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Outer and inner mass distributions of the irregular galaxies UGC 4284 and UGC 11861: constraining the baryonic content through stellar population synthesis studies
Rosado, M.; Gabbasov, R.; Repetto, P. +1 more
In this paper, we investigate the outer and inner mass distributions of the irregular galaxies UGC 4284 and UGC 11861, taking advantage of published H I and H α high-resolution rotation curves and constraining the stellar disc of both galaxies throughout stellar population synthesis studies. In addition, we take into account the gas content of bot…
Electron-scale nested quadrupole Hall field in Cluster observations of magnetic reconnection
Jain, N.; Sharma, A. S.
This paper presents the first evidence of a new and unique feature of spontaneous reconnection at multiple sites in electron current sheet, viz. a "nested quadrupole" structure of the Hall field at electron scales, in Cluster observations. The new nested quadrupole is a consequence of electron-scale processes in reconnection. Whistler response of …
Discovery of Five Candidate Analogs for η Carinae in Nearby Galaxies
Sonneborn, G.; Kochanek, C. S.; Stanek, K. Z. +2 more
The late-stage evolution of very massive stars such as η Carinae may be dominated by episodic mass ejections that may later lead to Type II superluminous supernova (SLSN-II; e.g., SN 2006gy). However, as long as η Car is one of a kind, it is nearly impossible to quantitatively evaluate these possibilities. Here, we announce the discovery of five o…
The CIB-lensing bispectrum: impact on primordial non-Gaussianity and detectability for the Planck mission
Curto, A.; Kunz, M.; Martínez-González, E. +1 more
We characterize the cosmic infrared background (CIB)-lensing bispectrum which is one of the contributions to the three-point functions of cosmic microwave background (CMB) maps in harmonic space. We show that the CIB-lensing bispectrum has a considerable strength and that it can be detected with high significance in the Planck high-frequency maps.…
Late-time spectroscopy of SN 2002hh: a continued visible light echo with no shock interaction yet
Smith, Nathan; Mauerhan, Jon C.; Andrews, J. E.
Supernova (SN) 2002hh was unusual among core-collapse SNe because it was highly reddened, and displayed a bright infrared (IR) excess due to radiatively heated dust in its circumstellar medium (CSM). Estimates for the mass of dust responsible for the IR echo suggested the presence of a massive shell within 0.26 pc of the star. For a velocity of 50…
Wide-Field Variability Survey of the Globular Cluster M 79 and a New Period-Luminosity Relation for SX Phe Stars
Kopacki, G.
We present the results of a search for variable stars in a 26×39 arcmin2 field around globular cluster M 79 (NGC 1904). The search was made by means of an extended version of image subtraction, which allows us to analyze in a uniform manner CCD frames obtained with different telescopes and cameras of different sizes and resolutions. The…
Cosmological constraints on galaxy cluster structure
Alcaniz, J. S.; Holanda, R. F. L.
Observations of galaxy clusters (GC's) are a powerful tool to probe the evolution of the Universe at z < 2 . However, the real shape and structure of these objects are not completely understood and the assumption of asphericity is often used in several cosmological tests. In this work, we propose methods to infer the elongation of the gas distr…
Mars atmospheric losses induced by the solar wind: Comparison of observations with models
Vaisberg, Oleg
With new results from Mars-Express on plasma environment of Mars and two new Mars satellites the study Martian atmospheric losses receives new attention. Paper summarizes experimental results concentrating on configuration of Martian magnetosphere and the measurements of planetary ion escape induced by the solar wind. Several plasma populations co…
Ultraviolet ISM Diagnostics for Star-forming Galaxies. I. Tracers of Metallicity and Extinction
Leitherer, Claus; Danforth, Charles W.; Zetterlund, Erika +1 more
We have observed a sample of 14 nearby (z∼ 0.03) star-forming blue compact galaxies (BCGs) in the rest-frame far-UV (∼1150-2200 Å) using the Cosmic Origins Spectrograph on the Hubble Space Telescope. We have also generated a grid of stellar population synthesis models using the Starburst99 evolutionary synthesis code, allowing us to compare observ…
Rotation of sunspots in active region NOAA 10930
Gopasyuk, O. S.
The rotation of sunspots of the active region NOAA 10930 has been investigated using a time series of vector magnetic field maps from the Solar Optical Telescope aboard Hinode. The vertical, radial and azimuthal axisymmetrical components of the magnetic field vector have been reconstructed from the magnetic field line-of-sight component for both s…