Search Publications
Galactic Wind in the Nearby Starburst Galaxy NGC 253 Observed with the Kyoto3DII Fabry-Perot Mode
Sugai, H.; Ishigaki, T.; Hattori, T. +5 more
We have observed the central region of the nearby starburst galaxy NGC 253 with the Kyoto Tridimensional Spectrograph II Fabry-Perot mode in order to investigate the properties of its galactic wind. Since this galaxy has a large inclination, it is easy to observe its galactic wind. We produced the Hα, [N II]λ6583, and [S II]λλ6716,6731 images, as …
Transient Magnetic and Doppler Features Related to the White-Light Flares in NOAA 10486
Maurya, R. A.; Ambastha, A.
Rapidly moving transient features have been detected in magnetic and Doppler images of super-active region NOAA 10486 during the X17/4B flare of 28 October 2003 and the X10/2B flare of 29 October 2003. Both these flares were extremely energetic white-light events. The transient features appeared during impulsive phases of the flares and moved with…
Parameters of the components of visually close binary systems: Hip 11352
Al-Wardat, M. A.
Model atmospheres of the components of the visually close binary system Hip 11352 were constructed using a grid of Kurucz's blanketed models. The entire observational spectral energy distribution of the system was used as a reference for the comparison with synthetic ones created from the model atmospheres. The parameters of the components of the …
XMM-Newton and INTEGRAL analysis of the Ophiuchus cluster of galaxies
Eckert, D.; Kaastra, J.; Bonamente, M. +2 more
Aims. We investigated the non-thermal hard X-ray emission in the Ophiuchus cluster of galaxies. Our aim is to characterise the physical properties of the non-thermal component and its interaction with the cosmic microwave background.
Methods: We performed spatially resolved spectroscopy and imaging using XMM-Newton data to model the thermal em…
3-D reconstructions of the early-November 2004 CDAW geomagnetic storms: analysis of Ooty IPS speed and density data
Jackson, B. V.; Buffington, A.; Hick, P. P. +4 more
Interplanetary scintillation (IPS) remote-sensing observations provide a view of the solar wind covering a wide range of heliographic latitudes and heliocentric distances from the Sun between ~0.1 AU and 3.0 AU. Such observations are used to study the development of solar coronal transients and the solar wind while propagating out through interpla…
Probing re-ionization with quasar spectra: the impact of the intrinsic Lyman α emission line shape uncertainty
Haiman, Z.; Kramer, R. H.
Arguably the best hope of understanding the tail end of the re-ionization of the intergalactic medium (IGM) at redshift z > 6 is through the detection and characterization of the Gunn-Peterson damping wing absorption of the IGM in bright quasar spectra. However, the use of quasar spectra to measure the IGM damping wing requires a model of the q…
Time - Distance Solar Far-Side Imaging Using Three-Skip Acoustic Signals
Zhao, J.; Hartlep, T.; Ilonidis, S.
The purpose of this work is to image solar far-side active regions using acoustic signals with three skips and improve the quality of existing images. The mapping of far-side active regions was first made possible using the helioseismic holography technique by use of four-skip acoustic signals. The quality of far-side images was later improved wit…
Probing The Solar Surface: The Oblateness and Astrophysical Consequences
Damiani, C.; Rozelot, J. P.; Pireaux, S.
Based on historical records, the Sun's dimensions are temporally dependent. Until the recent past, varying dimensions were keenly disputed. Recent accurate observations have removed the doubt, whether from direct limb observations or from helioseismology f-modes analysis. A shrinking or an expanding shape is ultimately linked to solar activity, as…
Massive Protoplanetary Disks in Orion Beyond the Trapezium Cluster
Williams, Jonathan P.; Mann, Rita K.
We present Submillimeter Array1The Submillimeter Array is a joint project between the Submillimeter Astrophysical Observatory and the Academica Sinica Institute of Astronomy and Astrophysics and is funded by the Smithsonian Institution and the Academica Sinica. observations of the 880 µm continuum emission from three circumstellar…
Optically Thick Outflows of Supercritical Accretion Discs: Radiative Diffusion Approach
Karpov, Sergey; Abolmasov, Pavel; Kotani, Taro
Highly supercritical accretion discs are probable sources of dense optically thick axisymmetric winds. We introduce a new approach based on diffusion approximation radiative transfer in a funnel geometry, and obtain an analytical solution for the energy density distribution inside the wind, assuming that all of the mass, momentum and energy are in…