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Extragalactic 1 millimeter sources: Simultaneous observations at centimeter, millimeter, and visual wavelengths

Landau, R. and Jones, T. W. and Epstein, E. E. and Neugebauer, G. and Soifer, B. T. and Werner, M. W. and Puschell, J. J. and Balonek, T. J. (1983) Extragalactic 1 millimeter sources: Simultaneous observations at centimeter, millimeter, and visual wavelengths. Astrophysical Journal, 268 (1). pp. 68-75. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:20140319-131640084

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Abstract

Observations simultaneously made at visual (B, V, and R) wavelengths, at 1, 1.4, and 3.4 mm and at 1.3, 2, 6, and 20 cm of 9 QSOs and BL Lac objects are reported. The range of the millimeter visual spectral index ɑ_(mv) was only 0.65-0.82, typical of optically thin synchrotron emission. This may indicate that the electrons radiating synchrotron emission in this portion of the spectrum are not subjected to large radiative losses, and therefore relativistic bulk motion with Doppler factors ~10 are required. The visual spectral index is much more broadly distributed and typically larger than ɑ_(mv). The spectral energy distributions have not changed much in the last 2-5 years except for 2251 + 15 and perhaps 0235 + 164. Only 1749 +09 shows a sharp spectral break shortward of 1 mm. Sixteen other sources were observed at 1 mm, of which seven were detected.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1086/160930DOIArticle
http://adsabs.harvard.edu/abs/1983ApJ...268...68LADSArticle
Additional Information:© 1983 American Astronomical Society. Received 1982 September 30; accepted 1982 October 27. We thank L. Rudnick for extensive discussion; W. Dent, E. Grossman, J. Kenney, W. Kinzel, R. Perley, J. Rodriguez, T. Roellig, and the staff of the NRAO Tucson facility for observing assistance; and Gary Grasdalen and Roger Hildebrand for attempting 10 ,urn and 400 ,urn observations. The work of E. E. E. was supported by U.S. Air Force contract no. F04701-82-C-0083. Observations at Palomar were supported by NASA. Work at Mount Lemmon and at the University of Minnesota is supported by NSF grants AST-80-15307 and AST-81-14737.
Funders:
Funding AgencyGrant Number
U. S. Air ForceF04701-82-C-0083
NASAUNSPECIFIED
NSFAST-80-15307
NSFAST-81-14737
Subject Keywords:BL Lacertae objects; infrared: sources; quasars; radiation mechanisms; radio sources: general
Record Number:CaltechAUTHORS:20140319-131640084
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20140319-131640084
Official Citation:Extragalactic 1 millimeter sources: Simultaneous observations at centimeter, millimeter, and visual wavelengths Landau, R., Jones, T. W., Epstein, E. E., Neugebauer, G., Soifer, B. T., Werner, M. W., , Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 268, May 1, 1983, p. 68-75.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:44395
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:19 Mar 2014 21:36
Last Modified:19 Mar 2014 21:36

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