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dc.contributor.authorLy, C.
dc.contributor.authorWalker, R. C.
dc.contributor.authorWrobel, J. M.
dc.date.accessioned2019-11-08T22:49:38Z
dc.date.available2019-11-08T22:49:38Z
dc.date.issued2004-01
dc.identifier.citationC. Ly et al 2004 AJ 127 119en_US
dc.identifier.issn0004-6256
dc.identifier.doi10.1086/379855
dc.identifier.urihttp://hdl.handle.net/10150/635165
dc.description.abstractNRAO Very Long Baseline Array (VLBA) observations of NGC 4278, NGC 4374 (M84), NGC 6166, and M87 (NGC 4486) have been made at 43 GHz in an effort to image the jet collimation region. This is the first attempt to image the first three sources at 43 GHz using very long baseline interferometry (VLBI) techniques. These three sources were chosen because their estimated black hole mass and distance implied a Schwarzschild radius with large angular size, giving hope that the jet collimation regions could be studied. Phase referencing was utilized for the three sources because of their expected low flux densities. M87 was chosen as the calibrator for NGC 4374 because it satisfied the phase-referencing requirements: near the source and sufficiently strong. Having observed M87 for a long integration time, we have detected its subparsec jet, allowing us to confirm previous high-resolution observations made by Junor, Biretta, & Livio, who have indicated that a wide opening angle was seen near the base of the jet. Phase referencing successfully improved our image sensitivity, yielding detections and providing accurate positions for NGC 4278, NGC 4374, and NGC 6166. These sources are point dominated but show suggestions of extended structure in the direction of the large-scale jets. However, higher sensitivity will be required to study their subparsec jet structure.en_US
dc.language.isoenen_US
dc.publisherIOP Publishingen_US
dc.rights© 2004. The American Astronomical Society. All rights reserved. Printed in U.S.A.en_US
dc.subjectgalaxies: activeen_US
dc.subjectgalaxies: elliptical and lenticular, cDen_US
dc.subjectgalaxies: individual (NGC 4278, NGC 4374, NGC 4486, NGC 6166)en_US
dc.subjectgalaxies: jetsen_US
dc.subjectradio continuum: galaxiesen_US
dc.titleAn Attempt to Probe the Radio Jet Collimation Regions in NGC 4278, NGC 4374 (M84), and NGC 6166en_US
dc.typeArticleen_US
dc.identifier.eissn1538-3881
dc.contributor.departmentUniv Arizona, Steward Observen_US
dc.identifier.journalAstronomical Journalen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.volume127
dc.source.issue1
dc.source.beginpage119-124
refterms.dateFOA2019-11-08T22:49:39Z


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