2019ApJ...876...53J


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.29CET22:12:01

2019ApJ...876...53J - Astrophys. J., 876, 53-53 (2019/May-1)

Chandra detection of intracluster X-ray sources in Fornax.

JIN X., HOU M., ZHU Z. and LI Z.

Abstract (from CDS):

Based on archival Chandra observations with a total exposure of 1.3 Ms, we study X-ray point sources in the Fornax cluster of galaxies, with the primary aim of searching for intracluster X-ray source populations. We detect 1177 point sources out to a projected radius of ∼30 arcmin (∼180 kpc) from the cluster center and down to a limiting 0.5-8 keV luminosity of ∼3 x 1037 erg s–1. We construct the source surface density profile, after excluding sources associated with foreground stars, known globular clusters, ultra-compact dwarfs, and galactic nuclei. From this profile we statistically identify ∼183 excess sources that are not associated with the bulk stellar content of the individual member galaxies of Fornax, nor with the cosmic X-ray background. Taking into account Poisson error and cosmic variance, the cumulative significance of this excess is at the >=2σ level (with a maximum of 3.6σ) outside three effective radii of the central giant elliptical, NGC 1399. The luminosity function of the excess sources is found to be significantly steeper than that of the GC-hosting sources (presumably low-mass X-ray binaries (LMXBs)), disfavoring the possibility that unidentified GCs are primarily responsible for the excess. We show that a large fraction of the excess can be related to the extended stellar halo of NGC 1399 and/or the diffuse intracluster light, thus providing strong evidence for the presence of intracluster X-ray sources in Fornax, the second unambiguous case for a galaxy cluster after Virgo. Other possible origins of the excess, including supernova-kicked LMXBs and stripped nucleated dwarf galaxies are discussed.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: clusters: individual: Fornax - X-rays: binaries - X-rays: galaxies: clusters

Status at CDS : Examining the need for a new acronym. // Large table(s) of objects being ingested in VizieR.

Simbad objects: 38

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Number of rows : 38

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 NGC 1379 GiP 03 36 03.940 -35 26 28.23 12.17 12.04 10.91 10.60   ~ 243 1
2 NGC 1381 GiP 03 36 31.6595958424 -35 17 42.745665386 12.90 12.47 11.50 11.02   ~ 214 1
3 NG 115 LSB 03 36 37.238 -35 23 09.27           ~ 19 2
4 FCC 175 LSB 03 36 42.7 -35 26 02   18.8       ~ 12 0
5 MCG-06-09-008 GiP 03 36 54.315 -35 22 29.04   14.81       ~ 69 2
6 NGC 1387 GiP 03 36 57.0325944947 -35 30 23.691986124 12.18 11.75 10.69 10.16   ~ 222 1
7 6dFGS gJ033704.6-353524 GiC 03 37 04.66 -35 35 24.0   15.94   15.65   ~ 33 0
8 NGC 1382 GiP 03 37 08.953 -35 11 42.09 13.19 13.79 12.92 12.31   ~ 101 1
9 LEDA 74787 LSB 03 37 09.967 -35 23 12.02   19.3       ~ 14 0
10 NGC 1389 GiP 03 37 11.7424496792 -35 44 45.871664087 12.80 12.39 11.50 10.99   ~ 175 1
11 LEDA 74790 LSB 03 37 17.904 -35 41 57.12   18.2 17.80     ~ 19 1
12 LEDA 74792 LSB 03 37 34.010 -35 49 45.16   17.7       ~ 20 0
13 LEDA 74796 LSB 03 37 41.088 -35 17 46.13   19.1       ~ 15 0
14 NGC 1396 GiG 03 38 06.5660885410 -35 26 23.636856735   14.80       ~ 80 1
15 LEDA 74806 LSB 03 38 18.80 -35 31 49.4   17.3 17.18     ~ 28 1
16 2MASX J03381926-3507447 GiC 03 38 19.265 -35 07 44.74   15.60 15.34     ~ 45 0
17 6dFGS gJ033821.5-351535 GiC 03 38 21.4889017345 -35 15 34.954402800   15.89 15.65     ~ 24 0
18 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1463 1
19 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1568 0
20 LEDA 74816 LSB 03 38 36.619 -35 50 02.21   19.0 18.91     ~ 17 0
21 LEDA 74817 LSB 03 38 37.632 -35 45 27.33   19.2 19.21     ~ 21 1
22 LEDA 74821 LSB 03 38 45.336 -35 15 59.93   18.5       ~ 18 0
23 NGC 1404 GiP 03 38 51.917 -35 35 39.81 11.53 10.69 10.00 9.03   ~ 675 1
24 2MASS J03385407-3533331 GiC 03 38 54.0548295896 -35 33 33.352307509   18.5 18.06     ~ 69 0
25 LEDA 74826 GiC 03 38 55.048 -35 14 13.20   19.5       ~ 11 0
26 LEDA 13449 GiC 03 39 13.42 -35 22 15.7   15.1 14.91     ~ 50 1
27 LEDA 13452 GiC 03 39 19.60 -35 43 29.0   16.10 15.89     ~ 31 1
28 LEDA 74850 LSB 03 39 50.069 -35 31 22.28   19.3       ~ 16 1
29 LEDA 74851 GiC 03 39 51.382 -35 19 19.46   18.8 18.69     ~ 13 0
30 LEDA 74856 LSB 03 39 55.395 -35 39 43.01   19.1 18.75     ~ 16 0
31 ESO 358-49 GiP 03 40 09.0 -35 37 34   13.44   12.68 13.3 ~ 85 1
32 LEDA 13515 LSB 03 40 23.41 -35 16 32.8   16.20       ~ 29 2
33 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5909 0
34 M 49 Sy2 12 29 46.798 +08 00 01.48   13.21 12.17     ~ 1971 2
35 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6283 3
36 M 104 LIN 12 39 59.43185 -11 37 22.9954 9.51 9.55 8.00 8.05   ~ 1285 3
37 SDSS J124211.04+113841.2 G 12 42 11.041 +11 38 41.21           ~ 22 0
38 NAME M60-UCD1 G 12 43 35.964 +11 32 04.69           ~ 74 0

    Equat.    Gal    SGal    Ecl

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2020.10.29-22:12:01

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