J/ApJ/813/L15 Dwarf galaxies in Fornax cluster from NGFS (Munoz+, 2015)
Unveiling a rich system of faint dwarf galaxies in the
Next Generation Fornax Survey.
Munoz R.P., Eigenthaler P., Puzia T.H., Taylor M.A., Ordenes-Briceno Y.,
Alamo-Martinez K., Ribbeck K.X., Angel S., Capaccioli M., Cote P.,
Ferrarese L., Galaz G., Hempel M., Hilker M., Jordan A., Lancon A.,
Mieske S., Paolillo M., Richtler T., Sanchez-Janssen R., Zhang H.
<Astrophys. J., 813, L15 (2015)>
=2015ApJ...813L..15M 2015ApJ...813L..15M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, optical ; Morphology ; Surveys ;
Photometry, ugriz
Keywords: galaxies: clusters: individual: Fornax;
galaxies: dwarf; galaxies: elliptical and lenticular, cD
Abstract:
We report the discovery of 158 previously undetected dwarf galaxies in
the Fornax cluster central regions using a deep coadded u-, g-, and
i-band image obtained with the Dark Energy Camera wide-field camera
mounted on the 4-m Blanco telescope at the Cerro Tololo Interamerican
Observatory as part of the Next Generation Fornax Survey (NGFS). The
new dwarf galaxies have quasi-exponential light profiles, effective
radii 0.1<re<2.8kpc, and average effective surface brightness values
22.0<µi<28.0mag/arcsec2. We confirm the existence of
ultra-diffuse galaxies (UDGs) in the Fornax core regions that resemble
counterparts recently discovered in the Virgo and Coma galaxy
clusters. We also find extremely low surface brightness NGFS dwarfs,
which are several magnitudes fainter than the classical UDGs. The
faintest dwarf candidate in our NGFS sample has an absolute magnitude
of Mi=-8.0mag. The nucleation fraction of the NGFS dwarf galaxy
sample appears to decrease as a function of their total luminosity,
reaching from a nucleation fraction of >75% at luminosities brighter
than Mi~=-15.0mag to 0% at luminosities fainter than Mi~=-10.0mag.
The two-point correlation function analysis of the NGFS dwarf sample
shows an excess on length scales below ∼100 kpc, pointing to the
clustering of dwarf galaxies in the Fornax cluster core.
Description:
The Next Generation Fornax Survey (NGFS) is an ongoing
multi-wavelength survey of the central 30deg2 of the Fornax galaxy
cluster. We are using the 4-m Blanco/DECam for near-ultraviolet and
optical photometry as well as VISTA/VIRCam for near-infrared
photometry of the same field.
In this Letter, we present the analysis of the central 3deg2
(Figure 1), covering the Fornax cluster core out to ∼350kpc radius
from NGC1399.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 88 284 Dwarf galaxies in the core of the Fornax cluster
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See also:
VII/180 : Galaxies in Fornax Cluster and five nearby groups (Ferguson+ 1990)
J/AJ/144/4 : Dwarf galaxies in the Local Group (McConnachie+, 2012)
J/ApJS/197/21 : The Carnegie-Irvine Galaxy Survey (CGS). I. (Ho+, 2011)
J/AJ/137/498 : UCD and bright GC in Fornax (Gregg+, 2009)
J/A+A/463/503 : Early-type dwarf galaxies in Fornax cluster (Mieske+, 2007)
J/A+A/418/445 : FCOS Ultra Compact Dwarf galaxies radial vel. (Mieske+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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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 [33/43] Minute of Right Ascension (J2000)
25- 29 F5.2 s RAs Second of Right Ascension (J2000)
31 A1 --- DE- [-] Sign of the Declination (J2000)
32- 33 I2 deg DEd [34/36] Degree of Declination (J2000)
35- 36 I2 arcmin DEm Arcminute of Declination (J2000)
38- 42 F5.2 arcsec DEs Arcsecond of Declination (J2000)
44- 48 F5.2 mag imag [13.5/23.6]? The i band magnitude
50- 55 F6.2 mag iMag [-18/-7.9]? The i band absolute magnitude (1)
57- 60 F4.2 --- n [0.08/2.3]? Sersic index (2)
62- 67 F6.3 arcsec Reff1 [0.9/28.1]? Effective radius in arcseconds
69- 73 F5.3 kpc Reff2 [0.09/2.8]? Effective radius in kpc (1)
75 A1 --- Type [ox] Morphological type (3)
77- 88 A12 --- OID Reference source identifier (4)
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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).
Note (3): Type as follows:
o = non-nucleated dwarf galaxy.
x = nucleated dwarf galaxy.
Note (4): Galaxy naming in previous publications:
FCCNNN = Sources already included in the Fornax Cluster
Catalog (Ferguson et al., 1990, Cat. VII/180).
WFLSBNN-N = sources already included in Hilker et al. (2003A&A...397L...9H 2003A&A...397L...9H).
IMNNN_LSBN = sources already included in Mieske et al. 2007, J/A+A/463/503;
<[MHI2007] WFLSBNN-NN> or <[MHI2007] IMN-N-N-LSBN> in Simbad.
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History:
From electronic version of the journal
References:
Munoz et al. Paper I 2015ApJ...813L..15M 2015ApJ...813L..15M This catalog
Eigenthaler et al. Paper II 2018ApJ...855..142E 2018ApJ...855..142E Cat. J/ApJ/855/142
Ordenes-Briceno et al. Paper III 2018ApJ...859...52O 2018ApJ...859...52O Cat. J/ApJ/859/52
Ordenes-Briceno et al. Paper IV 2018ApJ...860....4O 2018ApJ...860....4O Cat. J/ApJ/860/4
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 17-Feb-2016