Search results for "Cosmology observations"

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GRB 030227: The first multiwavelength afterglow of an INTEGRAL GRB

2003

We present multiwavelength observations of a gamma-ray burst detected by INTEGRAL (GRB 030227) between 5.3 hours and ~1.7 days after the event. Here we report the discovery of a dim optical afterglow (OA) that would not have been detected by many previous searches due to its faintess (R~23). This OA was seen to decline following a power law decay with index Alpha_R= -0.95 +/- 0.16. The spectral index Beta_opt/NIR yielded -1.25 +/- 0.14. These values may be explained by a relativistic expansion of a fireball (with p = 2.0) in the cooling regime. We also find evidence for inverse Compton scattering in X-rays.

PhysicsSpectral indexBurstsAstrophysics (astro-ph)Gamma raysCompton scatteringbursts [gamma rays]FOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsGamma rays ; Bursts ; Photometric ; Cosmology observationsPhotometricUNESCO::ASTRONOMÍA Y ASTROFÍSICAAstrophysicsCosmology observationsPower law:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]observations [cosmology]Afterglowphotometric [techniques]Space and Planetary ScienceAstronomy Astrophysics and CosmologyUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogoniaGamma-ray burst:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]
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Galaxy clusters and groups in the ALHAMBRA survey

2015

Ascaso, Begoña et al.

Cosmology and Nongalactic Astrophysics (astro-ph.CO)Large-scale structure of UniverseFOS: Physical sciencesAstrophysicsX-rays galaxies clustersclusters: general [Galaxies]Galaxies clusters generalobservations [Cosmology]Galaxy clusterPhysics[SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph]Cosmology: observationsFísicaAstronomyGalaxies: evolutionAstronomy and Astrophysicsevolution [Galaxies]Cosmology observationsCataloguesGalaxies evolutionSpace and Planetary Science[SDU]Sciences of the Universe [physics]X-rays: galaxies: clustersgalaxies: clusters [X-rays]Galaxies: clusters: generalAstrophysics - Cosmology and Nongalactic Astrophysics
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