A Search for Extra-Tidal RR Lyrae in the Globular Cluster NGC 5024 and NGC 5053

Abstract

Recently, Kundu et al (2019) reported that the globular cluster NGC 5024 (M53) possesses five extra-tidal RR Lyrae. In fact, four of them were instead known members of a nearby globular cluster NGC 5053. The status of the remaining extra-tidal RR Lyrae is controversial depending on the adopted tidal radius of NGC 5024. We have also searched for additional extra-tidal RR Lyrae within an area of $\sim 8$~deg${}^2$ covering both globular clusters. This includes other known RR Lyrae within the search area, as well as stars that fall within the expected range of magnitudes and colors for RR Lyrae (and yet outside the cutoff of 2/3 of the tidal radii of each globular clusters for something to be called "extra-tidal") if they were extra-tidal RR Lyrae candidates for NGC 5024 or NGC 5053. Based on the the proper motion information and their locations on the color-magnitude diagram, none of the known RR Lyrae belong to the extra-tidal RR Lyrae of either globular clusters. In the cases where the stars satisfied the magnitude and color ranges of RR Lyrae, analysis of time series data taken from the Zwicky Transient Facility do not reveal periodicities, suggesting that none of these stars are RR Lyrae. We conclude that there are no extra-tidal RR Lyrae associated with either NGC 5024 or NGC 5053 located within our search area.

arXiv comment17 pages, 2 Tables, 12 Figures, AJ accepted

References in corpus (44)

• Astropy: A Community Python Package for Astronomy
• Gaia Data Release 2. Summary of the contents and survey properties
• The Gaia mission
• Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The Zwicky Transient Facility: Data Processing, Products, and Archive
• The Zwicky Transient Facility: Science Objectives
• astroquery: An Astronomical Web-Querying Package in Python
• Dynamical evolution of star clusters in tidal fields
• Resolved Massive Star Clusters in the Milky Way and its Satellites: Brightness Profiles and a Catalogue of Fundamental Parameters
• Global survey of star clusters in the Milky Way II. The catalogue of basic parameters
• Gaia Data Release 2: Kinematics of globular clusters and dwarf galaxies around the Milky Way
• Detection of massive tidal tails around the globular cluster Pal 5 with SDSS commissioning data
• Variable Stars in Galactic Globular Clusters
• The Zwicky Transient Facility: Observing System
• The QUEST RR Lyrae Survey: Confirmation of the Clump at 50 kpc and Other Over-Densities in the Outer Halo
• Modeling the disruption of the globular cluster Pal5 by Galactic tides
• The Discovery of Tidal Tails Around NGC 5466
• Machine-Learned Identification of RR Lyrae Stars from Sparse, Multi-band Data: the PS1 Sample
• The QUEST RR Lyrae Survey II: The Halo Overdensities in the First Catalog
• Search for Extratidal Features Around 17 Globular Clusters in the Sloan Digital Sky Survey
• Globular cluster number density profiles using Gaia DR2
• Discovery of tidal tails around the distant globular cluster Palomar 14
• Tidal tails around globular clusters. Are they a good tracer of cluster orbits?
• Formation and evolution of clumpy tidal tails around globular clusters
• Exploring the variable stars in the globular cluster NGC5024 (M53): New RR Lyrae and SX Phoenicis stars
• Tidal tails around the outer halo globular clusters Eridanus and Palomar 15
• A wide-field photometric survey for extratidal tails around five metal-poor globular clusters in the Galactic halo
• Gaia Data Release 2: All-sky classification of high-amplitude pulsating stars
• The Tidal Tails of the Ultra-Faint Globular Cluster Palomar 1
• Detection of a 50 degree-long Trailing Tidal Tail for the Globular Cluster M5
• Kinematics of the Palomar 5 stellar stream from RR Lyrae stars
• The Tidal Tails of NGC 5466
• Feeling the pull, a study of natural Galactic accelerometers. II: kinematics and mass of the delicate stellar stream of the Palomar 5 globular cluster
• The discovery of tidal tails around the globular cluster NGC 7492 with Pan-STARRS1
• Search for Extra-Tidal RR Lyrae Stars in Milky Way Globular Clusters From Gaia DR2
• Searching for tidal tails around $\omega$ Centauri using RR Lyrae Stars
• Development of multiple tidal tails around globular clusters and dwarf satellite galaxies
• Effects of External Tidal Field on the Evolution of Multi-mass Star Clusters
• Discovery of Tidal RR LYRAE stars in the Bulge Globular Cluster M 62
• The Blue Straggler population in the globular cluster M53 (NGC5024): a combined HST, LBT, CFHT study
• RR Lyrae Variables in the Local Group Dwarf Galaxy NGC 147
• Radial velocities of RR Lyrae stars in and around NGC 6441
• Double-Mode Radial Pulsations among RR Lyrae Stars

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