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The Assembly of the Red Sequence at z ~ 1: The Color and Spectral Properties of Galaxies in the Cl1604 Supercluster
Surace, J. A.; Fassnacht, C. D.; Kocevski, D. D. +6 more
We investigate the properties of the 525 spectroscopically confirmed members of the Cl1604 supercluster at z ~ 0.9 as part of the Observations of Redshift Evolution in Large Scale Environments survey. In particular, we focus on the photometric, stellar mass, morphological, and spectral properties of the 305 member galaxies of the eight clusters an…
Gravity waves, cold pockets and CO2 clouds in the Martian mesosphere
Forget, F.; González-Galindo, F.; Spiga, A. +1 more
Many independent measurements have shown that extremely cold temperatures are found in the Martian mesosphere. These mesospheric “cold pockets” may result from the propagation of atmospheric waves. Recent observational achievements also hint at such cold pockets by revealing mesospheric clouds formed through the condensation of CO2, the…
Driving Saturn's magnetospheric periodicities from the upper atmosphere/ionosphere: Magnetotail response to dual sources
Kivelson, Margaret G.; Jia, Xianzhe
Despite the high degree of axial symmetry of Saturn's internal magnetic field, rotation-associated periodicities are evident in Saturn's electromagnetic radiation, its magnetic perturbations and its particle populations. Although close to the mean rotation period of the cloud tops, the electromagnetic period drifts slightly over a time scale of ye…
On the Role of Rotating Sunspots in the Activity of Solar Active Region NOAA 11158
Maurya, R. A.; Ambastha, A.; Vemareddy, P.
We study the role of rotating sunspots in relation to the evolution of various physical parameters characterizing the non-potentiality of the active region (AR) NOAA 11158 and its eruptive events using the magnetic field data from the Helioseismic and Magnetic Imager (HMI) and multi-wavelength observations from the Atmospheric Imaging Assembly (AI…
Outburst of GX 304-1 monitored with INTEGRAL: positive correlation between the cyclotron line energy and flux
Klochkov, D.; Santangelo, A.; Wilms, J. +10 more
Context. X-ray spectra of many accreting pulsars exhibit significant variations as a function of flux and thus of mass accretion rate. In some of these pulsars, the centroid energy of the cyclotron line(s), which characterizes the magnetic field strength at the site of the X-ray emission, has been found to vary systematically with flux.
Aims:…
Approximate Bayesian Computation for astronomical model analysis: a case study in galaxy demographics and morphological transformation at high redshift
Cameron, E.; Pettitt, A. N.
'Approximate Bayesian Computation' (ABC) represents a powerful methodology for the analysis of complex stochastic systems for which the likelihood of the observed data under an arbitrary set of input parameters may be entirely intractable - the latter condition rendering useless the standard machinery of tractable likelihood-based, Bayesian statis…
Global network of slow solar wind
Crooker, N. U.; Neugebauer, M.; Antiochos, S. K. +1 more
The streamer belt region surrounding the heliospheric current sheet (HCS) is generally treated as the primary or sole source of the slow solar wind. Synoptic maps of solar wind speed predicted by the Wang-Sheeley-Arge model during selected periods of solar cycle 23, however, show many areas of slow wind displaced from the streamer belt. These area…
The Near-infrared Background Intensity and Anisotropies during the Epoch of Reionization
Gong, Yan; Cooray, Asantha; Smidt, Joseph +1 more
A fraction of the extragalactic near-infrared (near-IR) background light involves redshifted photons from the ultraviolet (UV) emission from galaxies present during reionization at redshifts above 6. The absolute intensity and the anisotropies of the near-IR background provide an observational probe of the first-light galaxies and their spatial di…
Observation of interstellar lithium in the low-metallicity Small Magellanic Cloud
Mathews, Grant J.; Lehner, Nicolas; Howk, J. Christopher +1 more
The primordial abundances of light elements produced in the standard theory of Big Bang nucleosynthesis (BBN) depend only on the cosmic ratio of baryons to photons, a quantity inferred from observations of the microwave background. The predicted primordial 7Li abundance is four times that measured in the atmospheres of Galactic halo sta…
Titan's fluvial valleys: Morphology, distribution, and spectral properties
Sotin, C.; Barnes, J. W.; Brown, R. H. +11 more
Titan's fluvial channels have been investigated based on data obtained by the Synthetic Aperture Radar (SAR) instrument and the Visible and Infrared Mapping Spectrometer (VIMS) onboard the Cassini spacecraft. In this paper, a database of fluvial features is created based on radar-SAR data aiming to unveil the distribution and the morphologic and s…