Extreme Brightness Temperatures and Refractive Substructure in 3C 273 with RadioAstron

DSpace/Manakin Repository

Extreme Brightness Temperatures and Refractive Substructure in 3C 273 with RadioAstron

Citable link to this page

 

 
Title: Extreme Brightness Temperatures and Refractive Substructure in 3C 273 with RadioAstron
Author: Johnson, Michael D.; Kovalev, Yuri Y.; Gwinn, Carl R.; Gurvits, Leonid I.; Narayan, Ramesh; Macquart, Jean-Pierre; Jauncey, David L.; Voitsik, Peter A.; Anderson, James M.; Sokolovsky, Kirill V.; Lisakov, Mikhail M.

Note: Order does not necessarily reflect citation order of authors.

Citation: Johnson, Michael D., Yuri Y. Kovalev, Carl R. Gwinn, Leonid I. Gurvits, Ramesh Narayan, Jean-Pierre Macquart, David L. Jauncey, et al. 2016. “Extreme Brightness Temperatures and Refractive Substructure in 3C 273 with RadioAstron.” The Astrophysical Journal 820 (1) (March 16): L10. doi:10.3847/2041-8205/820/1/l10.
Full Text & Related Files:
Abstract: Earth–space interferometry with RadioAstron provides the highest direct angular resolution ever achieved in astronomy at any wavelength. RadioAstron detections of the classic quasar 3C 273 on interferometric baselines up to 171 000 km suggest brightness temperatures exceeding expected limits from the “inverse-Compton catastrophe” by two orders of magnitude. We show that at 18 cm, these estimates most probably arise from refractive substructure introduced by scattering in the interstellar medium. We use the scattering properties to estimate an intrinsic brightness temperature of 7×1012 K, which is consistent with expected theoretical limits, but which is ∼15 times lower than estimates that neglect substructure. At 6.2 cm, the substructure influences the measured values appreciably but gives an estimated brightness temperature that is comparable to models that do not account for the substructure. At 1.35 cm, the substructure does not affect the extremely high inferred brightness temperatures, in excess of 1013 K. We also demonstrate that for a source having a Gaussian surface brightness profile, a single long-baseline estimate of refractive substructure determines an absolute minimum brightness temperature, if the scattering properties along a given line of sight are known, and that this minimum accurately approximates the apparent brightness temperature over a wide range of total flux densities.
Published Version: doi:10.3847/2041-8205/820/1/L10
Other Sources: http://arxiv.org/abs/1601.05810
Terms of Use: This article is made available under the terms and conditions applicable to Open Access Policy Articles, as set forth at http://nrs.harvard.edu/urn-3:HUL.InstRepos:dash.current.terms-of-use#OAP
Citable link to this page: http://nrs.harvard.edu/urn-3:HUL.InstRepos:27770117
Downloads of this work:

Show full Dublin Core record

This item appears in the following Collection(s)

 
 

Search DASH


Advanced Search
 
 

Submitters