SIMBAD references

1999A&A...351...59G - Astronomy and Astrophysics, volume 351, 59-64 (1999/11-1)

Synchrotron and inverse compton variability in the BL lacertae object S5 0716+714.

GIOMMI P., MASSARO E., CHIAPPETTI L., FERRARA E.C., GHISELLINI G., JANG M., MAESANO M., MILLER H.R., MONTAGNI F., NESCI R., PADOVANI P., PERLMAN E., RAITERI C.M., SCLAVI S., TAGLIAFERRI G., TOSTI G. and VILLATA M.

Abstract (from CDS):

We report intensity variations of different spectral components in the BL Lac object S5 0716+714 detected during coordinated BeppoSAX and optical observations in 1996 and 1998. The transition between synchrotron and inverse Compton emission has been clearly detected as sharp X-ray spectral breaks at around 2-3keV on both occasions. Correlated optical and soft X-ray variability was found during the second BeppoSAX pointing when intensive optical monitoring could be arranged. The hard (Compton) component changed by a factor of 2 between the two observations, but remained stable within each exposure. During events of rapid variability S5 0716+714 showed spectral steepening with intensity, a behaviour rarely observed in BL Lacs. We interpret these findings as the probable consequence of a shift of the synchrotron peak emission from the IR/optical band to higher energies, causing the synchrotron tail to push into the soft X-ray band more and more as the source brightens.

Abstract Copyright:

Journal keyword(s): radiation mechanisms: non-thermal - galaxies: active - galaxies: BL Lacertae objects: individual: S5 0716+714 - X-rays: galaxies

Simbad objects: 5

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2023.02.03-01:29:56

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