MERLIN Radio Detection of an Interaction Zone within a Binary Orion Proplyd System | Zendy

M. F. Graham | Zendy; J. Meaburn | Zendy; S. T. Garrington | Zendy; T. J. O’Brien | Zendy; W. J. Henney | Zendy; C. R. O’dell | Zendy

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MERLIN Radio Detection of an Interaction Zone within a Binary Orion Proplyd System

Author(s) -

M. F. Graham,

J. Meaburn,

S. T. Garrington,

T. J. O’Brien,

W. J. Henney,

C. R. O’dell

Publication year - 2002

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/339398

Subject(s) - orion nebula , physics , astrophysics , ionization , line (geometry) , binary number , astronomy , stars , ion , geometry , mathematics , arithmetic , quantum mechanics

Presented here are high angular resolution MERLIN 5 GHz (6 cm) continuumobservations of the binary proplyd system, LV 1 in the Orion nebula, whichconsists of proplyd 168--326SE and its binary proplyd companion 168--326NW(separation 0.4 arcsec). Accurate astrometric alignment allows a detailedcomparison between these data and published HST PC Halpha and [Oiii] images. Thermal radio sources coincide with the two proplyds and originate in theionized photoevaporating flows seen in the optical emission lines. Flowvelocities of approx 50 km/s from the ionized proplyd surfaces and \geq 100km/s from a possible micro-jet have been detected using the Manchester Echellespectrometer. A third radio source is found to coincide with a region of extended, highexcitation, optical line emission that lies between the binary proplyds168--326SE/326NW . This is modelled as a bowshock due to the collision of thephotoevaporating flows from the two proplyds. Both a thermal and a non-thermalorigin for the radio emission in this collision zone are considered.Comment: 23 pages, 9 figures, accepted by Ap

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