A5102820007- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Astronomical Observations and Instrumentation
- Adaptive optics and wavefront sensing
- Galaxies: Formation, Evolution, Phenomena
- Astro and Planetary Science
- History and Developments in Astronomy
- Laser-Plasma Interactions and Diagnostics
- Advanced optical system design
- X-ray Spectroscopy and Fluorescence Analysis
- Particle Accelerators and Free-Electron Lasers
- Atomic and Molecular Physics
- High-pressure geophysics and materials
- Optical Systems and Laser Technology
- Radiation Therapy and Dosimetry
- Pulsars and Gravitational Waves Research
- Solar and Space Plasma Dynamics
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Planetary Science and Exploration
- Cosmology and Gravitation Theories
- SAS software applications and methods
- Fossil Insects in Amber
European Southern Observatory
2004-2024
European Southern Observatory
2002-2010
Osservatorio Astronomico di Padova
2008
National Institute for Astrophysics
2008
The University of Tokyo
2008
Tokyo University of Science
2008
Queen's University Belfast
2008
Max Planck Institute for Astrophysics
2008
Michigan Science Center
2008
Atacama Large Millimeter Submillimeter Array
2003
The only supernovae (SNe) to show gamma-ray bursts (GRBs) or early x-ray emission thus far are overenergetic, broad-lined type Ic SNe (hypernovae, HNe). Recently, SN 2008D has shown several unusual features: (i) weak flash (XRF), (ii) an early, narrow optical peak, (iii) disappearance of the broad lines typical HNe, and (iv) development helium as in Ib. Detailed analysis shows that was not a normal supernova: Its explosion energy (E approximately 6x10(51) erg) ejected mass [ 7 times Sun...
The K20 survey is an ESO VLT optical and near-infrared spectroscopic aimed at obtaining spectral information redshifts of a complete sample about 550 objects to over two independent fields with total area 52 arcmin2. In this paper we discuss the scientific motivation such survey, describe photometric properties sample, release Ks-band catalog. Extensive simulations showed that photometrically highly . observed galaxy counts color distribution are consistent literature results. We...
We present photometric and spectroscopic observations of the gamma-ray burst GRB 021211 obtained during late stages its afterglow. The light curve shows a rebrightening occurring ~25 days after GRB. analysis VLT spectrum bump (27 GRB) reveals suggestive resemblance with prototypical type-Ic SN 1994I, about ~10 past maximum light. Particularly we have measured strong, broad absorption feature at 3770 A, which identified Ca II blueshifted by ~14400 km/s, thus indicating that supernova (SN)...
The EELT is a project led by ESO on behalf of its 14 member states. in Phase B (detailed design), 3-year, 57.2 M activity that will result Proposal for Construction June 2010. requirements the basic reference design, starting point current phase, were defined through community process to convergence earlier concepts into single European project: 42m adaptive telescope based novel 5-mirror design scheduled have first light 2017. This paper reports status activities, development, and progress...
view Abstract Citations (73) References (118) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Ultraviolet Observations of SN 1987A with the IUE Satellite Pun, Chun S. J. ; Kirshner, Robert P. Sonneborn, George Challis, Peter Nassiopoulos, Arquilla, Richard Crenshaw, D. Michael Shrader, Chris Teays, Terry Cassatella, Angelo Gilmozzi, Roberto Talavera, Antonio Wamsteker, Willem Fransson, Claes Panagia, Nino (λ: 1150-3300 A) observations satellite provide a...
The "shell" of the recurrent nova T Pyxidis has been resolved with HST imagery into more than two thousand individual knots. Hydrogen and [N II] emission have very similar spatial distributions. Four epochs observation allow us to place an upper limit 40 km/s on systematic expansion velocity This is in contrast our 1985 long slip spectra which show differential velocities 350 km/s, post-outburst (1966) almost three times larger. azimuthally averaged surface brightness radial distribution...
Multi-Conjugate Adaptive Optics (MCAO) is working on the principle to perform wide field of view atmospheric turbulence correction using many Guide Stars located in and/or surrounding observed target. The vertical distribution reconstructed by observing several guide stars and applied some deformable mirrors optically conjugated at different altitudes above telescope. European Southern Observatory together with external research institutions going build a Demonstrator (MAD) adaptive optics...
Context. T Pyx is one of the most enigmatic recurrent novae, and it has been proposed as a potential Galactic type-Ia supernova progenitor. Aims. Using spatially resolved data obtained with MUSE, we characterized geometrical distribution material expelled in previous outbursts surrounding white dwarf Methods. We used 3D model for ejecta to determine geometric extended remnant. also calculated nebular parallax distance ( d = 3.55 ± 0.77 kpc) based on measured velocity spatial shift 2011...
We describe the results of a project to study combined ultraviolet- optical spectrum Seyfert I galaxy NGC 5548 over period 1978- 1986. Of many spectrophotometric observations made with typical resolution 5-8 A, 11 epochs were simultaneous and nine cover range from 1150 7000 A. The IUE ground-based observations, frequently obtained only few days apart, enable us study, for first time, time variability UV lines, overall shape nonstellar continuum, relations between two. variable continuum was...
Aims. We compare the observed and theoretical parameters for quiescent outburst phases of recurring nova T Pyx.
We explore the scientific case and conceptual feasibility of giant filled aperture telescopes, in light science goals needing an order magnitude increase size, investigate requirements (and challenges) these imply for possible technical options a 100 m telescope. The 100-m f/6.4 telescope optical concept is four mirror design with segmented, spherical primary secondary mirrors, 8-m class aspheric tertiary quaternary providing 3 arc minutes field view. Building on experience VLT other large...
view Abstract Citations (58) References (5) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Some Comments on the Astrometric Properties of Guide Star Catalog Taff, L. G. ; Lattanzi, M. Bucciarelli, B. Gilmozzi, R. McLean, J. Jenkner, H. Laidler, V. Lasker, Shara, Sturch, C. The first version Hubble Space Telescope has been completed and released. Consideration is given to principal aspects positional system, its systematic errors (which occur relative a...
Aims.A test of Newton's law gravity in the low acceleration regime using globular clusters is presented and new results for core collapsed cluster NGC 7099 given.
Context. Strings and other alternative theories describing the quantum properties of space-time suggest that could present a foamy structure also that, in certain cases, gravity (QG) may manifest at energies much below Planck scale. One observable effects be degradation diffraction images distant sources.
view Abstract Citations (66) References (102) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Nature of the Recurrent Nova T Coronae Borealis: Ultraviolet Evidence for a White Dwarf Accretor Selvelli, Pier L. ; Cassatella, Angelo Gilmozzi, Roberto Data from eleven years IUE observations CrB during its quiescent phase suggest that white dwarf accretor rather than main-sequence star is hot component system. spectroscopic and photometric behavior 1946...
The second decade of the third millennium AD will hopefully see a new generation ground-based telescopes, from 20- to 100-m in diameter, that open completely window on Universe. Here I review scientific as well technological drivers underlie projects, looking at how they interact pushing limits parameter space and driving design requirements, some challenges bring. As one may expect, much preparatory work, both industrial, is largely "concept independent", indicating synergy rather than...
Radial velocity observations from the Crab Nebula are used to investigate its three-dimensional properties. In standard model, it consists of a thick, hollow shell, with synchrotron emission within. We show that thick shell is composed bright inner and faint outer components surrounded by higher halo. Filaments generally circumferential, but radial 'spokes' link shells. There spectral differences between two extremities shell. The Nebula's confined within system sharp discontinuity in brightness at
Aims. We present an overview of the UV spectral properties old novae as a class. The data and results this paper, together with from outburst phases, will be utilized in follow-up study to determine statistical investigate correlations among physical parameters quiescent eruptive phases.
Extremely large filled-aperture ground-based optical-IR telescopes, or ELTs, ranging from 20 to 100m in diameter, are now being proposed. The all-important choice of the aperture must clearly be driven by potential science offered. We here highlight goals Leiden Workshop May 2001 suggesting that for certain critical observations largest possible - assumed (the proposed European OverWhelmingly Large telescope (OWL) is strongly desired. Examples a long list include: COSMOLOGY: * Identifying...
view Abstract Citations (49) References (29) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Hubble Space Telescope Observations of X-Ray Nova MUSCAE 1991 and Its Spectral Evolution Cheng, F. H. ; Horne, Keith Panagia, N. Shrader, C. R. Gilmozzi, Paresce, Lund, Faint Object Spectrograph (FOS) Camera (FOC) observations Muscae obtained on May 14-15, are presented discussed. A nearly featureless continuum with broad 2200 absorption feature no Balmer jump is...