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Dense molecular cloud cores as a source of micrometer-sized grains in galaxies
Li, Zhi-Yun; Hirashita, Hiroyuki; Nozawa, Takaya +2 more
Coreshine in dense molecular cloud cores (dense cores) is interpreted as evidence for micrometer-sized grains (referred to as very large grains, VLGs). VLGs may have a significant influence on the total dust amount and the extinction curve. We estimate the total abundance of VLGs in the Galaxy, assuming that dense cores are the site of VLG formati…
3C 220.3: A Radio Galaxy Lensing a Submillimeter Galaxy
Wilkes, Belinda J.; Clements, David L.; Lagattuta, David J. +17 more
Herschel Space Observatory photometry and extensive multiwavelength follow-up have revealed that the powerful radio galaxy (PRG) 3C 220.3 at z = 0.685 acts as a gravitational lens for a background submillimeter galaxy (SMG) at z = 2.221. At an observed wavelength of 1 mm, the SMG is lensed into three distinct images. In the observed near infrared,…
Seismic analysis of HD 43587Aa, a solar-like oscillator in a multiple system
Auvergne, M.; Baudin, F.; Chaintreuil, S. +26 more
Context. The object HD 43587Aa is a G0V star observed during the 145-day LRa03 run of the COnvection, ROtation and planetary Transits space mission (CoRoT), for which complementary High Accuracy Radial velocity Planet Searcher (HARPS) spectra with S/N > 300 were also obtained. Its visual magnitude is 5.71, and its effective temperature is close…
V745 Cassiopean interacting young massive binary in a multiple-star system
Ibanoglu, C.; Çakırlı, Ö.; Sipahi, E.
We present spectroscopic observations of the massive early-type system V745 Cas, embedded in a multiple-star system. The brightest star of the system is the eclipsing binary V745 Cas with an orbital period of 1.41 d. The radial velocities of both components and light curves obtained by INTEGRAL and Hipparcos missions were analysed. The components …
X-ray diagnostics of chemical composition of the accretion disc and donor star in UCXBs - II. XMM-Newton observations
Gilfanov, Marat; Bildsten, Lars; Koliopanos, Filippos +1 more
We search for the Fe Kα line in spectra of ultra-compact X-ray binaries (UCXBs). For this purpose we have analysed XMM-Newton observations of five confirmed UCXBs. We find that the object 2S 0918-549 - whose optical spectrum bears tentative signatures of a C/O accretion disc - is devoid of any emission features in the 6-7 keV range, with an upper …
Understanding the Nature of the Blazar CGRaBS J0211+1051
Ganesh, S.; Foschini, L.; Chandra, Sunil +1 more
The source CGRaBS J0211+1051 (MG1 J021114+1051, z = 0.20) flared up on 2011 January 23 in high-energy γ-rays as reported by the Large Area Telescope (LAT) on board Fermi. This event was followed by increased activity at the UV, optical, and radio frequencies as detected by the observing facilities worldwide. The source also showed a high and varia…
Unusual Solar Radio Burst Observed at Decameter Wavelengths
Rucker, H. O.; Panchenko, M.; Konovalenko, A. A. +5 more
An unusual solar burst was observed simultaneously by two decameter radio telescopes UTR-2 (Kharkov, Ukraine) and URAN-2 (Poltava, Ukraine) on 3 June 2011 in the frequency range of 16 - 28 MHz. The observed radio burst had some unusual properties, which are not typical for the other types of solar radio bursts. Its frequency drift rate was positiv…
AKARI Observations of Brown Dwarfs. IV. Effect of Elemental Abundances on Near-infrared Spectra between 1.0 and 5.0 µm
Yamamura, I.; Sorahana, S.
The detection of the CO2 absorption band at 4.2 µm in brown dwarf spectra by AKARI has made it possible to discuss CO2 molecular abundance in brown dwarf atmospheres. In our previous studies, we found an excess in the 4.2 µm CO2 absorption band of three brown dwarf spectra, and suggested that these devi…
Intensity Enhancement of O VI Ultraviolet Emission Lines in Solar Spectra due to Opacity
Doyle, J. G.; Madjarska, M. S.; Mathioudakis, M. +5 more
Opacity is a property of many plasmas. It is normally expected that if an emission line in a plasma becomes optically thick, then its intensity ratio to that of another transition that remains optically thin should decrease. However, radiative transfer calculations undertaken both by ourselves and others predict that under certain conditions the i…
Spatial Nonlocality of the Small-scale Solar Dynamo
Lamb, D. A.; DeForest, C. E.; Howard, T. A.
We explore the nature of the small-scale solar dynamo by tracking magnetic features. We investigate two previously explored categories of the small-scale solar dynamo: shallow and deep. Recent modeling work on the shallow dynamo has produced a number of scenarios for how a strong network concentration can influence the formation and polarity of ne…