2020MNRAS.494.2600N


Query : 2020MNRAS.494.2600N

2020MNRAS.494.2600N - Mon. Not. R. Astron. Soc., 494, 2600-2617 (2020/May-2)

The Sheet of Giants: Unusual properties of the Milky Way's immediate neighbourhood.

NEUZIL M.K., MANSFIELD P. and KRAVTSOV A.V.

Abstract (from CDS):

We quantify the shape and overdensity of the galaxy distribution in the 'Local Sheet' within a sphere of R = 8 Mpc and compare these properties with the expectations of the ΛCDM model. We measure ellipsoidal axis ratios of c/a ≃ 0.16 and b/a ≃ 0.79, indicating that the distribution of galaxies in the Local Volume can be approximated by a flattened oblate ellipsoid, consistent with the 'sheet'-like configuration noted in previous studies. In contrast with previous estimates that the Local Sheet has a density close to average, we find that the number density of faint and bright galaxies in the Local Volume is ≃1.7 and ≃5.2 times denser, respectively, than the mean number density of galaxies of the same luminosity. Comparison with simulations shows that the number density contrasts of bright and faint galaxies within 8 Mpc alone make the Local Volume a ≃2.5 σ outlier in the ΛCDM cosmology. Our results indicate that the cosmic neighbourhood of the Milky Way may be unusual for galaxies of similar luminosity. The impact of the peculiar properties of our neighbourhood on the properties of the Milky Way and other nearby galaxies is not yet understood and warrants further study.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): catalogues - galaxies: abundances - large-scale structure of Universe

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 40

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Number of rows : 40
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 32 IG 00 42 41.825 +40 51 54.61 9.51 9.03 8.08     ~ 2049 2
2 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11446 1
3 M 74 G 01 36 41.772 +15 47 00.46 10.52 10.00 9.46 9.16   ~ 1488 1
4 NGC 891 H2G 02 22 32.907 +42 20 53.95 11.08 10.81 9.93 7.86   ~ 1567 2
5 LBN 659 GiG 02 36 35.469 +59 39 16.53   17       ~ 180 2
6 UGCA 39 GiG 02 41 55.092 +59 36 14.73   16       ~ 331 1
7 NGC 1269 GiG 03 17 18.600 -41 06 29.05 9.85 9.83 8.81 8.72   ~ 383 1
8 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1427 1
9 NAME Maffei Group GrG 03 49 +68.0           ~ 48 0
10 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15538 1
11 UGCA 127 GiG 06 20 55.735 -08 29 44.17   13.0   12.4 12.1 ~ 50 0
12 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1654 1
13 NGC 2683 AGN 08 52 41.345 +33 25 18.48 11.57 10.68 9.79 9.38   ~ 399 1
14 NGC 2784 G 09 12 19.497 -24 10 21.36 12.02 10.99 10.16 9.30   ~ 122 1
15 NGC 2905 H2G 09 32 10.111 +21 30 02.99 10.44 9.75 9.07 8.68   ~ 1027 3
16 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4081 5
17 NGC 3115 GiG 10 05 13.978 -07 43 06.89   11   9.37   ~ 951 2
18 HIJASS J1021+68 G 10 21 00.2 +68 42 00           ~ 20 0
19 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 765 1
20 M 108 SBG 11 11 30.967 +55 40 26.84   10.70       ~ 428 1
21 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1213 4
22 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2191 3
23 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6087 0
24 NAME LOCAL SUPERCL SCG 12 31 +12.4           ~ 475 0
25 M 104 LIN 12 39 59.43185 -11 37 22.9954 9.51 9.55 8.00 8.05   ~ 1304 3
26 NGC 4631 GiP 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 999 2
27 NGC 4656 GiP 12 43 57.6880843522 +32 10 13.343087893   10.96 10.52     ~ 333 3
28 NGC 4845 AGN 12 58 01.242 +01 34 32.09   17.40 16.31     ~ 218 0
29 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1326 2
30 M 63 LIN 13 15 49.2738527699 +42 01 45.726078017   9.34 8.59 8.35   ~ 1105 2
31 NAME Centaurus A Sy2 13 25 27.61509104 -43 01 08.8056025   8.18 6.84 6.66   ~ 4122 3
32 M 51 GiP 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 3958 4
33 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2318 2
34 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2642 2
35 ESO 223-6 G 14 58 30.3377983564 -47 41 56.346037399   12.2       ~ 30 0
36 ESO 223-9 G 15 01 08.4 -48 17 33   12.3   12.5 12.6 ~ 69 0
37 NGC 6744 GiG 19 09 46.099 -63 51 27.14   9.28 8.25 8.08 9.6 ~ 239 0
38 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2326 2
39 UGC 12632 GiG 23 29 58.78 +40 59 25.2   15.7       ~ 90 0
40 NAME Local Group GrG ~ ~           ~ 7359 0

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2021.09.26-04:37:29

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