Parsec-scale magnetic field structures in HEAO-1 BL Lacs

Show simple item record Kharb, P. Gabuzda, Denise Shastri, P. 2017-11-07T09:38:57Z 2017-11-07T09:38:57Z 2008
dc.identifier.citation Kharb, P., Gabuzda, D. and Shastri, P. (2008) 'Parsec-scale magnetic field structures in HEAO-1 BL Lacs', Monthly Notices of the Royal Astronomical Society, 384(1), pp. 230-250. doi: 10.1111/j.1365-2966.2007.12690.x en
dc.identifier.volume 384
dc.identifier.issued 1
dc.identifier.startpage 230
dc.identifier.endpage 250
dc.identifier.issn 0035-8711
dc.identifier.doi 10.1111/j.1365-2966.2007.12690.x
dc.description.abstract We present very long baseline interferometry polarization images of an X-ray-selected sample of BL Lacertae objects belonging to the first HEAO-1 and the ROSAT - Green Bank (RGB) surveys. These are primarily high-energy-peaked BL Lacs (HBLs) and exhibit core - jet radio morphologies on pc scales. They show moderately polarized jet components, similar to those of low-energy-peaked BL Lacs (LBLs). The fractional polarization in the unresolved cores of the HBLs is, on average, lower than in the LBLs, while the fractional polarizations in the pc-scale jets of HBLs and LBLs are comparable. However, a difference is observed in the orientation of the inferred jet magnetic fields - while LBL jets are well known to preferentially exhibit transverse magnetic fields, the HBL jets tend to display longitudinal magnetic fields. Although a 'spine-sheath' jet velocity structure, along with larger viewing angles for HBLs could produce the observed magnetic field configuration, differences in other properties of LBLs and HBLs, such as their total radio power, cannot be fully reconciled with the different-angle scenario alone. Instead it appears that LBLs and HBLs differ intrinsically, perhaps in the spin rates of their central black holes. en
dc.description.sponsorship Joint Institute for VLBI ERIC (Summer Studentship)
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Oxford University Press en
dc.rights © 2008, the Authors. Journal compilation © 2008, RAS en
dc.subject Polarization en
dc.subject BL Lacertae objects en
dc.subject General en
dc.title Parsec-scale magnetic field structures in HEAO-1 BL Lacs en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Denise Gabuzda, Physics, University College Cork, Cork, Ireland. +353-21-490-3000 Email: en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.contributor.funder European Commission
dc.description.status Peer reviewed en
dc.identifier.journaltitle Monthly Notices of the Royal Astronomical Society en
dc.internal.IRISemailaddress en
dc.relation.project info:eu-repo/grantAgreement/NWO//1700115818/NL/Joint Institute for VLBI in Europe (JIVE)/

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