Search Publications
Solar irradiance observations with PREMOS filter radiometers on the PICARD mission: In-flight performance and data release
Egorova, T.; Schmutz, W.; Rozanov, E. +22 more
Context. The PREcision Monitoring Sensor (PREMOS) is a solar radiometer on board the French PICARD mission that was launched in June 2010 and decommissioned in April 2014.
Aims: The PREMOS radiometer obtains solar irradiance measurements in specific spectral windows in the UV, visible, and near-infrared. In this paper, the PREMOS data and cal…
Wave propagation in a solar quiet region and the influence of the magnetic canopy
Tziotziou, K.; Tsiropoula, G.; Kontogiannis, I.
Aims: We seek indications or evidence of transmission/conversion of magnetoacoustic waves at the magnetic canopy, as a result of its impact on the properties of the wave field of the photosphere and chromosphere.
Methods: We use cross-wavelet analysis to measure phase differences between intensity and Doppler signal oscillations in the H…
Formation of a solar Hα filament from orphan penumbrae
Solanki, S. K.; Lagg, A.; van Noort, M. +1 more
Aims: The formation and evolution of an Hα filament in active region (AR) 10953 is described.
Methods: Observations from the Solar Optical Telescope (SOT) aboard the Hinode satellite starting from UT 18:09 on 27th April 2007 until UT 06:08 on 1st May 2007 were analysed. 20 scans of the 6302 Å Fe I line pair recorded by SOT/SP were invert…
Searching for narrow absorption and emission lines in XMM-Newton spectra of gamma-ray bursts
D'Avanzo, P.; Campana, S.; Tagliaferri, G. +7 more
We present the results of a spectroscopic search for narrow emission and absorption features in the X-ray spectra of long gamma-ray burst (GRB) afterglows. Using XMM-Newton data, both EPIC and RGS spectra, of six bright (fluence > 10-7 erg cm-2) and relatively nearby (z = 0.54-1.41) GRBs, we performed a blind search for em…
XMM-Newton study of the Draco dwarf spheroidal galaxy
Sasaki, Manami; Saeedi, Sara; Ducci, Lorenzo
Aims: We present the results of the analysis of five XMM-Newton observations of the Draco dwarf spheroidal galaxy (dSph). The aim of the work is the study of the X-ray population in the field of the Draco dSph.
Methods: We classified the sources on the basis of spectral analysis, hardness ratios, X-ray-to-optical flux ratio, X-ray variab…
X-ray deficiency on strongly accreting T Tauri stars. Comparing Orion with Taurus
Bouy, H.; Manara, C. F.; Merín, B. +3 more
Context. Depending on whether a T Tauri star accretes material from its circumstellar disk or not, different X-ray emission properties can be found. The accretion shocks produce cool heating of the plasma, contributing to the soft X-ray emission from the star.
Aims: Using X-ray data from the Chandra Orion Ultra-deep Project and accretion rate…
Two giant outbursts of V0332+53 observed with INTEGRAL
Kretschmar, Peter; Pottschmidt, Katja; Wilms, Jörn +7 more
Context. In July 2015, the high-mass X-ray binary V0332+53 underwent a giant outburst, a decade after the previous one. V0332+53 hosts a strongly magnetized neutron star. During the 2004-2005 outburst, an anti-correlation between the centroid energy of its fundamental cyclotron resonance scattering features (CRSFs) and the X-ray luminosity was obs…
Total infrared luminosity estimation from local galaxies in AKARI all sky survey
Takeuchi, T. T.; Pollo, A.; Solarz, A.
We aim to use the a new and improved version of AKARI all sky survey catalogue of far-infrared sources to recalibrate the formula to derive the total infrared luminosity. We cross-match the faint source catalogue (FSC) of IRAS with the new AKARI-FIS and obtained a sample of 2430 objects. Then we calculate the total infrared (TIR) luminosity L…
The faint end of the 250 µm luminosity function at z < 0.5
Wang, L.; Cooray, A.; Farrah, D. +12 more
Aims: We aim to study the 250 µm luminosity function (LF) down to much fainter luminosities than achieved by previous efforts.
Methods: We developed a modified stacking method to reconstruct the 250 µm LF using optically selected galaxies from the SDSS survey and Herschel maps of the GAMA equatorial fields and Stripe 82. Our …
Optical spectroscopy of the microquasar GRS 1758-258: a possible intermediate mass system?
Luque-Escamilla, Pedro L.; Martí, Josep; Muñoz-Arjonilla, Álvaro J.
Context. GRS 1758-258 is one of two prototypical microquasars towards the Galactic center direction discovered almost a quarter of a century ago. The system remains poorly studied in the optical domain due to its counterpart being a very faint and absorbed target in a crowded region of the sky.
Aims: Our aim is to investigate GRS 1758-258 in …