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Star formation history of And XVIII: a dwarf spheroidal galaxy in isolation
Rizzi, L.; Karachentsev, I. D.; Makarova, L. N. +2 more
We present a photometric study of the Andromeda XVIII dwarf spheroidal galaxy associated with M31, and situated well outside of the virial radius of the M31 halo. The galaxy was resolved into stars with Hubble Space Telescope/Advanced Camera for Surveys (HST/ACS) revealing the old red giant branch and red clump. With the new observational data, we…
The near-surface electron radiation environment of Saturn's moon Mimas
Coates, A. J.; Jones, G. H.; Hendrix, A. R. +4 more
Saturn's inner mid-size moons are exposed to a number of external weathering processes, including charged particle bombardment and UV photolysis, as well as deposition of E-ring grains and interplanetary dust. While optical remote sensing observations by several instruments onboard the Cassini spacecraft have revealed a number of weathering patter…
Inversion of the decay of the cyclotron line energy in Hercules X-1
Harrison, F.; Klochkov, D.; Wilms, J. +3 more
Recent observations of Her X-1 with NuSTAR and INTEGRAL in 2016 have provided evidence that the 20-year decay of the cyclotron line energy found between 1996 and 2015 has ended and that an inversion with a new increase, possibly similar to the one observed around 1990-1993, has started. We consider this a strong motivation for further observations…
The δ Scuti pulsations of β Pictoris as observed by ASTEP from Antarctica
Christille, J. -M.; Lagrange, A. -M.; Chapellier, E. +13 more
Aims: The Antarctica Search for Transiting Extrasolar Planets (ASTEP), an automatized 400 mm telescope located at Concordia station in Antarctica, monitored β Pictoris continuously to detect any variability linked to the transit of the Hill sphere of its planet β Pictoris b. The long observation sequence, from March to September 2017, combine…
Models for 60 double-lined binaries containing giants
Eggleton, Peter P.; Yakut, Kadri
The observed masses, radii and temperatures of 60 medium- to long-period binaries, most of which contain a cool, evolved star and a hotter less evolved one, are compared with theoretical models which include (a) core convective overshooting, (b) mass-loss, possibly driven by dynamo action as in RS CVn binaries, and (c) tidal friction, including it…
Integrated cosmological probes: Extended analysis
Amara, Adam; Refregier, Alexandre; Nicola, Andrina
Recent progress in cosmology has relied on combining different cosmological probes. In an earlier work, we implemented an integrated approach to cosmology where the probes are combined into a common framework at the map level. This has the advantage of taking full account of the correlations between the different probes, to provide a stringent tes…
A Hubble Diagram for Quasars
Risaliti, Guido; Lusso, Elisabeta; Bisogni, Susanna
The cosmological model is at present not tested between the redshift of the farthest observed supernovae (z 1.4) and that of the Cosmic Microwave Background (z 1,100). Here we introduce a new method to measure the cosmological parameters: we show that quasars can be used as “standard candles” by employing the non-linear relation between their intr…
Small Coronal Holes Near Active Regions as Sources of Slow Solar Wind
Wang, Y. -M.
We discuss the nature of the small areas of rapidly diverging, open magnetic flux that form in the strong unipolar fields at the peripheries of active regions (ARs), according to coronal extrapolations of photospheric field measurements. Because such regions usually have dark counterparts in extreme-ultraviolet (EUV) images, we refer to them as co…
Investigation of diurnal variability of water vapor in Enceladus' plume by the Cassini ultraviolet imaging spectrograph
Hansen, C. J.; Hendrix, A. R.; Portyankina, G. +4 more
An occultation of ɛ Orionis by Enceladus' plume was observed with Enceladus at an orbital longitude near apoapsis in order to investigate whether water vapor flow is modulated diurnally, similar to ice particles. The occultation showed that the bulk water vapor emanating from Enceladus changes little with orbital position. The amount of gas in at …
Void Profile from Planck Lensing Potential Map
Sawangwit, Utane; Chantavat, Teeraparb; Wandelt, Benjamin D.
We use the lensing potential map from Planck CMB lensing reconstruction analysis and the “Public Cosmic Void Catalog” to measure the stacked void lensing potential. We have made an attempt to fit the HSW void profile parameters from the stacked lensing potential. In this profile, four parameters are needed to describe the shape of voids with diffe…