Small-Scale Structure in the SDSS and LCDM: Isolated L* Galaxies with Bright Satellites

Abstract

We use a volume-limited spectroscopic sample of isolated galaxies in the Sloan Digital Sky Survey (SDSS) to investigate the frequency and radial distribution of luminous (M_r <~ -18.3) satellites like the Large Magellanic Cloud (LMC) around ~L* Milky Way analogs and compare our results object-by-object to LCDM predictions based on abundance matching in simulations. We show that 12% of Milky Way-like galaxies host an LMC-like satellite within 75 kpc (projected), and 42 % within 250 kpc (projected). This implies ~10% have a satellite within the distance of the LMC, and ~40% of L* galaxies host a bright satellite within the virialized extent of their dark matter halos. Remarkably, the simulation reproduces the observed frequency, radial dependence, velocity distribution, and luminosity function of observed secondaries exceptionally well, suggesting that LCDM provides an accurate reproduction of the observed Universe to galaxies as faint as L~10^9 Lsun on ~50 kpc scales. When stacked, the observed projected pairwise velocity dispersion of these satellites is sigma~160 km/s, in agreement with abundance-matching expectations for their host halo masses. Finally, bright satellites around L* primaries are significantly redder than typical galaxies in their luminosity range, indicating that environmental quenching is operating within galaxy-size dark matter halos that typically contain only a single bright satellite. This redness trend is in stark contrast to the Milky Way's LMC, which is unusually blue even for a field galaxy. We suggest that the LMC's discrepant color might be further evidence that it is undergoing a triggered star-formation event upon first infall.

14 pages, 11 figures; accepted to ApJ

References in corpus (17)

• Too big to fail? The puzzling darkness of massive Milky Way subhaloes
• Are the Magellanic Clouds on their First Passage about the Milky Way?
• A common mass scale for satellite galaxies of the Milky Way
• The Importance of Satellite Quenching for the Build-Up of the Red Sequence of Present Day Galaxies
• Haloes gone MAD: The Halo-Finder Comparison Project
• Hundreds of Milky Way Satellites? Luminosity Bias in the Satellite Luminosity Function
• Halo assembly bias and its effects on galaxy clustering
• Minor Galaxy Interactions: Star Formation Rates and Galaxy Properties
• The Invisibles: A Detection Algorithm to Trace the Faintest Milky Way Satellites
• Tidally Triggered Star Formation in Close Pairs of Galaxies: Major and Minor Interactions
• Dynamics of the Magellanic Clouds in a LCDM Universe
• Satellite Systems around Galaxies in Hydrodynamic Simulations
• From Galaxy Clusters to Ultra-Faint Dwarf Spheroidals: A Fundamental Curve Connecting Dispersion-supported Galaxies to Their Dark Matter Halos
• Testing gravity with motion of satellites around galaxies: Newtonian gravity against Modified Newtonian Dynamics
• The H alpha Galaxy Survey VI. Star-forming companions of nearby field galaxies
• Nearby Galaxies in More Distant Contexts
• An Improved Photometric Calibration of the Sloan Digital Sky Survey Imaging Data

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