Author: Nicastro M

0000000000896786

AUTHOR

Nicastro M

showing 1 related works from this author

Long term X-ray spectral variability of the nucleus of M81

2003

We have analysed the soft X-ray emission from the nuclear source of the nearby spiral galaxy M81, using the available data collected with ROSAT, ASCA, BeppoSAX and Chandra. The source flux is highly variable, showing (sometimes dramatic: a factor of 4 in 20 days) variability at different timescales, from 2 days to 4 years, and in particular a steady increase of the flux by a factor of >~ 2 over 4 years, broken by rapid flares. After accounting for the extended component resolved by Chandra, the nuclear soft X-ray spectrum (from ROSAT/PSPC, BeppoSAX/LECS and Chandra data) cannot be fitted well with a single absorbed power-law model. Acceptable fits are obtained adding an extra component, …

PhysicsSolar massSpiral galaxyAstrophysics::High Energy Astrophysical PhenomenaAstrophysics (astro-ph)FluxFOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsRadiusAstrophysics::Cosmology and Extragalactic AstrophysicsAstrophysicsBlack holeRotating black holeSpace and Planetary ScienceROSATX-ray x rays sources ULXsAbsorption (electromagnetic radiation)Astrophysics::Galaxy Astrophysics

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PEPhysical Sciences and Engineering
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