Discovery of New Dwarf Galaxy near The Isolated Spiral Galaxy NGC 6503

Abstract

We report the discovery of a new dwarf galaxy (NGC6503-d1) during the Subaru extended ultraviolet (XUV) disk survey. It is a likely companion of the spiral galaxy NGC6503. The resolved images, in B, V, R, i, and Halpha, show an irregular appearance due to bright stars with underlying, smooth and unresolved stellar emission. It is classified as the transition type (dIrr/dSph). Its structural properties are similar to those of the dwarfs in the Local Group, with a V absolute magnitude ~ -10.5, half-light radius ~400 pc, and central surface brightness ~25.2. Despite the low stellar surface brightness environment, one HII region was detected, though its Halpha luminosity is low, indicating an absence of any appreciable O-stars at the current epoch. The presence of multiple stellar populations is indicated by the color-magnitude diagram of ~300 bright resolved stars and the total colors of the dwarf, with the majority of its total stellar mass ~4x10^6 Msun in an old stellar population.

arXiv commentPublished in ApJL (ApJ, 802, L24). 7 pages, 4 figures

References in corpus (40)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• PARSEC: stellar tracks and isochrones with the PAdova and TRieste Stellar Evolution Code
• Starburst99: Synthesis Models for Galaxies with Active Star Formation
• Dark Matter Substructure in Galactic Halos
• Detailed Structural Decomposition of Galaxy Images
• Where are the missing galactic satellites?
• The observed properties of dwarf galaxies in and around the Local Group
• Star Formation Histories, Abundances and Kinematics of Dwarf Galaxies in the Local Group
• The Pan-STARRS1 Photometric System
• The GALEX Ultraviolet Atlas of Nearby Galaxies
• The Milky Way's bright satellites as an apparent failure of LCDM
• Subaru Prime Focus Camera -- Suprime-Cam --
• Improving PARSEC models for very low mass stars
• New PARSEC evolutionary tracks of massive stars at low metallicity: testing canonical stellar evolution in nearby star forming dwarf galaxies
• An H-alpha Imaging Survey of Galaxies in the Local 11 Mpc Volume
• The Haunted Halos of Andromeda and Triangulum: A panorama of galaxy formation in action
• A Search for Extended Ultraviolet Disk (XUV-disk) Galaxies in the Local Universe
• Photometric Calibration of the First 1.5 Years of the Pan-STARRS1 Survey
• The ACS Nearby Galaxy Survey Treasury VIII. The Global Star Formation Histories of 60 Dwarf Galaxies in the Local Volume
• The size - virial radius relation of galaxies
• The Pan-STARRS 1 Photometric Reference Ladder, Release 12.0
• The Baryon Content of Extremely Low Mass Dwarf Galaxies
• Color--Mass-to-Light Ratio Relations for Disk Galaxies
• Modeling the Effects of Star Formation Histories on Halpha and Ultra-Violet Fluxes in Nearby Dwarf Galaxies
• Ionizing Photon Emission Rates from O- and Early B-type Stars and Clusters
• SLUG - Stochastically Lighting Up Galaxies I: Methods and Validating Tests
• PAndAS' progeny: extending the M31 dwarf galaxy cabal
• GHASP : An Halpha kinematic survey of spiral and irregular galaxies - VI. New Halpha data cubes for 108 galaxies
• Local galaxy flows within 5 Mpc
• Small-Scale Structure in the SDSS and LCDM: Isolated L* Galaxies with Bright Satellites
• The discovery of seven extremely low surface brightness galaxies in the field of the nearby spiral galaxy M101
• Discovery of a close pair of faint dwarf galaxies in the halo of Centaurus A
• Discovery of a new faint dwarf galaxy associated with NGC 253
• The Universal Initial Mass Function In The XUV Disk of M83
• Aperture Synthesis Observations of the Nearby Spiral NGC 6503: Modeling the Thin and Thick HI Disks
• Two Local Volume Dwarf Galaxies Discovered in 21 cm Emission: Pisces A and B
• Re-calibration of SDF/SXDS Photometric Catalogs of Suprime-Cam with SDSS Data Release 8
• Star formation in the extended gaseous disk of the isolated galaxy CIG 96
• GHOSTS I: A New Faint very Isolated Dwarf Galaxy at D = 12 +/- 2 Mpc

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• WALLABY Pilot Survey: Hydra Cluster Galaxies UV and HI morphometrics
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