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Cassini Ion and Neutral Mass Spectrometer: Enceladus Plume Composition and Structure
Ip, Wing-Huen; McNutt, Ralph L.; Waite, J. Hunter +11 more
The Cassini spacecraft passed within 168.2 kilometers of the surface above the southern hemisphere at 19:55:22 universal time coordinated on 14 July 2005 during its closest approach to Enceladus. Before and after this time, a substantial atmospheric plume and coma were observed, detectable in the Ion and Neutral Mass Spectrometer (INMS) data set o…
The ACS Virgo Cluster Survey. VI. Isophotal Analysis and the Structure of Early-Type Galaxies
Jordán, Andrés; Tonry, John L.; Côté, Patrick +8 more
We present a detailed analysis of the morphology, isophotal parameters, and surface brightness profiles for 100 early-type members of the Virgo Cluster, from dwarfs (MB=-15.1 mag) to giants (MB=-21.8 mag), imaged in the g and z passbands using the Advanced Camera for Surveys on board the Hubble Space Telescope. Dust and compl…
The Sloan Lens ACS Survey. III. The Structure and Formation of Early-Type Galaxies and Their Evolution since z ~ 1
Treu, Tommaso; Koopmans, Léon V. E.; Bolton, Adam S. +2 more
We present a joint gravitational lensing and stellar-dynamical analysis of 15 massive field early-type galaxies selected from the Sloan Lens ACS (SLACS) Survey. The following numerical results are found: (1) A joint likelihood gives an average logarithmic density slope for the total mass density of <γ'>=2.01+0.02-0…
Cassini Encounters Enceladus: Background and the Discovery of a South Polar Hot Spot
Buratti, B. J.; Hendrix, A. R.; Spencer, J. R. +7 more
The Cassini spacecraft completed three close flybys of Saturn's enigmatic moon Enceladus between February and July 2005. On the third and closest flyby, on 14 July 2005, multiple Cassini instruments detected evidence for ongoing endogenic activity in a region centered on Enceladus' south pole. The polar region is the source of a plume of gas and d…
The ACS Virgo Cluster Survey. VIII. The Nuclei of Early-Type Galaxies
Jordán, Andrés; Tonry, John L.; Côté, Patrick +9 more
The ACS Virgo Cluster Survey is a Hubble Space Telescope program to obtain high-resolution imaging in widely separated bandpasses (F475W~g and F850LP~z) for 100 early-type members of the Virgo Cluster, spanning a range of ~460 in blue luminosity. We use this large, homogenous data set to examine the innermost structure of these galaxies and to cha…
High-Resolution Millimeter Imaging of Submillimeter Galaxies
Smail, I.; Genzel, R.; Tacconi, L. J. +8 more
We present ~0.6" resolution IRAM PdBI interferometry of eight submillimeter galaxies at z~2-3.4, where we detect continuum at 1 mm and/or CO lines at 3 and 1 mm. The CO 3-2/4-3 line profiles in five of the sources are double-peaked, indicative of orbital motion either in a single rotating disk or of a merger of two galaxies. The millimeter line an…
The Size Evolution of Galaxies since z~3: Combining SDSS, GEMS, and FIRES
van Dokkum, Pieter G.; Franx, Marijn; Labbé, Ivo +15 more
We present the evolution of the luminosity-size and stellar mass-size relations of luminous (LV>~3.4×1010 h-270 Lsolar) and massive (M*>~3×1010 h-270 Msolar) galaxies in the last ~11 Gyr. We use very deep near-infrared images of the …
Constraining Black Hole Spin via X-Ray Spectroscopy
Brenneman, Laura W.; Reynolds, Christopher S.
We present an analysis of the observed broad iron line feature and putative warm absorber in the long 2001 XMM-Newton observation of the Seyfert 1.2 galaxy MCG -06-30-15. The new kerrdisk model we have designed for simulating line emission from accretion disk systems allows black hole spin to be a free parameter in the fit, enabling the user to fo…
Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample
Gray, R. O.; Corbally, C. J.; Garrison, R. F. +5 more
We are obtaining spectra, spectral types, and basic physical parameters for the nearly 3600 dwarf and giant stars earlier than M0 in the Hipparcos catalog within 40 pc of the Sun. Here we report on results for 1676 stars in the southern hemisphere observed at Cerro Tololo Inter-American Observatory and Steward Observatory. These results include ne…
The cosmic infrared background resolved by Spitzer. Contributions of mid-infrared galaxies to the far-infrared background
Le Floc'h, E.; Dole, H.; Lagache, G. +7 more
Aims.We quantify the contributions of 24 µm galaxies to the Far-Infrared (FIR) Background at 70 and 160 µm. We provide new estimates of the Cosmic Infrared Background (CIB), and compare it with the Cosmic Optical Background (COB).
Methods: .Using Spitzer data at 24, 70 and 160 µm in three deep fields, we stacked more than 190…