Search Publications
Study of the solar Slow Sonic, Alfvén and Fast Magnetosonic transition surfaces
Katsikas, Valadis; Exarhos, George; Moussas, Xenophon
In this paper we study the shape, extend and time variations of the solar wind transition surfaces using the Lima and Priest (1993) hydrodynamic model adequately adapted for the case of the solar wind flow. The transition surfaces, namely the Slow (Sonic), the Alfvén, and the Fast Magnetosonic surface, are important boundaries around the Sun and p…
The Opacity of Galactic Disks at z ~ 0.7
Kneib, J. -P.; Ilbert, O.; Taniguchi, Y. +13 more
We compare the surface brightness-inclination relation for a sample of COSMOS pure disk galaxies at z ~ 0.7 with an artificially redshifted sample of Sloan Digital Sky Survey (SDSS) disks well matched to the COSMOS sample in terms of rest-frame photometry and morphology, as well as their selection and analysis. The offset between the average surfa…
The Deep SPIRE HerMES Survey: spectral energy distributions and their astrophysical indications at high redshift
Altieri, B.; Aussel, H.; Elbaz, D. +70 more
The Spectral and Photometric Imaging Receiver on-board Herschel has been carrying out deep extragalactic surveys, one of the aims of which is to establish spectral energy distributions of individual galaxies spanning the infrared/submillimetre (IR/SMM) wavelength region. We report observations of the IR/SMM emission from the Lockman North field an…
On the relation between supersoft X-ray sources and VY Scl stars: The cases of V504 Cen and VY Scl
Greiner, J.; Sala, G.; Mennickent, R. E. +3 more
We summarise our optical monitoring program of VY Scl stars with the SMARTS telescopes, and triggered X-ray as well as optical observations after/during state transitions of V504 Cen and VY Scl.
Based partially on CNTAC programs 04B-0086, 05A-0004, 05B-0209, 06A-0099, 06B-0250, 07A-0384, 07B-0054, 08A-0026, 08B-0056, 09A-0025, as well as ESO …Ignition Column Depths of Helium-rich Thermonuclear Bursts from 4U 1728-34
Galloway, Duncan K.; Misanovic, Zdenka; Cooper, Randall L.
We analyzed thermonuclear (type I) X-ray bursts observed from the low-mass X-ray binary 4U 1728-34 by RXTE, Chandra, and INTEGRAL. We compared the variation in burst energy and recurrence times as a function of accretion rate with the predictions of a numerical ignition model including a treatment of the heating and cooling in the crust. We found …
X-ray energy spectra of CAL87
Rauch, T.; Ebisawa, K.; Takei, D.
On the mystery of the perennial carbon dioxide cap at the south pole of Mars
Soto, Alejandro; Richardson, Mark Ian; Guo, Xin +1 more
A perennial ice cap has long been observed near the south pole of Mars. The surface of this cap is predominantly composed of carbon dioxide ice. The retention of a CO2 ice cap results from the surface energy balance of the latent heat, solar radiation, surface emission, subsurface conduction, and atmospheric sensible heat. While models …
The importance of nucleus rotation in determining the largest grains ejected from comets
Molina, A.
The maximum diameter of large boulders ejected from the cometary nuclei is investigated using the classical model of dust grain as dragged out by radially expanding cometary gases. The importance of the inertial forces, and particularly those due to the rotation of the comet is shown. Although a larger dust grain can be lifted from the nucleus sur…
Disc and halo kinematic populations from HIPPARCOS and Geneva-Copenhagen surveys of the solar neighbourhood
Cubarsi, R.; Alcobé, S.; Vidojević, S. +1 more
Discontinuities in the local velocity distribution associated with stellar populations are studied using the Maximum Entropy of the Mixture Probability from HIerarchical Segregation (MEMPHIS) improved statistical method, by combining a sampling parameter, an optimisation of the mixture approach, and a maximisation of the partition entropy for the …
IGR J16547-1916/1RXS J165443.5-191620—a new intermediate polar from the INTEGRAL galactic survey
Lutovinov, A. A.; Revnivtsev, M. G.; Burenin, R. A. +2 more
We present the results of our optical identification of the X-ray source IGR J16547-1916 detected by the INTEGRAL observatory during a deep all-sky survey. Analysis of the spectroscopic data from the SWIFT and INTEGRAL observatories in the X-ray energy band and from the BTA (Special Astrophysical Observatory) telescope in the optical band has show…