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Are the Dorsa Argentea on Mars eskers?
Conway, Susan J.; Butcher, Frances E. G.; Arnold, Neil S.
The Dorsa Argentea are an extensive assemblage of ridges in the southern high latitudes of Mars. They have previously been interpreted as eskers formed by deposition of sediment in subglacial meltwater conduits, implying a formerly more extensive south polar ice sheet. In this study, we undertake the first large-scale statistical analysis of aspec…
Search for Hyperluminous Infrared Dust-obscured Galaxies Selected with WISE and SDSS
Toba, Y.; Nagao, T.
We aim to search for hyperluminous infrared (IR) galaxies (HyLIRGs) with IR luminosity {L}{{IR}} > 1013 L⊙ by applying the selection method of dust-obscured galaxies (DOGs). They are spatially rare but could correspond to a maximum phase of cosmic star formation (SF) and/or active galactic nucleus (AGN) activity…
Theoretical modelling of the AGN iron line vs. continuum time-lags in the lamp-post geometry
Papadakis, I. E.; Emmanoulopoulos, D.; Dovčiak, M. +4 more
Context. Theoretical modelling of time-lags between variations in the Fe Kα emission and the X-ray continuum might shed light on the physics and geometry of the X-ray emitting region in active galaxies (AGN) and X-ray binaries. We here present the results from a systematic analysis of time-lags between variations in two energy bands (5-7 vs. 2-4 k…
Monsters in the dark: predictions for luminous galaxies in the early Universe from the BLUETIDES simulation
Wilkins, Stephen M.; Nagai, Daisuke; Croft, Rupert +3 more
Using deep Hubble and Spitzer observations Oesch et al. have identified a bright (MUV ≈ -22) star-forming galaxy candidate at z ≈ 11. The presence of GN-z11 implies a number density ∼10-6 Mpc-3, roughly an order of magnitude higher than the expected value based on extrapolations from lower redshift. Using the unpre…
Controversial age spreads from the main sequence turn-off and red clump in intermediate-age clusters in the LMC
Cabrera-Ziri, I.; Bastian, N.; Kozhurina-Platais, V. +5 more
Most star clusters at an intermediate age (1-2 Gyr) in the Large and Small Magellanic Clouds show a puzzling feature in their color-magnitude diagrams (CMD) that is not in agreement with a simple stellar population. The main sequence turn-off of these clusters is much broader than expected from photometric uncertainties. One interpretation of this…
Cosmological constraint on the light gravitino mass from CMB lensing and cosmic shear
Osato, Ken; Yoshida, Naoki; Kamada, Ayuki +2 more
Light gravitinos of mass lesssim O (10) eV are of particular interest in cosmology, offering various baryogenesis scenarios without suffering from the cosmological gravitino problem. The gravitino may contribute considerably to the total matter content of the Universe and affect structure formation from early to present epochs. After the gravitino…
Erratic Flaring of BL Lac in 2012-2013: Multiwavelength Observations
Stern, Daniel; Baloković, Mislav; Grupe, Dirk +7 more
BL Lac, the eponymous blazar, flared to historically high levels at millimeter, infrared, X-ray, and gamma-ray wavelengths in 2012. We present observations made with Herschel, Swift, NuSTAR, Fermi, the Submillimeter Array, CARMA, and the VLBA in 2012-2013, including three months with nearly daily sampling at several wavebands. We have also conduct…
A Joint Chandra and Swift View of the 2015 X-ray Dust-scattering Echo of V404 Cygni
Brandt, W. N.; Smith, R.; Neilsen, J. +4 more
We present a combined analysis of the Chandra and Swift observations of the 2015 X-ray echo of V404 Cygni. Using a stacking analysis, we identify eight separate rings in the echo. We reconstruct the soft X-ray light curve of the 2015 June outburst using the high-resolution Chandra images and cross-correlations of the radial intensity profiles, ind…
The atmosphere of comet 67P/Churyumov-Gerasimenko diagnosed by charge-exchanged solar wind alpha particles
Kallio, E.; Gunell, H.; Behar, E. +6 more
Context. The ESA/Rosetta mission has been orbiting comet 67P/Churyumov-Gerasimenko since August 2014, measuring its dayside plasma environment. The ion spectrometer onboard Rosetta has detected two ion populations, one energetic with a solar wind origin (H+, He2+, He+), the other at lower energies with a cometary o…
Multi-spacecraft Observations and Transport Modeling of Energetic Electrons for a Series of Solar Particle Events in August 2010
Dresing, N.; Dröge, W.; Klassen, A. +1 more
During 2010 August a series of solar particle events was observed by the two STEREO spacecraft as well as near-Earth spacecraft. The events, occurring on August 7, 14, and 18, originated from active regions 11093 and 11099. We combine in situ and remote-sensing observations with predictions from our model of three-dimensional anisotropic particle …