Show simple item record

dc.contributor.authorStocke, John T.
dc.contributor.authorDanforth, Charles W.
dc.contributor.authorPerlman, Eric S.
dc.date.accessioned2014-10-14T15:22:06Z
dc.date.available2014-10-14T15:22:06Z
dc.date.issued2011-04-25
dc.identifier.citationStocke, J. T., Danforth, C. W., & Perlman, E. S. (2011). Broad lya emission from three nearby BL lacertae objects. Astrophysical Journal, 732(2)en_US
dc.identifier.urihttp://hdl.handle.net/11141/343
dc.description.abstractWe present far-UV HST/COS spectra of four nearby BLLac objects. BLLac spectra are dominated by a smooth, power-law continuum which arises in a relativistic jet. However, the spectra are not necessarily featureless; weak, broad- and/or narrow-line emission is sometimes seen in high-quality optical spectra. We present detections of Lyα emission in HST/COS spectra of Mrk421 (z = 0.030) and PKS2005-489 (z = 0.071) as well as an archival HST/GHRS observation of Mrk501 (z = 0.0337). Archival HST/STIS observations of PKS2155-304 (z = 0.116) show no Lyα emission to a very low upper limit. Using the assumption that the broad-line region (BLR) clouds are symmetrically placed around the active galactic nucleus (AGN), we use these measured Lyα emission features to constrain either the relativistic Γ values for the ionizing continuum produced by the jet (in the ionization-bounded case) or the mass of warm gas (in the density-bounded case). While realistic Γ values can be obtained for all four cases, the values for Mrk421 and PKS2155-304 are high enough to suggest that covering factors of BLR clouds of ∼1%-2% might be required to provide consistency with earlier values of Doppler boosting and viewing angles suggested for this class of BL Lacs. This discrepancy also exists in the case of M87, where the amount of Doppler boosting in our direction is expected to be minimal, again suggestive of a small covering factor of BLR clouds. If, as these small covering factors might suggest, the assumptions of a density-bounded model could be more correct, then the observed Lyα luminosities require that BLLac/FR 1 nuclei possess very little warm gas (10-4 to 10-5 M⊙) as suggested by Guilbert etal. If these clouds are in pressure balance with a hotter (∼10 6 K) gas, the BLR contains too little mass to power the AGN by accretion alone.en_US
dc.language.isoen_USen_US
dc.rightsThis published article is available in accordance with the publisher's policy. It may be subject to U.S. Copyright Law.en_US
dc.rights.urihttp://aas.org/publications/aas-copyright-policyen_US
dc.titleBroad Lyα emission from three nearby BL Lacertae objectsen_US
dc.typeArticleen_US
dc.identifier.doi10.1088/0004-637X/732/2/113


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record