2013A&A...549A..51F


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.24CET23:02:36

2013A&A...549A..51F - Astronomy and Astrophysics, volume 549A, 51-51 (2013/1-1)

NGC 6240: extended CO structures and their association with shocked gas.

FERUGLIO C., FIORE F., MAIOLINO R., PICONCELLI E., AUSSEL H., ELBAZ D., LE FLOC'H E., STURM E., DAVIES R. and CICONE C.

Abstract (from CDS):

We present deep CO(1-0) observations of NGC6240 performed with the IRAM Plateau de Bure Interferometer (PdBI). NGC6240 is the prototypical example of a major galaxy merger in progress, caught at an early stage, with an extended, strongly-disturbed butterfly-like morphology and a heavily obscured active nucleus in the core of each progenitor galaxy. The CO line shows a skewed profile with very broad and asymmetric wings detected out to velocities of -600km/s and +800km/s with respect to the systemic velocity. The PdBI maps reveal two prominent structures of blueshifted CO emission. One extends eastward, i.e. approximately perpendicular to the line connecting the galactic nuclei, on scales of ∼7kpc, and it shows velocities up to -400km/s. The other extends southwestward out to ∼7kpc from the nuclear region, and has a velocity of -100km/s with respect to the systemic one. Interestingly, redshifted emission with velocities 400 to 800km/s is detected around the two nuclei, extending in the east-west direction, and partly overlapping with the eastern blueshifted structure, although tracing a more compact region of size ∼1.7kpc. The overlap between the southwestern CO blob and the dust lanes seen in HST images, which are interpreted as tidal tails, indicates that the molecular gas is deeply affected by galaxy interactions. The eastern blueshifted CO emission is cospatial with an Hα filament that is associated with strong H2 and soft X-ray emission. The analysis of Chandra X-ray data provides strong evidence of shocked gas at the position of the Hα emission. Its association with outflowing molecular gas supports a scenario where the molecular gas is compressed into a shock wave that propagates eastward from the nuclei. If this is an outflow, the active galactic nuclei are very likely the driving force.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: interactions - galaxies: evolution - galaxies: ISM - quasars: general

VizieR on-line data: <Available at CDS (J/A+A/549/A51): table1.dat>

Simbad objects: 6

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Number of rows : 6

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 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5421 6
2 3C 273 BLL 12 29 06.6996828061 +02 03 08.598846466   13.05 14.830 14.11   ~ 5404 1
3 3C 279 Bla 12 56 11.1664521013 -05 47 21.531840471   18.01 17.75 15.87   ~ 2751 2
4 Mrk 231 Sy1 12 56 14.2340989340 +56 52 25.238555193   14.68 13.84     ~ 1815 3
5 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2724 4
6 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1509 2

    Equat.    Gal    SGal    Ecl

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2021.02.24-23:02:36

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