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Planck intermediate results. L. Evidence of spatial variation of the polarized thermal dust spectral energy distribution and implications for CMB B-mode analysis
Miville-Deschênes, M. -A.; Boulanger, F.; Bernard, J. -P. +156 more
The characterization of the Galactic foregrounds has been shown to be the main obstacle in thechallenging quest to detect primordial B-modes in the polarized microwave sky. We make use of the Planck-HFI 2015 data release at high frequencies to place new constraints on the properties of the polarized thermal dust emission at high Galactic latitudes…
X-Ray Counterpart of Gravitational Waves Due to Binary Neutron Star Mergers: Light Curves, Luminosity Function, and Event Rate Density
Sun, Hui; Zhang, Bing; Gao, He
Zhang proposed a type of GRB-less X-ray transient associated with double neutron star (NS-NS) mergers under the conjecture of a rapidly spinning magnetar merger product with the line of sight off the short gamma-ray burst (GRB) jet. We investigate possible light curves of these transients by considering different observers’ viewing angles. We perf…
SAPS/SAID revisited: A causal relation to the substorm current wedge
Mishin, Evgeny; Nishimura, Yukitoshi; Foster, John
We present multispacecraft observations of enhanced flow/electric field channels in the inner magnetosphere and conjugate subauroral ionosphere, i.e., subauroral polarization streams (SAPS) near dusk and subauroral ion drifts (SAID) near midnight. The channels collocate with ring current (RC) injections lagging the onset of substorms by a few to ∼…
Stars caught in the braking stage in young Magellanic Cloud clusters
D'Antona, Francesca; Milone, Antonino P.; Tailo, Marco +3 more
The colour-magnitude diagrams of many Magellanic Cloud clusters (with ages up to 2 billion years) display extended turnoff regions where the stars leave the main sequence, suggesting the presence of multiple stellar populations with ages that may differ even by hundreds of millions of years 1,2,3 . A strongly debated question is whether…
Forecasting the Impact of Stellar Activity on Transiting Exoplanet Spectra
Line, Michael R.; Zellem, Robert T.; Ciardi, David R. +8 more
Exoplanet host star activity, in the form of unocculted starspots or faculae, alters the observed transmission and emission spectra of the exoplanet. This effect can be exacerbated when combining data from different epochs if the stellar photosphere varies between observations due to activity. Here, we present a method to characterize and correct …
The two-component giant radio halo in the galaxy cluster Abell 2142
Brunetti, G.; Rossetti, M.; Shimwell, T. W. +9 more
Aims: We report on a spectral study at radio frequencies of the giant radio halo in A 2142 (z = 0.0909), which we performed to explore its nature and origin. The optical and X-ray properties of the cluster suggest that A 2142 is not a major merger and the presence of a giant radio halo is somewhat surprising.
Methods: We performed deep r…
Variable Dynamics in the Inner Disk of HD 135344B Revealed with Multi-epoch Scattered Light Imaging
Kraus, Stefan; Milli, Julien; Benisty, Myriam +12 more
We present multi-epoch Very Large Telescope/Spectro-Polarimetric High-contrast Exoplanet REsearch (VLT/SPHERE) observations of the protoplanetary disk around HD 135344B (SAO 206462). The J-band scattered light imagery reveal, with high spatial resolution (∼41 mas, 6.4 au), the disk surface beyond ∼20 au. Temporal variations are identified in the a…
Suzaku observations of the merging galaxy cluster Abell 2255: The northeast radio relic
Zhang, Y. -Y.; Kaastra, J. S.; Fukazawa, Y. +12 more
We present the results of deep 140 ks Suzaku X-ray observations of the north-east (NE) radio relic of the merging galaxy cluster Abell 2255. The temperature structure of Abell 2255 is measured out to 0.9 times the virial radius (1.9 Mpc) in the NE direction for the first time. The Suzaku temperature map of the central region suggests a complex tem…
Intergalactic Lyman continuum photon budget in the past 5 billion years
Khaire, Vikram; Srianand, Raghunathan; Choudhury, Tirthankar Roy +1 more
We constrain the H I photoionization rate (Γ _{H I}) at z ≲ 0.45 by comparing the flux probability distribution function and power spectrum of the Lyα forest data along 82 Quasi-Stellar Object (QSO) sightlines obtained using Cosmic Origins Spectrograph with models generated from smoothed particle hydrodynamic simulations. We have developed a modul…
Swift observations of V404 Cyg during the 2015 outburst: X-ray outflows from super-Eddington accretion
Altamirano, D.; Sanna, A.; Knigge, C. +11 more
The black hole (BH) binary V404 Cyg entered the outburst phase in 2015 June after 26 yr of X-ray quiescence, and with its behaviour broke the outburst evolution pattern typical of most BH binaries. We observed the entire outburst with the Swift satellite and performed time-resolved spectroscopy of its most active phase, obtaining over a thousand s…