2007A&A...462...29G


Query : 2007A&A...462...29G

2007A&A...462...29G - Astronomy and Astrophysics, volume 462, 29-41 (2007/1-4)

Unveiling the X-ray/TeV engine in Mkn 421.

GIEBELS B., DUBUS G. and KHELIFI B.

Abstract (from CDS):

Our goal was to find important clues concerning particle acceleration in relativistic jets through the analysis of multi-wavelength observations of TeV blazars. Simultaneous observations of Mkn 421 were taken in very high energy γ-rays (>200GeV, CAT experiment), X-rays (RXTE), and optical (KVA). Multi-day RXTE observations are also presented, allowing for detailed modelling of the spectral variability. Short timescale (≃30mn) variations in VHE γ-rays are found, correlated with X-rays, but not with the optical. The X-ray spectrum hardens with flux until the photon indices saturate above a threshold flux ≃10–9erg/s/cm2. The fractional variability decreases from X-rays to optical as a power law with Fvar∝E0.24±0.01. The full spectral energy distribution is well-fitted by synchrotron self-Compton emission from cooling electrons injected with a Maxwellian distribution of characteristic energy γb. Fluctuations in the injected power with Pinj∝γb4 explain the observed variability. The spectral saturation and the power-law dependence of the fractional variability are novel results that may extend to other TeV blazars. The ability of Maxwellian injections to reproduce the observed features suggest second-order Fermi acceleration or magnetic reconnection may play the dominant role in particle acceleration.

Abstract Copyright:

Journal keyword(s): acceleration of particles - radiation mechanisms: non-thermal - galaxies: active - BL Lacertae objects: individual: Mkn 421 - gamma rays: observations - X-rays: galaxies

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 V* CM Tau Psr 05 34 31.9474694616 +22 00 52.153698024           ~ 5104 0
2 M 1 SNR 05 34 32 +22 00.8           ~ 6004 1
3 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2568 1
4 4C 39.49 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2067 2
5 QSO B1959+650 BLL 19 59 59.8520303688 +65 08 54.652536492     12.8 11.21   ~ 571 2
6 QSO B2155-304 BLL 21 58 52.0652249880 -30 13 32.118447792   13.36 13.09 12.62   ~ 1672 1

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2023.02.04-10:50:33

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