Search Publications
Circumnuclear Gas in Seyfert 1 Galaxies: Morphology, Kinematics, and Direct Measurement of Black Hole Masses
Malkan, Matthew A.; Hicks, Erin K. S.
The two-dimensional (2D) distribution and kinematics of the molecular, ionized, and highly ionized gas in the nuclear regions of Seyfert 1 galaxies have been measured using high spatial resolution (~0.09'') near-infrared spectroscopy from NIRSPEC with adaptive optics on the Keck telescope. Molecular hydrogen, H2, is detected in all nine…
The VLA Survey of the Chandra Deep Field-South. I. Overview and the Radio Data
Tozzi, P.; Mainieri, V.; Rosati, P. +5 more
We report 20 and 6 cm VLA deep observations of the CDF-S including the Extended CDF-S. We discuss the radio properties of 266 cataloged radio sources, of which 198 are above a 20 cm completeness level reaching down to 43 µJy at the center of the field. Survey observations made at 6 cm over a more limited region cover the original CDF-S to a …
The Hubble Space Telescope Advanced Camera for Surveys Coma Cluster Survey. I. Survey Objectives and Design
Ferguson, Henry C.; Mobasher, Bahram; Miller, Bryan W. +34 more
We describe the HST ACS Coma Cluster Treasury survey, a deep two-passband imaging survey of one of the nearest rich clusters of galaxies, the Coma Cluster (Abell 1656). The survey was designed to cover an area of 740 arcmin2 in regions of different density of both galaxies and intergalactic medium within the cluster. The ACS failure of …
The Hα Luminosity Function and Star Formation Rate at z ≈ 0.24 in the COSMOS 2 Square Degree Field
Kneib, J. -P.; Aussel, H.; Sanders, D. B. +25 more
To derive a new Hα luminosity function and to understand the clustering properties of star-forming galaxies at z ≈ 0.24, we have made a narrowband imaging survey for Hα-emitting galaxies in the Hubble Space Telescope (HST) COSMOS 2 square degree field. We used the narrowband filter NB816 (λc = 8150 Å, Δ λ = 120 Å) and sampled Hα emitter…
A Space Telescope Imaging Spectrograph Survey for O VI Absorption Systems at 0.12 < z lesssim 0.5. II. Physical Conditions of the Ionized Gas
Chen, Hsiao-Wen; Thom, C.
We present a complete catalog of 27 O VI absorbers at low redshift (0.12 < z < 0.5) from a blind survey of 16 QSO echelle spectra in the Hubble Space Telescoep Space Telescope Imaging Spectrograph data archive. These absorbers are identified based only on matching line profiles and the expected doublet ratio between the λλ1031, 1037 transiti…
GEMS Survey Data and Catalog
Bell, Eric F.; Somerville, Rachel S.; Wisotzki, Lutz +14 more
We describe the data reduction and object cataloging for the GEMS survey, a large-area (800 arcmin2) two-band (F606W and F850LP) imaging survey with the Advanced Camera for Surveys on the Hubble Space Telescope, centered on the Chandra Deep Field-South.
Decomposition of the Host Galaxies of Active Galactic Nuclei Using Hubble Space Telescope Images
Ho, Luis C.; Barth, Aaron J.; Im, Myungshin +2 more
Investigating the link between supermassive black hole and galaxy evolution requires careful measurements of the properties of the host galaxies. We perform simulations to test the reliability of a two-dimensional image-fitting technique to decompose the host galaxy and the active galactic nucleus (AGN), especially on images obtained using cameras…
Is the Gini Coefficient a Stable Measure of Galaxy Structure?
Lisker, Thorsten
The Gini coefficient, a nonparametric measure of galaxy morphology, has recently taken up an important role in the automated identification of galaxy mergers. I present a critical assessment of its stability, based on a comparison of HST ACS imaging data from the GOODS and UDF surveys. Below a certain signal-to-noise level, the Gini coefficient de…
WFPC2 LRF Imaging of Emission-Line Nebulae in 3CR Radio Galaxies
Chiaberge, M.; Privon, G. C.; Sparks, W. +5 more
We present Hubble Space Telescope WFPC2 Linear Ramp Filter images of high surface brightness emission lines (either [O II], [O III], or H α + [N II]) in 80 3CR radio sources. We overlay the emission-line images on high-resolution VLA radio images (eight of which are new reductions of archival data) in order to examine the spatial relationship betw…
FERENGI: Redshifting Galaxies from SDSS to GEMS, STAGES, and COSMOS
Barden, M.; Häußler, B.; Jahnke, K.
We describe the creation of a set of artificially "redshifted" galaxies in the range 0.1 < z < 1.1 using a set of ~100 SDSS low-redshift (v < 7000 km s-1) images as input. The intention is to generate a training set of realistic images of galaxies of diverse morphologies and a large range of redshifts for the GEMS and COSMOS ga…