2020A&A...634A.124B


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET12:11:27

2020A&A...634A.124B - Astronomy and Astrophysics, volume 634A, 124-124 (2020/2-1)

The strange case of the peculiar spiral galaxy NGC 5474. New pieces of a galactic puzzle.

BELLAZZINI M., ANNIBALI F., TOSI M., MUCCIARELLI A., CIGNONI M., BECCARI G., NIPOTI C. and PASCALE R.

Abstract (from CDS):

We present the first analysis of the stellar content of the structures and substructures identified in the peculiar star-forming galaxy NGC 5474, based on Hubble Space Telescope resolved photometry from the LEGUS survey. NGC 5474 is a satellite of the giant spiral M 101, and it is known to have a prominent bulge that is significantly off-set from the kinematic centre of the underlying HI and stellar disc. The youngest stars (age≤100Myr) trace a flocculent spiral pattern extending out to ≥8kpc from the centre of the galaxy. On the other hand, intermediate-age (age≥500Myr) and old (age≥2Gyr) stars dominate the off-centred bulge and a large substructure residing in the south-western part of the disc (SW over-density) and they are not correlated with the spiral arms. The old age of the stars in the SW over-density suggests that this may be another signature of any dynamical interactions that have shaped this anomalous galaxy. We suggest that a fly by with M 101, generally invoked as the origin of the anomalies, may not be sufficient to explain all the observations. A more local and more recent interaction may help to put all the pieces of this galactic puzzle together.

Abstract Copyright: © ESO 2020

Journal keyword(s): galaxies: individual: NGC 5474 - galaxies: peculiar - galaxies: interactions - galaxies: stellar content - galaxies: structure

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 M 110 GiG 00 40 22.0544552438 +41 41 07.496294862   8.92 8.07     ~ 1222 1
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11104 1
3 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15064 1
4 NAME M101 Group GrG 14 03 +54.3           ~ 88 1
5 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2579 2
6 NGC 5474 GiP 14 05 01.608 +53 39 43.95   11.28 10.79     ~ 388 1
7 NGC 5477 G 14 05 33.318 +54 27 37.85 13.94 14.36 14.01     ~ 182 1

    Equat.    Gal    SGal    Ecl

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2020.12.03-12:11:27

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