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Phase-resolved XMM-Newton and Swift Observations of WR 25
Pandey, J. C.; Pandey, S. B.; Karmakar, Subhajeet
We present an analysis of long-term X-ray and optical observations of the Wolf-Rayet binary, WR 25. Using archival data from observations with the XMM-Newton and the Swift observatories, spanning over ~10 yr, we show that WR 25 is a periodic variable in X-rays with a period of 208 ± 3 days. X-ray light curves in the 0.5-10.0 keV energy band show p…
The WFPC2 Ultraviolet Survey: The Blue Straggler Population in NGC 5824
O'Connell, R. W.; Dalessandro, E.; Sanna, N. +3 more
We have used a combination of high-resolution Hubble Space Telescope Wide Field Planetary Camera 2 and wide-field ground-based observations, in ultraviolet and optical bands, to study the blue straggler star population of the massive outer halo globular cluster NGC 5824 over its entire radial extent. We have computed the center of the cluster and …
Mars surface thermal inertia and heterogeneities from OMEGA/MEX
Bibring, J. -P.; Gondet, B.; Langevin, Y. +4 more
The thermophysical structure of the martian surface is the result of various processes that have shaped the martian surface through time. Previous dedicated heliosynchronous measurements of the thermal infrared (IR) flux of the martian surface have revealed the diversity of martian surface thermal properties, as well as its complexity linked to th…
The traces of anisotropic dark energy in light of Planck
Kunz, Martin; Cardona, Wilmar; Hollenstein, Lukas
We study a dark energy model with non-zero anisotropic stress, either linked to the dark energy density or to the dark matter density. We compute approximate solutions that allow to characterise the behaviour of the dark energy model and to assess the stability of the perturbations. We also determine the current limits on such an anisotropic stres…
Dielectric measurements and radar attenuation estimation of ice/basalt sand mixtures as martian Polar Caps analogues
Lauro, S. E.; Pettinelli, E.; Mattei, E. +3 more
The nature of the materials underlying the superficial deposits of Mars can be inferred, applying an inversion algorithm, from the data acquired by the orbiting HF radars MARSIS and SHARAD. This approach requires the knowledge of the electromagnetic properties of the shallow deposits and an accurate evaluation of the signal attenuation. The presen…
Radio-continuum study of Large Magellanic Cloud supernova remnant J0509-6731
Filipović, M. D.; Kothes, R.; Bozzetto, L. M. +2 more
We present a detailed study of Australia Telescope Compact Array observations (λ = 20, 13, 6 and 3 cm) of supernova remnant (SNR) J0509-6731 in the Large Magellanic Cloud. The remnant has a ring morphology with brightened regions towards the south-western limb. We also find a second brightened inner ring which is only seen in the radio continuum. …
The Radial Distribution of X-Ray Binaries and Globular Clusters in NGC 4649 and their Relation with the Local Stellar Mass Density
Zezas, A.; Luo, B.; Gallagher, J. S. +7 more
We investigate the radial distribution of the low-mass X-ray binary (LMXB) population in the elliptical galaxy NGC 4649, using Chandra and Hubble data to separate the field and globular cluster (GC) populations. GCs with LMXBs have the same radial distribution as the parent red and blue GCs. The radial profile of field LMXBs follows the V-band pro…
Scaling relations of cluster elliptical galaxies at z~ 1.3. Distinguishing luminosity and structural evolution
Poggianti, B. M.; Boutsia, K.; Fumana, M. +10 more
Context. We studied the size-surface brightness and the size-mass relations of a sample of 16 cluster elliptical galaxies in the mass range ~ 1010-2 × 1011 M⊙, which were morphologically selected in the cluster RDCS J0848+4453 at z = 1.27.
Aims: Our aim is to assess whether they have completed their mass growt…
Ultra-faint high-redshift galaxies in the Frontier Fields
Salvaterra, R.; Vanzella, E.; Ferrara, A. +1 more
By combining cosmological simulations with Frontier Field (FF) project lens models, we find that, in the most optimistic case, galaxies as faint as m ≈ 33-34 (AB magnitude at 1.6 µm) can be detected in the Frontier Fields. Such faint galaxies are hosted by dark matter haloes of mass ~109 M⊙ and dominate the ionizing pho…
Titan dune heights retrieval by using Cassini Radar Altimeter
Seu, R.; Poggiali, V.; Mastrogiuseppe, M. +2 more
The Cassini Radar is a Ku band multimode instrument capable of providing topographic and mapping information. During several of the 93 Titan fly-bys performed by Cassini, the radar collected a large amount of data observing many dune fields in multiple modes such as SAR, Altimeter, Scatterometer and Radiometer. Understanding dune characteristics, …