2017A&A...604A..59M


Query : 2017A&A...604A..59M

2017A&A...604A..59M - Astronomy and Astrophysics, volume 604A, 59-59 (2017/8-1)

Observing the very low surface brightness dwarfs in a deep field in the VIRGO cluster: constraints on dark matter scenarios.

MENCI N., GIALLONGO E., GRAZIAN A., PARIS D., FONTANA A. and PENTERICCI L.

Abstract (from CDS):

We report the discovery of 11 very faint (r≤23), low surface brightness (µr≤27mag/arcsec2) dwarf galaxies in one deep field in the Virgo cluster, obtained by the prime focus cameras (LBC) at the Large Binocular Telescope (LBT). These extend our previous sample to reach a total number of 27 galaxies in a field of just ∼0.17deg2 located at a median distance of 390 kpc from the cluster centre. The association of such galaxies with the Virgo cluster is supported by their separate position in the central surface brightness - total magnitude plane with respect to the background galaxies of similar total magnitude. For a significant fraction (26%) of the sample, the association to the cluster is confirmed by spectroscopic follow-up. We show that the mere abundance of satellite galaxies corresponding to our observed number in the target field provides extremely tight constraints on dark matter models with suppressed power spectrum compared to the cold dark matter case, independently of the galaxy luminosity distribution. In particular, the requirement that the observed number of satellite galaxies not exceed the predicted abundance of dark matter sub-halos yields a limit of mX≥3keV at 1-σ and mX≥2.3keV at 2-σ confidence level for the mass of thermal warm dark matter particles. Such a limit is competitive with other limits set by the abundance of ultra-faint satellite galaxies in the Milky Way, is completely independent of baryon physics involved in galaxy formation, and has the potentiality for appreciable improvements with future observations. We extend our analysis to dark matter models based on sterile neutrinos, showing that our observations set tight constraints on the combination of sterile neutrino mass mν and mixing parameter sin2(2θ). We discuss the robustness of our results with respect to systematics.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: clusters: individual: Coma cluster - dark matter - dark matter

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 - 2023
#notes
1 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12095 1
2 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6377 0
3 LEDA 41174 G 12 29 32.032 +13 30 37.68   18.0       ~ 15 0
4 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 627 1
5 2MASX J12295113+1352042 GiC 12 29 51.134 +13 52 04.23           ~ 18 0
6 NGC 4477 Sy2 12 30 02.1955766304 +13 38 11.543715888 11.98 11.38 10.42     ~ 386 2
7 NGC 4479 GiG 12 30 18.3716396496 +13 34 39.522722196 13.73 13.40 12.44     ~ 176 2
8 LEDA 41345 G 12 30 44.622 +13 47 57.94           ~ 16 0
9 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 6826 3
10 LEDA 41428 GiC 12 31 16.90 +13 49 41.2   16       ~ 20 0
11 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1889 1
12 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4599 2

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2023.01.27-22:18:31

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