2009A&A...508L..31P


Query : 2009A&A...508L..31P

2009A&A...508L..31P - Astronomy and Astrophysics, volume 508, L31-34 (2009/12-4)

Power for dry BL Lacertae objects.

PAGGI A., CAVALIERE A., VITTORINI V. and TAVANI M.

Abstract (from CDS):

Is it significant that the intrinsic outputs of several BL Lacs are observed to level off at values of about 1046erg/s In searching for an answer, we compare γ-ray observations by the AGILE satellite of the BL Lac S5 0716+714 with those of Mrk 421 and Mrk 501; the former are particularly marked by intense flares up to fluxes of 2x10–6photons/cm2/s in the 0.1-10GeV energy range. These ``dry'' BL Lacs show evidence of neither thermal disk emissions nor emission lines signaling any accreting or surrounding gas; the spectral distributions of their pure non-thermal radiations are effectively represented by the synchrotron self-Compton process. With source parameters correspondingly derived and tuned with simultaneous multiwavelength observations, we find for S5 0716+714 a total jet power of about 3x1045erg/s, which makes it one of the brightest dry BL Lacs so far detected in γ rays. We evaluate the mass of the associated Kerr hole to be around 5x108M, implying that the source is significantly gauged in terms of the maximal power around 4x1045erg/s extractable via the Blandford-Znajek electrodynamical mechanism; other dry BL Lacs observed in γ rays remain well below that threshold. These findings and those forthcoming from Fermi-LAT will provide a powerful test of electrodynamics in the surroundings of the hole, that are dominated by GR effects.

Abstract Copyright:

Journal keyword(s): BL Lacertae objects: general - radiation mechanisms: non-thermal - black hole physics - accretion, accretion disks

Simbad objects: 7

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Number of rows : 7
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 8C 0716+714 BLL 07 21 53.4482942664 +71 20 36.363846516   15.5 14.17 14.27   ~ 1232 1
2 ZwCl 0735+7421 ClG 07 41 40.3 +74 14 58     17.70     ~ 236 0
3 Mrk 421 BLL 11 04 27.3140835504 +38 12 31.798495872   13.50 12.90 8.31   ~ 2553 1
4 ACO 2029 ClG 15 10 58.7 +05 45 42           ~ 901 0
5 BAX 241.2375+23.9206 ClG 16 04 57.0 +23 55 14     14.38     ~ 126 0
6 4C 39.49 BLL 16 53 52.21668403 +39 45 36.6088754 14.09 14.15 13.29 8.26   ~ 2052 2
7 NAME BL Lac BLL 22 02 43.2913536816 +42 16 39.979416792   15.66 14.72     ~ 2162 1

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2022.12.01-22:55:42

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