2019MNRAS.489.2792Z

Query : 2019MNRAS.489.2792Z

2019MNRAS.489.2792Z - Mon. Not. R. Astron. Soc., 489, 2792-2818 (2019/October-3)

A contribution of star-forming clumps and accreting satellites to the mass assembly of z ∼ 2 galaxies.

ZANELLA A., LE FLOC'H E., HARRISON C.M., DADDI E., BERNHARD E., GOBAT R., STRAZZULLO V., VALENTINO F., CIBINEL A., SANCHEZ ALMEIDA J., KOHANDEL M., FENSCH J., BEHRENDT M., BURKERT A., ONODERA M., BOURNAUD F. and SCHOLTZ J.

Abstract (from CDS):

We investigate the contribution of clumps and satellites to the galaxy mass assembly. We analysed spatially resolved HubbleSpace Telescope observations (imaging and slitless spectroscopy) of 53 star-forming galaxies at z ∼ 1-3. We created continuum and emission line maps and pinpointed residual 'blobs' detected after subtracting the galaxy disc. Those were separated into compact (unresolved) and extended (resolved) components. Extended components have sizes ∼2 kpc and comparable stellar mass and age as the galaxy discs, whereas the compact components are 1.5 dex less massive and 0.4 dex younger than the discs. Furthermore, the extended blobs are typically found at larger distances from the galaxy barycentre than the compact ones. Prompted by these observations and by the comparison with simulations, we suggest that compact blobs are in situ formed clumps, whereas the extended ones are accreting satellites. Clumps and satellites enclose, respectively, ∼20 per cent and <=80 per cent of the galaxy stellar mass, ∼30 per cent and ∼20 per cent of its star formation rate. Considering the compact blobs, we statistically estimated that massive clumps (M* >= 109 M☉) have lifetimes of ∼650 Myr, and the less massive ones (108 < M* < 109 M☉) of ∼145 Myr. This supports simulations predicting long-lived clumps (lifetime >= 100 Myr). Finally, <=30 per cent (13 per cent) of our sample galaxies are undergoing single (multiple) merger(s), they have a projected separation <=10 kpc, and the typical mass ratio of our satellites is 1:5 (but ranges between 1:10 and 1:1), in agreement with literature results for close pair galaxies.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: evolution - galaxies: interactions - galaxies: irregular - galaxies: ISM - galaxies: star formation - galaxies: structure

VizieR on-line data: <Available at CDS (J/MNRAS/489/2792): tabled1.dat tabled2.dat>

Nomenclature: Table D1: [ZLH2019] NNN N=53 among (Nos 107-915).

Simbad objects: 53

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Number of rows : 53
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ClG J1449+0856 ClG 14 49.0 +08 56           ~ 70 0
2 [GSD2013b] 631 G 14 49 11.2743 +08 56 24.985           ~ 2 0
3 [GSD2013b] 599 G 14 49 11.4111 +08 56 21.634           ~ 2 0
4 [GSD2013b] 422 G 14 49 11.6203 +08 56 00.407           ~ 4 0
5 [ZLH2019] 385 G 14 49 11.85553 +08 55 56.2856           ~ 1 0
6 [ZLH2019] 383 G 14 49 11.96018 +08 55 55.8245           ~ 1 0
7 [GSD2013b] 510 G 14 49 11.9757 +08 56 12.744           ~ 4 0
8 [ZLH2019] 434 G 14 49 12.05022 +08 56 00.5042           ~ 1 0
9 [ZLH2019] 177 G 14 49 12.19147 +08 56 33.5923           ~ 1 0
10 [ZLH2019] 178 G 14 49 12.41219 +08 55 28.4030           ~ 1 0
11 [ZLH2019] 261 G 14 49 12.52730 +08 55 39.9211           ~ 1 0
12 [GSD2013b] 568 G 14 49 12.6201 +08 56 19.235           ~ 4 0
13 [ZLH2019] 151 G 14 49 12.78572 +08 55 25.0796           ~ 1 0
14 [ZLH2019] 162 G 14 49 13.21214 +08 55 26.4035           ~ 1 0
15 [ZLH2019] 680 G 14 49 13.44746 +08 56 33.7095           ~ 1 0
16 [ZLH2019] 761 G 14 49 13.48381 +08 56 44.8575           ~ 1 0
17 [ZLH2019] 293 G 14 49 13.50076 +08 55 39.7278           ~ 1 0
18 [ZLH2019] 256 G 14 49 13.71555 +08 55 37.8061           ~ 1 0
19 [GSD2013b] 580 G 14 49 13.7267 +08 56 23.058           ~ 4 0
20 [GSD2013b] 709 G 14 49 14.1372 +08 56 36.096           ~ 3 0
21 [ZLH2019] 395 G 14 49 14.15996 +08 55 55.7303           ~ 1 0
22 [ZLH2019] 691 G 14 49 14.17034 +08 56 34.7848           ~ 1 0
23 [ZLH2019] 365 G 14 49 14.47414 +08 55 51.0639           ~ 1 0
24 [GDO2011] 5113 G 14 49 14.4943 +08 56 23.157           ~ 4 0
25 [ZLH2019] 497 G 14 49 14.55088 +08 55 46.8943           ~ 1 0
26 [ZLH2019] 804 G 14 49 14.70461 +08 56 46.3159           ~ 1 0
27 [ZLH2019] 883 G 14 49 15.46085 +08 57 03.1991           ~ 1 0
28 [ZLH2019] 214 G 14 49 15.52005 +08 55 32.8551           ~ 1 0
29 [ZLH2019] 694 G 14 49 15.54944 +08 56 34.7984           ~ 1 0
30 [ZLH2019] 688 G 14 49 15.77653 +08 56 00.8777           ~ 1 0
31 [ZLH2019] 179 G 14 49 16.04557 +08 55 27.8519           ~ 1 0
32 [ZLH2019] 632 G 14 49 16.10524 +08 56 25.8975           ~ 1 0
33 [ZLH2019] 422 G 14 49 16.20863 +08 56 13.2804           ~ 1 0
34 [ZLH2019] 579 G 14 49 16.23156 +08 56 21.8813           ~ 1 0
35 [ZLH2019] 252 G 14 49 16.27231 +08 56 59.9540           ~ 1 0
36 [ZLH2019] 107 G 14 49 16.39746 +08 55 18.6003           ~ 1 0
37 [ZLH2019] 314 G 14 49 16.41797 +08 55 45.6756           ~ 1 0
38 [ZLH2019] 364 G 14 49 16.56673 +08 55 52.1750           ~ 1 0
39 [ZLH2019] 159 G 14 49 16.62227 +08 55 27.6436           ~ 1 0
40 [ZLH2019] 400 G 14 49 16.74423 +08 55 55.3026           ~ 1 0
41 [ZLH2019] 558 G 14 49 16.82154 +08 55 54.1478           ~ 1 0
42 [ZLH2019] 123 G 14 49 17.03763 +08 55 21.7947           ~ 1 0
43 [ZLH2019] 318 G 14 49 17.31584 +08 55 44.9801           ~ 1 0
44 [ZLH2019] 508 G 14 49 17.46803 +08 55 41.7804           ~ 1 0
45 [SGS2019] 850 25 G 14 49 17.69662 +08 56 54.9055           ~ 2 0
46 [GSD2013b] 843 G 14 49 17.8281 +08 57 08.928           ~ 2 0
47 [ZLH2019] 161 G 14 49 17.89828 +08 55 26.3231           ~ 1 0
48 [ZLH2019] 246 G 14 49 18.54964 +08 55 30.3575           ~ 1 0
49 [ZLH2019] 834 G 14 49 18.64329 +08 56 17.2900           ~ 1 0
50 [ZLH2019] 915 G 14 49 19.19740 +08 56 50.8757           ~ 1 0
51 [ZLH2019] 491 G 14 49 19.81650 +08 56 07.8849           ~ 1 0
52 [ZLH2019] 317 G 14 49 19.90453 +08 55 43.9615           ~ 1 0
53 [ZLH2019] 386 G 14 49 19.93887 +08 56 10.8507           ~ 1 0

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