Search Publications
PMAS optical integral field spectroscopy of luminous infrared galaxies. I. The atlas
Colina, L.; Monreal-Ibero, A.; Arribas, S. +4 more
Context: Luminous and ultraluminous infrared galaxies (LIRGs and ULIRGs) are key cosmological classes since they account for most of the co-moving star formation rate density at z ∼ 1-2. It is then important to have detailed studies of local samples of their counterparts for understanding the internal and dynamical processes taking place at high-z…
Temporal comparison of nonthermal flare emission and magnetic-flux change rates
Veronig, A. M.; Vršnak, B.; Miklenic, C. H.
Context: To understand the mechanisms that trigger solar flares, we require models describing and quantifying observable responses to the original energy release process, since the coronal energy release site itself cannot be resolved with current technical equipment. Testing the usefulness of a particular model requires the comparison of its pred…
The zCOSMOS redshift survey: the three-dimensional classification cube and bimodality in galaxy physical properties
Kneib, J. -P.; Maccagni, D.; Cimatti, A. +56 more
Aims: We investigate the relationships between three main optical galaxy observables (spectral properties, colors, and morphology), exploiting the data set provided by the COSMOS/zCOSMOS survey. The purpose of this paper is to define a simple galaxy classification cube, with a carefully selected sample of ≈1000 galaxies.
Methods: Using medium …
Stray light correction and contrast analysis of Hinode broad-band images
Solanki, S. K.; Zakharov, V.; Mathew, S. K.
The contrasts of features in the quiet Sun are studied using filtergrams recorded by the broad-band filter imager mounted on the Hinode/Solar Optical Telescope. In a first step, the scattered light originating in the instrument is modeled using Mercury transit data. Combinations of four two-dimensional Gaussians with different widths and weights w…
A systematic study of variability among OB-stars based on HIPPARCOS photometry
Lefèvre, L.; Moffat, A. F. J.; Marchenko, S. V. +1 more
Context: Variability is a key factor for understanding the nature of the most massive stars, the OB stars. Such stars lie closest to the unstable upper limit of star formation.
Aims: In terms of statistics, the data from the HIPPARCOS satellite are unique because of time coverage and uniformity. They are ideal to study variability in this larg…
Forbush decreases and turbulence levels at coronal mass ejection fronts
Antia, H. M.; Subramanian, P.; Kojima, H. +14 more
Aims: We seek to estimate the average level of MHD turbulence near coronal mass ejection (CME) fronts as they propagate from the Sun to the Earth.
Methods: We examined the cosmic ray data from the GRAPES-3 tracking muon telescope at Ooty, together with the data from other sources for three closely observed Forbush decrease events. Each of thes…
Propagating waves in polar coronal holes as seen by SUMER & EIS
Solanki, S. K.; Teriaca, L.; Gupta, G. R. +3 more
Context: To study the dynamics of coronal holes and the role of waves in the acceleration of the solar wind, spectral observations were performed over polar coronal hole regions with the SUMER spectrometer on SoHO and the EIS spectrometer on Hinode.
Aims: Using these observations, we aim to detect the presence of propagating waves in the coron…
Molecular gas in NUclei of GAlaxies (NUGA). XI. A complete gravity torque map of NGC 4579: new clues to bar evolution
Hunt, L. K.; Krips, M.; Schinnerer, E. +6 more
In this paper we create a complete gravity torque map of the disk of the LINER/Seyfert 1.9 galaxy NGC 4579. We quantify the efficiency of angular momentum transport and search for signatures of secular evolution in the fueling process from r ~ 15 kpc down to the inner r ~ 50 pc around the active galactic nucleus (AGN). We use both the 1-0 and 2-1 …
Updating the orbital ephemeris of Hercules X-1; rate of decay and eccentricity of the orbit
Klochkov, D.; Wilms, J.; Staubert, R.
We present an update of the orbital ephemeris of the binary X-ray pulsar Her X-1 and determine an improved value for the rate of orbital decay. In addition, we report the first measurement of the orbital eccentricity. We analyzed pulse timing data of Her X-1 from X-ray observations by RXTE (Rossi X-Ray Timing Explorer) and INTEGRAL over the period…
Noise properties of the CoRoT data. A planet-finding perspective
Mazeh, T.; Guterman, P.; Aigrain, S. +30 more
In this short paper, we study the photometric precision of stellar light curves obtained by the CoRoT satellite in its planet-finding channel, with a particular emphasis on the time scales characteristic of planetary transits. Together with other articles in the same issue of this journal, it forms an attempt to provide the building blocks for a s…