3.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Slovak Academy of SciencesSK377 papers
- Centre National de la Recherche ScientifiqueFR328 papers
- University of GroningenNL256 papers
- Instituto de Astrofísica de CanariasES218 papers
- Leiden UniversityNL201 papers
- University of AmsterdamNL199 papers
- Université Paris CitéFR193 papers
- National Institute for AstrophysicsIT192 papers
- Czech Academy of Sciences, Astronomical InstituteCZ181 papers
- Sorbonne UniversitéFR178 papers
- Max Planck Institute for AstronomyDE177 papers
- Goddard Space Flight CenterUS172 papers
44 papers · 1 filter
Projective Ring Line Encompassing Two-Qubits
Metod Saniga, Michel Planat, Petr Pracna
The projective line over the (non-commutative) ring of two-by-two matrices with coefficients in GF(2) is found to fully accommodate the algebra of 15 operators - generalized Pauli…
Multiple Qubits as Symplectic Polar Spaces of Order Two
Metod Saniga, Michel Planat
It is surmised that the algebra of the Pauli operators on the Hilbert space of N-qubits is embodied in the geometry of the symplectic polar space of rank N and order two, W_{2N - 1…
Leo II Group: decoupled cores of NGC 3607 and NGC 3608
Victor L. Afanasiev, Olga K. Sil'chenko
The kinematics, structure, and stellar population properties in the centers of two brightest early-type galaxies of the Leo II group, NGC 3607 and NGC 3608, are studied by means of…
Possible Solutions to the Radius Anomalies of Transiting Giant Planets
A. Burrows, I. Hubeny, J. Budaj +1
We calculate the theoretical evolution of the radii of all fourteen of the known transiting extrasolar giant planets (EGPs) for a variety of assumptions concerning atmospheric opac…
Comments on the manuscript: ``The weak absorbing outflow in AGN Mrk 279: evidence of super-solar metal abundances'' astro-ph/0611578 by Fields et al
Nahum Arav, Jelle Kaastra, Elisa Costantini
A recent manuscript posted on astro-ph (astro-ph/0611578) by Fields et al. (hereafter F06) reports evidence of supersolar metal abundances in Mrk 279 by analyzing its Chandra LETGS…
Stellar abundances of early-type galaxies
S. C. Trager
It is currently impossible to determine the abundances of stellar populations star-by-star in dense stellar systems more distant than a few megaparsecs. Therefore, methods to analy…
Revealing the Nature of Algol Disks through Optical and UV Spectroscopy, Synthetic Spectra, and Tomography of TT Hydrae
Brendan Miller, Jan Budaj, Mercedes Richards +2
We have developed a systematic procedure to study the disks in Algol-type binaries using spectroscopic analysis, synthetic spectra, and tomography. We analyzed 119 H-alpha spectra…
First e-VLBI observations of GRS 1915+105
A. Rushton, R. E. Spencer, M. Strong +10
We present results from the first successful open call e-VLBI science run, observing the X-ray binary GRS 1915+105. e-VLBI science allows the rapid production of VLBI radio maps, w…
Radial Velocity Studies of Close Binary Stars. XII
Theodor Pribulla, Slavek M. Rucinski, George Conidis +4
Radial-velocity measurements and sine-curve fits to the orbital radial velocity variations are presented for ten close binary systems: OO Aql, CC Com, V345 Gem, XY Leo, AM Leo, V10…
Statistics of relativistically broadened Fe K-alpha lines in AGN
M. Guainazzi, S. Bianchi, M. Dovciak
We present preliminary results on the properties of relativistically broadened Fe K-alpha lines in a collection of more then 100 Active Galactic Nuclei (AGN) observed by the XMM-Ne…
Black holes and magnetic fields
J. Bicak, V. Karas, T. Ledvinka
Stationary axisymmetric magnetic fields are expelled from outer horizons of black holes as they become extremal. Extreme black holes exhibit Meissner effect also within exact Einst…
The Zoo of Neutron Stars
S. B. Popov
In these lecture notes I briefly discuss the present day situation and new discoveries in astrophysics of neutron stars focusing on isolated objects. The latter include soft gamma…
Astronomy meets QCD: cooling constraints for the theories of internal structure of compact objects
S. B. Popov, D. Blaschke, H. Grigorian +1
We discuss a set of tests which confront observations of cooling compact objects and theories of their thermal evolution. As an example we apply the recently developed $\mathrm{Log…
Detecting UHE Cosmics & Neutrinos off the Moon; an Optimal Radio Window
O. Scholten, J. Bacelar, R. Braun +4
We show that at wavelengths comparable to the length of the shower produced by an Ultra-High Energy cosmic ray or neutrino, radio signals are an extremely efficient way to detect t…
Short time scale pulse stability of the Crab pulsar in the optical band
S. Karpov, G. Beskin, A. Biryukov +4
The fine structure and the variations of the optical pulse shape and phase of the Crab pulsar are studied on various time scales. The observations have been carried out on 4-m Will…
Impact of neutron star oscillations on the accelerating electric field in the polar cap of pulsar: or could we see oscillations of the neutron star after the glitch in pulsar?
Andrey N. Timokhin
Pulsar "standard model", that considers a pulsar as a rotating magnetized conducting sphere surrounded by plasma, is generalized to the case of oscillating star. We developed an al…
Empirical Color Transformations Between SDSS Photometry and Other Photometric Systems
Katrin Jordi, Eva K. Grebel, Karin Ammon
We present empirical color transformations between the Sloan Digital Sky Survey (SDSS) ugriz photometry and Johnson-Cousins UBVRI system and Becker's RGU system, respectively. Owin…
New Galactic Wolf-Rayet stars, and candidates. An annex to The VIIth Catalogue of Galactic Wolf-Rayet Stars
Karel A. van der Hucht
This paper gathers, from the literature and private communication, 72 new Galactic Population I Wolf-Rayet stars and 17 candidate WCLd stars, recognized and/or discovered after the…
Rapid interstellar scintillation of PKS B1257-326: two-station pattern time delays and constraints on scattering and microarcsecond source structure
H. E. Bignall, J. -P. Macquart, D. L. Jauncey +3
We report measurements of time delays of up to 8 minutes in the centimeter wavelength variability patterns of the intra-hour scintillating quasar PKS 1257-326 as observed between t…
VLT/UVES spectroscopy of Wray 977, the hypergiant companion to the X-ray pulsar GX301-2
L. Kaper, A. van der Meer, F. Najarro
Model atmosphere fits to high-resolution optical spectra of Wray 977 confirm the B hypergiant classification of the massive companion to the X-ray pulsar GX301-2. The models give a…
Broad H-alpha wings from the optically thin stellar wind of the hot components in symbiotic binaries
A. Skopal
Aims: To model broad H-alpha wings observed in symbiotic binaries by an optically thin, bipolar stellar wind from their hot components as an alternative to that considering the Ram…
Ejection of Hyper-Velocity Stars from the Galactic Centre by Intermediate-Mass Black Holes
Holger Baumgardt, Alessia Gualandris, Simon Portegies Zwart
We have performed N-body simulations of the formation of hyper-velocity stars (HVS) in the centre of the Milky Way due to inspiralling intermediate-mass black holes (IMBHs). We con…
A Spitzer Study of Comets 2P/Encke, 67P/Churyumov-Gerasimenko, and C/2001 HT50 (LINEAR-NEAT)
Michael S. Kelley, Charles E. Woodward, David E. Harker +8
We present infrared images and spectra of comets 2P/Encke, 67P/Churyumov-Gerasimenko, and C/2001 HT50 (LINEAR-NEAT) as part of a larger program to observe comets inside of 5 AU fro…
Possibilities of analysis of brightness distributions for components of eclipsing variables from data of space photometry
M. B. Bogdanov, A. M. Cherepashchuk
We carried out numerical experiments on the evaluation of the possibilities of obtaining the information about brightness distributions for the components of eclipsing variables fr…