Existence of Tidal Tails for the Globular Cluster NGC 5824

Abstract

Context. Several dynamically cold streams have been associated with certain globular clusters (GCs) based on orbital energies and angular momenta. Some of these streams are surprisingly far apart from their progenitors and one such pair is Triangulum and NGC 5824. Triangulum can be considered as a piece of NGC 5824 leading tail since the cluster's future orbit matches with the stream's track well. The existence of the leading tail for NGC 5824 is the motivation behind the search for its trailing tail. Aims. Our goal is to confirm the connection between Triangulum and NGC 5824 and seek the trailing tail of the cluster. Methods. The selection of member stars of Triangulum is made through various cuts in metallicity, proper motions (PMs), radial velocity and color-magnitude diagram (CMD). The selected members are compared in phase space to a mock stream which models the disruption of NGC 5824. We then try to detect the trailing tail of the cluster based on a modified matched-filter technique. Stars are assigned weights using their color differences from the cluster's locus in CMD. These weights are further scaled based on stars' departures from expected PMs of the model stream. Results. A total of 26 member stars for Triangulum are obtained and 16 of them are newly identified. These members are consistent with the mock stream in the phase space and their metalicity and position on the CMD are in good agreements with NGC 5824. By applying the matched-filter, a tenuous trailing tail of the cluster is detected, spanning $\sim$ 50${}^{\circ }$ long on sky. The signature matches with the mock stream's trajectory well. Conclusions. Our results support that Triangulum stream acts as a part of the leading tail for NGC 5824. On the trailing side, we have detected a 50${}^{\circ }$ tail extended from the cluster. The existence of both leading and trailing tails for the GC NGC 5824 is verified.

Accepted for publication in A&A

References in corpus (30)

• The mass distribution and gravitational potential of the Milky Way
• Gaia Early Data Release 3: Parallax bias versus magnitude, colour, and position
• Gaia Early Data Release 3: Photometric content and validation
• Gaia EDR3 view on Galactic globular clusters
• The accretion origin of the Milky Way's stellar halo
• The Milky Way's circular velocity curve between 4 and 14 kpc from APOGEE data
• "Skinny Milky Way, Please", says Sagittarius
• Rings and Radial Waves in the Disk of the Milky Way
• The shape of the inner Milky Way halo from observations of the Pal 5 and GD-1 stellar streams
• Charting the Galactic acceleration field I. A search for stellar streams with Gaia DR2 and EDR3 with follow-up from ESPaDOnS and UVES
• Discovery of a New, Polar-Orbiting Debris Stream in the Milky Way Stellar Halo
• A Synoptic Map of Halo Substructures from the Pan-STARRS1 3π Survey
• The PAndAS Field of Streams: stellar structures in the Milky Way halo toward Andromeda and Triangulum
• $S^5$: The Orbital and Chemical Properties of One Dozen Stellar Streams
• Dipping Our Toes in the Water: First Models of GD-1 as a Stream
• Discovery of a cold stellar stream in the ATLAS DR1 data
• Orbital Clustering Identifies the Origins of Galactic Stellar Streams
• Galactic halo stellar structures in the Triangulum-Andromeda region
• A Milky Way with a massive, centrally concentrated thick disc: new Galactic mass models for orbit computations
• A Catalog of Moving Group Candidates in The Solar Neighborhood
• Exploring Halo Substructure with Giant Stars: The Nature of the Triangulum-Andromeda Stellar Features
• Estimation of distances to stars with stellar parameters from LAMOST
• Tracing Kinematic and Chemical Properties of Sagittarius Stream by K-Giants, M-Giants, and BHB stars
• The Complexity of the Cetus Stream Unveiled from the Fusion of STREAMFINDER and StarGO
• Stellar Stream Candidates in the Solar Neighborhood Found in the LAMOST DR3 and TGAS
• Extended Tidal Tails of IC 4756 detected by {\it Gaia} EDR3
• The tidal stream generated by the globular cluster NGC 3201
• The search for extratidal star candidates around Galactic globular clusters NGC 2808, NGC 6266, and NGC 6397 with {\textit{Gaia}} DR2 astrometry
• Two Portions of Sagittarius Stream in the LAMOST Complete Spectroscopic Survey of Pointing Area at Southern Galactic Cap
• Revisit NGC 5466 Tidal Stream with $Gaia$, SDSS/SEGUE and LAMOST

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