5
5.0
Jun 30, 2018
06/18
by
A. Skopal; H. Drechsel; T. N. Tarasova; T. Kato; M. Fujii; F. Teyssier; O. Garde; J. Guarro; J. Edlin; C. Buil; D. Antao; J. N. Terry; T. Lemoult; S. Charbonnel; T. Bohlsen; A. Favaro; K. Graham
texts
eye 5
favorite 0
comment 0
We determine the temporal evolution of the luminosity L(WD), radius R(WD) and effective temperature Teff of the white dwarf (WD) pseudophotosphere of V339 Del from its discovery to around day 40. Another main objective was studying the ionization structure of the ejecta. These aims were achieved by modelling the optical/near-IR spectral energy distribution (SED) using low-resolution spectroscopy (3500 - 9200 A), UBVRcIc and JHKLM photometry. During the fireball stage (Aug. 14.8 - 19.9, 2013),...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1407.8212
4
4.0
Jun 30, 2018
06/18
by
Anna M. Barry; F. Hajir; P. G. Kevrekidis
texts
eye 4
favorite 0
comment 0
In this work, we construct suitable generating functions for vortices of alternating signs in the realm of Bose-Einstein condensates. In addition to the vortex-vortex interaction included in earlier fluid dynamics constructions of such functions, the vortices here precess around the center of the trap. This results in the generating functions of the vortices of positive charge and of negative charge satisfying a modified, so-called, Tkachenko differential equation. From that equation, we...
Topics: Nonlinear Sciences, Quantum Gases, Mathematics, Pattern Formation and Solitons, Mathematical...
Source: http://arxiv.org/abs/1407.7965
7
7.0
Jun 30, 2018
06/18
by
Donghui Jeong; Fabian Schmidt
texts
eye 7
favorite 0
comment 0
We review recent studies that rigorously define several key observables of the large-scale structure of the Universe in a general relativistic context. Specifically, we consider i) redshift perturbation of cosmic clock events; ii) distortion of cosmic rulers, including weak lensing shear and magnification; iii) observed number density of tracers of the large-scale structure. We provide covariant and gauge-invariant expressions of these observables. Our expressions are given for a linearly...
Topics: Astrophysics, General Relativity and Quantum Cosmology, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1407.7979
3
3.0
Jun 30, 2018
06/18
by
Farhad A. Goodarzi; Daewon Lee; Taeyoung Lee
texts
eye 3
favorite 0
comment 0
We derived a coordinate-free form of equations of motion for a complete model of a quadrotor UAV with a payload which is connected via a flexible cable according to Lagrangian mechanics on a manifold. The flexible cable is modeled as a system of serially-connected links and has been considered in the full dynamic model. A geometric nonlinear control system is presented to exponentially stabilize the position of the quadrotor while aligning the links to the vertical direction below the...
Topics: Mathematics, Optimization and Control
Source: http://arxiv.org/abs/1407.8164
5
5.0
Jun 30, 2018
06/18
by
Fernando Cordero; Lavinia Perez-Ostafe
texts
eye 5
favorite 0
comment 0
We study the arbitrage opportunities in the presence of transaction costs in a sequence of binary markets approximating the fractional Black-Scholes model. This approximating sequence was constructed by Sottinen and named fractional binary markets. Since, in the frictionless case, these markets admit arbitrage, we aim to determine the size of the transaction costs needed to eliminate the arbitrage from these models. To gain more insight, we first consider only 1-step trading strategies and we...
Topics: Probability, Mathematics, Quantitative Finance, Pricing of Securities
Source: http://arxiv.org/abs/1407.8068
5
5.0
Jun 30, 2018
06/18
by
Franziska Jahnke; Jochen Koenigsmann
texts
eye 5
favorite 0
comment 0
Admitting a non-trivial $p$-henselian valuation is a weaker assumption on a field than admitting a non-trivial henselian valuation. Unlike henselianity, $p$-henselianity is an elementary property in the language of rings. We are interested in the question when a field admits a non-trivial 0-definable $p$-henselian valuation (in the language of rings). We give a classification of elementary classes of fields in which the canonical $p$-henselian valuation is uniformly 0-definable. We then apply...
Topics: Mathematics, Logic, Commutative Algebra
Source: http://arxiv.org/abs/1407.8156
3
3.0
Jun 30, 2018
06/18
by
Frederic Legoll; William Minvielle
texts
eye 3
favorite 0
comment 0
We consider a variance reduction approach for the stochastic homogenization of divergence form linear elliptic problems. Although the exact homogenized coefficients are deterministic, their practical approximations are random. We introduce a control variate technique to reduce the variance of the computed approximations of the homogenized coefficients. Our approach is based on a surrogate model inspired by a defect-type theory, where a perfect periodic material is perturbed by rare defects....
Topics: Mathematics, Numerical Analysis, Probability
Source: http://arxiv.org/abs/1407.8029
4
4.0
Jun 30, 2018
06/18
by
Friedrich Knop; Bernhard Krötz; Eitan Sayag; Henrik Schlichtkrull
texts
eye 4
favorite 0
comment 0
We apply the local structure theorem and the polar decomposition to a real spherical space Z=G/H and control the volume growth on Z. We define the Harish-Chandra Schwartz space on Z. We give a geometric criterion to ensure $L^p$-integrability of matrix coefficients on Z.
Topics: Mathematics, Representation Theory
Source: http://arxiv.org/abs/1407.8006
5
5.0
Jun 30, 2018
06/18
by
G. Bruni; J. I. González-Serrano; M. Pedani; C. R. Benn; K. -H. Mack; J. Holt; F. M. Montenegro-Montes; F. Jiménez-Luján
texts
eye 5
favorite 0
comment 0
Broad absorption lines (BALs) are present in the spectra of ~20% of quasars (QSOs); this indicates fast outflows (up to 0.2c) that intercept the observer's line of sight. These QSOs can be distinguished again into radio-loud (RL) BAL QSOs and radio-quiet (RQ) BAL QSOs. The first are very rare, even four times less common than RQ BAL QSOs. The reason for this is still unclear and leaves open questions about the nature of the BAL-producing outflows and their connection with the radio jet. We...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1407.7987
5
5.0
Jun 30, 2018
06/18
by
J. S. Sanders; A. C. Fabian; J. Hlavacek-Larrondo; H. R. Russell; G. B. Taylor; F. Hofmann; G. Tremblay; S. A. Walker
texts
eye 5
favorite 0
comment 0
We present Chandra X-ray Observatory observations of the core of the galaxy cluster PKS 0745-191. Its centre shows X-ray cavities caused by AGN feedback and cold fronts with an associated spiral structure. The cavity energetics imply they are powerful enough to compensate for cooling. Despite the evidence for AGN feedback, the Chandra and XMM-RGS X-ray spectra are consistent with a few hundred solar masses per year cooling out of the X-ray phase, sufficient to power the emission line nebula....
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1407.8008
3
3.0
Jun 30, 2018
06/18
by
J. Vural; S. Kraus; A. Kreplin; G. Weigelt; E. Fossat; F. Massi; K. Perraut; F. Vakili
texts
eye 3
favorite 0
comment 0
Context: The structure of the inner disk of Herbig Be stars is not well understood. The continuum disks of several Herbig Be stars have inner radii that are smaller than predicted by models of irradiated disks with optically thin holes. Aims: We study the size of the inner disk of the Herbig B[e] star HD 85567 and compare the model radii with the radius suggested by the size-luminosity relation. Methods: The object was observed with the AMBER instrument of the Very Large Telescope...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1407.8190
4
4.0
Jun 30, 2018
06/18
by
L. Amati; J. Braga; F. Frontera; C. Labanti; M. Feroci; R. Hudec; A. Gomboc; R. Ruffini; A. Santangelo; A. Vacchi; R. Campana; Y. Evangelista; F. Fuschino; R. Salvaterra; G. Stratta; G. Tagliaferri; C. Guidorzi; P. Rosati; L. Titarchuk; A. Penacchioni; L. Izzo; N. Zampa; T. Rodic; on behalf of the GAME collaboration
texts
eye 4
favorite 0
comment 0
We describe the GRB and All-sky Monitor Experiment (GAME) mission submitted by a large international collaboration (Italy, Germany, Czech Repubblic, Slovenia, Brazil) in response to the 2012 ESA call for a small mission opportunity for a launch in 2017 and presently under further investigation for subsequent opportunities. The general scientific objective is to perform measurements of key importance for GRB science and to provide the wide astrophysical community of an advanced X-ray all-sky...
Topics: Instrumentation and Methods for Astrophysics, High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1407.8126
7
7.0
Jun 30, 2018
06/18
by
Leandro Cagliero; Fernando Szechtman
texts
eye 7
favorite 0
comment 0
Let ${\mathfrak g}$ be a finite dimensional Lie algebra over a field of characteristic 0, with solvable radical ${\mathfrak r}$ and nilpotent radical ${\mathfrak n}=[{\mathfrak g},{\mathfrak r}]$. Given a finite dimensional ${\mathfrak g}$-module $U$, its nilpotency series $ 0\subset U({\mathfrak n}^1)\subset\cdots\subset U({\mathfrak n}^m)=U$ is defined so that $U({\mathfrak n}^1)$ is the 0-weight space of ${\mathfrak n}$ in $U$, $U({\mathfrak n}^2)/U({\mathfrak n}^1)$ is the 0-weight space of...
Topics: Mathematics, Representation Theory
Source: http://arxiv.org/abs/1407.8125
7
7.0
Jun 30, 2018
06/18
by
M. L. Parker; D. R. Wilkins; A. C. Fabian; D. Grupe; T. Dauser; G. Matt; F. A. Harrison; L. Brenneman; S. E. Boggs; F. E. Christensen; W. W. Craig; L. C. Gallo; C. J. Hailey; E. Kara; S. Komossa; A. Marinucci; J. M. Miller; G. Risaliti; D. Stern; D. J. Walton; W. W. Zhang
texts
eye 7
favorite 0
comment 0
We present 3-50 keV NuSTAR observations of the AGN Mrk 335 in a very low flux state. The spectrum is dominated by very strong features at the energies of the iron line at 5-7 keV and Compton hump from 10-30 keV. The source is variable during the observation, with the variability concentrated at low energies, which suggesting either a relativistic reflection or a variable absorption scenario. In this work we focus on the reflection interpretation, making use of new relativistic reflection models...
Topics: High Energy Astrophysical Phenomena, Astrophysics
Source: http://arxiv.org/abs/1407.8223
3
3.0
Jun 30, 2018
06/18
by
P. Popesso; A. Biviano; A. Finoguenov; D. Wilman; M. Salvato; B. Magnelli; C. Gruppioni; F. Pozzi; G. Rodighiero; F. Ziparo; S. Berta; D. Elbaz; M. Dickinson; D. Lutz; B. Altieri; H. Aussel; A. Cimatti; D. Fadda; O. Ilbert; E. Le Floch; R. Nordon; A. Poglitsch; C. K. Xu
texts
eye 3
favorite 0
comment 0
There is now a large consensus that the current epoch of the Cosmic Star Formation History (CSFH) is dominated by low mass galaxies while the most active phase at 1~1, the most IR-luminous galaxies (LIRGs and ULIRGs) are preferentially located in groups, and this is consistent with a reversal of the star-formation rate vs .density anti-correlation observed in the nearby Universe. At these redshifts, group galaxies contribute 60-80% of the CSFH, i.e. much more than at lower redshifts. Below z~1,...
Topics: Astrophysics of Galaxies, Astrophysics, Cosmology and Nongalactic Astrophysics
Source: http://arxiv.org/abs/1407.8214
6
6.0
Jun 30, 2018
06/18
by
P. Popesso; A. Biviano; A. Finoguenov; D. Wilman; M. Salvato; B. Magnelli; C. Gruppioni; F. Pozzi; G. Rodighiero; F. Ziparo; S. Berta; D. Elbaz; M. Dickinson; D. Lutz; B. Altieri; H. Aussel; A. Cimatti; D. Fadda; O. Ilbert; E. Le Floch; R. Nordon; A. Poglitsch; S. Genel; C. K. Xu
texts
eye 6
favorite 0
comment 0
The most striking feature of the Cosmic Star Formation History (CSFH) of the Universe is a dramatic drop of the star formation (SF) activity, since z~1. In this work we investigate if the very same process of assembly and growth of structures is one of the major drivers of the observed decline. We study the contribution to the CSFH of galaxies in halos of different masses. This is done by studying the total SFR-halo mass-redshift plane from redshift 0 to redshift z~1.6 in a sample of 57 groups...
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1407.8231
3
3.0
Jun 30, 2018
06/18
by
S. C. C. Barros; J. M. Almenara; M. Deleuil; R. F. Diaz; Sz Csizmadia; J. Cabrera; S. Chaintreuil; A. Collier Cameron; A. Hatzes; R. Haywood; A. F. Lanza; S. Aigrain; R. Alonso; R. Bordé; F. Bouchy; H. J. Deeg; A. Erikson; M. Fridlund; S. Grziwa; D. Gandolfi; T. Guillot; E. Guenther; A. Leger; C. Moutou; M. Ollivier; T. Pasternacki; M. Patzold; H. Rauer; D. Rouan; A. Santerne; J. Schneider; G. Wuchterl
texts
eye 3
favorite 0
comment 0
CoRoT-7b, the first super-Earth with measured radius discovered, has opened the new field of rocky exoplanets characterisation. To better understand this interesting system, new observations were taken with the CoRoT satellite. During this run 90 new transits were obtained in the imagette mode. These were analysed together with the previous 151 transits obtained in the discovery run and HARPS radial velocity observations to derive accurate system parameters. A difference is found in the...
Topics: Earth and Planetary Astrophysics, Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1407.8099
5
5.0
Jun 30, 2018
06/18
by
S. Kaviraj; M. Huertas-Company; S. Cohen; S. Peirani; R. A. Windhorst; R. W. O'Connell; J. Silk; M. A. Dopita; N. P. Hathi; A. M. Koekemoer; S. Mei; M. Rutkowski; R. E. Ryan; F. Shankar
texts
eye 5
favorite 0
comment 0
We study of the role of major mergers (mass ratios >1:4) in driving size growth in high-redshift (1 10^10.7 MSun SGs at z
Topics: Astrophysics of Galaxies, Astrophysics
Source: http://arxiv.org/abs/1407.8185
3
3.0
Jun 30, 2018
06/18
by
Yun-Fei Yang; Hui-Xue Qu; Kai-Fan Ji; Song Feng; Hui Deng; Jia-Ben Lin; Feng Wang
texts
eye 3
favorite 0
comment 0
We study the motions of G band bright points (GBPs) in the quiet Sun to obtain the characteristics of different motion types. A high resolution image sequence taken with the Hinode/Solar Optical Telescope (SOT) is used, and GBPs are automatically tracked by segmenting 3D evolutional structures in a space time cube. After putting the GBPs that do not move during their lifetimes aside, the non stationary GBPs are categorized into three types based on an index of motion type. Most GBPs that move...
Topics: Astrophysics, Solar and Stellar Astrophysics
Source: http://arxiv.org/abs/1407.7958
