J/ApJ/859/52 NGFS. III. Dwarf galaxies in outer regions (Ordenes-Briceno+, 2018)
The Next Generation Fornax Survey (NGFS).
III. Revealing the spatial substructure of the dwarf galaxy population inside
half of Fornax's virial radius.
Ordenes-Briceno Y., Eigenthaler P., Taylor M.A., Puzia T.H.,
Alamo-Martinez K., Ribbeck K.X., Munoz R. P, Zhang H., Grebel E.K.,
Angel S., Cote P., Ferrarese L., Hilker M., Lancon A., Mieske S.,
Miller B.W., Rong Y., Sanchez-Janssen R.
<Astrophys. J., 859, 52 (2018)>
=2018ApJ...859...52O 2018ApJ...859...52O
ADC_Keywords: Clusters, galaxy; Galaxies, optical; Morphology;
Magnitudes, absolute; Surveys
Keywords: galaxies: clusters: individual (Fornax) ; galaxies: dwarf ;
galaxies: elliptical and lenticular, cD
Abstract:
We report the discovery of 271 previously undetected dwarf galaxies in
the outer Fornax cluster regions at radii rvir/4<r<rvir/2 using
data from the Next Generation Fornax Survey (NGFS) with deep coadded
u', g', and i' images obtained with Blanco/DECam at Cerro Tololo
Interamerican Observatory. From the 271 dwarf candidates, we find 39
to be nucleated. Together with our previous study of the central
Fornax region, the new dwarfs detected with NGFS data number 392, of
which 56 are nucleated. The total Fornax dwarf galaxy population from
NGFS and other catalogs rises, therefore, to a total of 643 with 181
being nucleated, yielding an overall nucleation fraction of 28%. The
absolute i'-band magnitudes for the outer NGFS dwarfs are in the range
-18.80≤Mi'≤-8.78 with effective radii reff,i'=0.18-2.22kpc and
an average Sersic index i'=0.81. Nonnucleated dwarfs are found to
be fainter and smaller by Δ<Mi'≥2.25mag and
Δ<reff,i'≥0.4kpc than the nucleated dwarfs. We demonstrate a
significant clustering of dwarf galaxies on scales ≲100kpc, and
projected surface number density profile estimates, ΣN(r),
show a concentration of dwarfs in the Fornax core region within
r≲350kpc. ΣN(r) has a flat distribution up to ∼350kpc, beyond
which it declines for the nonnucleated dwarfs. The nucleated dwarfs
have a steeper ΣN(r) distribution, are more concentrated toward
NGC 1399, and are decreasing rapidly outwards. This is the first time
the transition from cluster to field environment has been established
for the very faint dwarf galaxy population with robust sample
statistics.
Description:
The data presented in this paper is part of the observed NGFS (Munoz+
2015, J/ApJ/813/L15), an ongoing, panchromatic ∼30deg2 survey of the
Fornax galaxy cluster using the Dark Energy Camera (DECam) mounted on
the 4m Blanco telescope at Cerro Tololo Interamerican Observatory (CTIO).
We expand upon the results of Paper I (Munoz+, 2015, J/ApJ/813/L15)
and II (Eigenthaler+, 2018, J/ApJ/855/142) by using the surrounding
DECam pointings (NGFS tiles 2-7; see Figure 1) to identify 271 new
dwarf galaxy candidates, of which 39 are nucleated.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 78 384 Dwarf galaxies in the Fornax cluster
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See also:
VII/180 : Galaxies in Fornax Cluster and five nearby groups (Ferguson+ 1990)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)
J/ApJS/164/334 : ACS Virgo Cluster Survey. VI (Ferrarese+, 2006)
J/ApJ/660/1186 : VCC galaxies classification with SDSS (Lisker+, 2007)
J/A+A/463/503 : Early-type dwarf galaxies in Fornax cluster (Mieske+, 2007)
J/A+A/486/697 : Hydra I Cluster Catalogue (HCC) (Misgeld+, 2008)
J/MNRAS/414/3052 : HST/ACS Coma Cluster Survey. VI. (den Brok+, 2011)
J/ApJS/197/21 : The Carnegie-Irvine Galaxy Survey (CGS). I. (Ho+, 2011)
J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)
J/ApJ/763/40 : UBVI phot. of GCs in the Fornax galaxy cluster (Kim+, 2013)
J/ApJ/813/L15 : Dwarf galaxies in Fornax cluster from NGFS (Munoz+, 2015)
J/ApJ/844/157 : Ultradiffuse galaxies in deep HST images of HFF (Lee+, 2017)
J/A+A/605/A46 : Sgr dSph nucleus star abundances (Mucciarelli+, 2017)
J/A+A/608/A142 : Fornax Deep Survey with VST. III. LSB gal. (Venhola+, 2017)
J/ApJ/855/142 : Next Generation Fornax Survey (NGFS) II (Eigenthaler+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- --- [NGFS]
5- 17 A13 --- NGFS Identification (HHMMSS+DDMMSS; J2000)
19- 20 I2 h RAh [3] Hour of Right Ascension (J2000)
22- 23 I2 min RAm [26/51] Minute of Right Ascension (J2000)
25- 29 F5.2 s RAs Second of Right Ascension (J2000)
31- 31 A1 --- DE- [-] Sign of the Declination (J2000)
32- 33 I2 deg DEd [32/38] Degree of Declination (J2000)
35- 36 I2 arcmin DEm Arcminute of Declination (J2000)
38- 41 F4.1 arcsec DEs Arcsecond of Declination (J2000)
43- 47 F5.2 mag imag [12.7/22.8] CTIO/DECam i band magnitude
49- 54 F6.2 mag iMag [-18.8/-8.7] Absolute i band magnitude (1)
56- 59 F4.2 --- n [0.1/2.5] Sersic index (2)
61- 66 F6.3 arcsec Reff1 [1.8/23] Effective radius in arcseconds
68- 72 F5.3 kpc Reff2 [0.1/2.3] Effective radius in kpc (1)
74- 74 A1 --- Type Morphological type (o=non-nucleated or
x=nucleated dwarf galaxy)
76- 78 I3 --- FCC [44/337]? Identifier from the Fornax Cluster
Catalog (Ferguson+ 1990, VII/180)
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Note (1): Assuming a distance modulus of (m-M)0=31.51mag,
Blakeslee et al. (2009ApJ...694..556B 2009ApJ...694..556B)
Note (2): Sersic (1968adga.book.....S 1968adga.book.....S) and Caon et al. (1993MNRAS.265.1013C 1993MNRAS.265.1013C)
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History:
From electronic version of the journal
References:
Munoz et al. Paper I 2015ApJ...813L..15M 2015ApJ...813L..15M J/ApJ/813/L15
Eigenthaler et al. Paper II 2018ApJ...855..142E 2018ApJ...855..142E J/ApJ/855/142
Ordenes-Briceno et al. Paper III 2018ApJ...859...52O 2018ApJ...859...52O This catalog
Ordenes-Briceno et al. Paper IV 2018ApJ...860....4O 2018ApJ...860....4O J/ApJ/860/4
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 26-Apr-2019