2016ApJ...830...99L

Query : 2016ApJ...830...99L

2016ApJ...830...99L - Astrophys. J., 830, 99-99 (2016/October-3)

The ACS Fornax cluster survey. XII. Diffuse star clusters in early-type galaxies.

LIU Y., PENG E.W., LIM S., JORDAN A., BLAKESLEE J., COTE P., FERRARESE L. and PATTARAKIJWANICH P.

Abstract (from CDS):

Diffuse star clusters (DSCs) are old and dynamically hot stellar systems that have lower surface brightness and more extended morphology than globular clusters (GCs). Using the images from Hubble Space Telescope (HST)/ACS Fornax Cluster Survey, we find that 12 out of 43 early-type galaxies (ETGs) in the Fornax Cluster host significant numbers of DSCs. Together with literature data from the HST/ACS Virgo Cluster Survey, where 18 out of 100 ETGs were found to host DSCs, we systematically study the relationship of DSCs with GCs and their host galaxy environment. Two DSC hosts are post-merger galaxies, with most of the other hosts either having low mass or showing clear disk components. We find that while the number ratio of DSCs to GCs is nearly constant in massive galaxies, the DSC-to-GC ratio becomes systematically higher in lower-mass hosts. This suggests that DSCs may be more efficient at forming (or surviving) in low-density environments. DSC hosts are not special either in their position in the cluster or in the galactic color-magnitude diagram. Why some disk and low-mass galaxies host DSCs while others do not is still a puzzle, however. The mean ages of DSC hosts and nonhosts are similar at similar masses, implying that formation efficiency rather than survival is the reason behind different DSC number fractions in ETGs.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: clusters: individual: (Fornax, Virgo) - galaxies: star clusters: general - galaxies: star clusters: general

Simbad objects: 48

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Number of rows : 48
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NAME Sculptor dE1 GiG 00 23 51.7 -24 42 18   17.73       ~ 69 1
2 NAME Scl-dE1 GC1 GlC 00 23 52.69 -24 41 58.0           ~ 7 0
3 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12643 1
4 NGC 922 EmG 02 25 04.400 -24 47 17.46   12.54 12.21 11.84   ~ 148 0
5 NGC 1023 AG? 02 40 24.0133575864 +39 03 47.663392896 10.91 10.35 9.35 7.83   ~ 660 2
6 NGC 1316 BL? 03 22 41.789 -37 12 29.52 9.81 9.15 8.53 7.66   ~ 1387 1
7 IC 1919 GiG 03 26 02.2132576776 -32 53 40.323783768   13.78   12.60   ~ 81 0
8 NGC 1336 GiG 03 26 32.1845365512 -35 42 48.662672184   13.12   11.95   ~ 135 0
9 NGC 1340 GiG 03 28 19.6251763296 -31 04 05.435465520   11.20 10.32 9.70   ~ 214 1
10 NGC 1351 GiG 03 30 34.9598617824 -34 51 14.242996620   12.30   10.85   ~ 181 0
11 NGC 1375 GiG 03 35 16.8025873104 -35 15 56.371399740 13.50 13.02 12.40 11.74   ~ 165 1
12 NGC 1380 Sy2 03 36 27.590 -34 58 34.68 11.32 10.94 9.93 9.37   ~ 429 1
13 ESO 358-33 GiG 03 36 47.5007323848 -34 44 22.739259552 13.63 13.36 12.41 12.00   ~ 143 1
14 MCG-06-09-008 GiP 03 36 54.3158470008 -35 22 28.948080864   14.81       ~ 95 2
15 NGC 1387 Sy2 03 36 57.0337458600 -35 30 23.675934060 12.18 11.75 10.69 10.16   ~ 262 1
16 NGC 1382 GiP 03 37 08.9722655064 -35 11 41.995386996 13.19 13.79 12.92 12.31   ~ 123 1
17 NGC 1396 GiG 03 38 06.5677454520 -35 26 23.637846372   14.80       ~ 98 1
18 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1570 1
19 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 1826 0
20 ESO 359-2 GiG 03 50 36.7310457912 -35 54 34.013712996   14.48   13.49   ~ 83 0
21 IC 2006 EmG 03 54 28.4628183240 -35 58 01.673622516   12.39   10.94 11.9 ~ 207 0
22 NGC 3384 GiG 10 48 16.8855574392 +12 37 45.371165844   10.0       ~ 596 1
23 IC 3019 GiG 12 09 22.257 +13 59 32.73   15.0       ~ 109 0
24 NGC 4262 GiG 12 19 30.5694336288 +14 52 39.517143276 13.00 12.49 11.55     ~ 356 1
25 NGC 4267 GiG 12 19 45.2735790120 +12 47 53.704780368   12.4       ~ 243 0
26 NGC 4371 GiG 12 24 55.4333579760 +11 42 15.144247584 12.35 11.79 10.81     ~ 318 1
27 M 85 GiP 12 25 24.053 +18 11 27.89   10.2       ~ 644 0
28 M 86 GiG 12 26 11.814 +12 56 45.49 10.32 9.83 8.90   7.50 ~ 1084 1
29 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6642 0
30 NGC 4435 GiG 12 27 40.503 +13 04 44.48 12.23 11.74 10.80     ~ 445 2
31 NGC 4442 GiG 12 28 03.8815318272 +09 48 13.426522272   11.2       ~ 283 0
32 NGC 4459 H2G 12 29 00.0329905416 +13 58 42.826603332   11.6       ~ 539 0
33 NGC 4467 GiG 12 29 30.2447376768 +07 59 34.273371336   15.2       ~ 179 0
34 LEDA 41180 AG? 12 29 34.9891966080 +08 03 28.781563608           ~ 84 0
35 M 49 Sy2 12 29 46.8 +08 00 01   13.21 12.17     ~ 2093 2
36 NGC 4473 GiG 12 29 48.878 +13 25 45.55 11.60 11.16 10.20     ~ 644 1
37 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7190 3
38 IRAS 12315+0758 GiG 12 34 03.029 +07 41 56.90   10.6       ~ 670 0
39 M 89 LIN 12 35 39.80733343 +12 33 22.8308657 11.29 10.73 9.75     ~ 995 2
40 NGC 4578 GiG 12 37 30.5571349752 +09 33 18.241180344   12.9       ~ 280 0
41 IC 3602 GiG 12 38 07.097 +10 04 57.22   15.5       ~ 82 0
42 NGC 4612 GiG 12 41 32.7539216616 +07 18 53.535354804   11.90       ~ 214 1
43 M 59 GiG 12 42 02.2581375168 +11 38 48.909507756   11.0       ~ 693 0
44 NGC 4754 GiP 12 52 17.563 +11 18 49.18   11.6       ~ 284 0
45 NGC 4762 LIN 12 52 56.049 +11 13 50.88   11.1       ~ 360 0
46 M 51 Sy2 13 29 52.698 +47 11 42.93   9.26 8.36 8.40   ~ 4329 4
47 NGC 5195 GiP 13 29 59.590 +47 15 58.06 10.76 10.45 9.55 9.31   ~ 778 3
48 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1562 0

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