The M101 Satellite Luminosity Function and the Halo to Halo Scatter Among Local Volume Hosts

Abstract

We have obtained deep Hubble Space Telescope (HST) imaging of 19 dwarf galaxy candidates in the vicinity of M101. Advanced Camera for Surveys HST photometry for 2 of these objects showed resolved stellar populations and Tip of the Red Giant Branch derived distances consistent with M101 group membership. The other 17 were found to have no resolved stellar populations, meaning they are background low surface brightness (LSB) galaxies. It is notable that many LSB objects which had previously been assumed to be M101 group members based on projection have been shown to be background objects, indicating the need for future diffuse dwarf surveys to be careful in drawing conclusions about group membership without robust distance estimates. In this work we update the satellite luminosity function of M101 based on the presence of these new objects down to M_V=-8.2. M101 is a sparsely populated system with only 9 satellites down to M_V~-8, as compared to 26 for M31 and 24.5\pm7.7 for the median local Milky Way (MW)-mass host. This makes M101 the sparsest group probed to this depth, though M94 is even sparser to the depth it has been examined (M_V=-9.1). M101 and M94 share several properties that mark them as unusual compared to the other local MW-mass galaxies examined: they have a sparse satellite population but also have high star forming fractions among these satellites; such properties are also found in the galaxies examined as part of the SAGA survey. We suggest that these properties appear to be tied to the galactic environment, with more isolated galaxies showing sparse satellite populations which are more likely to have had recent star formation, while those in dense environments have more satellites which tend to have no recent star formation. Overall our results show a level of halo-to-halo scatter between galaxies of similar mass that is larger than is predicted in the \LambdaCDM model.

arXiv comment23 pages, 10 figures, accepted by ApJ

References in corpus (98)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Astropy: A Community Python Package for Astronomy
• Planck 2015 results. XIII. Cosmological parameters
• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• On the variation of the Initial Mass Function
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• 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
• Small-Scale Challenges to the $\Lambda$CDM Paradigm
• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• The SBF Survey of Galaxy Distances. IV. SBF Magnitudes, Colors, and Distances
• A new generation of PARSEC-COLIBRI stellar isochrones including the TP-AGB phase
• WFPC2 Stellar Photometry with HSTphot
• Mass models of the Milky Way
• The Milky Way's bright satellites as an apparent failure of LCDM
• The SDSS View of the Palomar-Green Bright Quasar Survey
• Reconciling dwarf galaxies with LCDM cosmology: Simulating a realistic population of satellites around a Milky Way-mass galaxy
• The APOSTLE simulations: solutions to the Local Group's cosmic puzzles
• Beasts of the Southern Wild: Discovery of nine Ultra Faint satellites in the vicinity of the Magellanic Clouds
• Updated Nearby Galaxy Catalog
• Eight Ultra-faint Galaxy Candidates Discovered in Year Two of the Dark Energy Survey
• Forty-Seven Milky Way-Sized, Extremely Diffuse Galaxies in the Coma Cluster
• A comprehensive Maximum Likelihood analysis of the structural properties of faint Milky Way satellites
• A Vast Thin Plane of Co-rotating Dwarf Galaxies Orbiting the Andromeda Galaxy
• Hundreds of Milky Way Satellites? Luminosity Bias in the Satellite Luminosity Function
• The Luminosity Function of the Milky Way Satellites
• The VPOS: a vast polar structure of satellite galaxies, globular clusters and streams around the Milky Way
• Not so lumpy after all: modeling the depletion of dark matter subhalos by Milky Way-like galaxies
• The Extragalactic Distance Database: Color-Magnitude Diagrams
• The SAGA Survey: I. Satellite Galaxy Populations Around Eight Milky Way Analogs
• A Baryonic Solution to the Missing Satellites Problem
• Sagittarius II, Draco II and Laevens 3: three new Milky Way satellites discovered in the Pan-STARRS 1 3pi Survey
• There is No Missing Satellites Problem
• The feeble giant. Discovery of a large and diffuse Milky Way dwarf galaxy in the constellation of Crater
• (Almost) Dark Galaxies in the ALFALFA Survey: Isolated HI Bearing Ultra Diffuse Galaxies
• Galaxies at the extremes: Ultra-diffuse galaxies in the Virgo Cluster
• The extended halo of Centaurus A: uncovering satellites, streams, and substructures
• The Hubble flow around the CenA / M83 galaxy complex
• The hidden giant: discovery of an enormous Galactic dwarf satellite in Gaia DR2
• Galaxy groups and clouds in the Local (z~0.01) universe
• A whirling plane of satellite galaxies around Centaurus A challenges cold dark matter cosmology
• Confirmation of Faint Dwarf Galaxies in the M81 Group
• The large-scale structure of the halo of the Andromeda galaxy II. Hierarchical structure in the Pan-Andromeda Archaeological Survey
• Star formation in the nearby universe: the ultraviolet and infrared points of view
• Illuminating Low-Surface-Brightness Galaxies with the Hyper Suprime-Cam Survey
• The PAndAS view of the Andromeda satellite system - II. Detailed properties of 23 M31 dwarf spheroidal galaxies
• Hydra II: a faint and compact Milky Way dwarf galaxy found in the Survey of the Magellanic Stellar History
• Two Planes of Satellites in the Centaurus A Group
• A New Faint Milky Way Satellite Discovered in the Pan-STARRS1 3 pi Survey
• The Dearth of Neutral Hydrogen in Galactic Dwarf Spheroidal Galaxies
• Horologium II: a Second Ultra-faint Milky Way Satellite in the Horologium Constellation
• Discovery of New Dwarf Galaxies in the M81 Group
• Discovery of two neighboring satellites in the Carina constellation with MagLiteS
• First results from the Dragonfly Telephoto Array: the apparent lack of a stellar halo in the massive spiral galaxy M101
• The discovery of seven extremely low surface brightness galaxies in the field of the nearby spiral galaxy M101
• The Dragonfly Nearby Galaxies Survey. II. Ultra diffuse galaxies near the elliptical galaxy NGC 5485
• Snake in the Clouds: A new nearby dwarf galaxy in the Magellanic bridge
• A Hero's Dark Horse: Discovery of an Ultra-Faint Milky Way Satellite in Pegasus
• The faint end of the Centaurus A satellite luminosity function
• DGSAT: Dwarf Galaxy Survey with Amateur Telescopes I. Discovery of low surface brightness systems around nearby spiral galaxies
• The Next Generation Virgo Cluster Survey (NGVS). XVIII. Measurement and Calibration of Surface Brightness Fluctuation Distances for Bright Galaxies in Virgo (and Beyond)
• First results from the MADCASH Survey: A Faint Dwarf Galaxy Companion to the Low Mass Spiral Galaxy NGC 2403 at 3.2 Mpc
• Too Many, Too Few, or Just Right? The Predicted Number and Distribution of Milky Way Dwarf Galaxies
• A Lonely Giant: The Sparse Satellite Population of M94 Challenges Galaxy Formation
• Tidal Signatures in the Faintest Milky Way Satellites: The Detailed Properties of Leo V, Pisces II and Canes Venatici II
• An Ultra-Faint Galaxy Candidate Discovered in Early Data from the Magellanic Satellites Survey
• The Tip of the Red Giant Branch Distances to Type Ia Supernova Host Galaxies. IV. Color Dependence and Zero-Point Calibration
• Systematically Measuring Ultra Diffuse Galaxies (SMUDGes). I. Survey Description and First Results in the Coma Galaxy Cluster and Environs
• A Deeper Look at the New Milky Way Satellites: Sagittarius II, Reticulum II, Phoenix II, and Tucana III
• Discovery of a close pair of faint dwarf galaxies in the halo of Centaurus A
• The Dragonfly Nearby Galaxies Survey. III. The Luminosity Function of the M101 Group
• The M101 group complex: new dwarf galaxy candidates and spatial structure
• Discovery of diffuse dwarf galaxy candidates around M101
• The Next Generation Virgo Cluster Survey (NGVS). XIII. The Luminosity and Mass Function of Galaxies in the Core of the Virgo Cluster and the Contribution from Disrupted Satellites
• Discovery of a new faint dwarf galaxy associated with NGC 253
• The Extended Optical Disk of M101
• New low surface brightness dwarf galaxies in the Centaurus group
• New dwarf galaxy candidates in the Centaurus group
• Evidence for Ultra-Diffuse Galaxy `Formation' Through Galaxy Interactions
• A tidally disrupting dwarf galaxy in the halo of NGC 253
• Antlia B: A faint dwarf galaxy member of the NGC 3109 association
• Bayesian Mass Estimates of the Milky Way II: The dark and light sides of parameter assumptions
• The HI environment of the M101 group
• Structure and stellar content of dwarf galaxies. III: B and R photometry of dwarf galaxies in the M101 group and the nearby field
• New Low Surface Brightness Dwarf Galaxies Detected Around Nearby Spirals
• Using Surface Brightness Fluctuations to Study Nearby Satellite Galaxy Systems: Calibration and Methodology
• Dwarf Galaxy Discoveries from the KMTNet Supernova Program I. The NGC 2784 Galaxy Group
• A Comprehensive Archival Search for Counterparts to Ultra-Compact High Velocity Clouds: Five Local Volume Dwarf Galaxies
• Deep Subaru Hyper Suprime-Cam observations of Milky Way satellites Columba I and Triangulum II
• New distances of unresolved dwarf elliptical galaxies in the vicinity of the Local Group
• Two Local Volume Dwarf Galaxies Discovered in 21 cm Emission: Pisces A and B
• The Distance to M101 Hosting Type Ia SN 2011fe Based on the Tip of the Red Giant Branch
• Using Surface Brightness Fluctuations to Study Nearby Satellite Galaxy Systems: the Complete Satellite System of M101
• d1005+68: A New Faint Dwarf Galaxy in the M81 Group
• The Globular Cluster System of NGC 5128: Ages, Metallicities, Kinematics, and Structural Parameters

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• The Luminosity Functions and Redshift Evolution of Satellites of Low-Mass Galaxies in the COSMOS Survey
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• A census of dwarf galaxy satellites around LMC-mass galaxy NGC 2403
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• An Accurate Comprehensive Approach to Substructure: III. Masses and Formation Times of the Host Haloes
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• The Exploration of Local VolumE Satellites (ELVES) Survey: A Nearly Volume-Limited Sample of Nearby Dwarf Satellite Systems
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