Search Publications
An Angle-dependent Synchrotron Self-Compton Model for Relativistic Jet Sources
Böttcher, M.; Jamil, O.
We report on the development of a numerical code to calculate the angle-dependent synchrotron + synchrotron self-Compton radiation from relativistic jet sources with partially ordered magnetic fields and anisotropic particle distributions. Using a multi-zone radiation transfer approach, we can simulate magnetic-field configurations ranging from pe…
Antlia Dwarf Galaxy: distance, quantitative morphology and recent formation history via statistical field correction
Pimbblet, Kevin A.; Couch, Warrick J.
We apply a statistical field correction technique originally designed to determine membership of high redshift galaxy clusters to Hubble Space Telescope (HST) imaging of the Antlia Dwarf Galaxy; a galaxy at the very edge of the Local Group. Using the tip of the red giant branch standard candle method coupled with a simple Sobel edge detection filt…
AMUSE-Virgo. III. Mid-infrared Photometry of Early-type Galaxies and Limits on Obscured Nuclear Emission
Treu, Tommaso; Antonucci, Robert; Gallo, Elena +3 more
We complete our census of low-level nuclear activity in Virgo Cluster early-type galaxies by searching for obscured emission using Spitzer Space Telescope mid-infrared (MIR) imaging at 24 µm. Of a total sample of 95 early-type galaxies, 53 objects are detected, including 16 showing kiloparsec-scale dust in optical images. One-dimensional and…
Chandra, Swift, and HST studies of the CXOM31 J004253.1+411422. Very bright X-ray transient in M 31
Moss, A.; Murray, S. S.; Garcia, M. R. +3 more
Context. A very bright transient X-ray source, CXOM 31 J004253.1+411422, was found by Chandra/HRC in the M 31 bulge. We present Chandra, Swift, and Hubble Space Telescope (HST) observations of this source.
Aims: Since this source is the brightest known X-ray transient in M 31, we want to study its nature with Chandra and Swift. Comparing the …
Investigation of CTA 1 using a Suzaku observation
Enoto, Teruaki; Kong, Albert K. H.; Hui, C. Y. +7 more
We report on a 105-ks Suzaku observation (obsid 404011010 with J. Takata as PI) of the supernova remnant CTA 1 (G119.5+10.2). The Suzaku soft X-ray observation was carried out using both the timing and imaging modes. A ∼10-arcmin extended feature, which is interpreted as a bow-shock component of the pulsar wind nebula, is revealed in this deep obs…
Fractal properties of active regions
Golovko, A. A.; Salakhutdinova, I. I.
The dynamics of active regions have been investigated using multi-fractal analysis methods, based on magnetograms of the full solar disk in the 630.2 nm line obtained with the SOLIS vector spectromagnetograph of Kitt Peak Observatory (USA) during 2006-2007 and January 1, 2009-April 12, 2010. The applied method of multi-fractal segmentation reveals…
Slow-Scan Observations with the Infrared Camera (IRC) aboard AKARI
Oyabu, Shinki; Yamamura, Issei; Takita, Satoshi +6 more
We present the characterization and calibration of the slow-scan observation mode of the Infrared Camera (IRC) aboard AKARI. The IRC Slow-scan observations were operated at the S9W (9µm) and L18W (18µm) bands. We developed a toolkit for data reduction of the IRC Slow-scan observations. We introduced a "self-pointing reconstruction" met…
Very fast photometric and X-ray observations of the intermediate polar V2069 Cygni (RX J2123.7+4217)
Haberl, F.; Kanbach, G.; Słowikowska, A. +1 more
We present fast timing photometric observations of the intermediate polar V2069 Cygni (RX J2123.7+4217) using the Optical Timing Analyzer (OPTIMA) at the 1.3-m telescope of Skinakas Observatory. The optical (450-950 nm) light curve of V2069 Cygni was measured with sub-second resolution for the first time during 2009 July and revealed a double-peak…
Consequences of negative ions for Titan's plasma interaction
Brecht, Stephen H.; Ledvina, Stephen A.
A hybrid particle code has been used to examine how Titan's interaction with Saturn's magnetosphere is affected by the presence of negative ions in Titan's ionosphere. The simulations self-consistently include a version of Titan's ionosphere represented by 8 generic positive ion species, over 40 ion-neutral chemical reactions, ion-neutral collisio…
A Second Neutron Star in M4?
Thompson, Ian B.; Kaluzny, J.; Rozanska, A. +2 more
We show that the optical counterpart of the X-ray source CX 1 in M4 is a ~20th magnitude star, located in the color-magnitude diagram on (or very close to) the main sequence of the cluster, and exhibiting sinusoidal variations of the flux. We find the X-ray flux to be also periodically variable, with X-ray and optical minima coinciding. Stability …