2005A&A...429..469O


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.07CET04:37:51

2005A&A...429..469O - Astronomy and Astrophysics, volume 429, 469-475 (2005/1-2)

Anomalous HI kinematics in Centaurus A: Evidence for jet-induced star formation.

OOSTERLOO T.A. and MORGANTI R.

Abstract (from CDS):

We present new 21-cm HI observations performed with the ATCA of the large HI filament located about 15kpc NE from the centre of Centaurus A and discovered by Schiminovich et al. (1994ApJ...423L.101S). This HI cloud is situated (in projection) near the radio jet of Centaurus A, as well as near a large filament of ionised gas of high excitation and turbulent velocities and near regions with young stars. The higher velocity and spatial resolution of the new data reveals that, apart from the smooth velocity gradient corresponding to the overall rotation of the cloud around Centaurus A, HI with anomalous velocities of about 100km/s is present at the southern tip of this cloud. This is interpreted as evidence for an ongoing interaction between the radio jet and the HI cloud. Gas stripped from the HI cloud gives rise to the large filament of ionised gas and the star formation regions that are found downstream from the location of the interaction. The implied flow velocities are very similar to the observed anomalous HI velocities. Given the amount of HI with anomalous kinematics and the current star formation rate, the efficiency of jet-induced star formation is at most of the order of a percent.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: Centaurus A - galaxies: ISM

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 4C 41.17 rG 06 50 52.098 +41 30 30.53           ~ 317 1
2 PKS 1315-46 Rad 13 18 29.90 -46 20 34.0           ~ 16 1
3 2MASX J13211781+4235153 Sy2 13 21 17.813 +42 35 15.38   16.86 16.23     ~ 258 0
4 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4077 3
5 NAME Cen A NE HI Cloud HI 13 26 18.9 -42 49 32           ~ 4 0
6 ICRF J193925.0-634245 Sy2 19 39 25.02671 -63 42 45.6255   18.87 18.37 17.64   ~ 995 1
7 NAME Cen A Jet PoG ~ ~           ~ 47 0

    Equat.    Gal    SGal    Ecl

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2021.03.07-04:37:51

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