Results 51 to 60 of about 445,900 (142)

Non-LTE Spectral Analysis of Extremely Hot Post-AGB Stars: Constraints for Evolutionary Theory [PDF]

Proceedings of the International Astronomical Union, 2008
Spectral analysis by means of Non-LTE model-atmosphere techniques has arrived at a high level of sophistication: fully line-blanketed model atmospheres which consider opacities of all elements from H to Ni allow the reliable determination of photospheric
T. Rauch, K. Werner, M. Ziegler, L. Koesterke, J. W. I. F. Astronomy, Astrophysics, K. C. F. Astro, P. Physics, E. University, 1. Sand, Tubingen, H Germany, Texas Advanced Computer Center, U. Texas, Austin, Usa, D. Physics, Astronomy, J. University, Baltimore.   +19 more
semanticscholar   +1 more source

Missing Thermal Energy of the Intracluster Medium

, 2007
The Sunyaev-Zel'dovich (SZ) effect is a direct probe of thermal energy content of the Universe, induced in the cosmic microwave background (CMB) sky through scattering of CMB photons off hot electrons in the intracluster medium (ICM). We report a 9-sigma
Afshordi, Niayesh, Lin, Yen-Ting, Nagai, Daisuke, Sanderson, Alastair J. R.   +3 more
core   +2 more sources

FUSE spectroscopy of the sdOB primary of the post common-envelope binary LB 3459 ( AA Doradus ) [PDF]

, 2008
Context. LB 3459 (AA Doradus) is an eclipsing, close, post common-envelope binary (PCEB) consisting of an sdOB primary star and an unseen secondary with an extraordinarily low mass (M2 ≈ 0.066 M ) – formally a brown dwarf.
Johannes Fleig, T. Rauch, K. Werner, J. W. I. F. Astronomy, Astrophysics, K. C. F. Astro, P. Physics, E. University, Tuebingen, H Germany, D. Physics, Astronomy, J. University, Baltimore., Md, U.S.A.   +15 more
semanticscholar   +1 more source

The Reionization of the Universe by the First Stars and Quasars [PDF]

, 2000
The first light from stars and quasars ended the ``dark ages'' of the universe and led to the reionization of hydrogen by redshift 7. Current observations are at the threshold of probing this epoch. The study of high-redshift sources is likely to attract
Abraham Loeb, Aghanim N, Boisé P, Eddington AS, Frank J, Haiman Z, Jeans JH, Kolb EW, Madau P, Miyaji T, Osterbrock DE, Paczyński B, Peebles PJE, Reimers D, Rennan Barkana, Richstone D, Scalo J, Scott D, Shaver PA, Silk J, Sunyaev RA, Theureau G, Valageas P, Zel'dovich YB   +23 more
core   +2 more sources

Dark matter density profiles: A comparison of nonextensive theory with N-body simulations [PDF]

, 2006
Density profiles of simulated galaxy cluster-sized dark matter haloes are analysed in the context of a recently introduced nonextensive theory of dark matter and gas density distributions.
T. Kronberger, M. Leubner, E. V. K. I. F. Astro-, Particlephysics, Innsbruck, Austria, Institute for Computational Astrophysics, Goettingen, H Germany   +8 more
semanticscholar   +1 more source

The virtual observatory service TheoSSA: Establishing a database of synthetic stellar flux standards - I. NLTE spectral analysis of the DA-type white dwarf G191−B2B [PDF]

, 2013
Hydrogen-rich, DA-type white dwarfs are particularly suited as primary standard stars for flux calibration. State-of-the-art NLTE models consider opacities of species up to trans-iron elements and provide reliable synthetic stellar-atmosphere spectra to ...
T. Rauch, R. Bohlin, J. Kruk, K. W. I. F. Astronomy, Astrophysics, K. C. F. Astro, P. Physics, E. University, Tuebingen, Germany, Space Telescope Science Institute, Baltimore, Md, Usa, Nasa Goddard Space Flight Center, Greenbelt   +15 more
semanticscholar   +1 more source

Dynamic Screening and Thermonuclear Reaction Rates [PDF]

Astrophys.J. 496 (1998) 503, 1997
We show that there are no dynamic screening corrections to the Salpeter's enhancement factor in the weak-screening limit.
arxiv   +1 more source

The Strange Prospects for Astrophysics

, 2009
The implications of the formation of strange quark matter in neutron stars and in core-collapse supernovae is discussed with special emphasis on the possibility of having a strong first order QCD phase transition at high baryon densities.
A Mezzacappa, F-K Thielemann, Faulkner A J, Freire P C C, G Pagliara, Glendenning N K, Haensel P, I Sagert, Ishizuka C, J Schaffner-Bielich, Kämpfer B, M Hempel, M Liebendörfer, Marek A Janka H T, Pearson K J, Schaffner-Bielich J, T Fischer, Weisberg J M   +17 more
core   +1 more source

Close-up of primary and secondary asteroseismic CoRoT targets and the ground-based follow-up observations [PDF]

, 2007
To optimise the science results of the asteroseismic part of the CoRoT satellite mission a complementary simultaneous ground-based observational campaign is organised for selected CoRoT targets. The observations include both high-resolution spectroscopic
K. Uytterhoeven, E. Poretti, M. Rainer, L. Mantegazza, W. Zima, C. Aerts, T. Morel, A. Miglio, K. Lefever, P. Amado, S. Martín-Ruiz, P. Mathias, J. Valtier, M. Paparó, J. Benkő, the CoRoTSWG INAF-Brera, Instituut voor Sterrenkunde, Kuleuven, D. O. Astrophysics, U. Nijmegen, I. d'Astrophysique, ULg, I. D. A. D. Andalucia, Observatoire Gemini, K. Observatory   +24 more
semanticscholar   +1 more source

Minimal Dark Matter predictions for galactic positrons, anti-protons, photons

, 2008
We present the energy spectra of the fluxes of positrons, anti-protons and photons generated by Dark Matter annihilations in our galaxy, as univocally predicted by the model of Minimal Dark Matter.
Aguilar, Aguilar, Aguilar, Alessandro Strumia, Alwall, Asaoka, Bahcall, Baltz, Barger, Barrau, Barwick, Berezinsky, Bergstrom, Bergstrom, Boezio, Boezio, Boezio, Bottino, Bringmann, Bringmann, Brun, Brun, Chang, Chardonnet, Cirelli, Cirelli, Cirelli, Delahaye, Diemand, Donato, Donato, Ellis, Finkbeiner, Ginzburg, Gleeson, Gleeson, Grimani, Gunn, Hisano, Hisano, Hisano, Hisano, Hisano, Hisano, Hooper, Kamionkowski, Lavalle, Lavalle, Mack, Maeno, Maltoni, Marco Cirelli, Maurin, Maurin, Moskalenko, Navarro, Orito, Picozza, Roberto Franceschini, Silk, Sjöstrand, Spergel, Stecker, Stelzer, Tan, Tegmark, Webber, Zeldovich   +67 more
core   +2 more sources