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The Evolution of Galaxy Mergers and Morphology at z < 1.2 in the Extended Groth Strip
Le Floc'h, E.; Papovich, C.; Cooper, M. +18 more
We present the quantitative rest-frame B morphological evolution and galaxy merger fraction at 0.2 < z < 1.2 as observed by the All-Wavelength Extended Groth Strip International Survey (AEGIS). We use the Gini coefficient and M20 to identify major mergers and classify galaxy morphology for a volume-limited sample of 3009 galaxies …
The presence of methane in the atmosphere of an extrasolar planet
Swain, Mark R.; Vasisht, Gautam; Tinetti, Giovanna
Molecules present in the atmospheres of extrasolar planets are expected to influence strongly the balance of atmospheric radiation, to trace dynamical and chemical processes, and to indicate the presence of disequilibrium effects. As molecules have the potential to reveal atmospheric conditions and chemistry, searching for them is a high priority.…
Weaker solar wind from the polar coronal holes and the whole Sun
McComas, D. J.; Goldstein, B. E.; Schwadron, N. A. +4 more
Observations of solar wind from both large polar coronal holes (PCHs) during Ulysses' third orbit showed that the fast solar wind was slightly slower, significantly less dense, cooler, and had less mass and momentum flux than during the previous solar minimum (first) orbit. In addition, while much more variable, measurements in the slower, in-ecli…
The Sloan Lens ACS Survey. V. The Full ACS Strong-Lens Sample
Treu, Tommaso; Schlegel, David J.; Gavazzi, Raphaël +5 more
We present the definitive data for the full sample of 131 strong gravitational lens candidates observed with the Advanced Camera for Surveys (ACS) aboard the Hubble Space Telescope by the Sloan Lens ACS (SLACS) Survey. All targets were selected for higher redshift emission lines and lower redshift continuum in a single Sloan Digital Sky Survey (SD…
Structure and Star Formation in Galaxies out to z = 3: Evidence for Surface Density Dependent Evolution and Upsizing
van Dokkum, Pieter G.; Franx, Marijn; Labbé, Ivo +3 more
We present an analysis of galaxies in the CDF-South. We find a tight relation to z = 3 between color and size at a given mass, with red galaxies being small, and blue galaxies being large. We show that the relation is driven by stellar surface density or inferred velocity dispersion: galaxies with high surface density are red and have low specific…
The Horizontal Magnetic Flux of the Quiet-Sun Internetwork as Observed with the Hinode Spectro-Polarimeter
Kubo, M.; Lites, B. W.; Ichimoto, K. +11 more
Observations of very quiet Sun using the Solar Optical Telescope/Spectro-Polarimeter (SOT/SP) aboard the Hinode spacecraft reveal that the quiet internetwork regions are pervaded by horizontal magnetic flux. The spatial average horizontal apparent flux density derived from wavelength-integrated measures of Zeeman-induced linear polarization is B
Detection of atmospheric haze on an extrasolar planet: the 0.55-1.05 µm transmission spectrum of HD 189733b with the HubbleSpaceTelescope
Moutou, C.; Pont, F.; Knutson, H. +2 more
The nearby transiting planet HD 189733b was observed during three transits with the Advanced Camera for Surveys of the Hubble Space Telescope in spectroscopic mode. The resulting time-series of 675 spectra covers the 550-1050 nm range, with a resolution element of ~8 nm, at extremely high accuracy (signal-to-noise ratio up to 10000 in 50-nm interv…
The timing of martian valley network activity: Constraints from buffered crater counting
Head, James W.; Fassett, Caleb I.
Valley networks, concentrations of dendritic channels that often suggest widespread pluvial and fluvial activity, have been cited as indicators that the climate of Mars differed significantly in the past from the present hyperarid cold desert conditions. Some researchers suggest that the change in climate was abrupt, while others favor a much more…
Size Evolution of the Most Massive Galaxies at 1.7 < z < 3 from GOODS NICMOS Survey Imaging
Dickinson, Mark; Conselice, Christopher J.; Bouwens, Rychard J. +3 more
We measure the sizes of 82 massive (M >= 1011 M⊙) galaxies at 1.7 <= z <= 3 utilizing deep HST NICMOS data taken in the GOODS North and South fields. Our sample is almost an order of magnitude larger than previous studies at these redshifts, providing the first statistical study of massive galaxy sizes at z > 2, c…
Galaxy merger morphologies and time-scales from simulations of equal-mass gas-rich disc mergers
Lotz, Jennifer M.; Primack, Joel R.; Jonsson, Patrik +1 more
A key obstacle to understanding the galaxy merger rate and its role in galaxy evolution is the difficulty in constraining the merger properties and time-scales from instantaneous snapshots of the real Universe. The most common way to identify galaxy mergers is by morphology, yet current theoretical calculations of the time-scales for galaxy distur…