The Cygnus X region XXIII. Is 18P87 galactic or extragalactic?

Details The Cygnus X region XXIII. Is 18P87 galactic or extragalactic? The Cygnus X region XXIII. Is 18P87 galactic or extragalactic?

2010-04-14

arxiv.org/abs/1004.2473v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Accepted for publication in Astronomische Nachrichten

Scientific paper

The radio source 18P87, previously thought to be a point source, has been serendipitously found to be resolved into a core-jet geometry in VLA maps. HI absorption of continuum emission (in data from the Canadian Galactic Plane Survey) appears in gas with radial velocities > +2 km/s but not in brightly emitting gas at lower radial velocity. Examination of further archival observations at radio, infrared and optical wavelengths suggests that the "obvious" interpretation as a radio galaxy requires a rather unusual object of this kind and a highly unusual local line of sight. We argue that 18P87 may be a Galactic object, a local astrophysical jet. If this is correct it could have arisen from outbursts of a microquasar.

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