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Separating drivers of Saturnian magnetopause motion
Dougherty, M. K.; Masters, A.; Sulaiman, A. H. +2 more
Surface waves on Saturn's magnetopause and oscillations of the magnetopause at a period associated with that of planetary rotation have previously been detected. How the amplitudes of these two key perturbations to the magnetopause position compare, however, is unclear. We construct a one-dimensional magnetopause model that considers both types of…
A Deep Chandra Observation of the Giant H II Region N11. I. X-Ray Sources in the Field
Nazé, Yaël; Chu, You-Hua; Wang, Q. Daniel +2 more
A very sensitive X-ray investigation of the giant H II region N11 in the Large Megallanic Cloud was performed using the Chandra X-ray Observatory. The 300 ks observation reveals X-ray sources with luminosities down to 1032 erg s-1, increasing the number of known point sources in the field by more than a factor of five. Among …
X-ray filament with a strong 6.7-keV line in the Galactic center region
Koyama, Katsuji; Nobukawa, Masayoshi; Nakashima, Shinya +3 more
An elongated X-ray source with a strong K-shell line from He-like iron (Fe XXVI) is found at (RA, Dec)J2000.0 = (17h44m00{s.}0, - 29°13'40{^''.}9) in the Galactic center region. The position coincides with the X-ray thread, G359.55+0.16, which is aligned with the radio non-thermal f…
Discovery of the spectroscopic binary nature of the classical Cepheids FN Aql and V1344 Aql
Szabados, L.; Cseh, B.; Kovács, J. +8 more
We present the analysis of photometric and spectroscopic data of two classical Cepheids, FN Aquilae and V1344 Aquilae. Based on the joint treatment of the new and earlier radial velocity data, both Galactic Cepheids have been found to be a member in a spectroscopic binary system. To match the phases of the earlier radial velocity data correctly wi…
The contribution of CHONS particles to the diffuse high-Galactic-latitude IR emission
Papoular, R.
This work purports to model the far-infrared grey-body emission in the spectra of high-Galactic-latitude clouds. Several carbonaceous laboratory materials are tested for their fitness as carriers of this modified blackbody emission which, according to data delivered by the Planck satellite, and others before, is best fitted with temperature 17.9 K…
Feasibility of transit photometry of nearby debris discs
Kalas, P.; Kenworthy, M. A.; Zeegers, S. T.
Dust in debris discs is constantly replenished by collisions between larger objects. In this paper, we investigate a method to detect these collisions. We generate models based on recent results on the Fomalhaut debris disc, where we simulate a background star transiting behind the disc, due to the proper motion of Fomalhaut. By simulating the exp…
Age-dating the Tully-Fisher relation at moderate redshift
Ferreras, Ignacio; Silk, Joseph; Ziegler, Bodo +1 more
We analyse the Tully-Fisher relation at moderate redshift from the point of view of the underlying stellar populations, by comparing optical and NIR photometry with a phenomenological model that combines population synthesis with a simple prescription for chemical enrichment. The sample comprises 108 late-type galaxies extracted from the FORS Deep…
Iris: An extensible application for building and analyzing spectral energy distributions
Pevunova, O.; Thomas, B.; D'Abrusco, R. +11 more
Iris is an extensible application that provides astronomers with a user-friendly interface capable of ingesting broad-band data from many different sources in order to build, explore, and model spectral energy distributions (SEDs). Iris takes advantage of the standards defined by the International Virtual Observatory Alliance, but hides the techni…
The origin of organic emission in NGC 2071
Johnstone, D.; Fich, M.; McCoey, C. +2 more
Context. The physical origin behind organic emission lines in embedded low-mass star formation has been fiercely debated over the last two decades. A multitude of scenarios have been proposed, from a hot corino to PDRs on cavity walls to shock excitation.
Aims: The aim of this paper is to determine the location and the corresponding physical …
Constraining primordial vector mode from B-mode polarization
Saga, Shohei; Shiraishi, Maresuke; Ichiki, Kiyotomo
The B-mode polarization spectrum of the Cosmic Microwave Background (CMB) may be the smoking gun of not only the primordial tensor mode but also of the primordial vector mode. If there exist nonzero vector-mode metric perturbations in the early Universe, they are known to be supported by anisotropic stress fluctuations of free-streaming particles …