2021A&A...647A..88A


Query : 2021A&A...647A..88A

2021A&A...647A..88A - Astronomy and Astrophysics, volume 647A, 88-88 (2021/3-1)

The relentless variability of Mrk 421 from the TeV to the radio.

ARBET-ENGELS A., BAACK D., BALBO M., BILAND A., BLANK M., BRETZ T., BRUEGGE K., BULINSKI M., BUSS J., DOERR M., DORNER D., ELSAESSER D., HILDEBRAND D., MANNHEIM K., MUELLER S.A., NEISE D., NOETHE M., PARAVAC A., RHODE W., SCHLEICHER B., SEDLACZEK K., SHUKLA A., SLIUSAR V., WALTER R. and VON WILLERT E.

Abstract (from CDS):


Context. The origin of the γ-ray emission of the blazar Mrk 421 is still a matter of debate.
Aims. We used 5.5 years of unbiased observing campaign data, obtained using the FACT telescope and the Fermi-LAT detector at TeV and GeV energies, the longest and densest so far, together with contemporaneous multi-wavelength observations, to characterise the variability of Mrk 421 and to constrain the underlying physical mechanisms.
Methods. We studied and correlated light curves obtained by ten different instruments and found two significant results.
Results. The TeV and X-ray light curves are very well correlated with a lag of <0.6 days. The GeV and radio (15GHz band) light curves are widely and strongly correlated. Variations of the GeV light curve lead those in the radio.
Conclusions. Lepto-hadronic and purely hadronic models in the frame of shock acceleration predict proton acceleration or cooling timescales that are ruled out by the short variability timescales and delays observed in Mrk 421. Instead the observations match the predictions of leptonic models.

Abstract Copyright: © ESO 2021

Journal keyword(s): astroparticle physics - radiation mechanisms: non-thermal - BL Lacertae objects: individual: Mrk 421 - radiative transfer

VizieR on-line data: <Available at CDS (J/A+A/647/A88): fig1fact.dat fig1ferm.dat fig1bat.dat fig1maxi.dat fig1xrth.dat fig1xrts.dat fig1uvot.dat fig1vban.dat fig1radi.dat>

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 - 2022
#notes
1 M 1 SNR 05 34 32 +22 00.8           ~ 5903 1
2 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 14.17 14.27   ~ 1206 1
3 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2512 1
4 * 51 UMa PM* 11 04 31.2283728072 +38 14 28.900070520   6.18 6.02 7.39 5.86 A3III-IV 74 0
5 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 5558 1
6 4C 39.49 BLL 16 53 52.2160772976 +39 45 36.613228860 14.09 14.15 13.29 8.26   ~ 2016 2

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2022.05.24-11:51:16

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