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Dust and gas in luminous proto-cluster galaxies at z = 4.05: the case for different cosmic dust evolution in normal and starburst galaxies
Daddi, E.; Elbaz, D.; Béthermin, M. +14 more
We measure the dust and gas content of the three submillimeter galaxies (SMGs) in the GN20 proto-cluster at z = 4.05 using new IRAM Plateau de Bure interferometer (PdBI) CO(4-3) and 1.2-3.3 mm continuum observations. All these three SMGs are heavily dust obscured, with UV-based star formation rate (SFR) estimates significantly smaller than the one…
A hidden reservoir of Fe/FeS in interstellar silicates?
Ysard, N.; Jones, A.; Köhler, M.
Context. The depletion of iron and sulphur into dust in the interstellar medium and the exact nature of interstellar amorphous silicate grains is still an open question.
Aims: We study the incorporation of iron and sulphur into amorphous silicates of olivine- and pyroxene-types and their effects on the dust spectroscopy and thermal emission. …
Infall of Nearby Galaxies into the Virgo Cluster as Traced with Hubble Space Telescope
Dolphin, Andrew E.; Wu, Po-Feng; Shaya, Edward J. +2 more
We measured the tip of the red giant branch distances to nine galaxies in the direction to the Virgo cluster using the Advanced Camera for Surveys on the Hubble Space Telescope. These distances put seven galaxies (GR 34, UGC 7512, NGC 4517, IC 3583, NGC 4600, VCC 2037, and KDG 215) in front of Virgo and two galaxies (IC 3023 and KDG 177) likely in…
Standard Rulers, Candles, and Clocks from the Low-Redshift Universe
Verde, Licia; Jimenez, Raul; Heavens, Alan
We measure the length of the baryon acoustic oscillation (BAO) feature, and the expansion rate of the recent Universe, from low-redshift data only, almost model independently. We make only the following minimal assumptions: homogeneity and isotropy, a metric theory of gravity, a smooth expansion history, and the existence of standard candles (supe…
Far-Infrared Surveys of Galaxy Evolution
Lutz, Dieter
Roughly half of the radiation from evolving galaxies in the early Universe reaches us in the far-infrared and submillimeter wavelength ranges. Recent major advances in observing capabilities, in particular the launch of the Herschel Space Observatory in 2009, have dramatically enhanced our ability to use this information in the context of multiwav…
Molecular Gas in the X-Ray Bright Group NGC 5044 as Revealed by ALMA
Ohyama, Youichi; Brighenti, Fabrizio; Jones, Christine +17 more
An ALMA observation of the early-type galaxy NGC 5044, which resides at the center of an X-ray bright group with a moderate cooling flow, detected 24 molecular structures within the central 2.5 kpc. The masses of the molecular structures vary from 3 × 105 M ⊙ to 107 M ⊙ and the CO(2-1) linewidths vary fr…
Warm Breeze from the Starboard Bow: a New Population of Neutral Helium in the Heliosphere
Wurz, P.; McComas, D. J.; Fuselier, S. A. +9 more
We investigate the signals from neutral helium atoms observed in situ from Earth orbit in 2010 by the Interstellar Boundary Explorer (IBEX). The full helium signal observed during the 2010 observation season can be explained as a superposition of pristine neutral interstellar He gas and an additional population of neutral helium that we call the W…
Herschel Multitiered Extragalactic Survey: clusters of dusty galaxies uncovered by Herschel and Planck
Pérez-Fournon, I.; Clements, D. L.; de Zotti, G. +21 more
The potential for Planck to detect clusters of dusty, star-forming galaxies at z > 1 is tested by examining the Herschel-SPIRE images of Planck Early Release Compact Source Catalog sources lying in fields observed by the Herschel Multitiered Extragalactic Survey. Of the 16 Planck sources that lie in the ∼90 sq. deg. examined, we find that 12 ar…
The ACS LCID Project. X. The Star Formation History of IC 1613: Revisiting the Over-cooling Problem
Ferguson, Henry C.; Dolphin, Andrew E.; Skillman, Evan D. +13 more
We present an analysis of the star formation history (SFH) of a field near the half-light radius in the Local Group dwarf irregular galaxy IC 1613 based on deep Hubble Space Telescope Advanced Camera for Surveys imaging. Our observations reach the oldest main sequence turn-off, allowing a time resolution at the oldest ages of ~1 Gyr. Our analysis …
Near-infrared transmission spectrum of the warm-Uranus GJ 3470b with the Wide Field Camera-3 on the Hubble Space Telescope
Ségransan, D.; Bonfils, X.; Ehrenreich, D. +7 more
The atmospheric composition of super-Earths and Neptunes is the object of intense observational and theoretical investigations. Transmission spectra recently obtained for such exoplanets are featureless in the near infrared. This flat signature is attributed to the presence of optically-thick clouds or translucent hazes. The planet