ultraluminous Supersoft X-Ray Source in M101 during Its 2004 Outburst
Kong, A. K. H.; Yuan, F.; Di Stefano, R.
We report the results of Chandra and XMM-Newton observations of a new outburst of an ultraluminous supersoft X-ray source in M101. CXOU J140332.3+542103 was observed in a low-luminosity state (LX~1037 ergs s-1) between 2004 January and May. The low-state X-ray spectra were relatively hard; the combined low-state sp…
NGC 3125-1: The Most Extreme Wolf-Rayet Star Cluster Known in the Local Universe
Leitherer, Claus; Chandar, Rupali; Tremonti, Christy A.
We use Space Telescope Imaging Spectrograph long-slit ultraviolet spectroscopy of local starburst galaxies to study the massive star content of a representative sample of super-star clusters, with a primary focus on their Wolf-Rayet (W-R) content as measured from the He II λ1640 emission feature. The goals of this work are threefold. First, we qua…