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Quadrant asymmetry in the angular distribution of cosmic microwave background in the Planck satellite data
Vittorio, N.; Balbi, A.; Cabella, P. +3 more
Some peculiar features found in the angular distribution of the cosmic microwave background (CMB) measured by the Wilkinson Microwave Anisotropy Probe (WMAP) deserve further investigation. Among these peculiar features is the quadrant asymmetry, which is likely related to the north-south asymmetry. In this paper, we aim to extend the analysis of t…
HOPS 136: An Edge-on Orion Protostar near the End of Envelope Infall
Manoj, P.; Kounkel, Marina; Fischer, William J. +10 more
Edge-on protostars are valuable for understanding the disk and envelope properties of embedded young stellar objects, since the disk, envelope, and envelope cavities are all distinctly visible in resolved images and well constrained in modeling. Comparing Two Micron All Sky Survey, Wide-field Infrared Survey Explorer, Spitzer, Herschel, and APEX p…
Time-distance helioseismology: A new averaging scheme for measuring flow vorticity
Birch, A. C.; Gizon, L.; Langfellner, J.
Context. Time-distance helioseismology provides information about vector flows in the near-surface layers of the Sun by measuring wave travel times between points on the solar surface. Specific spatial averages of travel times have been proposed for distinguishing between flows in the east-west and north-south directions and measuring the horizont…
Masses and activity of AB Doradus B a/b. The age of the AB Dor quadruple system revisited
Schmitt, J. H. M. M.; Czesla, S.; Wolter, U. +4 more
We present a multiwavelength study of the close binary AB Dor Ba/b (Rst137B). Our study comprises astrometric orbit measurements, optical spectroscopy, X-ray and radio observations. Using all available adaptive optics images of AB Dor B taken with VLT/NACO from 2004 to 2009, we tightly constrain its orbital period to 360.6 ± 1.5 days. We present t…
Constraints on dark energy from new observations including Pan-STARRS
Zheng, Wei; Li, Mingzhe; Xia, Jun-Qing +3 more
In this paper, we set the new limits on the equation of state parameter (EoS) of dark energy with the observations of cosmic microwave background radiation (CMB) from Planck satellite, the type Ia supernovae from Pan-STARRS and the baryon acoustic oscillation (BAO). We consider two parametrization forms of EoS: a constant w and time evolving w(a)=…
Monte Carlo study of interaction between solar wind plasma and Venusian upper atmosphere
Barabash, S.; Stenberg, G.; Shematovich, V. I. +1 more
Isolated events of proton and alpha particle precipitation in the Venusian atmosphere were recorded with the use of the ASPERA-4 analyzer on board the ESA Venus Express spacecraft. Using a Monte Carlo simulation method for calculation of proton and alpha particle precipitations in the Venusian atmosphere, reflected and upward directed particle flu…
Molecular hydrogen from z = 0.0963 DLA towards the QSO J1619+3342
Muzahid, S.; Srianand, R.; Mohan, V. +1 more
We report the detection of H2 in a zabs = 0.0963 Damped Lyman α (DLA) system towards zem = 0.4716 QSO J1619+3342. This DLA has log N(H I) = 20.55 ± 0.10, 18.13 ≤ log N(H2) ≤ 18.40, [S/H] = -0.62 ± 0.13, [Fe/S] = -1.00 ± 0.17 and the molecular fraction - 2.11 ≤ log[f(H2)] ≤ -1.85. The inferred …
The nature of massive black hole binary candidates - II. Spectral energy distribution atlas
Hogg, David W.; Decarli, R.; Lusso, E. +5 more
Recoiling supermassive black holes (SMBHs) are considered one plausible physical mechanism to explain high velocity shifts between narrow and broad emission lines sometimes observed in quasar spectra. If the sphere of influence of the recoiling SMBH is such that only the accretion disc is bound, the dusty torus would be left behind, hence the SED …
Particle Energization during Solar Maximum: Diffusive Shock Acceleration at Multiple Shocks
Zank, G. P.; Neergaard Parker, L.
We present a model for the acceleration of particles at multiple shocks using an approach related to box models. A distribution of particles is diffusively accelerated inside the box while simultaneously experiencing decompression through adiabatic expansion and losses from the convection and diffusion of particles out of the box by either the met…
X-ray time delays from the Seyfert 2 galaxy IRAS 18325-5926
Vaughan, S.; Alston, W. N.; Lobban, A. P.
Using new XMM-Newton observations we detect hard X-ray time lags in the rapid variability of the Compton-thin Seyfert 2 galaxy IRAS 18325-5926. The higher-energy X-ray variations lag behind correlated lower-energy variations by up to ∼3 ks and the magnitude of the lag increases clearly with energy separation between the energy bands. We find that …