Search Publications
Evolution in the Dust Lane Fraction of Edge-on L* V Spiral Galaxies Since z = 0.8
Dalcanton, J. J.; Koekemoer, A.; Böker, T. +5 more
The presence of a well-defined and narrow dust lane in an edge-on spiral galaxy is the observational signature of a thin and dense molecular disk, in which gravitational collapse has overcome turbulence. Using a sample of galaxies out to z ~ 1 extracted from the COSMOS survey, we identify the fraction of massive (L* V ) disks that displ…
Unusual Stokes V profiles during flaring activity of a delta sunspot
Fletcher, L.; Snik, F.; Fischer, C. E. +2 more
Aims: We analyze a set of full Stokes profile observations of the flaring active region NOAA 10808. The region was recorded with the Vector-Spectromagnetograph of the Synoptic Optical Long-term Investigations of the Sun facility. The active region produced several successive X-class flares between 19:00 UT and 24:00 UT on September 13, 2005 a…
The relation between surface star formation rate density and spiral arms in NGC 5236 (M 83)
Larsen, S. S.; Silva-Villa, E.
Context. For a long time the consensus has been that star formation rates are higher in the interior of spiral arms in galaxies, compared to inter-arm regions. However, recent studies have found that the star formation inside the arms is not more efficient than elsewhere in the galaxy. Previous studies have based their conclusion mainly on integra…
A Catalog of Galactic Infrared Carbon Stars
Chen, P. S.; Yang, X. H.
We collected almost all of the Galactic infrared carbon stars (IRCSs) from literature published up to the present to organize a catalog of 974 Galactic IRCSs in this paper. Some of their photometric properties in the near-, mid-, and far-infrared are discussed.
Kinematics and Flare Properties of Radio-Loud CMEs
Prakash, O.; Shanmugaraju, A.; Umapathy, S. +1 more
A detailed analysis of the characteristics of coronal mass ejections (CMEs) and flares associated with decameter-hectometer wavelength type-II radio bursts (hereafter DH-type-II radio bursts, DH-CMEs or radio-loud CMEs) observed in the period 1997 - 2008 is presented. A sample of 61 limb events is divided into two populations based on the residual…
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,…