2015A&A...577A.106S

Query : 2015A&A...577A.106S

2015A&A...577A.106S - Astronomy and Astrophysics, volume 577A, 106-106 (2015/5-1)

The influence of diffuse scattered light. II. Observations of galaxy haloes and thick discs and hosts of blue compact galaxies.

SANDIN C.

Abstract (from CDS):

Studies of deep photometry of galaxies have presented discoveries of excess light in surface-brightness and colour profiles at large radii in the form of diffuse faint haloes and thick discs. In a majority of the cases, it has seemed necessary to use exotic stellar populations or alternative physical solutions to explain the excess. Few studies have carefully scrutinized the role of scattered light in this context. I explore the influence of scattered light on ground-based observations of haloes and thick discs around edge-on galaxies, haloes around face-on disc galaxies, host galaxies around blue compact galaxies (BCGs), and haloes around elliptical galaxies. Surface-brightness structures of all considered types of galaxies are modelled and analysed to compare scattered-light haloes and thick discs with measurements. I simulate the influence of scattered light and accurate sky subtraction on simplified Sersic-type and face-on disc galaxy models. All galaxy models are convolved with both lower-limit and brighter point spread functions (PSFs); for a few galaxies it was possible to use dedicated PSFs. The results show bright scattered-light haloes and high amounts of red excess at large radii and faint surface brightnesses for nearly all types of galaxies; exceptions are the largest elliptical-type galaxies where the influence of scattered light is smaller. Studies have underestimated the role of scattered light to explain their surface-brightness profiles. My analysis shows surface-brightness profiles that include scattered light that are very similar to and overlap measurements at all radii. The derivation of physical properties of haloes, thick discs, and BCG hosts from diffuse data is misleading since accurate and radially extended PSFs are non-existent. Significantly improved analyses that include new measurements of PSFs are required to study diffuse faint structures further.

Abstract Copyright: ∼

Journal keyword(s): methods: data analysis - methods: observational - galaxies: fundamental parameters - galaxies: halos - galaxies: structure - galaxies: photometry

Simbad objects: 68

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Number of rows : 68
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 ESO 350-38 Sy2 00 36 52.489 -33 33 17.23   14.31 14.41 13.49   ~ 378 0
2 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2154 2
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12659 1
4 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1669 2
5 LEDA 89526 GiC 02 32 41.80 +15 43 08.0   17.31       ~ 17 0
6 ESO 480-12 AG? 02 54 45.044 -25 06 37.25   14.85   14.38   ~ 25 0
7 ACO 407 ClG 03 01 43.7 +35 49 48           ~ 110 0
8 NAME Hubble Ultra Deep Field reg 03 32 39.0 -27 47 29           ~ 1669 0
9 ASPECS LP.3mm.06 QSO 03 32 39.883 -27 47 15.06 23.3163 23.0619 22.604 22.2729 21.765 ~ 58 0
10 EIS-DEEP CDFS-2 Ks 1 2223 EmG 03 32 42.283 -27 47 46.08 22.9979 22.8804 22.36 22.881 21.6176 ~ 54 0
11 Mrk 5 H2G 06 42 15.53 +75 37 32.6   17.0       ~ 111 0
12 NGC 2880 GiG 09 29 34.5699581472 +62 29 26.020090572   12.6       ~ 156 0
13 NGC 3115 GiG 10 05 13.9270507008 -07 43 06.982712292   11   9.37   ~ 1013 2
14 LEDA 91012 AG? 10 24 37.271 +11 54 28.97           ~ 26 0
15 NGC 3353 AGN 10 45 22.390 +55 57 37.36 12.90 13.25 12.79     ~ 359 1
16 M 105 LIN 10 47 49.600 +12 34 53.87   10.56 9.76 9.12 8.18 ~ 1464 0
17 NGC 3507 GiP 11 03 25.3619733360 +18 08 07.607343732   11.4       ~ 185 0
18 UGC 6594 GiC 11 37 36.852 +16 33 24.78   14.8       ~ 64 0
19 NGC 3957 Sy2 11 54 01.5349526640 -19 34 08.004900504   13.00   11.42   ~ 90 0
20 IC 745 AGN 11 54 12.2719925760 +00 08 11.823367524   14.59 14.19     ~ 133 1
21 NGC 4102 Sy2 12 06 23.0 +52 42 40   11.8       ~ 423 1
22 2MFGC 9543 GiG 12 08 20.3357976408 +13 41 02.508035280   15.3       ~ 42 0
23 Mrk 1313 Sy1 12 12 14.7430689744 +00 04 20.530354908   17.56 17.40     ~ 77 0
24 NGC 4244 GiG 12 17 29.659 +37 48 25.60   10.71   9.99   ~ 558 1
25 2dFGRS TGN385Z034 H2G 12 19 53.199 +01 46 24.13   15.2 14.80 15.213   ~ 48 0
26 M 84 Sy2 12 25 03.74333 +12 53 13.1393 12.67 12.09 10.49     ~ 1765 2
27 NGC 4387 GiG 12 25 41.6768484264 +12 48 37.804615956 13.42 13.01 12.12   10.87 ~ 392 1
28 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1084 1
29 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6652 0
30 NGC 4434 GiG 12 27 36.6771662112 +08 09 15.640206876   13.2       ~ 258 0
31 NGC 4458 GiP 12 28 57.5613938232 +13 14 30.946545276 13.27 12.93 12.07     ~ 413 2
32 NGC 4464 GiG 12 29 21.2937802368 +08 09 23.807609316   13.5       ~ 232 0
33 NGC 4467 GiG 12 29 30.2447376768 +07 59 34.273371336   15.2       ~ 179 0
34 LEDA 41180 AG? 12 29 34.9891966080 +08 03 28.781563608           ~ 84 0
35 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 646 1
36 NGC 4477 Sy2 12 30 02.1955766304 +13 38 11.543715888 11.98 11.38 10.42     ~ 397 2
37 NGC 4478 GiP 12 30 17.4160005576 +12 19 42.790577160 12.82 12.36 11.45   10.17 ~ 491 1
38 UGCA 283 GiG 12 30 31.985 +12 29 24.85   14.5       ~ 413 0
39 UGC 7658 GiG 12 30 57.7095721176 +12 16 13.316512872   11.2 11.59 12.02   ~ 232 1
40 NGC 4494 GiP 12 31 24.0391348536 +25 46 30.071664120   10.55 9.74     ~ 474 0
41 IC 3461 GiG 12 32 02.747 +11 53 23.16   15.4 14.88   13.3 ~ 127 0
42 IC 3470 GiP 12 32 23.353 +11 15 47.56   15.0       ~ 116 0
43 IC 798 GiG 12 32 33.4026417888 +15 24 55.432700280   15.3       ~ 99 0
44 NGC 4515 GiG 12 33 04.9652329656 +16 15 55.889535096   13.3       ~ 147 0
45 IC 3490 GiC 12 33 13.902 +10 55 42.73   15.6       ~ 79 0
46 IC 3509 GiG 12 34 11.5324571232 +12 02 56.163023196   15.3       ~ 114 0
47 NGC 4550 GiP 12 35 30.5913588048 +12 13 14.921166792 12.97 12.56 11.68     ~ 538 1
48 2MASX J12353723+1222554 GiP 12 35 37.2512550384 +12 22 55.234598772   15.41       ~ 94 0
49 NGC 4551 GiP 12 35 37.9542692328 +12 15 50.284593432 13.49 12.97 12.02     ~ 356 1
50 NGC 4565 LIN 12 36 20.804 +25 59 14.61   13.61 12.43     ~ 958 0
51 IC 3635 GiG 12 40 13.334 +12 52 29.98   15.5       ~ 82 0
52 IC 3653 GiG 12 41 15.7273825296 +11 23 13.997694300   14.7       ~ 114 0
53 IC 3672 GiG 12 42 08.6673855720 +11 45 15.438923748   15.1       ~ 111 0
54 M 60 GiP 12 43 39.9680 +11 33 09.696   10.3       ~ 1348 1
55 2dFGRS TGN327Z109 LSB 13 02 40.79 +01 04 26.8   18   16.818   ~ 35 0
56 6dFGS gJ131742.7-010005 LSB 13 17 43.1868710184 -01 00 03.820032216   16.0   15.7 16.2 ~ 44 0
57 ACO 2029 ClG 15 10 56.2 +05 44 42           ~ 943 0
58 NGC 5906 GiG 15 15 53.687 +56 19 43.86   11.4       ~ 769 1
59 Mrk 487 bCG 15 37 04.237 +55 15 47.60   15.2       ~ 133 0
60 NGC 6052 AG? 16 05 12.8715178104 +20 32 32.607297132 13.01 13.44 13.00     ~ 351 2
61 ESO 338-4 EmG 19 27 58.338 -41 34 30.81   13.55 13.21 13.14 13.43 ~ 237 1
62 ESO 400-43 bCG 20 37 41.931 -35 29 07.94   14.26 14.34 13.93 13.96 ~ 50 2
63 NGC 7280 GiP 22 26 27.5758899936 +16 08 53.421593496   13.6       ~ 159 0
64 IC 5249 AG? 22 47 06.262 -64 49 55.42   14.35   13.36 13.7 ~ 96 0
65 NGC 7468 bCG 23 02 59.172 +16 36 16.20   14.0       ~ 161 0
66 NGC 7647 BiC 23 23 57.4310112528 +16 46 38.141670936   14.61 14.45     ~ 76 0
67 NGC 7720 Sy1 23 38 29.38324020 +27 01 53.2580084   13.9 13.3     ~ 542 4
68 NGC 7728 BiC 23 40 00.83890 +27 08 01.3730   14.3       ~ 109 1

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