2005A&A...444..791B


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.27CET00:12:45

2005A&A...444..791B - Astronomy and Astrophysics, volume 444, 791-801 (2005/12-4)

Sub-arcsecond imaging of the radio continuum and neutral hydrogen in the Medusa merger.

BESWICK R.J., AALTO S., PEDLAR A. and HUETTEMEISTER S.

Abstract (from CDS):

We present sub-arcsecond, Multi-Element Radio Linked Interferometer (MERLIN) observations of the decimetre radio continuum structure and neutral hydrogen (Hi) absorption from the nuclear region of the starburst galaxy NGC4194 (the Medusa Merger). The continuum structure of the central kiloparsec of the Medusa has been imaged, revealing a pair of compact radio components surrounded by more diffuse, weak radio emission. Using the constraints provided by these observations and those within the literature we conclude that the majority of this radio emission is related to the ongoing star-formation in this merger system. With these observations we also trace deep HI absorption across the detected radio continuum structure. The absorbing HI gas structure exhibits large variations in column densities. The largest column densities are found toward the south of the nuclear radio continuum, co-spatial with both a nuclear dust lane and peaks in 12CO(1->0) emission. The dynamics of the HI absorption, which are consistent with lower resolution 12CO emission observations, trace a shallow north-south velocity gradient of ∼320km/s/kpc. This gradient is interpreted as part of a rotating gas structure within the nuclear region. The HI and CO velocity structure, in conjunction with the observed gas column densities and distribution, is further discussed in the context of the fuelling and gas physics of the ongoing starburst within the centre of this merger.

Abstract Copyright:

Journal keyword(s): galaxies: individual: NGC 4194 - radio lines: galaxies - ISM: kinematics and dynamics - galaxies: ISM - galaxies: starburst - radio lines: ISM

Simbad objects: 8

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Number of rows : 8

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 PN A66 21 PN 07 29 02.7094421237 +13 14 48.589321539   15.67 15.99     DOZ 181 0
2 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5422 6
3 NVSS J120827+541319 Rad 12 08 27.4997211 +54 13 19.517841           ~ 20 1
4 NGC 4194 AGN 12 14 09.615 +54 31 35.93   13.79 13.30     ~ 419 2
5 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3839 2
6 QSO B1404+286 BLL 14 07 00.3933203928 +28 27 14.695133019   16.13 15.35 10.29   ~ 692 2
7 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2725 4
8 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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2021.02.27-00:12:45

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