A new distant Milky Way globular cluster in the Pan-STARRS1 3π survey

Abstract

We present a new satellite in the outer halo of the Galaxy, the first Milky Way satellite found in the stacked photometric catalog of the Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS1) Survey. From follow-up photometry obtained with WFI on the MPG/ESO 2.2m telescope, we argue that the object, located at a heliocentric distance of 145+/-17 kpc, is the most distant Milky Way globular cluster yet known. With a total magnitude of M_V=-4.3+/-0.2 and a half-light radius of 20+/-2 pc, it shares the properties of extended globular clusters found in the outer halo of our Galaxy and the Andromeda galaxy. The discovery of this distant cluster shows that the full spatial extent of the Milky Way globular cluster system has not yet been fully explored.

arXiv comment6 pages, 4 figures, accepted

References in corpus (36)

• 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
• The observed properties of dwarf galaxies in and around the Local Group
• Astrometry.net: Blind astrometric calibration of arbitrary astronomical images
• The Pan-STARRS1 Photometric System
• Cats and Dogs, Hair and A Hero: A Quintet of New Milky Way Companions
• A comprehensive Maximum Likelihood analysis of the structural properties of faint Milky Way satellites
• The ACS Survey of Galactic Globular Clusters. IX. Horizontal Branch Morphology and the Second Parameter Phenomenon
• A New Milky Way Companion: Unusual Globular Cluster or Extreme Dwarf Satellite?
• Photometric Calibration of the First 1.5 Years of the Pan-STARRS1 Survey
• The properties of Galactic globular cluster sub-systems
• Assessing the Milky Way Satellites Associated with the Sagittarius Dwarf Spheroidal Galaxy
• A quantitative explanation of the observed population of Milky Way satellite galaxies
• Comparing the properties of local globular cluster systems: implications for the formation of the Galactic halo
• Globular clusters in the outer Galactic halo: new HST/ACS imaging of 6 globular clusters and the Galactic globular cluster age-metallicity relation
• The SLUGGS Survey: Kinematics for over 2500 Globular Clusters in Twelve Early-type Galaxies
• Big fish, small fish: Two New Ultra-Faint Satellites of the Milky Way
• The Invisibles: A Detection Algorithm to Trace the Faintest Milky Way Satellites
• Evidence for an accretion origin for the outer halo globular cluster system of M31
• A new population of extended, luminous star clusters in the halo of M31
• Star Clusters in M31: V. Internal Dynamical Trends: Some Troublesome, Some Reassuring
• The discovery of two extremely low luminosity Milky Way globular clusters
• Tidal Signatures in the Faintest Milky Way Satellites: The Detailed Properties of Leo V, Pisces II and Canes Venatici II
• ATLAS lifts the Cup: Discovery of a New Milky Way satellite in Crater
• ACS photometry of extended, luminous globular clusters in the outskirts of M31
• Exploring the Properties of the M31 Halo Globular Cluster System
• A new Milky Way halo star cluster in the Southern Galactic Sky
• Perseus I: A distant satellite dwarf galaxy of Andromeda
• Globular Clusters in the Outer Galactic Halo: AM-1 and Palomar 14
• The Southern Dwarf Hunt: Local Group Dwarf Candidates in the Southern Sky
• The Pan-STARRS1 Small Area Survey 2
• The M33 Globular Cluster System with PAndAS Data: The Last Outer Halo Cluster?
• Faint BVRI Photometric Sequences in Selected Fields
• Discovery of the most isolated globular cluster in the local universe
• A peculiar faint satellite in the remote outer halo of M31

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• Probing the boundary between star clusters and dwarf galaxies: A MUSE view on the dynamics of Crater/Laevens I
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