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题名: RESOLVING THE INNER JET STRUCTURE OF 1924-292 WITH THE EVENT HORIZON TELESCOPE
作者: Lu, Ru-Sen1; Fish, Vincent L.1; Weintroub, Jonathan2; Doeleman, Sheperd S.1; Bower, Geoffrey C.3; Freund, Robert4; Friberg, Per; Ho, Paul T. P.5, 6; Honma, Mareki7, 8; Inoue, Makoto6; Krichbaum, Thomas P.9; Marrone, Daniel P.4; Moran, James M.2; Oyama, Tomoaki7; Plambeck, Richard3; Primiani, Rurik2; Shen, Zhi-Qiang10, 11; Tilanus, Remo P. J.5, 12; Wright, Melvyn3; Young, Ken H.2; Ziurys, Lucy M.4; Zensus, J. Anton9
刊名: ASTROPHYSICAL JOURNAL LETTERS
出版日期: 2012-09-20
卷号: 757, 期号:1
关键词: galaxies: active ; galaxies: jets ; quasars: individual (1924-292) ; radio continuum: general ; techniques: high angular resolution ; techniques: interferometric
DOI: 10.1088/2041-8205/757/1/L14
文章类型: Article
英文摘要: 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 degrees. 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 similar to 80 degrees with respect to the centimeter jet. The size of the compact core is 0.15 pc with a brightness temperature of 1.2 x 10(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.
WOS标题词: Science & Technology ; Physical Sciences
类目[WOS]: Astronomy & Astrophysics
研究领域[WOS]: Astronomy & Astrophysics
关键词[WOS]: ACTIVE GALACTIC NUCLEI ; COMPACT RADIO-SOURCES ; SAGITTARIUS A-ASTERISK ; GHZ VLBI SURVEY ; BRIGHTNESS TEMPERATURES ; SPECTRA ; CATALOG
收录类别: SCI
语种: 英语
WOS记录号: WOS:000308916900014
Citation statistics:
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/15544
Appears in Collections:暗物质和空间天文实验室_期刊论文

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作者单位: 1.MIT, Haystack Observ, Westford, MA 01886 USA
2.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
3.Univ Calif Berkeley, Radio Astron Lab, Dept Astron, Berkeley, CA 94720 USA
4.Univ Arizona, Steward Observ, Arizona Radio Observ, Tucson, AZ 85721 USA
5.Joint Astron Ctr, James Clerk Maxwell Telescope, Hilo, HI 96720 USA
6.Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan
7.Natl Inst Nat Sci, Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan
8.Grad Univ Adv Studies, Mitaka, Tokyo 1818588, Japan
9.Max Planck Inst Radioastron, D-53121 Bonn, Germany
10.Chinese Acad Sci, Shanghai Astron Observ, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
11.Chinese Acad Sci, Key Lab Radio Astron, Shanghai 200030, Peoples R China
12.Netherlands Org Sci Res, NL-2509 AC The Hague, Netherlands
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