X-ray and ultraviolet observations of the Seyfert galaxy MCG 8-11-11

Journal Article · Wed Aug 01 00:00:00 EDT 1990 · Astrophysical Journal; (USA)

DOI:https://doi.org/10.1086/169037· OSTI ID:6550593

Treves, A; Maraschi, L; Bonelli, G; Chiappetti, L; Falomo, R ^[1]

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1. Milano Universita, Milan (Italy) CNR, Istituto di Fisica Cosmica, Milan (Italy) Padova, Osservatorio Astronomico, Padua (Italy)

MCG 8-11-11 was observed in the 0.5-8 keV band with the EXOSAT observatory at 9 epochs in 1983-1986. Quasi-simultaneous UV observations were obtained in all but one case. The X-ray spectra are well fitted by absorbed power laws. Small variations of the spectral shape are found with softening of the source at brighter states. No correlation between UV and X-ray fluxes is apparent, suggesting an independent origin of the UV, consistent with the absence of indication of a soft X-ray excess. 32 refs.

• OSTI ID: 6550593
• Journal Information: Astrophysical Journal; (USA), Vol. 359; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SEYFERT GALAXIES
ULTRAVIOLET SPECTRA
X-RAY SPECTRA
ACCRETION DISKS
BREMSSTRAHLUNG
COMPTON EFFECT
CORRELATIONS
ORIGIN
SATELLITES
VARIATIONS
BASIC INTERACTIONS
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
GALAXIES
INTERACTIONS
RADIATIONS
SCATTERING
SPECTRA
640105* - Astrophysics & Cosmology- Galaxies