2017A&A...602A..97R


C.D.S. - SIMBAD4 rel 1.7 - 2021.05.18CEST04:50:42

2017A&A...602A..97R - Astronomy and Astrophysics, volume 602A, 97-97 (2017/6-1)

Investigating early-type galaxy evolution with a multiwavelength approach. II. The UV structure of 11 galaxies with Swift-UVOT.

RAMPAZZO R., MAZZEI P., MARINO A., USLENGHI M., TRINCHIERI G. and WOLTER A.

Abstract (from CDS):

Context. GALEX detected a significant fraction of early-type galaxies, in particular S0s, showing far-UV bright structures, sometimes involving an entire galaxy out to its outskirts. These features suggest the presence of either recent ongoing and/or prolonged star formation episodes, shedding new light on the evolution of these systems.
Aims. We aim at understanding the evolutionary path[s] of these early-type galaxies and the mechanisms at the origin of their UV-bright structures. We investigate with a multiwavelength approach the link between the inner and outer galaxy regions of a set of 11 early-type galaxies that were selected because of their nearly passive stage of evolution in the nuclear region.
Methods. This paper, second of a series, focuses on the information coming from the comparison between UV features detected by Swift-UVOT, which trace recent star formation, and the galaxy optical structure, which maps older stellar populations. We performed a surface photometric study of these early-type galaxies, observed with the Swift-UVOT UV filters W2 2030Å λ0, M2 2231Å λ0, W1 2634Å λ0 and the UBV bands. BVRI photometry from other sources in the literature was also used. Our integrated magnitude measurements were analyzed and compared with corresponding values in the literature. We characterize the overall galaxy structure that best fits the UV and optical luminosity profiles using a single Sersic law.
Results. The galaxies NGC 1366, NGC 1426, NGC 3818, NGC 3962, and NGC 7192 show featureless luminosity profiles. Excluding NGC 1366, which has a clear edge-on disk (n~=1-2), and NGC 3818, the remaining three galaxies have Sersic's indices n~=3-4 in the optical and a lower index in the UV. Bright ring- or arm-like structures are revealed by UV images and luminosity profiles of NGC 1415, NGC 1533, NGC 1543, NGC 2685, NGC 2974, and IC 2006. The ring- or arm-like structures differ from galaxy to galaxy. Sersic indices of UV profiles for these galaxies are in the range n=1.5-3 both in S0s and in galaxies classified as bona fide ellipticals, such as NGC 2974 and IC 2006. We note that in our sample optical Sersic indices are usually higher than in the UV indices. (M2-V) color profiles are bluer in ring- or arm-like structures than in the galaxy body.
Conclusions. The lower values of Sersic indices in the UV bands with respect to optical bands, suggesting the presence of a disk, point out that the role of the dissipation cannot be neglected in recent evolutionary phases of these early-type galaxies. - galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - ultraviolet: galaxies - galaxies: evolutio

Abstract Copyright: © ESO, 2017

Journal keyword(s):

VizieR on-line data: <Available at CDS (J/A+A/602/A97): clusters.dat table4.dat>

Simbad objects: 22

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Number of rows : 22

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 NGC 1209 GiP 03 06 03.020 -15 36 40.58   12   11.42   ~ 133 0
2 NAME FOR-ERI SUPERCL SCG 03 31 -32.3           ~ 11 0
3 NGC 1366 GiG 03 33 53.658 -31 11 38.78   12.94   11.49   ~ 88 0
4 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1612 0
5 NGC 1415 EmG 03 40 56.853 -22 33 52.07   12.47   11.08   ~ 107 0
6 NGC 1426 GiG 03 42 49.0995354501 -22 06 30.172682100   12.21 11.44 10.90   ~ 185 0
7 IC 2006 EmG 03 54 28.427 -35 58 01.75   12.39   10.94 11.9 ~ 196 0
8 NGC 1533 GiG 04 09 51.8352578260 -56 07 06.404418566   11.77 10.92 10.27 11.0 ~ 180 0
9 NGC 1543 EmG 04 12 43.1696030790 -57 44 16.338482645   10.67 10.60 9.74 10.7 ~ 129 0
10 NAME NGC 1566 Group GrG 04 20 00.6 -54 56 17           ~ 133 0
11 IC 2066 G 04 23 32.3161698536 -54 43 59.911955588   15.26   14.10   ~ 13 0
12 NGC 2685 Sy2 08 55 34.7056265191 +58 44 03.877798862   13.68 12.70     ~ 410 1
13 NGC 2974 Sy2 09 42 33.267 -03 41 56.82   12.19   10.77   ~ 416 0
14 NAME UMa Region reg 11 00 +50.0           ~ 318 0
15 NAME Leo B G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 761 0
16 NAME Crater Cluster GlC 11 36 16.20 -10 52 38.8           ~ 66 1
17 NGC 3818 GiG 11 41 57.3592664401 -06 09 20.448440482   13   11.78   ~ 171 0
18 NGC 3962 LIN 11 54 40.104 -13 58 29.95   13.16 12.16 11.15   ~ 145 0
19 NGC 4449 EmG 12 28 11.118 +44 05 36.81 10.11 9.98 9.64 9.45   ~ 1040 1
20 NAME Pavo Cluster ClG 20 18 14.2 -70 50 41           ~ 47 0
21 NGC 7192 GiG 22 06 50.178 -64 18 58.38   12.21 11.21 10.77   ~ 135 0
22 NAME Lynx Cloud Cld ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2021.05.18-04:50:42

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