RESOLVING THE INNER JET STRUCTURE OF 1924-292 WITH THE EVENT HORIZON TELESCOPE
Name
Lu-2012-RESOLVING THE INNER.pdf
Size
518.65 KB
Format
Adobe PDF
Checksum (MD5)
e0fb4dc2b3feadd7dbbc90a327b0872b
Author(s)
Fish, Vincent L.
Weintroub, Jonathan
Bower, Geoffrey C.
Freund, Robert
Friberg, Per
Ho, Paul T. P.
Honma, Mareki
Inoue, Makoto
Krichbaum, Thomas P.
Marrone, Daniel P.
Date Issued
September 2012
Journal
The Astrophysical Journal. Letters
Publisher
IOP Publishing
Citation
Lu, Ru-Sen, Vincent L. Fish, Jonathan Weintroub, Sheperd S. Doeleman, Geoffrey C. Bower, Robert Freund, Per Friberg, et al. “RESOLVING THE INNER JET STRUCTURE OF 1924-292 WITH THE EVENT HORIZON TELESCOPE.” The Astrophysical Journal 757, no. 1 (September 4, 2012): L14. © 2012 The American Astronomical Society
Version
Final published version
Abstract
We present the first 1.3 mm (230 GHz) very long baseline interferometry model image of an active galactic nucleus (AGN) jet using closure phase techniques with a four-element array. The model image of the quasar 1924-292 was obtained with four telescopes at three observatories: the James Clerk Maxwell Telescope on Mauna Kea in Hawaii, the Arizona Radio Observatory's Submillimeter Telescope in Arizona, and two telescopes of the Combined Array for Research in Millimeter-wave Astronomy in California in 2009 April. With the greatly improved resolution compared with previous observations and robust closure phase measurement, the inner jet structure of 1924-292 was spatially resolved. The inner jet extends to the northwest along a position angle of –53° at a distance of 0.38 mas from the tentatively identified core, in agreement with the inner jet structure inferred from lower frequencies, and making a position angle difference of ~80° with respect to the centimeter jet. The size of the compact core is 0.15 pc with a brightness temperature of 1.2 × 10[superscript 11] K. Compared with those measured at lower frequencies, the low brightness temperature may argue in favor of the decelerating jet model or particle-cascade models. The successful measurement of closure phase paves the way for imaging and time resolving Sgr A* and nearby AGNs with the Event Horizon Telescope.
MIT Department
Haystack Observatory
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1088/2041-8205/757/1/l14
