2020A&A...633A..79K


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.28CET06:54:58

2020A&A...633A..79K - Astronomy and Astrophysics, volume 633A, 79-79 (2020/1-1)

NGC 6240: A triple nucleus system in the advanced or final state of merging.

KOLLATSCHNY W., WEILBACHER P.M., OCHMANN M.W., CHELOUCHE D., MONREAL-IBERO A., BACON R. and CONTINI T.

Abstract (from CDS):


Aims. NGC 6240 is a well-studied nearby galaxy system in the process of merging. Based on optical, X-ray, and radio observations, it is thought to harbor two active nuclei. We carried out a detailed optical 3D spectroscopic study to investigate the inner region of this system in connection with existing MERLIN and VLBA data.
Methods. We observed NGC 6240 with very high spatial resolution using the MUSE instrument in the Narrow-Field Mode with the four-laser GALACSI adaptive optics system on the ESO VLT under seeing conditions of 0.49". Our 3D spectra cover the wavelength range from 4725 to 9350Å at a spatial resolution of ∼75mas.
Results. We report the discovery of three nuclei in the final state of merging within a region of only 1 kpc in the NGC 6240 system. Thanks to MUSE we are able to show that the formerly unresolved southern component actually consists of two distinct nuclei separated by only 198 pc. In combination with Gaia data we reach an absolute positional accuracy of only 30 mas that is essential to compare optical spectra with MERLIN and VLBA radio positions.
Conclusions. The verification and detailed study of a system with three nuclei, two of which are active and each with a mass in excess of 9x107M, is of great importance for the understanding of hierarchical galaxy formation via merging processes since multiple mergers lead to a faster evolution of massive galaxies in comparison to binary mergers. So far it has been suggested that the formation of galactic nuclei with multiple supermassive black holes (SMBHs) is expected to be rare in the local universe. Triple massive black hole systems might be of fundamental importance for the coalescence of massive black hole binaries in less than a Hubble time leading to the loudest sources of gravitational waves in the millihertz regime.

Abstract Copyright: © ESO 2020

Journal keyword(s): galaxies: active - galaxies: interactions - instrumentation: high angular resolution - galaxies: individual: NGC 6240 - galaxies: nuclei

VizieR on-line data: <Available at CDS (J/A+A/633/A79): list.dat fits/*>

Status at CDS : Examining the need for a new acronym.

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Magellanic Stream HVC 00 32 -30.0           ~ 822 1
2 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 14993 1
3 UGC 4211 Sy2 08 04 46.362 +10 46 36.35   14.9       ~ 42 0
4 2MASS J10102294+1413007 Sy1 10 10 22.9574801799 +14 13 00.874885673   19.26 18.32     ~ 13 0
5 NGC 3758 Sy1 11 36 29.330 +21 35 45.44   14.8       ~ 144 0
6 NGC 5139 GlC 13 26 47.28 -47 28 46.1   6.12 5.33     ~ 3032 0
7 NGC 5256 PaG 13 38 17.8 +48 16 41   14.1 13.42     ~ 401 2
8 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2702 4
9 CD-38 10980 WD* 16 23 33.8384178546 -39 13 46.160032569 9.916 10.885 11.029 10.936 10.841 DA2 440 0
10 [CWB94] S Rad 16 52 58.84 +02 23 59.1           ~ 5 0
11 NGC 6240 Sy2 16 52 58.861 +02 24 03.55   14.31 13.37     ~ 1491 2
12 V* R Aqr Sy* 23 43 49.4629939776 -15 17 04.184232557   8.823 7.683 9.37   M6.5-8.5e 743 0
13 [CWB94] N Rad ~ ~           ~ 2 0

    Equat.    Gal    SGal    Ecl

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2020.10.28-06:54:58

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