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INTEGRAL and Swift observations of the supergiant fast X-ray transient AX J1845.0-0433 = IGR J18450-0435
Hill, A. B.; Bird, A. J.; Ubertini, P. +8 more
Context: AX J1845.0-0433 was discovered by ASCA in 1993 during fast outburst activity characterized by several flares on short timescales. Up to now, the source was not detected again by any X-ray mission. Its optical counterpart is suggested to be an O9.5I supergiant star, which is the only remarkable object found inside the ASCA error box.
A…
Complex X-ray morphology of Abell 3128: a distant cluster behind a disturbed cluster
Finoguenov, A.; Böhringer, H.; Kaastra, J. S. +4 more
We present here the results of a detailed study of the X-ray properties of the cluster of galaxies Abell 3128 (z = 0.06), based on the analysis of deep (100 ks) XMM-Newton data. The most obvious feature of the X-ray morphology of A3128 is the presence of two X-ray peaks separated by ~12'. By detecting the redshifted Fe K line, we find that the Nor…
Search for photospheric footpoints of quiet Sun transition region loops
Sütterlin, P.; Teriaca, L.; Schühle, U. +3 more
Context: The footpoints of quiet Sun Transition Region (TR) loops do not seem to coincide with the photospheric magnetic structures appearing in traditional low-sensitivity magnetograms.
Aims: We look for the so-far unidentified photospheric footpoints of TR loops using G-band bright points (BPs) as proxies for photospheric magnetic field conc…
Morphological evolution of z ~ 1 galaxies from deep K-band AO imaging in the COSMOS deep field
Rouan, D.; Huertas-Company, M.; Tasca, L. +3 more
Context: We present the results of an imaging program of distant galaxies (z∼0.8) at high spatial resolution (~0.1'') aiming at studying their morphological evolution. We observed 7 fields of 1'×1' with the NACO Adaptive Optics system (VLT) in Ks (2.16~µm) band with typical V∼14 guide stars and 3 h integration time per field. Obse…
The superrotation of solar supergranules
Meunier, N.; Roudier, T.
Context: Supergranules have long been believed to rotate faster than plasma and than magnetic structures. However, it has recently been shown that this could be due to a bias appearing when using Dopplergrams, which are strongly affected by projection effets.
Aims: Our purpose is to perform new measurements of supergranule angular velocities u…
The host galaxy of GRB 011121: morphology and spectral energy distribution
Pian, E.; Greiner, J.; Salvato, M. +3 more
Aims:We present a detailed study of the host galaxy of GRB 011121 (at z = 0.36) based on high-resolution imaging in 5 broad-band, optical and near-infrared filters with HST and VLT/ISAAC.
Methods: The surface brightness profile of this galaxy is best fitted by a Sersic law with index n ∼ 2-2.5 and a rather large effective radius (~7.5 kpc). Bo…
Dust and molecular content of the lensed quasar, MG0751+2716, at z = 3.2
Kneib, J. -P.; Bremer, M.; Alloin, D. +1 more
Context: Gravitational lenses offer unique opportunities to explore the molecular content around active galactic nuclei at high redshift, through the magnification and gain in angular resolution.
Aims: We study here the molecular and dust content of the high redshift (z=3.2), gravitationally lensed quasar MG0751+2716.
Methods: We used the …
Prominence fine structures in a magnetic equilibrium. III. Lyman continuum in 2D configurations
Heinzel, P.; Anzer, U.; Gunár, S.
Aims:We discuss the behavior of the Lyman continuum profiles studied on the grid of 2D vertical-thread models for prominence fine structures.
Methods: Multilevel non-LTE transfer calculations for a 12-level plus continuum hydrogen model atom are used.
Results: Since the Lyman continuum is formed in regions with different temperatures for d…
Unravelling the morphologies of luminous compact galaxies using the HST/ACS GOODS survey
Flores, H.; Hammer, F.; Rawat, A. +2 more
Context: Luminous Compact Galaxies (LCGs) (MB ≤ -20, R1/2 ≤ 4.5 kpc and EW0(OII) ≥ 15 Å) constitute one of the most rapidly evolving galaxy populations over the last ~8 Gyr history of the universe. Due to their inherently compact sizes, any detailed quantitative analysis of their morphologies has proved to be diffi…
Log-normal intensity distribution of the quiet-Sun FUV continuum observed by SUMER
Curdt, W.; Fontenla, J. M.; Avrett, E. H. +1 more
We analyse observations of the quiet-Sun far ultraviolet (FUV) continuum at various wavelengths near 1430 Å obtained by the SUMER instrument on SOHO. According to semi-empirical atmospheric models this continuum originates from the layers in the chromosphere where the temperature rises from low values at near-radiative equilibrium to a plateau of …