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Dwarf galaxies in the Coma cluster - II. Spectroscopic and photometric fundamental planes
Mobasher, B.; Carter, D.; Khosroshahi, H. G. +1 more
We present a study of the Fundamental Plane (FP) for a sample of 71 dwarf galaxies in the core of the Coma cluster in the magnitude range -21 < MI < -15. Taking advantage of the high-resolution DEIMOS spectrograph on Keck II for measuring the internal velocity dispersion of galaxies and high-resolution imaging of the Hubble Space …
Matching the Spectral Energy Distribution and P-mode Oscillation Frequencies of the Rapidly Rotating Delta Scuti Star α Ophiuchi with a Two-dimensional Rotating Stellar Model
Deupree, Robert G.; Castañeda, Diego; Peña, Fernando +1 more
Spectral energy distributions are computed using two-dimensional (2D) rotating stellar models and non-LTE plane-parallel model atmospheres. A rotating, 2D stellar model has been found that matches the observed ultraviolet and visible spectrum of α Oph. The SED match occurs for the interferometrically deduced surface shape and inclination, and is d…
The Swift Burst Alert Telescope Perspective on Non-thermal Emission in HIFLUGCS Galaxy Clusters
Sarazin, Craig L.; Okajima, Takashi; Wik, Daniel R. +5 more
The search for diffuse non-thermal, inverse Compton (IC) emission from galaxy clusters at hard X-ray energies has been underway for many years, with most detections being either of low significance or controversial. In this work, we investigate 14-195 keV spectra from the Swift Burst Alert Telescope (BAT) all-sky survey for evidence of non-thermal…
Inner magnetosphere currents during the CIR/HSS storm on July 21-23, 2009
Runov, A.; Ganushkina, N. Y.; Dubyagin, S. +2 more
Modeling results of the configuration of the inner magnetosphere current systems, namely, the ring current and the near-Earth tail current, during the July 21-23, 2009 CIR/HSS storm event are presented. We use two different modeling approaches, magnetic field modeling and particle modeling. We perform the magnetospheric magnetic field modeling wit…
Production of N2 Vegard-Kaplan and other triplet band emissions in the dayglow of Titan
Bhardwaj, Anil; Jain, Sonal Kumar
Recently the Cassini Ultraviolet Imaging Spectrograph (UVIS) has revealed the presence of N2 Vegard-Kaplan (VK) band A3Σu+-X1Σg+ emissions in Titan's dayglow limb observation. We present model calculations for the production of various N2 triplet states (viz., A3Σu+,B3Πg,…
VIRTIS/VEX observations of Venus: overview of selected scientific results
Drossart, Pierre; Piccioni, Giuseppe; Haus, Rainer +2 more
After six years in a polar Venus orbit, the visible and infrared thermal imaging spectrometer (VIRTIS) on ESA's Venus Express mission provided an enormous amount of new data, including a three-dimensional view of the atmosphere and information on global surface properties of the planet. An overview is given of selected scientific results achieved …
Multi-wavelength GOALS Observations of Star Formation and Active Galactic Nucleus Activity in the Luminous Infrared Galaxy IC 883
Sanders, D. B.; Kim, D. -C.; Surace, J. A. +11 more
New optical Hubble Space Telescope (HST), Spitzer Space Telescope, Galaxy Evolution Explorer, and Chandra observations of the single-nucleus, luminous infrared galaxy (LIRG) merger IC 883 are presented. The galaxy is a member of the Great Observatories All-sky LIRG Survey and is of particular interest for a detailed examination of a luminous late-…
A Search for Infrared Emission from Core-collapse Supernovae at the Transitional Phase
Onaka, Takashi; Arimatsu, Ko; Matsuhara, Hideo +7 more
Most of the observational studies of supernova (SN) explosions are limited to early phases (<a few years after the explosion) of extragalactic SNe and observations of SN remnants (>100 yr) in our Galaxy or very nearby galaxies. SNe at the epoch between these two, which we call the "transitional" phase, have not been explored in detail except…
Disc scalelengths out to redshift 5.8
Hatziminaoglou, E.; Fathi, K.; Epinat, B. +1 more
We compute the exponential disc scalelength for 686 disc galaxies with spectroscopic redshifts out to redshift 5.8 based on Hubble Space Telescope archival data. We compare the results with our previous measurements based on 30 000 nearby galaxies from the Sloan Digital Sky Survey. Our results confirm the presence of a dominating exponential compo…
Discovery of a magnetic field in the early B-type star σ Lupi
Wade, G. A.; Kolenberg, K.; Grunhut, J. H. +6 more
Context. Magnetic early B-type stars are rare. Indirect indicators are needed to identify them before investing in time-intensive spectropolarimetric observations.
Aims: We use the strongest indirect indicator of a magnetic field in B stars, which is periodic variability of ultraviolet (UV) stellar wind lines occurring symmetric about the app…