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dc.contributor.authorStevens, J. A.
dc.contributor.authorGear, W.K.
dc.date.accessioned2007-10-11T15:54:44Z
dc.date.available2007-10-11T15:54:44Z
dc.date.issued1999
dc.identifier.citationStevens , J A & Gear , W K 1999 , ' Variations in the broad-band spectra of BL Lac objects: millimetre observations of an X-ray-selected sample ' , Monthly Notices of the Royal Astronomical Society , vol. 307 , no. 2 , pp. 403-412 . https://doi.org/10.1046/j.1365-8711.1999.02575.x
dc.identifier.issn0035-8711
dc.identifier.otherPURE: 171190
dc.identifier.otherPURE UUID: cc8c49b7-c39d-45b4-b52f-07234d0ec533
dc.identifier.otherdspace: 2299/889
dc.identifier.otherScopus: 0001378256
dc.identifier.urihttp://hdl.handle.net/2299/889
dc.descriptionThe definitive version is available at www.blackwell-synergy.com '.--Copyright Blackwell Publishing DOI : 10.1046/j.1365-8711.1999.02575.x
dc.description.abstractObservations at millimetre wavelengths are presented for a representative sample of 22 X-ray-selected BL Lac objects (XBLs). This sample comprises 19 High-energy cutoff BL Lacs objects (HBLs), 1 Low-energy cutoff BL Lac object (LBL) and 2 ‘inter- mediate’ sources. Data for LBLs, which are mostly radio selected BL Lac objects (RBLs) are taken from the literature. It is shown that the radio–millimetre spectral indices of HBLs (¯α5−230 = −0.29 ± 0.15) are slightly steeper than those of the LBLs (¯α5−230 = −0.19 ± 0.14). A correlation exists between α5−230 and 230 GHz luminos- ity. While this correlation could be an artefact of comparing two populations of BL Lac objects with intrinsically different radio properties it is also consistent with the predictions of existing unified schemes which relate BL Lac objects to Fanaroff-Riley class I radio galaxies.en
dc.language.isoeng
dc.relation.ispartofMonthly Notices of the Royal Astronomical Society
dc.rightsOpen
dc.titleVariations in the broad-band spectra of BL Lac objects: millimetre observations of an X-ray-selected sampleen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Astronomy and Mathematics
dcterms.dateAccepted1999
rioxxterms.versionofrecordhttps://doi.org/10.1046/j.1365-8711.1999.02575.x
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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