TY - JOUR
T1 - Unveiling a rich system of faint dwarf galaxies in the next generation fornax survey
AU - Muñoz, Roberto P.
AU - Eigenthaler, Paul
AU - Puzia, Thomas H.
AU - Taylor, Matthew A.
AU - Ordenes-Briceño, Yasna
AU - Alamo-Martínez, Karla
AU - Ribbeck, Karen X.
AU - Ángel, Simón
AU - Capaccioli, Massimo
AU - Côté, Patrick
AU - Ferrarese, Laura
AU - Galaz, Gaspar
AU - Hempel, Maren
AU - Hilker, Michael
AU - Jordán, Andrés
AU - Lançon, Ariane
AU - Mieske, Steffen
AU - Paolillo, Maurizio
AU - Richtler, Tom
AU - Sánchez-Janssen, Ruben
AU - Zhang, Hongxin
N1 - Publisher Copyright:
© 2015. The American Astronomical Society. All rights reserved..
PY - 2015/11/1
Y1 - 2015/11/1
N2 - 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 < 2.8 kpc, and average effective surface brightness values 22.0 < μi < 28.0 mag arcsec-2. 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 = -8.0 mag. 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 ≃ -15.0 mag to 0% at luminosities fainter than Mi ≃ -10.0 mag. 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.
AB - 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 < 2.8 kpc, and average effective surface brightness values 22.0 < μi < 28.0 mag arcsec-2. 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 = -8.0 mag. 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 ≃ -15.0 mag to 0% at luminosities fainter than Mi ≃ -10.0 mag. 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.
KW - galaxies: clusters: individual (Fornax)
KW - galaxies: dwarf
KW - galaxies: elliptical and lenticular, cD
UR - http://www.scopus.com/inward/record.url?scp=84947566225&partnerID=8YFLogxK
U2 - 10.1088/2041-8205/813/1/L15
DO - 10.1088/2041-8205/813/1/L15
M3 - Article
AN - SCOPUS:84947566225
SN - 2041-8205
VL - 813
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L15
ER -