SIMBAD references

2018ApJ...853...34Z - Astrophys. J., 853, 34-34 (2018/January-3)

Extremely rapid X-ray flares of TeV blazars in the RXTE era.

ZHU S.F., XUE Y.Q., BRANDT W.N., CUI W. and WANG Y.J.

Abstract (from CDS):

Rapid flares from blazars in very high-energy (VHE) γ-rays challenge the common understanding of jets of active galactic nuclei (AGNs). The same population of ultra-relativistic electrons is often thought to be responsible for both X-ray and VHE emission. We thus systematically searched for X-ray flares at sub-hour timescales of TeV blazars in the entire Rossi X-ray Timing Explorer archival database. We found rapid flares from PKS 2005-489 and S5 0716+714, and a candidate rapid flare from 1ES 1101-232. In particular, the characteristic rise timescale of PKS 2005-489 is less than half a minute, which, to our knowledge, is the shortest among known AGN flares at any wavelengths. The timescales of these rapid flares indicate that the size of the central supermassive black hole is not a hard lower limit on the physical size of the emission region of the flare. PKS 2005-489 shows possible hard lags in its flare, which could be attributed to particle acceleration (injection); its flaring component has the hardest spectrum when it first appears. For all flares, the flaring components show similar hard spectra with Γ=1.7–1.9, and we estimate the magnetic field strength B ∼ 0.1-1.0 G by assuming synchrotron cooling. These flares could be caused by inhomogeneity of the jets. Models that can only produce rapid γ-ray flares but little synchrotron activity are less favorable.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: active - galaxies: jets - gamma rays: galaxies - X-rays: galaxies - X-rays: galaxies

Simbad objects: 32

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2019.10.19-13:37:28

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