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The Herschel view of the on-going star formation in the Vela-C molecular cloud
Hill, T.; White, G. J.; Rygl, K. L. J. +24 more
Aims: As part of the Herschel guaranteed time key programme "HOBYS", we present the PACS and SPIRE photometric survey of the star-forming region Vela-C, one of the nearest sites of low-to-high-mass star formation in the Galactic plane. Our main objectives are to take a census of the cold sources and to derive their mass distribution down to a…
The Birth of an Ultraluminous X-Ray Source in M83
Soria, Roberto; Blair, William P.; Whitmore, Bradley C. +4 more
A previously undetected (LX < 1036 erg s-1) source in the strongly star-forming galaxy M83 entered an ultraluminous state between 2009 August and 2010 December. It was first seen with Chandra on 2010 December 23 at LX ≈ 4 × 1039 erg s-1 and has remained ultraluminous through our …
Multi-color observations of short GRB afterglows: 20 events observed between 2007 and 2010
Greiner, J.; McBreen, S.; Hartmann, D. H. +18 more
We report on follow-up observations of 20 short-duration gamma-ray bursts (GRBs; T90 < 2 s) performed in g'r'i'z'JHKs with the Gamma-Ray Burst Optical Near-Infrared Detector (GROND) between mid-2007 and the end of 2010. This is one of the most comprehensive data sets on GRB afterglow observations of short bursts published …
Ion resonance acceleration by dipolarization fronts: analytic theory and spacecraft observation
Petrukovich, A. A.; Artemyev, A. V.; Lutsenko, V. N.
In this paper, we consider the mechanism of ion acceleration by dipolarization fronts in the Earth's magnetotail. The statistics of dipolarization front observations by Interball-tail have been collected from 1995 to 1998 (51 events). We demonstrate that near dipolarization fronts bursts of energetic ions are often observed with an average energy …
The ACS Nearby Galaxy Survey Treasury. X. Quantifying the Star Cluster Formation Efficiency of nearby Dwarf Galaxies
Johnson, L. Clifton; Fouesneau, Morgan; Seth, Anil C. +6 more
We study the relationship between the field star formation and cluster formation properties in a large sample of nearby dwarf galaxies. We use optical data from the Hubble Space Telescope and from ground-based telescopes to derive the ages and masses of the young (t age <~ 100 Myr) cluster sample. Our data provide the first constrain…
A Constant Limiting Mass Scale for Flat Early-type Galaxies from z ~ 1 to z = 0: Density Evolves but Shapes Do Not
Franx, Marijn; van der Wel, Arjen; Rix, Hans-Walter +1 more
We measure the evolution in the intrinsic shape distribution of early-type galaxies from z ~ 1 to z ~ 0 by analyzing their projected axis-ratio distributions. We extract a low-redshift sample (0.04 < z < 0.08) of early-type galaxies with very low star formation rates from the Sloan Digital Sky Survey, based on a color-color selection scheme …
Orbital identification of clays and carbonates in Gusev crater
Poulet, Francois; Carter, John
Gusev crater was selected as the landing site of one of the two NASA Mars Exploration Rovers because water once could have ponded within the crater and partly filled it with sediments as suggested by the presence of a feeder channel and the fluvial-lacustrine morphology of the in-filling. However, the paucity of mineralogical evidence for fluvial-…
Optical and Infrared Photometry of Globular Clusters in NGC 1399: Evidence for Color-Metallicity Nonlinearity
Jordán, Andrés; Peng, Eric W.; Ferrarese, Laura +3 more
We combine new Wide Field Camera 3 IR Channel (WFC3/IR) F160W (H 160) imaging data for NGC 1399, the central galaxy in the Fornax cluster, with archival F475W (g 475), F606W (V 606), F814W (I 814), and F850LP (z 850) optical data from the Advanced Camera for Surveys (ACS). The purely optical g…
The flow of interstellar dust into the solar system
Kempf, S.; Srama, R.; Grün, E. +3 more
Context. Interstellar dust (ISD) is a major component in the formation and evolution of stars, stellar systems, and planets. Astronomical observations of interstellar extinction and polarization, and of the infrared emission of the dust, are the most commonly used technique for characterizing interstellar dust. Besides this, the interstellar dust …
Unveiling the Physical Properties and Kinematics of Molecular Gas in the Antennae Galaxies (NGC 4038/9) through High-resolution CO (J = 3-2) Observations
Tamura, Yoichi; Wilson, Christine D.; Yun, Min S. +12 more
We present a ~1'' (100 pc) resolution 12CO (3-2) map of the nearby intermediate-stage interacting galaxy pair NGC 4038/9 (the Antennae galaxies) obtained with the Submillimeter Array. We find that half the CO (3-2) emission originates in the overlap region where most of the tidally induced star formation had been previously found in sho…