Search Publications
The CoRoT target HD 175726: an active star with weak solar-like oscillations
Auvergne, M.; Baudin, F.; García, R. A. +17 more
Context: The CoRoT short runs give us the opportunity to observe a large variety of late-type stars through their solar-like oscillations. We report observations of the star HD 175726 that lasted for 27 days during the first short run of the mission. The time series reveals a high-activity signal and the power spectrum presents an excess due to so…
A search for diffuse radio emission in the relaxed, cool-core galaxy clusters A1068, A1413, A1650, A1835, A2029, and Ophiuchus
Markevitch, M.; Govoni, F.; Carretti, E. +4 more
Aims: We analyze sensitive, high-dynamic-range, observations to search for extended, diffuse, radio emission in relaxed and cool-core galaxy clusters.
Methods: We performed deep 1.4 GHz Very Large Array observations, of A1068, A1413, A1650, A1835, A2029, and complemented our dataset with archival observations of Ophiuchus.
Results: We find…
On the continuum intensity distribution of the solar photosphere
Rouppe van der Voort, L.; Wedemeyer-Böhm, S.
Context: For many years, there seemed to be significant differences between the continuum intensity distributions derived from observations and simulations of the solar photosphere.
Aims: In order to settle the discussion on these apparent discrepancies, we present a detailed comparison between simulations and seeing-free observations that tak…
Generation of highly energetic electrons at reconnection outflow shocks during solar flares
Mann, G.; Aurass, H.; Warmuth, A.
Context: During solar flares a large amount of energy is suddenly released and partly transferred into energetic electrons. They are of special interest since a substantial part of the energy released during a flare is deposited into the energetic electrons. RHESSI observations, e.g. of the 2003 October 28 solar event, show that 1036 el…
Automated supervised classification of variable stars in the CoRoT programme. Method and application to the first four exoplanet fields
Auvergne, M.; Deleuil, M.; Jorda, L. +27 more
Context:
Aims: In this work, we describe the pipeline for the fast supervised classification of light curves observed by the CoRoT exoplanet CCDs. We present the classification results obtained for the first four measured fields, which represent a one-year in-orbit operation.
Methods: The basis of the adopted supervised classification meth…
Evidence of photospheric vortex flows at supergranular junctions observed by FG/SOT (Hinode)
Innes, D. E.; Potts, H. E.; Attie, R.
Context: Twisting motions of different sorts are observed in several layers of the solar atmosphere. Chromospheric sunspot whorls and rotation of sunspots or even higher up in the lower corona sigmoids are examples of the large-scale twisted topology of many solar features. Nevertheless, their occurrence on a large scale in the quiet photosphere h…
The galaxy major merger fraction to {z} 1
Pérez-González, P. G.; López-Sanjuan, C.; Gallego, J. +4 more
Aims: The importance of disc-disc major mergers in galaxy evolution remains uncertain. We study the major merger fraction in a SPITZER/IRAC-selected catalogue in the GOODS-S field up to z 1 for luminosity- and mass-limited samples.
Methods: We select disc-disc merger remnants on the basis of morphological asymmetries/distortions, and address t…
The solar chromosphere at high resolution with IBIS. II. Acoustic shocks in the quiet internetwork and the role of magnetic fields
Vecchio, A.; Cauzzi, G.; Reardon, K. P.
Context: The exact nature of the quiet solar chromosphere and especially its temporal variation, are still subjects of intense debate. One of the contentious issues is the possible role of the magnetic field in structuring the quieter solar regions.
Aims: We characterize the dynamics of the quiet inter-network chromosphere by studying the occu…
X-ray evidence for a mildly relativistic and variable outflow in the luminous Seyfert 1 galaxy Mrk 509
Maraschi, L.; Bianchi, S.; Cappi, M. +9 more
Context: There is growing evidence for the presence of blueshifted Fe K absorption lines in a number of radio-quiet AGNs and QSOs. These may be fundamental to probe flow dynamics near supermassive black holes.
Aims: Here we aim to verify and better characterise the existence of such Fe K absorption at ~8-10 keV in the luminous Seyfert 1 galaxy…
The zCOSMOS survey: the role of the environment in the evolution of the luminosity function of different galaxy types
Kneib, J. -P.; Maccagni, D.; Aussel, H. +64 more
Aims. An unbiased and detailed characterization of the galaxy luminosity function (LF) is a basic requirement in many astrophysical issues: it is of particular interest in assessing the role of the environment in the evolution of the LF of different galaxy types.
Methods: We studied the evolution in the B band LF to redshift z∼ 1 in the zCOSM…