Search Publications
The Stellar Content of the COSMOS Field as Derived from Morphological and SED-based Star/Galaxy Separation
Kneib, J. -P.; Aussel, H.; Taniguchi, Y. +12 more
We report on the stellar content of the COSMOS two degree field, as derived from a rigorous star-galaxy separation approach developed for using stellar sources to define the point-spread function variation map used in a study of weak galaxy lensing. The catalog obtained in one filter from the ACS (Advanced Camera for Surveys on the Hubble Space Te…
Goodness-of-Fit Tests DIFF1 and DIFF2 for Locally Normalized Supernova Spectra
Baron, E.; Branch, David; Danziger, I. J. +3 more
Two quantitative tests DIFF1 and DIFF2 for measuring goodness of fit between two locally normalized supernova spectra are presented. Locally normalized spectra are obtained by dividing a spectrum by the same spectrum smoothed over a wavelength interval relatively large compared to line features, but relatively small compared to continuum features.…
The Host Galaxies and Environment of Chandra-Selected Active Galactic Nuclei in the Deep ACS GTO Cluster Fields
Infante, Leopoldo; Tozzi, Paolo; Ford, Holland C. +2 more
We present catalogs and images of optical counterparts to the Chandra-selected X-ray sources found in the fields of the five clusters RX J0152-1357, RX J0849+4452, RDCS J0910+5422, MS 1054-0321, and RDCS J1252-2927, which were imaged with the Advanced Camera for Surveys as part of the ACS Guaranteed Time Observer programs. A total of 98 X-ray sour…
X-Ray and Ultraviolet Spectroscopy of Intermediate-Mass, First Crossing Giants
Ayres, Thomas R.; Brown, Alexander; Hodges-Kluck, Edmund
Chandra, FUSE, and HST STIS jointly have obtained spectra of four intermediate-mass giants (<~3 Msolar) crossing the Hertzsprung gap for the first time, passing through a ``rapid braking phase'' analogous to, but much briefer than, the more gradual prolonged decay of magnetic activity experienced by single low-mass stars like the Sun…
The X-Ray Binary Population in M33. II. X-Ray Spectra and Variability
Zezas, A.; Fabbiano, G.; Kim, D. -W. +2 more
In this paper we investigate the X-ray spectra and X-ray spectral variability of compact X-ray sources for 3 Chandra observations of the Local Group galaxy M33. The observations are centered on the nucleus and the star-forming region NGC 604. In the observations, 261 sources have been detected. For a total of 43 sources the number of net counts is…
Eta Carinae across the 2003.5 Minimum: Deciphering the Spectrum toward Weigelt D
Gull, T. R.; Nielsen, K. E.; Ivarsson, S.
Hubble Space Telescope Space Telescope Imaging Spectrograph (HST STIS) near-ultraviolet (NUV) echelle spectra reveal complex structure in the sight line toward the Weigelt D condensation located 0.25" north-northwest of η Car. In previous studies, the Weigelt condensations have been described to exhibit pure emission line spectra dominated by tran…
A Potential Galaxy Threshing System in the COSMOS Field
Aussel, H.; Sanders, D. B.; Murayama, T. +26 more
We report on the discovery of a new potential galaxy threshing system in the COSMOS 2 square degree field using the prime-focus camera, Suprime-Cam, on the 8.2 m Subaru Telescope. This system consists of a giant elliptical galaxy with MV~-21.6 and a tidally disrupted satellite galaxy with MV~-17.7 at a photometric redshift of…
An Ultraviolet Spectral Atlas of VV Cephei during Total Eclipse
Bennett, Philip D.; Brown, Alexander; Bauer, Wendy Hagen
The first observations of the ultraviolet spectrum of the binary system VV Cep (M2 Iab+B?) during total eclipse have been made with the HST. A rich emission-line spectrum is seen, with over two thousand emission features present. Shortward of 1600 Å, a weak continuum presumably due to Rayleigh scattering of the hot component is present, strengthen…
Metal Absorption Profiles from the Central Star of the Planetary Nebula M27 (NGC 6853, PN G060.8-03.6, the Dumbbell): Photospheric and Nebular Line Identifications
McCandliss, Stephan R.; Kruk, Jeffrey
High-resolution spectra of the hot central star of the planetary nebula (CSPN) M27, acquired with the Far Ultraviolet Spectroscopic Explorer (FUSE), have revealed an unusually rich set of narrow molecular hydrogen absorption features. This object is also unique in that the velocity of nebular absorption features are cleanly separated from the velo…
The ACS Virgo Cluster Survey. VI. Isophotal Analysis and the Structure of Early-Type Galaxies
Jordán, Andrés; Tonry, John L.; Côté, Patrick +8 more
We present a detailed analysis of the morphology, isophotal parameters, and surface brightness profiles for 100 early-type members of the Virgo Cluster, from dwarfs (MB=-15.1 mag) to giants (MB=-21.8 mag), imaged in the g and z passbands using the Advanced Camera for Surveys on board the Hubble Space Telescope. Dust and compl…