Search Publications
Transformations between the Theoretical and Observational Planes in the Hubble Space Telescope NICMOS and WFPC2 Photometric Systems
Leitherer, Claus; Origlia, Livia
Color-temperature relations and bolometric corrections in the Hubble Space Telescope (HST) Near Infrared Camera and Multi-Object Spectrometer F1110W, F160W, and F222M and the Wide Field Planetary Camera 2 F439W, F555W, and F814W photometric systems, using two different sets of model atmospheres, have been derived. This database of homogeneous, sel…
Timescales of Disk Evolution and Planet Formation: HST, Adaptive Optics, and ISO Observations of Weak-Line and Post-T Tauri Stars
Brandner, Wolfgang; Alcalá, Juan M.; Covino, Elvira +7 more
We present high spatial resolution HST and ground-based adaptive optics observations and high-sensitivity ISO (ISOCAM & ISOPHOT) observations of a sample of X-ray selected weak-line (WTTS) and post- (PTTS) T Tauri stars located in the nearby Chamaeleon T and Scorpius-Centaurus OB associations. HST/NICMOS and adaptive optics observations aimed …
Stellar Populations in the Host Galaxies of Markarian 1014, IRAS 07598+6508, and Markarian 231
Stockton, Alan; Canalizo, Gabriela
We present deep spectroscopic and imaging data of the host galaxies of Mrk 1014, IRAS 07598+6508, and Mrk 231. These objects form part of both the QSO and the ultraluminous infrared galaxy (ULIG) families and may represent a transition stage in an evolutionary scenario. Our imaging shows that all three objects have highly perturbed hosts with tida…
Panchromatic Study of Nearby Ultraviolet-bright Starburst Galaxies: Implications for Massive Star Formation and High-Redshift Galaxies
Conselice, Christopher J.; Calzetti, Daniela; Gallagher, John S. +2 more
We present a panchromatic study of nearby starburst galaxies from the ultraviolet to the visible, including narrowband Hα using Wisconsin-Indiana-Yale-NOAO (WIYN) and Hubble Space Telescope data, to determine how star formation processes affect the morphologies and integrated fluxes of nearby starbursts. We find that the UV and Hα morphologies of …
Hubble Space Telescope Imaging of the Circinus Galaxy
Simpson, Chris; Storchi-Bergmann, T.; Barbosa, F. K. B. +3 more
We present a Hubble Space Telescope imaging study of the nearby (4 Mpc distant) Circinus galaxy, which contains the nearest type 2 Seyfert nucleus and prominent circumnuclear star formation. Images have been obtained in the [O III] λ5007, Hα, and H2 v=1-0 S(1) emission lines, and in the green (5470 Å), red (8140 Å), and near-infrared (2…
The Central Gas Systems of Early-Type Galaxies Traced by Dust Features, Based on the Hubble Space Telescope WFPC2 Archival Images
Takata, Tadafumi; Aoki, Kentaro; Watanabe, Masaru +2 more
We investigated the central gas systems of E/S0 galaxies by making use of the WFPC2 images in the Hubble Space Telescope archive. We searched for gas systems that were traced by the dust with a new method of making color excess images in F555W-F814W (V-I). Of 25 sample galaxies, we detected gas systems in 14 galaxies. The dust was newly detected i…
Luminous Infrared Galaxies. III. Multiple Merger, Extended Massive Star Formation, Galactic Wind, and Nuclear Inflow in NGC 3256
Taniguchi, Y.; Terlevich, R.; Lípari, S. +3 more
We report detailed evidence for multiple merger, extended massive star formation, galactic wind, and circular/noncircular motions in the luminous infrared galaxy NGC 3256, based on observations of high-resolution imaging (Hubble Space Telescope, ESO NTT), and extensive spectroscopic data (more than 1000 spectra, collected at Estación Astrofísica d…
Hubble Space Telescope Observations of the Planetary Nebula K648 in the Globular Cluster M15
Livio, Mario; Bond, Howard E.; Alves, David R.
We have obtained observations of the planetary nebula K648 in the Galactic globular cluster M15 with the Hubble Space Telescope's Wide Field Planetary Camera 2, covering an interval of 7 days. The frames provide both time-sampled broadband photometry of the central star and high-resolution images of the nebula in the light of Hα, [O III], and [N I…
Hubble Space Telescope/WFPC2 and VLA Observations of the Ionized Gas in the Dwarf Starburst Galaxy NGC 4214
Walborn, Nolan R.; MacKenty, John W.; Maíz-Apellániz, Jesús +2 more
We present new Hα and [O III] λ5007 narrowband images of the starbursting dwarf galaxy NGC 4214, obtained with the Wide Field and Planetary Camera (WFPC2) on board the Hubble Space Telescope (HST), together with VLA observations of the same galaxy. The HST images resolve features down to physical scales of 2-5 pc, revealing several young (<10 M…
The Spectroscopic and Astrometric Parallaxes of Three Dwarf Novae: The Nature of the Secondary Stars of U Geminorum, SS Aurigae, and SS Cygni
Harrison, Thomas E.; Szkody, Paula; Gilliland, Ronald L. +1 more
We compare the parallaxes of three dwarf novae obtained using the Fine Guidance Sensors on the Hubble Space Telescope with their ground-based infrared spectroscopic parallaxes to examine the nature of their secondary stars. We have used new optical spectroscopy of MK spectral-type standards to rework the spectroscopic parallaxes of the reference f…