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COSAC Onboard Rosetta: A Bioastronomy Experiment for the Short-Period Comet 67P/Churyumov-Gerasimenko
Roll, Reinhard; Rosenbauer, Helmut; Gösmann, Fred +1 more
The COSAC (Cometary Sampling and Composition Experiment) onboard the Rosetta mission is a combined gas chromatograph (GC)-mass spectrometer (MS). It is situated on Philae, the lander of the mission, which is intended to land on the nucleus of comet 67/PChuryumov- Gerasimenko. The purpose of the experiment is to analyze the volatile fraction of soi…
SX Phoenicis Stars in the Globular Cluster M 13
Kopacki, G.
We present results of the search for SX Phe stars in the globular cluster M 13. In photometric reductions we used the image subtraction method supplemented with procedure of searching for short-period variable stars, based on the examination of each pixel in the CCD frames. We illustrate also the ability of this approach to find variability with s…
The XMM-Newton View of the Relativistic Spectral Features in AX J0447-0627
Ballo, L.; Braito, V.; Della Ceca, R. +1 more
The XMM-Newton observation of the optically type 1 active galactic nucleus (AGN) AX J0447-0627 (z=0.214) unambiguously reveals a complex, bright, and prominent set of lines in the 4-8 keV rest-frame energy range. Although from a phenomenological point of view, the observed properties can be described by a simple power-law model plus five narrow Ga…
Morphological studies of the Spitzer Wide-Area Infrared Extragalactic survey galaxy population in the UGC 10214 Hubble Space Telescope/Advanced Camera for Surveys field
Pérez-Fournon, I.; Rodighiero, G.; Hatziminaoglou, E. +16 more
We present the results of a morphological analysis of a small subset of the Spitzer Wide-Area Infrared Extragalactic survey (SWIRE) galaxy population. The analysis is based on public Advanced Camera for Surveys (ACS) data taken inside the SWIRE N1 field, which are the deepest optical high-resolution imaging available within the SWIRE fields as of …
Constraining the thermal history of the warm-hot intergalactic medium
Finoguenov, A.; Maiolino, R.; Gilli, R. +3 more
We have identified a large-scale structure traced by galaxies at z=0.8, within the Lockman Hole, by means of multi-object spectroscopic observations. By using deep XMM images we have investigated the soft X-ray emission from the Warm-Hot Intergalactic Medium (WHIM) expected to be associated with this large-scale structure and we set a tight upper …
New Observations of the Pulsar Wind Nebula in the Supernova Remnant CTB 80
Moiseev, A. V.; Blinnikov, S. I.; Lozinskaya, T. A. +1 more
We investigated the kinematics of the pulsar wind nebula (PWN) in the old supernova remnant CTB 80 using the Fabry-Perot interferometer of the 6-m Special Astrophysical Observatory telescope. In addition to the previously known expansion of the system of bright filaments with a velocity of 100 200 km s-1, we detected weak high-velocity features in…
Cluster observations and theoretical identification of broadband waves in the auroral region
André, M.; Stenberg, G.; Rème, H. +7 more
Broadband waves are common on auroral field lines. We use two different methods to study the polarization of the waves at 10 to 180 Hz observed by the Cluster spacecraft at altitudes of about 4 Earth radii in the nightside auroral region. Observations of electric and magnetic wave fields, together with electron and ion data, are used as input to t…
Solar cycle evolution of the contrast of small photospheric magnetic elements
Ortiz, Ada
Solar irradiance variations produced on the solar rotation time-scale are known to be driven by the passage of active regions while, during the last years, the origin of variations on the solar cycle time-scale has been under debate. Nowadays, there is an agreement that the magnetic network has an important contribution to these long-term variatio…
Metallicity of mono- and multiperiodic β Cephei stars
Niemczura, E.; Daszyńska-Daszkiewicz, J.
Analyzing IUE ultraviolet spectra of β Cep pulsating stars we noticed that multiperiodic variables have a larger mean metal abundance in the photosphere, [ m/H] , than monoperiodic ones. We apply statistical tests to verify this dichotomy. We obtain that, with a large probability, the multiperiodic β Cep stars have greater values of [ m/H] . This …
A solar active region loop compared with a 2D MHD model
Gontikakis, C.; Tsinganos, K.; Petrie, G. J. D. +1 more
We analyzed a coronal loop observed with the Normal Incidence Spectrometer (NIS), which is part of the Coronal Diagnostic Spectrometer (CDS) on board the Solar and Heliospheric Observatory (SOHO). The measured Doppler shifts and proper motions along the selected loop strongly indicate unidirectional flows. Analysing the Emission Measure Curves of …