Search Publications
Mid- to Far-Infrared Emission and Star Formation in Early-Type Galaxies
Bendo, George J.; Young, Lisa M.; Lucero, Danielle M.
Many early-type galaxies have been detected at wavelengths of 24-160 µm but the emission is usually dominated by heating from an active galactic nucleus or from the evolved stellar population. Here, we present Spitzer MIPS observations of a sample of elliptical and lenticular galaxies that are rich in cold molecular gas, and we investigate w…
Emission-Line Galaxies from the Hubble Space Telescope Probing Evolution and Reionization Spectroscopically (PEARS) Grism Survey. I. The South Fields
Hathi, Nimish P.; Gardner, Jonathan P.; Meurer, Gerhardt R. +14 more
We present results of a search for emission-line galaxies (ELGs) in the southern fields of the Hubble Space Telescope Probing Evolution And Reionization Spectroscopically (PEARS) grism survey. The PEARS South Fields consist of five Advanced Camera for Surveys pointings (including the Hubble Ultra Deep Field) with the G800L grism for a total of 120…
Speckle Interferometry at Mount Wilson Observatory: Observations Obtained in 2006-2007 and 35 New Orbits
Mason, Brian D.; Hartkopf, William I.
Results are presented for 607 speckle interferometric observations of double stars, as well as 222 measures of single stars or unresolved pairs. All data were obtained in 2006 and 2007 at the Mount Wilson Observatory, using the 2.5 m Hooker telescope. Separations range from 0farcs06 to 6farcs31, with a median of 0farcs34. These three observing run…
Spitzer Observations of Comet 67P/Churyumov-Gerasimenko at 5.5-4.3 AU from the Sun
Woodward, Charles E.; Tubiana, Cecilia; Kelley, Michael S. +3 more
We report Spitzer Space Telescope observations of comet 67P/Churyumov-Gerasimenko at 5.5 and 4.3 AU from the Sun, post-aphelion. Comet 67P is the primary target of the European Space Agency's Rosetta mission. The Rosetta spacecraft will rendezvous with the nucleus at heliocentric distances similar to our observations. Rotationally resolved observa…
Probing Star Formation at Low Metallicity: The Radio Emission of Super Star Clusters in SBS 0335-052
Hunt, Leslie K.; Johnson, Kelsey E.; Reines, Amy E.
We present high-resolution radio-continuum observations of the nascent starburst in the metal-poor galaxy SBS 0335-052. These radio data were taken with the Very Large Array and include observations at 0.7 cm, 1.3 cm, 2 cm, 3.6 cm, and 6 cm. These observations enable us to probe the thermal radio nebulae associated with the extremely young star-fo…
Young Stellar Populations and Star Clusters in NGC 1705
Greggio, L.; Tosi, M.; Montegriffo, P. +4 more
We present Hubble Space Telescope (HST) photometry of the late-type dwarf galaxy NGC 1705 observed with the Wide-Field Planetary Camera 2 (WFPC2) in the F380W and F439W bands and with the Advanced Camera for Surveys/High-Resolution Channel (HRC) in the F330W, F555W, and F814W broad-band filters. We cross-correlate these data with previous ones acq…
A Hubble Space Telescope/WFPC2 Survey of Bright Young Clusters in M31. III. Structural Parameters
Barmby, P.; Bellazzini, M.; Kissler-Patig, M. +6 more
Surface brightness profiles for 23 M31 star clusters were measured using images from the Wide Field Planetary Camera 2 on the Hubble Space Telescope, and fitted to two types of models to determine the clusters' structural properties. The clusters are primarily young (~108 yr) and massive (~104.5 M sun), with median…
Hubble Space Telescope Observations of an Extraordinary Flare in the M87 Jet
Madrid, Juan P.
HST-1, a knot along the M87 jet located 0farcs85 from the nucleus of the galaxy, has experienced dramatic and unexpected flaring activity since early 2000. We present analysis of Hubble Space Telescope near-ultraviolet (NUV) imaging of the M87 jet from 1999 May to 2006 December that reveals that the NUV intensity of HST-1 has increased 90 times ov…
Cool Subdwarf Investigations. II. Multiplicity
Henry, Todd J.; Mason, Brian D.; Jao, Wei-Chun +2 more
Cool subdwarfs of types K and M are the fainter counterparts of cool main-sequence dwarfs that dominate the Galactic population. In this paper, we present the results of an optical speckle survey of 62 confirmed cool subdwarf systems within 60 pc. We have resolved two new companions and confirmed two previously known companions with separations 0f…
Evidence for the Disky Origin of Luminous Virgo Dwarf Ellipticals from the Kinematics of Their Globular Cluster Systems
Brodie, Jean P.; Beasley, Michael A.; Strader, Jay +1 more
We report evidence for dynamically significant rotation in the globular cluster systems of two luminous Virgo dwarf ellipticals, VCC1261 and VCC1528. Including previous results for VCC1087, the globular cluster systems of all three Virgo dwarf ellipticals studied in detail to date exhibit v rot/σlos>1. Taking the rotation …