2010A&A...513A..11O


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.14CEST21:23:32

2010A&A...513A..11O - Astronomy and Astrophysics, volume 513, A11-11 (2010/4-1)

Star-formation in the central kpc of the starburst/LINER galaxy NGC 1614.

OLSSON E., AALTO S., THOMASSON M. and BESWICK R.

Abstract (from CDS):

The aim is to investigate the star-formation and LINER (low ionization nuclear emission line region) activity within the central kiloparsec of the galaxy NGC1614. In this paper the radio continuum morphology, which provides a tracer of both nuclear and star-formation activity, and the distribution and dynamics of the cold molecular and atomic gas feeding this activity, are studied. In particular, the nature of an R≃300pc nuclear ring of star-formation and its relationship to the LINER activity in NGC1614 is addressed. A high angular resolution, multi-wavelength study of the LINER galaxy NGC1614 has been performed. Deep observations of the CO 1-0 spectral line were performed using the Owens Valley Radio Observatory (OVRO). These data have been complemented by extensive multi-frequency radio continuum and HI absorption observations using the Very Large Array (VLA) and Multi-Element Radio Linked Interferometer Network (MERLIN). Toward the center of NGC1614, we have detected a ring of radio continuum emission with a radius of 300pc. This ring is coincident with previous radio and Paα observations. The dynamical mass of the ring based on HI absorption is 3.1x109M. The peak of the integrated CO 1-0 emission is shifted by 1'' to the north-west of the ring center. An upper limit to the molecular gas mass in the ring region is ∼1.7x109M. Inside the ring, there is a north to south elongated 1.4GHz radio continuum feature, with a nuclear peak. This peak is also seen in the 5 GHz radio continuum and in the CO. We suggest that the R=300pc star forming ring represents the radius of a dynamical resonance - as an alternative to the scenario that the starburst is propagating outwards from the center into a molecular ring. The ring-like appearance is probably part of a spiral structure. Substantial amounts of molecular gas have passed the radius of the ring and reached the nuclear region. The nuclear peak seen in 5GHz radio continuum and CO is likely related to previous star formation, where all molecular gas was not consumed. The LINER-like optical spectrum observed in NGC 1614 may be due to nuclear starburst activity, and not to an active galactic nucleus (AGN). Although the presence of an AGN cannot be excluded.

Abstract Copyright:

Journal keyword(s): galaxies: evolution - galaxies: individual: NGC 1614 - galaxies: starburst - galaxies: active - ISM: molecules - ISM: atoms

Simbad objects: 10

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Number of rows : 10

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 NGC 278 H2G 00 52 04.3422973787 +47 33 01.649350749   10.5       ~ 219 1
2 QSO B0420-0127 QSO 04 23 15.80072776 -01 20 33.0654034   17.50 17.00 16.28   ~ 1054 3
3 NGC 1614 AGN 04 34 00.027 -08 34 44.57   14.66 13.99     ~ 601 0
4 ICRF J043837.8-084821 G 04 38 37.87652581 -08 48 21.5084773     20.0     ~ 9 1
5 7C 055201.39+394824.00 QSO 05 55 30.80561150 +39 48 49.1649664     18.0 17.5   ~ 466 2
6 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5336 6
7 NGC 3718 GiP 11 32 34.8527469396 +53 04 04.494313634   11.35 10.61     ~ 343 1
8 NGC 4194 AGN 12 14 09.615 +54 31 35.93   13.79 13.30     ~ 409 2
9 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3716 1
10 NGC 5218 GiP 13 32 10.4287653669 +62 46 04.126116981   13.1       ~ 144 1

    Equat.    Gal    SGal    Ecl

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2020.07.14-21:23:32

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