Search Publications
Active and Passive Galaxies at z ~ 2: Rest-frame Optical Morphologies with WFC3
Trenti, M.; Oesch, P. A.; Carollo, C. M. +5 more
We use the high angular resolution in the near-infrared of the Wide Field Camera 3 (WFC3) on the Hubble Space Telescope to determine YHVz color-color-selection criteria to identify and characterize 1.5 < z < 3.5 galaxies in the Hubble Ultra Deep Field 2009 (HUDF09) and Early Release Science (GOODS-South) fields. The WFC3 NIR images reveal ga…
The Sun's Small-scale Magnetic Elements in Solar Cycle 23
Zhao, H.; Wang, J. X.; Jin, C. L. +1 more
With the unique database from the Michelson Doppler Imager on board the Solar and Heliospheric Observatory in an interval embodying solar cycle 23, the cyclic behavior of solar small-scale magnetic elements is studied. More than 13 million small-scale magnetic elements are selected, and the following results are found. (1) The quiet regions domina…
Star Formation Efficiency in the Cool Cores of Galaxy Clusters
Veilleux, Sylvain; Rupke, David S. N.; Mushotzky, Richard +2 more
We have assembled a sample of high spatial resolution far-UV (Hubble Space Telescope Advanced Camera for Surveys/Solar Blind Channel) and Hα (Maryland-Magellan Tunable Filter) imaging for 15 cool core galaxy clusters. These data provide a detailed view of the thin, extended filaments in the cores of these clusters. Based on the ratio of the far-UV…
Imaging the Molecular Gas Properties of a Major Merger Driving the Evolution of a z = 2.5 Submillimeter Galaxy
Walter, Fabian; Hodge, Jacqueline; Riechers, Dominik A. +6 more
We report the detection of spatially extended CO(J = 1→0) and CO(J = 5→4) emission in the z = 2.49 submillimeter galaxy (SMG) J123707+6214, using the Expanded Very Large Array and the Plateau de Bure Interferometer. The large molecular gas reservoir is spatially resolved into two CO(J = 1→0) components (northeast and southwest; previously identifi…
A Census of Baryons and Dark Matter in an Isolated, Milky Way Sized Elliptical Galaxy
Fabian, Andrew C.; Canizares, Claude R.; Humphrey, Philip J. +2 more
We present a study of the dark and luminous matter in the isolated elliptical galaxy NGC 720, based on deep X-ray observations made with the Chandra and Suzaku observatories. The gas properties are reliably measured almost to R 2500, allowing us to place good constraints on the enclosed mass and baryon fraction (fb ) within t…
The Massive Progenitor of the Possible Type II-Linear Supernova 2009hd in Messier 66
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Foley, Ryan J. +11 more
We present early- and late-time photometric and spectroscopic observations of supernova (SN) 2009hd in the nearby spiral galaxy NGC 3627 (M66). This SN is one of the closest to us in recent years and provides an uncommon opportunity to observe and study the nature of SNe. However, the object was heavily obscured by dust, rendering it unusually fai…
PTF 10fqs: A Luminous Red Nova in the Spiral Galaxy Messier 99
Filippenko, Alexei V.; Cenko, S. Bradley; Law, Nicholas M. +39 more
The Palomar Transient Factory (PTF) is systematically charting the optical transient and variable sky. A primary science driver of PTF is building a complete inventory of transients in the local universe (distance less than 200 Mpc). Here, we report the discovery of PTF 10fqs, a transient in the luminosity "gap" between novae and supernovae. Locat…
The Pan-Pacific Planet Search. I. A Giant Planet Orbiting 7 CMa
Endl, Michael; Wittenmyer, Robert A.; Wang, Liang +3 more
We introduce the Pan-Pacific Planet Search, a survey of 170 metal-rich Southern Hemisphere subgiants using the 3.9 m Anglo-Australian Telescope. We report the first discovery from this program, a giant planet orbiting 7 CMa (HD 47205) with a period of 763 ± 17 days, eccentricity e = 0.14 ± 0.06, and msin i = 2.6 ± 0.6 M Jup. The host st…
Insights on the Formation, Evolution, and Activity of Massive Galaxies from Ultracompact and Disky Galaxies at z = 2-3
Papovich, Casey; Dickinson, Mark; Lucas, Ray A. +9 more
We present our results on the structure and activity of massive galaxies at z = 1-3 using one of the largest (166 with M sstarf >= 5 × 1010 M ⊙) and most diverse samples of massive galaxies derived from the GOODS-NICMOS survey: (1) Sérsic fits to deep NIC3 F160W images indicate that the rest-frame optical struct…
Optical Polarization and Spectral Variability in the M87 Jet
Perlman, Eric S.; Cara, Mihai; Sparks, William B. +10 more
During the last decade, M87's jet has been the site of an extraordinary variability event, with one knot (HST-1) increasing by over a factor 100 in brightness. Variability has also been seen on timescales of months in the nuclear flux. Here we discuss the optical-UV polarization and spectral variability of these components, which show vastly diffe…