Search Publications
Point spread functions for the Solar optical telescope onboard Hinode
Wedemeyer-Böhm, S.
Aims: We investigate the combined point spread function (PSF) of the Broadband Filter Imager (BFI) and the Solar Optical Telescope (SOT) onboard the Hinode spacecraft.
Methods: Observations of the Mercury transit from November 2006 and the solar eclipse(s) from 2007 are used to determine the PSFs of SOT for the blue, green, and red continuum c…
The impact of Spitzer infrared data on stellar mass estimates - and a revised galaxy stellar mass function at 0 < z < 5
Elsner, F.; Hopp, U.; Feulner, G.
Aims:We estimate stellar masses of galaxies in the high redshift universe with the intention of determining the influence of newly available Spitzer/IRAC infrared data on the analysis. Based on the results, we probe the mass assembly history of the universe.
Methods: We use the GOODS-MUSIC catalog, which provides multiband photometry from the …
Detection of sea-serpent field lines in sunspot penumbrae
Bellot Rubio, L. R.; Sainz Dalda, A.
Aims:We investigate the spatial distribution of magnetic polarities in the penumbra of a spot observed very close to disk center.
Methods: High angular and temporal resolution magnetograms taken with the Narrowband Filter Imager aboard Hinode are used in this study. They provide continuous and stable measurements in the photospheric Fe I 630.2…
Properties of the Galactic population of cataclysmic variables in hard X-rays
Sunyaev, R.; Krivonos, R.; Revnivtsev, M. +2 more
We measure the spatial distribution and hard X-ray luminosity function of cataclysmic variables (CVs) using the INTEGRAL all-sky survey in the 17-60 keV energy band. The vast majority of CVs detected by INTEGRAL are intermediate polars of luminosity in the range 1032-1034 erg s-1. The scale height of the Galactic d…
Intermediate long X-ray bursts from the ultra-compact binary candidate SLX 1737-282
Kuulkers, E.; Falanga, M.; Chenevez, J. +3 more
Aims: The low persistent flux X-ray burster source SLX 1737-282 is classified as an ultra-compact binary candidate. We compare the data on SLX 1737-282 with the other similar objects and attempt to derive constraints on the physical processes responsible for the formation of intermediate long bursts.
Methods: Up to now only four bursts, all wi…
The evolution of planetary nebulae. V. The diffuse X-ray emission
Steffen, M.; Schönberner, D.; Warmuth, A.
Context: Observations with space-borne X-ray telescopes revealed the existence of soft, diffuse X-ray emission from the inner regions of planetary nebulae. Although the existing images support the idea that this emission arises from the hot shocked central-star wind which fills the inner cavity of a planetary nebula, existing models have difficult…
Low-mass X-ray binaries in the bulge of the Milky Way
Sunyaev, R.; Revnivtsev, M.; Sazonov, S. +4 more
We study the population of low-mass X-ray binaries (LMXBs) in the Galactic bulge using the deep survey of this region by the IBIS telescope aboard the INTEGRAL observatory. Thanks to the increased sensitivity with respect to previous surveys of this field, we succeeded in probing the luminosity function (LF) of LMXBs down to ~7×1034 erg…
Quantitative spectroscopy of Deneb
Przybilla, N.; Schiller, F.
Context: Quantitative spectroscopy of luminous BA-type supergiants offers a high potential for modern astrophysics. Detailed studies allow the evolution of massive stars, galactochemical evolution, and the cosmic distance scale to be constrained observationally.
Aims: A detailed and comprehensive understanding of the atmospheres of BA-type sup…
Magnetic field emergence in quiet Sun granules
Bellot Rubio, L. R.; Tsuneta, S.; del Toro Iniesta, J. C. +1 more
Aims:We describe a new form of small-scale magnetic flux emergence in the quiet Sun. This process seems to take vertical magnetic fields from subsurface layers to the photosphere, where they appear above granular convection cells.
Methods: High-cadence time series of spectropolarimetric measurements obtained by Hinode in a quiet region near di…
IMAGES IV: strong evolution of the oxygen abundance in gaseous phases of intermediate mass galaxies from z ~ 0.8
Cesarsky, C.; Östlin, G.; Yang, Y. +22 more
Context: Intermediate mass galaxies (> 1010 M_⊙) at z ~ 0.6 are the likeliest progenitors of the present-day, numerous population of spirals. There is growing evidence that they have evolved rapidly in the last 6 to 8 Gyr, and likely already have formed a significant fraction of their stellar mass, often showing perturbed morphologie…