2019A&A...629A..12M

Query : 2019A&A...629A..12M

2019A&A...629A..12M - Astronomy and Astrophysics, volume 629A12-12 (2019/9-1)

Properties of extragalactic thick discs recovered from ultra-deep Stripe82 imaging.

MARTINEZ-LOMBILLA C. and KNAPEN J.H.

Abstract (from CDS):


Context. Thick discs can give invaluable information on the formation and evolution history of galaxies as most, if not all, disc galaxies have a thin (classical) disc and a thick disc.
Aims. We study the structure of thick discs in extraordinary depth by reaching a surface brightness limit of µrdeep∼28.5-29mag/arcsec2 with combined g, r, i band images from the IAC Stripe 82 Legacy Project.
Methods. We present the characterisation of the thick discs in a sample of five edge-on galaxies. A study of the radial and vertical surface brightness profiles is presented by comparing our data with point spread function (PSF) deconvolved models. Our method begins with an analysis of the background and masking processes. Then we consider the effects of the PSF through galaxy modelling. The galaxy disc components are fitted considering that the thin and thick discs are two stellar fluids that are gravitationally coupled in hydrostatic equilibrium.
Results. We find that effects due to the PSF are significant when low surface brightness is reached, especially in the vertical profiles, but it can be accounted for by careful modelling. The galaxy outskirts are strongly affected by the faint wings of the PSF, mainly by PSF-redistributed light from the thin disc. This is a central problem for ultra-deep imaging. The thick-disc component is required to reach satisfactory fit results in the more complex galaxies in our sample, although it is not required for all galaxies. When the PSF is ignored, the brightness of these structures may be overestimated by up to a factor of ∼4.
Conclusions. In general, our results are in good agreement with those of previous works, although we reach deeper surface brightness levels, so that the PSF effects are stronger. We obtain scale heights and mass ratios of thin and thick discs (zt, zT, and MT/Mt), which provide excellent agreement with previous studies. Our small initial sample provides evidence for aspects of a wide variety of formation theories for the thick discs in disc galaxies.

Abstract Copyright: © ESO 2019

Journal keyword(s): galaxies: formation - galaxies: evolution - galaxies: structure - methods: observational - methods: data analysis - techniques: image processing

Simbad objects: 58

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Number of rows : 58
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 Z 384-10 GiC 00 49 35.683 +01 06 55.72   14.99       ~ 65 1
2 2MASX J00555593+0039403 GiC 00 55 55.9414675080 +00 39 40.312902132           ~ 8 0
3 MCG+00-03-064 GiC 01 03 38.822 -00 29 27.39   16.0       ~ 26 0
4 LEDA 173375 EmG 01 04 41.546 -00 57 21.58   15.83   14.66   ~ 20 0
5 Z 385-16 EmG 01 10 38.2668831072 -00 16 40.951021620   15.6       ~ 35 0
6 NGC 429 EmG 01 12 57.4281188424 -00 20 42.011992896   14.4       ~ 67 0
7 MCG+00-04-078 LSB 01 19 04.472 -00 08 19.08   16.5       ~ 43 0
8 Z 385-72 GiC 01 20 06.803 -00 12 19.61   15.5   14.97 15.0 ~ 47 0
9 Z 385-94 H2G 01 23 14.61 -00 42 02.3   15.7       ~ 46 0
10 UGC 961 EmG 01 24 38.090 -00 03 46.45   16.0       ~ 26 0
11 Z 459-57 Sy1 01 27 32.5217343720 +19 10 43.839069600   14.89 14.22     ~ 333 0
12 Z 385-146 GiG 01 27 35.9000659872 -01 06 18.372774204   14.85       ~ 45 1
13 NGC 585 LIN 01 31 42.0986134608 -00 55 58.680941628   14.4       ~ 72 0
14 Z 386-7 Sy2 01 33 34.545 -01 05 25.94   15.2       ~ 45 0
15 Z 386-10 GiC 01 34 02.4430142040 -01 04 32.872210392   14.9       ~ 62 0
16 Z 386-11 LIN 01 34 07.9726085856 -01 01 56.248315716   14.4       ~ 68 0
17 Z 386-41 GiC 01 50 07.095 -00 44 24.81   15.5       ~ 27 0
18 IC 1756 EmG 01 57 05.249 -00 28 05.30   15.5       ~ 47 0
19 Z 387-32 EmG 02 05 40.2975857568 -00 41 41.619464772   15.7       ~ 39 0
20 Z 388-6 AG? 02 22 30.151 -00 37 01.33   16.10   14.43 14.7 ~ 55 0
21 MCG+00-07-014 G 02 26 36.599 +00 38 55.50   21.26   19.77 19.22 ~ 28 0
22 Z 388-19 G 02 27 51.4426399296 +00 30 05.494879368   15.5       ~ 57 0
23 Z 483-64 GiG 02 28 17.5928014128 +26 18 44.809322148   14.9       ~ 33 0
24 NGC 955 EmG 02 30 33.1410630408 -01 06 30.307542912 13.29 12.93 11.97 13.0 12.4 ~ 112 1
25 NGC 1032 AG? 02 39 23.6373 +01 05 37.652   13.2       ~ 102 1
26 UGC 2177 LSB 02 42 06.277 -00 53 36.04   16.0       ~ 16 0
27 LEDA 3107779 EmG 02 48 34.388 -00 59 35.98   16.39   15.27   ~ 24 0
28 Z 389-29 EmG 02 49 53.568 -01 00 13.07   15.6       ~ 49 0
29 UGC 2404 AG? 02 55 48.875 +01 04 45.12   16.5 16.5     ~ 40 0
30 MCG+00-08-082 G 03 04 36.5644023528 -00 02 14.688769416   15.5       ~ 28 0
31 MCG+00-08-083 LIN 03 04 57.0710396400 +00 13 00.524434080   16.0       ~ 25 0
32 Z 389-75 G 03 05 09.034 +01 05 36.54   15.3       ~ 40 0
33 MCG+00-09-009 Sy2 03 09 00.6189736920 -00 58 56.263886004   15   14.89   ~ 15 0
34 UGC 2584 G 03 11 44.750 +01 02 41.27   18       ~ 18 0
35 MCG+00-09-021 LIN 03 11 59.860 -01 09 41.98   16.0       ~ 38 0
36 Z 390-41 GiG 03 16 31.8445225944 -00 28 05.163516552   14.9       ~ 58 0
37 Z 390-46 GiG 03 17 26.5002535296 -00 05 39.123109680   15.7       ~ 31 0
38 LEDA 1149944 G 03 21 33.929 -00 10 42.12   16.35   14.99   ~ 31 0
39 UGC 2699 G 03 22 00.979 -01 03 14.15   16.5       ~ 45 0
40 Z 390-82 G 03 24 06.5003660520 -01 03 28.252068768   15.7       ~ 38 0
41 IC 330 GiP 03 32 08.0298403992 +00 21 12.226599000   15.0       ~ 24 0
42 LEDA 92868 G 03 34 44.612 +00 17 50.43   16.12       ~ 16 0
43 Z 373-50 AGN 20 40 52.099 +00 39 10.09   15.52       ~ 73 1
44 Z 374-19 EmG 20 47 59.937 -00 10 48.14   15.0       ~ 33 0
45 Z 374-22 GiG 20 53 24.6368237568 +00 39 07.508717532   15.5       ~ 37 0
46 Z 374-42 AG? 21 04 51.9628659960 +00 26 52.684989612   15.5       ~ 21 0
47 LEDA 1157026 G 21 06 14.0459180448 +00 05 52.013661252           ~ 28 0
48 Z 375-28 EmG 21 20 38.266 +01 02 50.20   15.3       ~ 39 0
49 Z 377-8 G 21 58 07.332 +01 00 31.95   15.16   14.0 14.1 ~ 76 1
50 LEDA 191337 LIN 22 05 27.0080077560 -00 32 00.400911612   16.21   14.66   ~ 34 0
51 Z 377-45 EmG 22 18 52.962 -01 03 31.21   15.70       ~ 58 0
52 LEDA 3333282 G 22 31 49.797 +00 26 49.57           ~ 10 0
53 Z 379-5 AG? 22 47 04.196 -00 04 27.28   15.5       ~ 30 0
54 Z 379-29 Sy2 23 05 18.8343677808 +00 11 22.154765712   16.06 15.03     ~ 94 0
55 LEDA 91784 G 23 13 02.99 -01 14 33.8           ~ 11 0
56 NGC 7648 GiG 23 23 54.031 +09 40 02.85   13.5       ~ 87 1
57 Z 381-59 LIN 23 53 49.2477478536 -00 58 28.072674444   15.2       ~ 29 0
58 Z 382-9 Sy2 23 57 43.7283528648 +00 39 18.537401448   17.96 17.24     ~ 35 0

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