Dwarf Galaxy Discoveries from the KMTNet Supernova Program. I. The NGC 2784 Galaxy Group*
- 5 October 2017
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 848 (1), 19
- https://doi.org/10.3847/1538-4357/aa88ab
Abstract
We present BVI surface photometry of 31 dwarf galaxy candidates discovered in a deep image stack from the KMTNet Supernova Program of ~30 square degrees centered on the nearby NGC 2784 galaxy group. Our final images have a 3σ surface brightness detection limit of mag arcsec−2. The faintest central surface brightness that we measure is mag arcsec−2. If these candidates are at the distance of NGC 2784, then they have absolute magnitudes greater than mag and effective radii larger than 170 pc. Their radial number density decreases exponentially with distance from the center of NGC 2784 until it flattens beyond a radius of 0.5 Mpc. We interpret the baseline density level to represent the background contamination and estimate that 22 of the 31 new candidates are dwarf members of the group. The candidate's average color, , and Sérsic structural parameters are consistent with those parameters for the dwarf populations of other groups. We find that the central population of dwarfs is redder and brighter than the rest of the population. The measured faint-end slope of the luminosity function, , is steeper than that of the Local Group, but consistent with published results for other groups. Such comparisons are complicated by systematic differences among different studies, but will be simpler when the KMTNet survey, which will provide homogenous data for 15–20 groups, is completed.This publication has 47 references indexed in Scilit:
- THE EXTENDED HALO OF CENTAURUS A: UNCOVERING SATELLITES, STREAMS, AND SUBSTRUCTURES*The Astrophysical Journal, 2016
- EIGHT ULTRA-FAINT GALAXY CANDIDATES DISCOVERED IN YEAR TWO OF THE DARK ENERGY SURVEYThe Astrophysical Journal, 2015
- EIGHT NEW MILKY WAY COMPANIONS DISCOVERED IN FIRST-YEAR DARK ENERGY SURVEY DATAThe Astrophysical Journal, 2015
- A COMPREHENSIVE ANALYSIS OF UNCERTAINTIES AFFECTING THE STELLAR MASS-HALO MASS RELATION FOR 0 <z< 4The Astrophysical Journal, 2010
- Galactic stellar haloes in the CDM modelMonthly Notices of the Royal Astronomical Society, 2010
- DISCOVERY OF NEW DWARF GALAXIES IN THE M81 GROUPThe Astronomical Journal, 2009
- The ACS Virgo Cluster Survey. VI. Isophotal Analysis and the Structure of Early‐Type GalaxiesThe Astrophysical Journal Supplement Series, 2006
- The HIPASS catalogue — III. Optical counterparts and isolated dark galaxiesMonthly Notices of the Royal Astronomical Society, 2005
- The effects of photoionization on galaxy formation - I. Model and results atz=0Monthly Notices of the Royal Astronomical Society, 2002
- SExtractor: Software for source extractionAstronomy and Astrophysics Supplement Series, 1996