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

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dc.contributor.authorKharb, P.
dc.contributor.authorGabuzda, Denise
dc.contributor.authorShastri, P.
dc.contributor.funderEuropean Commission
dc.date.accessioned2017-11-07T09:38:57Z
dc.date.available2017-11-07T09:38:57Z
dc.date.issued2008
dc.description.abstractWe 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.sponsorshipJoint Institute for VLBI ERIC (Summer Studentship)
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationKharb, 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.xen
dc.identifier.doi10.1111/j.1365-2966.2007.12690.x
dc.identifier.endpage250
dc.identifier.issn0035-8711
dc.identifier.issued1
dc.identifier.journaltitleMonthly Notices of the Royal Astronomical Societyen
dc.identifier.startpage230
dc.identifier.urihttps://hdl.handle.net/10468/4977
dc.identifier.volume384
dc.language.isoenen
dc.publisherOxford University Pressen
dc.relation.projectinfo:eu-repo/grantAgreement/NWO//1700115818/NL/Joint Institute for VLBI in Europe (JIVE)/
dc.relation.urihttps://academic.oup.com/mnras/article-lookup/doi/10.1111/j.1365-2966.2007.12690.x
dc.rights© 2008, the Authors. Journal compilation © 2008, RASen
dc.subjectPolarizationen
dc.subjectBL Lacertae objectsen
dc.subjectGeneralen
dc.titleParsec-scale magnetic field structures in HEAO-1 BL Lacsen
dc.typeArticle (peer-reviewed)en
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