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X-Ray Variability and the Inner Region in Active Galactic Nuclei
Mangalam, A.; Mohan, P.
We present theoretical models of X-ray variability attributable to orbital signatures from an accretion disk including emission region size, quasi-periodic oscillations (QPOs), and its quality factor Q, and the emergence of a break frequency in the power spectral density shape. We find a fractional variability amplitude of Fvar\propto M…
Fueling the central engine of radio galaxies. III. Molecular gas and star formation efficiency of 3C 293
Combes, F.; García-Burillo, S.; Neri, R. +6 more
Context. Powerful radio galaxies show evidence of ongoing active galactic nuclei (AGN) feedback, mainly in the form of fast, massive outflows. But it is not clear how these outflows affect the star formation of their hosts.
Aims: We investigate the different manifestations of AGN feedback in the evolved, powerful radio source
Influence of dust loading on atmospheric ionizing radiation on Mars
Gronoff, Guillaume; Mertens, Christopher J.; Norman, Ryan B.
Measuring the radiation environment at the surface of Mars is the primary goal of the Radiation Assessment Detector on the NASA Mars Science Laboratory's Curiosity rover. One of the conditions that Curiosity will likely encounter is a dust storm. The objective of this paper is to compute the cosmic ray ionization in different conditions, including…
Transiting exoplanets from the CoRoT space mission. XXVI. CoRoT-24: a transiting multiplanet system
Mazeh, T.; Aigrain, S.; Alonso, R. +48 more
We present the discovery of a candidate multiply transiting system, the first one found in the CoRoT mission. Two transit-like features with periods of 5.11 and 11.76 d are detected in the CoRoT light curve around a main sequence K1V star of r = 15.1. If the features are due to transiting planets around the same star, these would correspond to obj…
Caught in the act: cluster `k+a' galaxies as a link between spirals and S0s
Rodríguez Del Pino, Bruno; Aragón-Salamanca, Alfonso; Balcells, Marc +3 more
We use integral field spectroscopy of 13 disc galaxies in the cluster AC114 at z ∼ 0.31 in an attempt to disentangle the physical processes responsible for the transformation of spiral galaxies in clusters. Our sample is selected to display a dominant young stellar population, as indicated by strong Hδ absorption lines in their integrated spectra.…
Multiwavelength study of the high-latitude cloud L1642: chain of star formation
Juvela, M.; McGehee, P.; Ristorcelli, I. +16 more
Context. L1642 is one of the two high galactic latitude (|b| > 30°) clouds confirmed to have active star formation.
Aims: We examine the properties of this cloud, especially the large-scale structure, dust properties, and compact sources at different stages of star formation.
Methods: We present high-resolution far-infrared and submil…
Herschel spectral mapping of the Helix nebula (NGC 7293). Extended CO photodissociation and OH+ emission
Barlow, M. J.; Pearson, C.; Cernicharo, J. +13 more
Context. The Helix nebula (NGC 7293) is our closest planetary nebulae. Therefore, it is an ideal template for photochemical studies at small spatial scales in planetary nebulae.
Aims: We aim to study the spatial distribution of the atomic and the molecular gas, and the structure of the photodissociation region along the western rims of the He…
The HST/ACS Coma Cluster Survey - VII. Structure and assembly of massive galaxies in the centre of the Coma cluster
Mobasher, Bahram; Kormendy, John; Balcells, Marc +16 more
We constrain the assembly history of galaxies in the projected central 0.5 Mpc of the Coma cluster by performing structural decomposition on 69 massive (M⋆ ≥ 109 M⊙) galaxies using high-resolution F814W images from the Hubble Space Telescope (HST) Treasury Survey of Coma. Each galaxy is modelled with up to three Sé…
Potential multi-component structure of the debris disk around HIP 17439 revealed by Herschel/DUNES
Krivov, A. V.; Eiroa, C.; Löhne, T. +16 more
Context. The dust observed in debris disks is produced through collisions of larger bodies left over from the planet/planetesimal formation process. Spatially resolving these disks permits to constrain their architecture and thus that of the underlying planetary/planetesimal system.
Aims: Our Herschel open time key program DUNES aims at detec…
Mars Express observations of high altitude planetary ion beams and their relation to the "energetic plume" loss channel
Liemohn, Michael W.; Johnson, Blake C.; Fränz, Markus +1 more
This study presents observational evidence of high-energy (ions >2 keV) beams of planetary ions above Mars' induced magnetospheric boundary (IMB) and relates them with the energetic plume loss channel calculated from numerical models. A systematic search of the Mars Express (MEX) ion data using an orbit filtering criteria is described, using ma…