199 citations · 780 across the 19 of their papers we have counts for
9 papers · 1 filter
Properties of Ellipticity Correlation with Atmospheric Structure from Gemini South
S. Asztalos, W. H. de Vries, L. J Rosenberg +5
Cosmic shear holds great promise for a precision independent measurement of , the mass density of the universe relative to the critical density. The signal is expected to b…
Cepheid Distances to SNe Ia Host Galaxies based on a Revised Photometric Zero-Point of the HST-WFPC2 and New P-L Relations and Metallicity Corrections
A. Saha, F. Thim, G. A. Tammann +2
With this paper we continue the preparation for a forthcoming summary report of our experiment with the Hubble Space Telescope (HST) to determine the Hubble constant using type Ia…
Faint BVRI Photometric Sequences in Selected Fields
A. Saha, A. E. Dolphin, F. Thim +1
The results from work done to extend the Johnson-Cousins BVRI photometric standard sequence to faint levels of V ~ 21 mag in compact fields is presented. Such calibration and exten…
Short-Period Variable Stars in the M31 Halo
A. E. Dolphin, A. Saha, E. W. Olszewski +4
We report the findings of a new search for RR Lyraes in an M31 halo field located 40 arcminutes from the nucleus of the galaxy along the minor axis. We detected 37 variable stars,…
Properties of three gas-rich dwarfs in the Centaurus A group
M. Grossi, M. J. Disney, B. J. Pritzl +5
We present HST/WFPC2 observations (F555W, F814W) and ATCA high resolution HI maps of three gas-rich dwarf galaxies in the Centaurus A group discovered in two blind 21-cm surveys (H…
Anomalous Evolution of the Dwarf Galaxy HIPASS J1321-31
Barton J. Pritzl, Patricia M. Knezek, John S. Gallagher +6
We present HST/WFPC2 observations of the dwarf galaxy HIPASS J1321-31. This unusual galaxy lies in the direction of the Centaurus A group of galaxies, and has a color-magnitude dia…
Deep HST Imaging of Sextans A. III. The Star Formation History
Andrew E. Dolphin, A. Saha, Evan D. Skillman +6
We present a measurement of the star formation history of Sextans A, based on WFPC2 photometry that is 50% complete to V=27.5 (M_V ~+ 1.9) and I=27.0. The star formation history an…
Deep HST Imaging of Sextans A. II. Cepheids and Distance
Andrew E. Dolphin, A. Saha, Evan D. Skillman +6
We have identified 82 short-period variable stars in Sextans A from deep WFPC2 observations. All of the periodic variables appear to be short-period Cepheids, with periods as small…
Deep HST Imaging of IC 1613. I. Variable Stars and Distance
Andrew E. Dolphin, A. Saha, Evan D. Skillman +6
We present WFPC2 VI photometry of a field in the halo of IC 1613, finding 13 RR Lyraes and 11 Cepheids. Our photometry of the red giant branch tip and red clump is used to derive d…