Proper Motions of the Radio Source Orion MR, Formerly Known as Orion n, and New Sources with Large Proper Motions in Orion BN/KL
Por:
Rodriguez, Luis F., Dzib, Sergio A., Zapata, Luis, Lizano, Susana, Loinard, Laurent, Menten, Karl M., Gomez, Laura
Publicada:
1 abr 2020
Resumen:
The infrared source known as Orion n was detected in 1980. About two
decades later, sensitive observations made with the Very Large Array
(VLA) revealed the presence of a spatially coincident millijansky double
source that appeared to be its radio counterpart. However, over the
years it has been concluded that the radio source shows large proper
motions to the south while the infrared source n is stationary. Here we
reanalyze the proper motions of the radio source adding both older and
newer VLA observations than previously used. We confirm the proper
motions of the double radio source that at present no longer coincides
positionally with the infrared source. We propose that the infrared
source is stationary while the radio source is moving as a result of the
explosion that took place in this region some 500 yr ago. Considering
the paper where it was first reported, we refer to this double radio
source as Orion MR. Additionally, we use these new observations to fully
confirm the large proper motions of the sources IRc23 and Zapata 11.
Together with sources BN, I, Orion MR, and x, there are at least six
compact sources that recede from a common point in Orion BN/KL. However,
IRc23 is peculiar in that its ejection age appears to be only 300 yr.
The relatively large number of sources rules out as a possible mechanism
the classic three-body scenario since then only two escaping bodies are
expected: a tight binary plus the third star involved in the encounter.
Filiaciones:
Univ Nacl Autonoma Mexico, Inst Radioastron & Astrofis, Apdo Postal 3-72 Xangari, Morelia 58089, Michoacan, Mexico
Univ Autonoma Chiapas, Mesoamer Ctr Theoret Phys, Carretera Emiliano Zapata Km 4, Gutierrez 29050, Chiapas, Mexico
Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany
Univ Nacl Autonoma Mexico, Inst Astron, Apartado Postal 70-264, Cdmx 04510, Mexico
Joint ALMA Observ, Alonso de Cordova 3107, Santiago, Chile
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