A sample of low-redshift BL Lacertae objects. II. EVN and MERLIN data and multi-wavelength analysis

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dc.creatorGiroletti, M.
dc.creatorGiovannini, G.
dc.creatorTaylor, G. B.
dc.creatorFalomo, R.
dc.date2006-04-10
dc.date.accessioned2026-07-07T10:43:47Z
dc.date.available2026-07-07T10:43:47Z
dc.descriptionWe present new radio observations of 9 members of a sample of 29 nearby (z < 0.2) BL Lac objects. The new data have been obtained with the European VLBI Network and/or the MERLIN at 1.6 and 5 GHz and complement previous observations. For one object, the TeV source Mrk 421, we also present deep multi-epoch VLBA and Global VLBI data, which reveal a resolved diffuse jet, with clear signatures of limb brightening. We use the new and old data to estimate physical parameters of the jets of the sample from which the subset with new radio data is drawn. We derive Doppler factors in the parsec scale radio jet in the range ~2 < delta < ~9. Using HST data, we separate the contribution of the host galaxy from that of the active core. From the measured and de-beamed observables, we find a weak correlation between radio power and black hole mass, and a tight correlation between radio and optical core luminosities. We interpret this result in terms of a common synchrotron origin, with little contribution from a radiatively efficient accretion disk. The BL Lacs in our sample have de-beamed properties similar to low power radio galaxies, including the fundamental plane of black hole activity.
dc.descriptionAccepted by ApJ. 17 pages
dc.identifierhttps://arxiv.org/abs/astro-ph/0604224
dc.identifierhttp://arxiv.org/abs/astro-ph/0604224
dc.identifierAstrophys.J.646:801-814,2006
dc.identifierdoi:10.1086/504971
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/182368
dc.subjectAstrophysics
dc.titleA sample of low-redshift BL Lacertae objects. II. EVN and MERLIN data and multi-wavelength analysis
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