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Non-thermal "Burst-on-Tail" of Long-Duration Solar Event on 26 October 2003
Struminsky, A.; Zimovets, I.
Observations of a rare long-duration solar event of GOES class X1.2 from 26 October 2003 are presented. This event showed a pronounced burst of hard X-ray and microwave emission, which was extremely delayed (> 60 min) with respect to the main impulsive phase and did not have any significant response visible in soft X-ray emission. We refer to t…
Extranuclear Hα-emitting complexes in low-z (U)LIRGs: precursors of tidal dwarf galaxies?
Colina, L.; Arribas, S.; Miralles-Caballero, D.
This paper characterizes the physical and kinematic properties of external massive star-forming regions in a sample of (U)LIRGs. We use high angular resolution ACS images from the Hubble Space Telescope (HST) in F435W (~B) and F814W (~I) bands, as well as Hα -line emission maps obtained with integral field spectroscopy. We find 31 external Hα -emi…
The radio spectra of reddened Two Micron All Sky Survey quasi-stellar objects: evidence for young radio jets
Georgakakis, A.; Hopkins, A. M.; Afonso, J. +1 more
Multifrequency radio continuum observations (1.4-22 GHz) of a sample of reddened quasi-stellar objects (QSOs) are presented. We find a high incidence (13/16) of radio spectral properties, such as low-frequency turnovers, high-frequency spectral breaks or steep power-law slopes, similar to those observed in powerful compact steep spectrum (CSS) and…
Correlations Between CME Parameters and Sunspot Activity
Du, Zhanle
Smoothed monthly mean coronal mass ejection (CME) parameters (speed, acceleration, central position angle, angular width, mass, and kinetic energy) for Cycle 23 are cross-analyzed, showing that there is a high correlation between most of them. The CME acceleration (a) is highly correlated with the reciprocal of its mass (M), with a correlation coe…
Magnetic field amplification in electron phase-space holes and related effects
Baumjohann, W.; Treumann, R. A.
Three-dimensional electron phase-space holes are shown to have positive charges on the plasma background, which produce a radial electric field and force the trapped electron component into an azimuthal drift. In this way electron holes generate magnetic fields in the hole. We solve the cylindrical hole model exactly for the hole charge, electric …
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…