Search Publications
The Look-back Time Evolution of Far-Ultraviolet Flux from the Brightest Cluster Elliptical Galaxies at z < 0.2
Rey, Soo-Chang; Schawinski, Kevin; Heckman, Timothy M. +28 more
We present the GALEX UV photometry of the elliptical galaxies in Abell clusters at moderate redshifts (z<0.2) for the study of the look-back time evolution of the UV upturn phenomenon. The brightest elliptical galaxies (Mr<~-22) in 12 remote clusters are compared with the nearby giant elliptical galaxies of comparable optical lumi…
An Atlas of [N II] and [O III] Images and Spectra of Planetary Nebulae
Jaskot, Anne E.; Panagia, Nino; Balick, Bruce +10 more
We present an atlas of Hubble Space Telescope images and ground-based, long-slit, narrowband spectra centered on the 6584 Å line of [N II] and the 5007 Å line of [O III]. The spectra were obtained for a variety of slit positions across each target (as shown on the images) in an effort to account for nonspherical nebular geometries in a robust mann…
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…