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First detection and characterization of symbiotic stars in M31
Caldwell, Nelson; Mikołajewska, Joanna; Shara, Michael M.
Symbiotic binaries are putative progenitors of Type Ia supernovae. The census of Galactic symbiotic binaries is so incomplete that we cannot reliably estimate the total population of these stars, and use it to check whether that number is consistent with the observed Type Ia supernova rate in spiral galaxies. We have thus begun a survey of the nea…
Herschel observations of Hickson compact groups of galaxies: Unveiling the properties of cold dust
Le Floc'h, E.; Appleton, P. N.; da Cunha, E. +5 more
We present a Herschel far-infrared and sub-millimetre (sub-mm) study of a sample of 120 galaxies in 28 Hickson compact groups (HCGs). Fitting their UV to sub-mm spectral energy distributions with the model of da Cunha et al. (2008), we accurately estimate the dust masses, luminosities, and temperatures of the individual galaxies. We find that near…
A comparative study of radio halo occurrence in SZ and X-ray selected galaxy cluster samples
Basu, Kaustuv; Sommer, Martin W.
We aim at an unbiased census of the radio halo population in galaxy clusters and test whether current low number counts of radio haloes have arisen from selection biases. We construct near-complete samples based on X-ray and Sunyaev-Zel'dovich (SZ) effect cluster catalogues and search for diffuse, extended (Mpc-scale) emission near the cluster cen…
SMA Observations on Faint Submillimeter Galaxies with S 850 < 2 mJy: Ultra Dusty Low-luminosity Galaxies at High Redshift
Chen, Chian-Chou; Williams, Jonathan P.; Wang, Wei-Hao +2 more
We obtained Submillimeter Array (SMA) observations of eight faint (intrinsic 850 µm fluxes < 2 mJy) submillimeter galaxies (SMGs) discovered in SCUBA images of the massive lensing cluster fields A370, A2390, and A1689 and detected five. In total, we obtain five SMA detections, all of which have de-lensed fluxes <1 mJy with estimated to…
Modified gravity with massive neutrinos as a testable alternative cosmological model
Baugh, Carlton M.; Barreira, Alexandre; Li, Baojiu +1 more
We show that, in the presence of massive neutrinos, the Galileon gravity model provides a very good fit to the current cosmic microwave background (CMB) temperature, CMB lensing and baryonic acoustic oscillation data. This model, which we dub νGalileon, when assuming its stable attractor background solution, contains the same set of free parameter…
Evidence for a Constant Initial Mass Function in Early-type Galaxies Based on Their X-Ray Binary Populations
Kundu, Arunav; Zepf, Stephen E.; Maccarone, Thomas J. +4 more
A number of recent studies have proposed that the stellar initial mass function (IMF) of early type galaxies varies systematically as a function of galaxy mass, with higher mass galaxies having bottom-heavy IMFs. These bottom-heavy IMFs have more low-mass stars relative to the number of high mass stars, and therefore naturally result in proportion…
The Scientific Use of the UKRVO Joint Digital Archive: GRBs Fields, Pluto, and Satellites of Outer Planets
Yizhakevych, O.; Andruk, V.; Pakuliak, L. +6 more
In the framework of UkrVO national project the new methods of plate digital image processing are developed. The photographic material of the UkrVO Joint Digital Archive (JDA - http://gua.db.ukr-vo.org/vo-mao/DB/archivespecial.php) is used for the solution of classic astrometric problem - positional and photometric determinations of objects registe…
Magnetosheath filamentary structures formed by ion acceleration at the quasi-parallel bow shock
Omidi, N.; Sibeck, D.; Gutynska, O. +1 more
Results from 2.5-D electromagnetic hybrid simulations show the formation of field-aligned, filamentary plasma structures in the magnetosheath. They begin at the quasi-parallel bow shock and extend far into the magnetosheath. These structures exhibit anticorrelated, spatial oscillations in plasma density and ion temperature. Closer to the bow shock…
XMM-Newton observations of 1A 0535+262 in quiescence
Tsygankov, S.; Santangelo, A.; Doroshenko, V. +3 more
Accretion onto magnetized neutron stars is expected to be centrifugally inhibited at low accretion rates. Several sources, however, are known to pulsate in quiescence at luminosities below the theoretical limit predicted for the onset of the centrifugal barrier. The source
GRB 120711A: an intense INTEGRAL burst with long-lasting soft γ-ray emission and a powerful optical flash
Covino, S.; Fugazza, D.; Greiner, J. +20 more
A long and intense γ-ray burst (GRB) was detected by INTEGRAL on 11 July 2012 with a duration of ~115 s and fluence of 2.8 × 10-4 erg cm-2 in the 20 keV-8 MeV energy range. GRB 120711A was at z ~ 1.405 and produced soft γ-ray emission (>20 keV) for at least ~10 ks after the trigger. The GRB was observed by several ground-b…