Search Publications

Examining the Radio-loud/Radio-quiet Dichotomy with New Chandra and VLA Observations of 13 UGC Galaxies

Capetti, A.; Grandi, P.; Chiaberge, M. +7 more

We present the results from new ~15 ks Chandra-ACIS and 4.9 GHz Very Large Array (VLA) observations of 13 galaxies hosting low-luminosity active galactic nuclei (AGNs). This completes the multiwavelength study of a sample of 51 nearby early-type galaxies described in Capetti & Balmaverde and Balmaverde & Capetti. The aim of the three previ…

Vorticity of Subsurface Flows of Emerging and Decaying Active Regions

Howe, R.; Komm, R.; Hill, F.

We study the temporal variation of the vorticity of subsurface flows of 828 active regions and 977 quiet regions. The vorticity of these flows is derived from measured subsurface velocities. The horizontal flows are determined by analyzing high-resolution Global Oscillation Network Group Doppler data with ring-diagram analysis covering a range of …

Quantification of middle and lower cloud variability and mesoscale dynamics from Venus Express/VIRTIS observations at 1.74 µm

Baines, Kevin H.; Grinspoon, David H.; Momary, Thomas W. +1 more

We present an analysis of VIRTIS-M-IR observations of 1.74 µm emission from the nightside of Venus. The 1.74 µm window in the near infrared spectrum of Venus is an ideal proxy for investigating the evolution of middle and lower cloud deck opacity of Venus because it exhibits good signal to noise due to its brightness, good contrast bet…

On the origin of the jet-like radio/X-ray morphology of G290.1-0.8

Bocchino, F.; Combi, J. A.; García, F. +3 more

Context. The origin and evolution of supernova remnants of the mixed-morphology class is not well understood. Several remnants present distorted radio or X-ray shells with jet-like structures. G290.1-0.8 (MSH 11-61A) belongs to this particular class.
Aims: We aim to investigate the nature of this supernova remnant in order …

Herschel-ATLAS/GAMA: spatial clustering of low-redshift submm galaxies

Rodighiero, G.; Valtchanov, I.; Ivison, R. J. +44 more

We have measured the clustering properties of low-redshift (z < 0.3) submm galaxies detected at 250 µm in the Herschel-ATLAS science demonstration phase field. We selected a sample for which we have high-quality spectroscopic redshifts, obtained from reliably matching the 250-µm sources to a complete (for r < 19.4) sample of gala…

Magnetic Connectivity Between Active Regions 10987, 10988, and 10989 by Means of Nonlinear Force-Free Field Extrapolation

Inhester, B.; Wiegelmann, T.; Tadesse, Tilaye +1 more

Extrapolation codes for modelling the magnetic field in the corona in Cartesian geometry do not take the curvature of the Sun's surface into account and can only be applied to relatively small areas, e.g., a single active region. We apply a method for nonlinear force-free coronal magnetic field modelling of photospheric vector magnetograms in sphe…

Cloud structure of Saturn's 2010 storm from ground-based visual imaging

Sánchez-Lavega, A.; Pérez-Hoyos, S.; Colas, F. +5 more

We present a study of the vertical cloud structure for the initial stage of the Great White Spot (GWS), a giant storm that developed in Saturn in December 2010, using ground-based visual images. We focus in the characterization of the undisturbed atmosphere preceding the storm and the disturbed region in the wake of the GWS. The observations were …

Properties of OH, SIO, and H2O Maser Emission in O-Rich AGB Stars

Suh, Kyung-Won; Kwon, Young-Joo

A new shape from shading technique with application to Mars Express HRSC images

Barnes, D.; O'Hara, R.

We have developed a new optimisation based shape from shading algorithm which is able to make use of sophisticated camera and reflectance models and does not require a good initialising surface. Surface shape consistent with ground truth is obtained when the technique is applied to both synthetic rendered surfaces and real images captured by the M…

Transiting exoplanets from the CoRoT space mission. XXII. CoRoT-16b: a hot Jupiter with a hint of eccentricity around a faint solar-like star

Mazeh, T.; Guterman, P.; Aigrain, S. +53 more

Aims: We report the discovery of CoRoT-16b, a low density hot jupiter that orbits a faint G5V star (mV = 15.63) in 5.3523 ± 0.0002 days with slight eccentricity. A fit of the data with no a priori assumptions on the orbit leads to an eccentricity of 0.33 ± 0.1. We discuss this value and also derive the mass and radius of the planet.
Meth…