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Title:
Monitoring the Large Proper Motions of Radio Sources in the Orion BN/KL Region
Authors:
Gómez, Laura; Rodríguez, Luis F.; Loinard, Laurent; Lizano, Susana; Allen, Christine; Poveda, Arcadio; Menten, Karl M.
Affiliation:
AA(Centro de Radioastronomía y Astrofísica, UNAM, Apdo. Postal 3-72, Morelia, Michoacán, 58089 México , , , ; Currently at: Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany; .), AB(Centro de Radioastronomía y Astrofísica, UNAM, Apdo. Postal 3-72, Morelia, Michoacán, 58089 México , , , ), AC(Centro de Radioastronomía y Astrofísica, UNAM, Apdo. Postal 3-72, Morelia, Michoacán, 58089 México , , , ), AD(Centro de Radioastronomía y Astrofísica, UNAM, Apdo. Postal 3-72, Morelia, Michoacán, 58089 México , , , ), AE(Instituto de Astronomía, UNAM, Apdo. Postal 70-264, México, D. F., 04510 México , ), AF(Instituto de Astronomía, UNAM, Apdo. Postal 70-264, México, D. F., 04510 México , ), AG(Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany; )
Publication:
The Astrophysical Journal, Volume 685, Issue 1, pp. 333-343. (ApJ Homepage)
Publication Date:
09/2008
Origin:
UCP
ApJ Keywords:
Astrometry, ISM: Individual: Name: Orion, Radio Continuum: Stars, Stars: Flare, Stars: Pre-Main-Sequence
DOI:
10.1086/590229
Bibliographic Code:
2008ApJ...685..333G

Abstract

We present absolute astrometry of four radio sources in the Becklin-Neugebauer/Kleinman-Low (BN/KL) region, derived from archival data (taken in 1991, 1995, and 2000) as well as from new observations (taken in 2006). All data consist of 3.6 cm continuum emission and were taken with the Very Large Array in its highest angular resolution A configuration. We confirm the large proper motions of the BN object, the radio source I (GMR I), and the radio counterpart of the infrared source n (Orion-n), with values from 15 to 26 km s-1. The three sources are receding from a point between them from where they seem to have been ejected about 500 years ago, probably via the disintegration of a multiple stellar system. We present simulations of very compact stellar groups that provide a plausible dynamical scenario for the observations. The radio source Orion-n appeared as a double in the first three epochs, but as single in 2006. We discuss this morphological change. The fourth source in the region, GMR D, shows no statistically significant proper motions. We also present new, accurate relative astrometry between BN and radio source I that restrict possible dynamical scenarios for the region. During the 2006 observations, the radio source GMR A, located about 1' to the northwest of the BN/KL region, exhibited an increase in its flux density of a factor of ~3.5 over a timescale of 1 hr. This rapid variability at centimeter wavelengths is similar to that previously found during a flare at millimeter wavelengths that took place in 2003.
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