2017ApJ...848L..31H


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.22CET09:25:37

2017ApJ...848L..31H - Astrophys. J., 848, L31-L31 (2017/October-3)

The distance to NGC 4993: the host galaxy of the gravitational-wave event GW170817.

HJORTH J., LEVAN A.J., TANVIR N.R., LYMAN J.D., WOJTAK R., SCHRODER S.L., MANDEL I., GALL C. and BRUUN S.H.

Abstract (from CDS):

The historic detection of gravitational waves from a binary neutron star merger (GW170817) and its electromagnetic counterpart led to the first accurate (sub-arcsecond) localization of a gravitational-wave event. The transient was found to be ∼10'' from the nucleus of the S0 galaxy NGC 4993. We report here the luminosity distance to this galaxy using two independent methods. (1) Based on our MUSE/VLT measurement of the heliocentric redshift (zhelio = 0.009783 ± 0.000023), we infer the systemic recession velocity of the NGC 4993 group of galaxies in the cosmic microwave background (CMB) frame to be vCMB = 3231 ± 53 km s–1. Using constrained cosmological simulations we estimate the line-of-sight peculiar velocity to be vpec = 307 ± 230 km s–1, resulting in a cosmic velocity of vcosmic = 2924 ± 236 km s–1 (zcosmic = 0.00980 ± 0.00079) and a distance of Dz = 40.4 ± 3.4 Mpc assuming a local Hubble constant of H0 = 73.24 ± 1.74 km s–1 Mpc–1. (2) Using Hubble Space Telescope measurements of the effective radius (15.''5 ± 1.''5) and contained intensity and MUSE/VLT measurements of the velocity dispersion, we place NGC 4993 on the Fundamental Plane (FP) of E and S0 galaxies. Comparing to a frame of 10 clusters containing 226 galaxies, this yields a distance estimate of DFP = 44.0 ± 7.5 Mpc. The combined redshift and FP distance is D_NGC 4993_ = 41.0 ± 3.1 Mpc. This "electromagnetic" distance estimate is consistent with the independent measurement of the distance to GW170817 as obtained from the gravitational-wave signal (DGW=43.8–6.9+2.9 Mpc) and confirms that GW170817 occurred in NGC 4993.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: distances and redshifts - galaxies: fundamental parameters - galaxies: individual: NGC 4993 - galaxies: individual: NGC 4993

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME PER SUPERCL SCG 02 33.2 +41 37           ~ 357 1
2 ACO 426 ClG 03 19 47.2 +41 30 47           ~ 1904 1
3 NAME Great Attractor SCG 10 32 -46.0           ~ 448 0
4 NAME M96 Group GrG 10 48 +13.3           ~ 273 0
5 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5699 0
6 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4130 2
7 NGC 4970 GiG 13 07 33.754 -24 00 30.98   13.24   11.73   ~ 29 0
8 NGC 4993 GiG 13 09 47.706 -23 23 01.79   13.34   11.92   ~ 201 0
9 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 612 0
10 ESO 508-19 EmG 13 09 50.790 -24 14 30.78   14.06   13.14 13.5 ~ 49 1
11 ACO 3627 ClG 16 14 22.5 -60 52 07           ~ 246 2
12 NAME Local Group GrG ~ ~           ~ 6761 0

    Equat.    Gal    SGal    Ecl

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2020.01.22-09:25:37

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