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Probing the parameter space of HD 49933: a comparison between global and local methods
comparison global local methods
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2010/11/16
We present two independent methods for studying the global stellar parameter space (mass M, age, chemical composition X0, Z0) of HD 49933 with seismic data. Using a local minimization and an MCMC algo...
Hubble Space Telescope Studies of Nearby Type Ia Supernovae: The Mean Maximum Light Ultraviolet Spectrum and its Dispersion
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
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2010/12/28
We present the first results of an ongoing campaign using the STIS spectrograph on-board the Hubble Space Telescope (HST) whose primary goal is the study of near ultraviolet (UV) spectra of local Type...
Reply to 'A Comment on '"The Far Future of Exoplanet Direct Characterization" - the Case for Interstellar Space Probes'
Earth and Planetary Astrophysics (astro-ph.EP) Instrumentation and Methods for Astrophysics (astro-ph.IM)
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2010/12/28
Reply to A Comment on The Far Future of Exoplanet Direct Characterization - the Case for Interstellar Space Probess by Ian Crawford. The paper The Far Future of Exoplanet Direct Characterization resul...
Probing Very Bright-End of Galaxy Luminosity Function at z >~ 7 Using Hubble Space Telescope Pure Parallel Observations
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
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2010/12/29
We report the first results from the Hubble Infrared Pure Parallel Imaging Extragalactic Survey, which utilizes the pure parallel orbits of the Hubble Space Telescope to do deep imaging along a large ...
A Comment on "The Far Future of Exoplanet Direct Characterization" - the Case for Interstellar Space Probes
Instrumentation and Methods for Astrophysics (astro-ph.IM) Earth and Planetary Astrophysics (astro-ph.EP) Galaxy Astrophysics (astro-ph.GA)
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2010/12/27
Following on from ideas presented in a recent paper by Schneider et al. (2010) on "The Far Future of Exoplanet Direct Characterization", I argue that they have exaggerated the technical obstacles to p...
The Hubble Space Telescope GOODS NICMOS Survey: Overview and the Evolution of Massive Galaxies at 1.5 < z < 3
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
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2010/12/24
We present the details and early results from a deep near-infrared survey utilising the NICMOS instrument on the Hubble Space Telescope centred around massive M_* > 10^11 M_0 galaxies at 1.7 < z < 2.9...
The far-infrared view of M87 as seen by the Herschel Space Observatory
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
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2010/12/24
The origin of the far-infrared emission from the nearby radio galaxy M87 remains a matter of debate. Some studies find evidence of a far-infrared excess due to thermal dust emission, whereas others pr...
Interacting agegraphic dark energy models in phase space
Cosmology and Extragalactic Astrophysics (astro-ph.CO) General Relativity and Quantum Cosmology (gr-qc) High Energy Physics - Phenomenology (hep-ph) High Energy Physics - Theory (hep-th)
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2010/12/23
Agegraphic dark energy, has been recently proposed, based on the so-called Karolyhazy uncertainty relation, which arises from quantum mechanics together with general relativity. In the first part of t...
Dark energy constraints from a space-based supernova survey
Cosmology and Extragalactic Astrophysics (astro-ph.CO)
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2010/12/23
We present a forecast of dark energy constraints that could be obtained from a large sample of distances to Type Ia supernovae detected and measured from space. We simulate the supernova events as the...
Transiting exoplanets from the CoRoT space mission. XV. CoRoT-15b: a brown dwarf transiting companion
Earth and Planetary Astrophysics (astro-ph.EP)
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2010/12/23
We report the discovery by the CoRoT space mission of a transiting brown dwarf orbiting a F7V star with an orbital period of 3.06 days. CoRoT-15b has a radius of 1.12 +0.30 -0.15 Rjup, a mass of 63.3 ...
Space Weather Effects of Coronal Mass Ejection
Coronal mass ejection interplanetary medium global positioning system total electron content interplanetary magnetic field
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2010/9/16
This paper describes the space weather effects of a major CME which was accompanied by extremely violent events on the Sun.The signatures of the event in the interplanetary medium (IPM) sensed by Ooty...
Transient Perturbations and their Effects in the Heliosphere, the Geomagnetosphere, and the Earth’s Atmosphere: Space Weather Perspective
Space weather geomagnetic storm cosmic ray Forbush decrease interplanetary shock coronal mass ejection
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2010/9/16
We discuss the effects of certain dynamic features of space environment in the heliosphere, the geo-magnetosphere, and the earth’s atmosphere. In particular, transient perturbations in solar wind plas...
Ionospheric response to the space weather event of 18 November 2003 -- An investigation
Solar flare cornal ejection lonospheric effect
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2010/11/16
Ionospheric response to the space weather event of 18 November 2003 -- An investigation.
In 2006 there was an outcry from many astronomers when Pluto was stripped of its planetary status and renamed as a dwarf planet. The aggrieved feel that the distinction is rather arbitrary, especially...
The universal distribution of halo interlopers in projected phase space. Bias in galaxy cluster concentration and velocity anisotropy?
Galaxies clusters general Cosmology miscellaneous (Cosmology) dark matter Galaxies halos Gravitational lensing weak Methods numerical
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2010/3/9
When clusters of galaxies are viewed in projection, one cannot avoid picking up foreground/background interlopers, that lie within the virial cone (VC), but outside the virial sphere. Structural and k...