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2012MNRAS.421.1603C - Mon. Not. R. Astron. Soc., 421, 1603-1623 (2012/April-1)
Triggered star formation in the inner filament of Centaurus A.
CROCKETT R.M., SHABALA S.S., KAVIRAJ S., ANTONUCCIO-DELOGU V., SILK J., MUTCHLER M., O'CONNELL R.W., REJKUBA M., WHITMORE B.C. and WINDHORST R.A.
Abstract (from CDS):
Based on the location and age of this stellar population, and the fact that there is no radio lobe or jet activity near the star formation, we propose an updated explanation for the origin of the inner filament. Sutherland et al. suggested that radio jet-induced shocks can drive the observed optical line emission. We argue that such shocks can naturally arise due to a weak cocoon-driven bow shock (rather than from the radio jet directly), propagating through the diffuse interstellar medium from a location near the inner northern radio lobe. The shock can overrun a molecular cloud, triggering star formation in the dense molecular cores. Ablation and shock heating of the diffuse gas then give rise to the observed optical line and X-ray emission. Deeper X-ray observations should show more diffuse emission along the filament.
Abstract Copyright: 2012 The Authors Monthly Notices of the Royal Astronomical Society2012 RAS
Journal keyword(s): galaxies: active - galaxies: elliptical and lenticular, cD - galaxies: individual: NGC 5128 - intergalactic medium - galaxies: jets - ultraviolet: galaxies
Nomenclature: Table A1: [CSK2012] NNN (Nos 1-111).
Simbad objects: 119