J/MNRAS/445/2385 HST/ACS Coma Cluster Survey. X. (den Brok+, 2014)
The HST/ACS Coma Cluster Survey.
X. Nuclear star clusters in low-mass early-type galaxies: scaling relations.
den Brok M., Peletier R.F., Seth A., Balcells M., Dominguez L.,
Graham A.W., Carter D., Erwin P., Ferguson H.C., Goudfrooij P., Guzman R.,
Hoyos C., Jogee S., Lucey J., Phillipps S., Puzia T., Valentijn E.,
Kleijn G.V., Weinzirl T.
<Mon. Not. R. Astron. Soc., 445, 2385-2403 (2014)>
=2014MNRAS.445.2385D 2014MNRAS.445.2385D
ADC_Keywords: Galaxies, photometry ; Associations, stellar ; Photometry, HST
Keywords: galaxies: dwarf - galaxies: nuclei - galaxies: star clusters: general
Abstract:
We present scaling relations between structural properties of nuclear
star clusters and their host galaxies for a sample of early-type dwarf
galaxies observed as part of the Hubble Space Telescope (HST) Advanced
Camera for Surveys (ACS) Coma Cluster Survey. We have analysed the
light profiles of 200 early-type dwarf galaxies in the magnitude range
16.0<mF814W<22.6mag, corresponding to -19.0<MF814W←12.4mag.
Nuclear star clusters are detected in 80 percent of the galaxies, thus
doubling the sample of HST-observed early-type dwarf galaxies with
nuclear star clusters. We confirm that the nuclear star cluster
detection fraction decreases strongly towards faint magnitudes. The
luminosities of nuclear star clusters do not scale linearly with host
galaxy luminosity. A linear fit yields Lnuc∼Lgal0.57±0.05. The
nuclear star cluster-host galaxy luminosity scaling relation for
low-mass early-type dwarf galaxies is consistent with formation by
globular cluster (GC) accretion. We find that at similar luminosities,
galaxies with higher Sersic indices have slightly more luminous
nuclear star clusters. Rounder galaxies have on average more luminous
clusters. Some of the nuclear star clusters are resolved, despite the
distance of Coma. We argue that the relation between nuclear star
cluster mass and size is consistent with both formation by GC
accretion and in situ formation. Our data are consistent with GC
inspiralling being the dominant mechanism at low masses, although the
observed trend with Sersic index suggests that in situ star formation
is an important second-order effect.
Description:
The Coma ACS Survey (Carter et al., 2008ApJS..176..424C 2008ApJS..176..424C) provides data
in two passbands for 25 fields pointed at the core of the Coma cluster
and at the outskirts. The exposure times in the two passbands, F814W
and F475W (which are roughly equivalent to the IC and g band) were
∼1400 and ∼2600s. The original envisaged coverage of the cluster was
much larger than 25 fields, but due to the ACS failure in 2008 January
the survey was not completed.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 81 198 Structural parameters of galaxies used in the paper
tablea2.dat 155 55 Sources excluded from the analysis
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See also:
J/MNRAS/411/2439 : Coma Treasury Survey. Structural parameters (Hoyos+, 2011)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 26 A26 --- Name Galaxy name (1)
28- 35 F8.4 deg RAdeg Right ascension (J2000)
37- 43 F7.4 deg DEdeg Declination (J2000)
45 I1 --- Mm [0/3] Coma membership class, 1=yes (G1)
47- 50 F4.1 mag F814W Galaxy F814W magnitude (AB system)
52- 55 F4.2 mag e_F814W rms uncertainty on F814WG
57- 59 F3.1 --- n [0.4/5.9] Sersic index number
61- 64 F4.2 --- e_n [0.01/0.26] rms uncertainty on n
66- 69 F4.1 mag F814Wn ? Nuclear F814W magnitude (AB system)
71- 73 F3.1 mag e_F814Wn ? rms uncertainty on F814WN
75- 77 F3.1 pix FWHM [0.8/3.7]? Full width at half-maximum
79- 81 F3.1 pix e_FWHM [0/2.3]? rms uncertainty on FWHM
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Note (1): COMAi sources from Hammer et al. 2010ApJS..191..143H 2010ApJS..191..143H (Paper II),
in Simbad.
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Name ?=- Galaxy name (1)
25 I1 --- Mm [0/3] Coma membership class, 1=yes (G1)
27- 31 A5 --- Type Morphological type
33- 37 A5 --- Tile Tile number(s)
39- 44 F6.1 km/s cz [4684/9623]?=- Heliocentric redshift
46- 53 F8.4 deg RAdeg Right ascension (J2000)
55- 61 F7.4 deg DEdeg Declination (J2000)
63- 66 F4.1 mag F814W F814W magnitude
68-155 A88 --- Notes Comments on galaxy
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Note (1): CcGVNN sources are [PPH2009b] CcGVNN in Simbad,
<RB110 is [RB67] 110> in Simbad.
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Global notes:
Note (G1): Classes of possible members as follows:
1 = almost certainly members
2 = likely members
3 = possible members
0 = not members
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History:
From electronic version of the journal
References:
Carter et al., Paper I 2008ApJS..176..424C 2008ApJS..176..424C
Hammer et al., Paper II 2010ApJS..191..143H 2010ApJS..191..143H
Hoyos et al., Paper III 2011MNRAS.411.2439H 2011MNRAS.411.2439H, Cat. J/MNRAS/411/2439
Peng et al., Paper IV 2011ApJ...730...23P 2011ApJ...730...23P
Price et al., Paper V 2009MNRAS.397.1816P 2009MNRAS.397.1816P
den Brok et al., Paper VI 2011MNRAS.414.3052D 2011MNRAS.414.3052D
Weinzirl et al., Paper VII 2014MNRAS.441.3083W 2014MNRAS.441.3083W
Marinova et al., Paper VIII 2012ApJ...746..136M 2012ApJ...746..136M
(End) Patricia Vannier [CDS] 19-May-2015