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Technique for measuring and correcting the Taylor microscale
Dasso, S.; Matthaeus, W. H.; Smith, C. W. +3 more
We discuss and develop methods to estimate and refine measurements of the Taylor microscale from discrete data sets. To study how well a method works, we construct a time series of discrete data with a known power spectrum and Taylor scale, but with various truncations of the resolution that eliminate higher frequencies in a controlled fashion. We…
Effects of mass varying neutrinos on cosmological parameters as determined from the cosmic microwave background
Ghalsasi, Akshay; Nelson, Ann E.
In models with a light scalar field (the "acceleron") coupled to neutrinos, neutrino masses depend on neutrino density. The resulting coupled system of mass varying neutrinos (MaVaNs) and the acceleron can act as a negative pressure fluid and is a candidate for dark energy [R. Fardon et al. J. Cosmol. Astropart. Phys. 10 (2004) 005]. MaVaNs also a…
Quantum collapse as a source of the seeds of cosmic structure during the radiation era
Landau, Susana J.; León, Gabriel; Piccirilli, María Pía
The emergence of the seeds of cosmic structure, from a perfect isotropic and homogeneous Universe, has not been clearly explained by the standard version of inflationary models as the dynamics involved preserve the homogeneity and isotropy at all times. A proposal that attempts to deal with this problem, by introducing "the self-induced collapse h…
An Atlas of Far-ultraviolet Spectra of the Zeta Aurigae Binary 31 Cygni with Line Identifications
Bennett, Philip D.; Hagen Bauer, Wendy
The ζ Aurigae system 31 Cygni (K4 Ib + B4 V) was observed by the FUSE satellite during total eclipse and at three phases during chromospheric eclipse. We present the coadded, calibrated spectra and atlases with line identifications. During total eclipse, emission from high ionization states (e.g., Fe III and Cr III) shows asymmetric profiles redsh…
A close examination of cosmic microwave background mirror-parity after Planck
Kovetz, Ely D.; Ben-David, Assaf
Previous claims of significant evidence for mirror-parity in the large-scale cosmic microwave background (CMB) data from the Wilkinson Microwave Anisotropy Probe (WMAP) experiment have been recently echoed in the first study of isotropy and statistics of CMB data from Planck. We revisit these claims with a careful analysis of the latest data avail…
Lyman edges in supermassive black hole binaries.
Generozov, A.; Haiman, Z.
We propose a new spectral signature for supermassive black hole binaries (SMBHBs) with circumbinary gas discs: a sharp drop in flux bluewards of the Lyman limit. A prominent edge is produced if the gas dominating the emission in the Lyman continuum region of the spectrum is sufficiently cold (T ≲ 20 000 K) to contain significant neutral hydrogen. …
XMM-Newton observations of the low-luminosity cataclysmic variable V405 Pegasi
Granzer, T.; Pires, A. M.; Thorstensen, J. R. +4 more
Context. V405 Peg is a low-luminosity cataclysmic variable (CV) that was identified as the optical counterpart of the bright, high-latitude ROSAT all-sky survey source RBS1955. The system was suspected to belong to a largely undiscovered population of hibernating CVs. Despite intensive optical follow-up its subclass however remained undetermined. …
Tracing Recent Star Formation of Red Early-type Galaxies out to z ~ 1
Im, Myungshin; Lee, Jong Chul; Hwang, Ho Seong +3 more
We study the mid-infrared (IR) excess emission of early-type galaxies (ETGs) on the red sequence at z < 1 using a spectroscopic sample of galaxies in the fields of Great Observatories Origins Deep Survey (GOODS). In the mass-limited sample of 1025 galaxies with M star > 1010.5 M ⊙ and 0.4 < z < 1.05, we…
Monte Carlo radiation transfer in CV disk winds: application to the AM CVn prototype
Werner, K.; Feldmeier, A.; Kusterer, D. -J. +2 more
Context. AM CVn systems are ultracompact binaries in which a (semi-) degenerate star transfers helium-dominated matter onto a white dwarf. They are effective gravitational-wave emitters and potential progenitors of Type Ia supernovae.
Aims: To understand the evolution of AM CVn systems it is necessary to determine their mass-loss rate through…
Analysis of clumps in Saturn's F ring from Voyager and Cassini
Showalter, Mark R.; French, Robert S.; Hicks, Shannon K. +2 more
Saturn's F ring is subject to dynamic structural changes over short periods. Among the observed phenomena are diffuse extended bright clumps (ECs) ∼3-40° in longitudinal extent. These ECs appear, evolve, and disappear over a span of days to months. ECs have been seen by the two Voyager spacecraft, the Cassini Orbiter, and various ground- and space…