2005A&A...443..883P


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.13CEST16:17:45

2005A&A...443..883P - Astronomy and Astrophysics, volume 443, 883-889 (2005/12-1)

The extragalactic Cepheid bias: significant influence on the cosmic distance scale.

PATUREL G. and TEERIKORPI P.

Abstract (from CDS):

The unique measurements with the Hubble Space Telescope of Cepheid variable stars in nearby galaxies led to extragalactic distances that made the HST Key Project conclude that the Hubble constant is H0=72km/s/Mpc. The idea that H0 is now known is widely spread among the astronomical community. Some time ago, we suggested that a strong selection effect may still exist in the Cepheid method, resulting in too short distances. Using a model similar to traditional bias corrections, we deduce here new estimates of distances from HST and previous ground-based observations which are both affected by this effect, showing the same trend which starts at different distances. The recent measurement of M83 with the VLT is unbiased. Revisiting the calibration of HSTKP's with our new scale, makes long-range distance criteria more concordant and reduces the value of H0 to ≃60km/s/Mpc. Locally, the corrected Cepheid distances give Hlocal=56km/s/Mpc and reduce the velocity dispersion in the Hubble flow. These numbers are indicative of the influence of the suggested Cepheid bias in the context of the HSTKP studies and are not final values.

Abstract Copyright:

Journal keyword(s): stars: variables: Cepheids - cosmology: distance scale

Simbad objects: 34

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Number of rows : 34

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 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 11266 1
2 NGC 925 H2G 02 27 16.913 +33 34 43.97   10.69 10.12 9.55   ~ 714 1
3 ESO 357-28 IG 03 25 08.2 -36 21 51   13.80   12.91 13.7 ~ 84 0
4 NGC 1365 Sy1 03 33 36.458 -36 08 26.37 10.48 10.08 9.63 8.79 9.7 ~ 1566 2
5 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1598 0
6 NGC 1425 EmG 03 42 11.4841820747 -29 53 36.192654761   11.61   11.6 10.9 ~ 188 0
7 NGC 2090 GiG 05 47 01.8563832745 -34 15 01.657223780 12.17 11.70 11.20 10.43 11.0 ~ 164 1
8 NGC 2403 AGN 07 36 51.396 +65 36 09.17 9.31 8.84 8.38 8.19   ~ 1644 1
9 NGC 2541 GiG 08 14 40.1104536348 +49 03 42.058472450 12.03 12.26 11.80     ~ 283 1
10 NAME M 81-82 Group GrG 09 55 +69.1           ~ 648 0
11 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 4055 5
12 NGC 3198 EmG 10 19 54.990 +45 32 58.88 10.83 10.87 10.33     ~ 834 1
13 NGC 3319 SyG 10 39 09.533 +41 41 12.74   11.48 11.07     ~ 285 1
14 M 95 GiP 10 43 57.69173 +11 42 13.6274 10.71 10.51 9.73 9.48   M0 975 2
15 M 96 GiP 10 46 45.744 +11 49 11.78 10.42 10.15 9.25 8.99   ~ 758 1
16 NAME M96 Group GrG 10 48 +13.3           ~ 286 0
17 NGC 3621 AGN 11 18 16.300 -32 48 45.36 10.10 9.44 9.56 8.07 10.1 ~ 502 3
18 M 66 GiP 11 20 15.026 +12 59 28.64 9.85 9.65 8.92     ~ 1199 4
19 M 106 Sy2 12 18 57.620 +47 18 13.39   9.14 8.41 8.11   ~ 2179 3
20 M 100 AGN 12 22 54.9318850854 +15 49 20.294302163 10.04 10.05 9.35     ~ 1692 2
21 NGC 4414 GiG 12 26 27.089 +31 13 24.76 11.12 10.96 10.12     ~ 524 2
22 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 6009 0
23 NGC 4505 GiP 12 31 39.2222350443 +03 56 21.641915355   11.71       ~ 318 0
24 NGC 4535 H2G 12 34 20.310 +08 11 51.94   11.1       ~ 536 0
25 NGC 4536 GiP 12 34 27.129 +02 11 16.37 11.14 11.16 10.55 17.393   ~ 770 3
26 M 91 LIN 12 35 26.430 +14 29 46.75   14.63 13.57     ~ 536 0
27 NGC 4639 GiP 12 42 52.3781396179 +13 15 26.712929286   13.62 12.72     ~ 570 0
28 NGC 4725 Sy2 12 50 26.5692916552 +25 30 02.737610391   13.45 12.44     ~ 633 2
29 IC 4182 BiC 13 05 48.7470958923 +37 36 13.015792630   11.86   11.40   ~ 322 1
30 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2296 2
31 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1285 4
32 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2618 2
33 NGC 7331 LIN 22 37 04.102 +34 24 57.31 10.65 10.35 9.48     ~ 1133 2
34 NAME Local Group GrG ~ ~           ~ 7229 0

    Equat.    Gal    SGal    Ecl

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2021.04.13-16:17:45

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