Search Publications
The unusual phase curve of Titan's surface observed by Huygens’ Descent Imager/Spectral Radiometer
Keller, H. U.; Schröder, S. E.
The Descent Imager/Spectral Radiometer onboard Huygens observed Titan's surface through the atmospheric methane windows [Tomasko, M.G., Doose, L., Engel, S., Dafoe, L.E., West, R., Lemmon, M., Karkoschka, E., See, C., 2008. A model of Titan's aerosols based on measurements made inside the atmosphere. Planet. Space Sci. 56, 669-707]. Infrared spect…
An extreme EXO: a type 2 QSO at z = 1.87
Akiyama, M.; Carrera, F. J.; Watson, M. G. +6 more
Aims: We aim to understand the multi-wavelength properties of 2XMM J123204+215255, the source with the most extreme X-ray-to-optical flux ratio amongst a sample of bright X-ray selected EXOs drawn from a cross-correlation of the 2XMMp catalogue with the SDSS-DR5 catalogue.
Methods: We use 2XMMp X-ray data, SDSS-DR5, NOT and UKIRT optical/NIR p…
Studying Large- and Small-Scale Environments of Ultraviolet Luminous Galaxies
Koekemoer, Anton M.; Madore, Barry F.; Ilbert, Olivier +24 more
Studying the environments of 0.4 < z < 1.2 ultraviolet (UV)-selected galaxies, as examples of extreme star-forming galaxies (with star formation rates (SFRs) in the range of 3-30 M sun yr-1), we explore the relationship between high rates of star formation, host halo mass, and pair fractions. We study the large- and sma…
A FEROS spectroscopic study of the extreme O supergiant He 3-759
Crowther, P. A.; Evans, C. J.
We present a study of the extreme O-type supergiant He 3-759 using new high-resolution FEROS data, revealing that it is a near spectroscopic twin of HD 151804 (O8 Iaf). We investigate the extinction towards He 3-759 using a variety of methods, revealing AV ∼ 4.7^m. If we assume He 3-759 has an identical absolute K-band magnitude to HD 1…
Drift-Alfvén waves in space plasmas - theory and mode identification
Krasnoselskikh, V. V.; Pokhotelov, O. A.; Onishchenko, O. G. +1 more
The theory of drift-Alfvén waves with the spatial scales comparable to the ion Larmor radius is developed. The dispersion relation, the wave impedance and variations of the plasma density perturbations versus the wave frequency are investigated. The relevance of theoretical results obtained to the Cluster observations in the cusp and near a reconn…
Comment on ``Evolution of Kelvin-Helmholtz activity on the dusk flank magnetopause'' by Foullon et al.
Hasegawa, Hiroshi
Abstract Available from http://www.agu.org
Radial Evolution of Well-Observed Slow CMEs in the Distance Range 2 - 30 R ⊙
Moon, Y. -J.; Shanmugaraju, A.; Vrsnak, Bojan +1 more
We performed a detailed analysis of 27 slow coronal mass ejections (CMEs) whose heights were measured in at least 30 coronagraphic images and were characterized by a high quality index (≥4). Our primary aim was to study the radial evolution of these CMEs and their properties in the range 2 - 30 solar radii. The instantaneous speeds of CMEs were ca…
History of gamma-ray telescopes and astronomy
Pinkau, Klaus
Gamma-ray astronomy is devoted to study nuclear and elementary particle astrophysics and astronomical objects under extreme conditions of gravitational and electromagnetic forces, and temperature. Because signals from gamma rays below 1 TeV cannot be recorded on ground, observations from space are required. The photoelectric effect is dominant <…
Neutral absorber dips in the periodic burster LMXB XB 1323-619 from Suzaku
Church, M. J.; Dotani, T.; Bałucińska-Church, M. +1 more
We present results of an observation with Suzaku of the dipping, periodic bursting low mass X-ray binary XB 1323-619. Using the energy band 0.8-70 keV, we show that the source spectrum is well-described as the emission of an extended accretion disk corona, plus a small contribution of blackbody emission from the neutron star. The dip spectrum is w…
Ages of M33 Star Clusters Based on the Hubble Space Telescope/WFPC2 Photometry
Lee, Myung Gyoon; Park, Hong Soo; Park, Won-Kee
We present a result of age estimation for star clusters in M33. We obtain color-magnitude diagrams (CMDs) of resolved stars in 242 star clusters from the Hubble Space Telescope/Wide Field Planetary Camera 2 images. We estimate ages of 100 star clusters among these, by fitting the Padova theoretical isochrones to the observational CMDs. Age distrib…