Showing 2004 · astro-phShow all

26 papers · 2 filters

astro-ph2004

Numerical Results on Low Mass Star and Brown Dwarf Multiplicity

Eduardo Delgado-Donate, Cathie Clarke

We have undertaken a series of hydrodynamic + N-body simulations in order to explore the properties of young stars. Our results suggest that the IMF may be sensitive to environment…

astro-ph2004★ 41 cited

Search for extraterrestrial point sources of high energy neutrinos with AMANDA-II using data collected in 2000-2002

The AMANDA Collaboration, M. Ackermann

The results of a search for point sources of high energy neutrinos in the northern hemisphere using data collected by AMANDA-II in the years 2000, 2001 and 2002 are presented. In p…

astro-ph2004★ 379 cited

The diversity of Type Ia Supernovae: evidence for systematics?

S. Benetti, E. Cappellaro, P. A. Mazzali +8

The photometric and spectroscopic properties of 26 well observed Type Ia Supernovae (SNeIa) were analyzed with the aim to explore SNIa diversity. The sample includes (Branch-)norma…

astro-ph2004★ 277 cited

The binary progenitor of Tycho Brahe's 1572 supernova

Pilar Ruiz-Lapuente, Fernando Comeron, Javier Mendez +8

The brightness of type Ia supernovae, and their homogeneity as a class, makes them powerful tools in cosmology, yet little is known about the progenitor systems of these explosions…

astro-ph2004★ 4 cited

Stability of Homogeneous Extra Dimensions

Torsten Bringmann, Martin Eriksson, Michael Gustafsson

In order not to be in conflict with observations it is crucial that extra dimensions, if they exist, are stable. It is shown that in the context of homogeneous extra dimensions, th…

astro-ph2004★ 42 cited

Spectroscopic confirmation of high-redshift supernovae with the ESO VLT

C. Lidman, D. A. Howell, G. Folatelli +44

We present VLT FORS1 and FORS2 spectra of 39 candidate high-redshift supernovae that were discovered as part of a cosmological study using Type Ia supernovae (SNe Ia) over a wide r…

astro-ph2004★ 59 cited

Limiting the dimming of distant type Ia supernovae

Linda Ostman, Edvard Mortsell

Distant supernovae have been observed to be fainter than what is expected in a matter dominated universe. The most likely explanation is that the universe is dominated by an energy…

astro-ph2004★ 194 cited

Gamma Rays from Kaluza-Klein Dark Matter

Lars Bergstrom, Torsten Bringmann, Martin Eriksson +1

A TeV gamma-ray signal from the direction of the Galactic center (GC) has been detected by the H.E.S.S. experiment. Here, we investigate whether Kaluza-Klein (KK) dark matter annih…

astro-ph2004★ 110 cited

Hubble Space Telescope and Ground-Based Observations of SN 1993J and SN 1998S: CNO Processing in the Progenitors

Claes Fransson, Peter M. Challis, Roger A. Chevalier +13

Ground-based and Hubble Space Telescope observations are presented for SN 1993J and SN 1998S. SN 1998S shows strong, relatively narrow circumstellar emission lines of N III-V and C…

astro-ph2004★ 6 cited

New results from the Antarctic Muon And Neutrino Detector Array

Kurt Woschnagg

We present recent results from the Antarctic Muon And Neutrino Detector Array (AMANDA) on searches for high-energy neutrinos of extraterrestrial origin. We have searched for a diff…

astro-ph2004★ 119 cited

Directional statistics for WIMP direct detection

Ben Morgan, Anne M. Green, Neil J. C. Spooner

The direction dependence of the event rate in WIMP direct detection experiments provides a powerful tool for distinguishing WIMP events from potential backgrounds. We use a variety…

astro-ph2004★ 171 cited

Cosmological constraints on the dark energy equation of state and its evolution

Steen Hannestad, Edvard Mortsell

We have calculated constraints on the evolution of the equation of state of the dark energy, w(z), from a joint analysis of data from the cosmic microwave background, large scale s…

astro-ph2004★ 237 cited

Muon Track Reconstruction and Data Selection Techniques in AMANDA

The AMANDA Collaboration, J. Ahrens

The Antarctic Muon And Neutrino Detector Array (AMANDA) is a high-energy neutrino telescope operating at the geographic South Pole. It is a lattice of photo-multiplier tubes buried…

astro-ph2004★ 901 cited

DarkSUSY: Computing Supersymmetric Dark Matter Properties Numerically

P. Gondolo, J. Edsjo, P. Ullio +3

The question of the nature of the dark matter in the Universe remains one of the most outstanding unsolved problems in basic science. One of the best motivated particle physics can…

astro-ph2004★ 1 cited

INTEGRAL broadband spectroscopy of Vela X-1

P. Kretschmar, R. Staubert, I. Kreykenbohm +11

The wind-accreting X-ray binary pulsar and cyclotron line source Vela X-1 has been observed extensively during INTEGRAL Core Program observations of the Vela region in June-July an…

astro-ph2004★ 12 cited

Probing galaxy density profiles with future supernova surveys

Edvard Mortsell, Haakon Dahle, Steen Hannestad

In this paper we discuss the possibility to measure the Hubble parameter and the slope of galaxy density profiles using future supernova data. With future supernova surveys such as…

astro-ph2004★ 52 cited

Direct versus indirect detection in mSUGRA with self-consistent halo models

Joakim Edsjo, Mia Schelke, Piero Ullio

We perform a detailed analysis of the detection prospects of neutralino dark matter in the mSUGRA framework. We focus on models with a thermal relic density, estimated with high ac…

astro-ph2004★ 224 cited

The type IIn supernova 1994W: evidence for the explosive ejection of a circumstellar envelope

Nikolai N. Chugai, Sergei I. Blinnikov, Robert J. Cumming +6

We present and analyse spectra of the Type IIn supernova 1994W obtained between 18 and 203 days after explosion. During the luminous phase (first 100 d) the line profiles are compo…

astro-ph2004★ 67 cited

Search for Neutrino-Induced Cascades with AMANDA

the AMANDA Collaboration, M. Ackermann

We report on a search for electro-magnetic and/or hadronic showers (cascades) induced by high energy neutrinos in the data collected with the AMANDA II detector during the year 200…

astro-ph2004★ 76 cited

Type Ia supernova rate at a redshift of ~ 0.1

G. Blanc, C. Afonso, C. Alard +58

We present the type Ia rate measurement based on two EROS supernova search campaigns (in 1999 and 2000). Sixteen supernovae identified as type Ia were discovered. The measurement o…

astro-ph2004★ 121 cited

Spectroscopic Observations and Analysis of the Peculiar SN 1999aa

G. Garavini, G. Folatelli, A. Goobar +55

We present an extensive new time-series of spectroscopic data of the peculiar SN 1999aa in NGC 2595. Our data set includes 25 optical spectra between -11 and +58 days with respect…

astro-ph2004★ 4 cited

Modeling the Radio and X-ray Emission of SN 1993J and SN 2002ap

Claes Fransson, Claes-Ingvar Bjornsson

Modeling of radio and X-ray observations of supernovae interacting with their circumstellar media are discussed, with special application to SN 1993J and SN 2002ap. We emphasize th…

astro-ph2004★ 50 cited

No evidence for Dark Energy Metamorphosis ?

J. Jonsson, A. Goobar, R. Amanullah +1

Recent attempts to fit Type Ia supernova data by modeling the dark energy density as a truncated Taylor series have suggested the possibility of metamorphosis, i.e., a rapidly evol…

astro-ph2004★ 23 cited

Accretion Disc Evolution in DW Ursae Majoris: A Photometric Study

V. Stanishev, Z. Kraicheva, H. M. J. Boffin +3

We present an analysis of CCD photometric observations of the eclipsing novalike cataclysmic variable DW UMa obtained in two different luminosity states: high and intermediate. The…