Black hole mergers from an evolving population of globular clusters by Fragione, G, Kocsis, B

“…One possibility is the dynamical channel, in which binary formation and hardening is catalyzed by dynamical encounters in globular clusters (GCs). Previous studies have shown that the BH merger rate from the present day GC density in the Universe is lower than the observed rate. …”

Globular Clusters in NGC 4839 Falling into Coma: Evidence for the Second Infall? by Seong-A Oh, Myung Gyoon Lee, In Sung Jang

“…We present a wide field study of globular clusters (GCs) in NGC 4839 and its environment based on Hyper Suprime-Cam gr images in the Subaru archive. …”
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Is the M81 Fast Radio Burst Host Globular Cluster Special? by Kristen C. Dage, Arash Bahramian, Clancy W. James, Arunav Kundu, Katherine L. Rhode, Jay Strader, Enrico Vesperini, Stephen E. Zepf

“…We use multiband archival Hubble Space Telescope (HST) observations to measure the photometric and structural parameters of the M81 globular cluster (GC) that hosts the fast radio burst FRB 20200120E. …”
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Searching for New Globular Clusters in M31 with Gaia EDR3 by Yilun Wang, Haibo Yuan, Bingqiu Chen, Xinlei Chen, Hao Wu, Zexi Niu, Song Huang, Jifeng Liu

“…We have found 50 new globular cluster (GC) candidates around M31 with Gaia Early Data Release 3 (EDR3), with the help of Pan-STARRS1 DR1 magnitudes and Pan-Andromeda Archaeological Survey (PAndAS) images. …”
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Radial Color Gradient in a Globular Cluster 1. M68 by Sukyoung Yi, Mun-Suk Chun

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A Photometric Survey of Globular Cluster Systems in Brightest Cluster Galaxies by William E. Harris

“…Hubble Space Telescope imaging for 26 giant early-type galaxies, all drawn from the MAST archive, is used to carry out photometry of their surrounding globular cluster (GC) systems. Most of these targets are Brightest Cluster Galaxies and their distances range from 24–210 Mpc. …”
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Fast-rotating Blue Straggler Stars in the Globular Cluster NGC 3201 by Alex Billi, Francesco R. Ferraro, Alessio Mucciarelli, Barbara Lanzoni, Mario Cadelano, Lorenzo Monaco, Mario Mateo, John I. Bailey III, Megan Reiter, Edward W. Olszewski

“…We used high-resolution spectra acquired with the Magellan Telescope to measure radial and rotational velocities of approximately 200 stars in the Galactic globular cluster NGC 3201. The surveyed sample includes blue straggler stars (BSSs) and reference stars in different evolutionary stages (main-sequence turnoff, subgiant, red giant, and asymptotic giant branches). …”
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RR Lyrae Stars Belonging to the Candidate Globular Cluster Patchick 99 by Evan Butler, Andrea Kunder, Zdenek Prudil, Kevin R. Covey, Macy Ball, Carlos Campos, Kaylen Gollnick, Julio Olivares Carvajal, Joanne Hughes, Kathryn Devine, Christian I. Johnson, A. Katherina Vivas, R. Michael Rich, Meridith Joyce, Iulia T. Simion, Tommaso Marchetti, Andreas J. Koch-Hansen, William I. Clarkson, Rebekah Kuss

“…Patchick 99 is a candidate globular cluster located in the direction of the Galactic bulge, with a proper motion almost identical to the field and extreme field star contamination. …”
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Distinguishing Dark Matter Cusps from Cores Using Globular Clusters by Shaunak Modak, Shany Danieli, Jenny E. Greene

“…Globular clusters (GCs) provide valuable insight into the properties of their host galaxies’ dark matter halos. …”
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Metallicity of Globular Cluster M13 from VI CCD Photometry by Young-Jong Sohn

“…From the shapes of red giant branch, the magnitude of horizontal branch, and the giant branch bump on the constructed CMD, we determined the metallicity of the globular cluster to be 1.74 ~<[Fe/H]~< -1.41. The good agreement between our determination of [Fe/H] and those determined by using other methods implies that the morphology of red giant and horizontal branches on (V-I)-V CMD's can be good indirect metallicity indicators of Galactic globular clusters.…”
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The Metallicity Variations Along the Chromosome Maps: The Globular Cluster 47 Tucanae by A. F. Marino, A. P. Milone, E. Dondoglio, A. Renzini, G. Cordoni, H. Jerjen, A. Karakas, E. P. Lagioia, M. V. Legnardi, M. McKenzie, A. Mohandasan, M. Tailo, D. Yong, T. Ziliotto

“…The “chromosome maps” (ChMs) of globular clusters (GCs) have revealed that these ancient structures are inhomogeneous in metallicity in various ways and in different natures. …”
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Constraining Co-Varying Coupling Constants from Globular Cluster Age by Rajendra P. Gupta

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Metallicity of Globular Cluster NGC 5053 from VI CCD Photometry by Young-Jong Sohn

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Near-Infrared Photometry of Metal Rich Globular Cluster M71 by Jae-Mann Kyeong, Yong-Ik Byun, Mun-Suk Chun

“…We have carried out JK near-infrared photometry for the central region of the metal rich globular cluster M71, whose(K, J - K) color-magnitude diagram is presented here. …”
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On the Reionization-era Globular Cluster in the Low-mass Galaxy Eridanus II by Daniel R. Weisz, Alessandro Savino, Andrew E. Dolphin

“…Using color–magnitude diagrams from deep archival Hubble Space Telescope imaging, we self-consistently measure the star formation history of Eridanus II (Eri II ), the lowest-mass galaxy ( M _⋆ ( z = 0) ∼ 10 ^5 M _⊙ ) known to host a globular cluster (GC), and the age, mass, and metallicity of its GC. …”
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Discovery of Astrometric Accelerations by Dark Companions in the Globular Cluster ω Centauri by Imants Platais, Johannes Sahlmann, Léo Girardi, Vera Kozhurina-Platais, Sebastian Kamann, Dimitri Pourbaix, Florence Wragg, Gerard Lemson, Arik Mitschang

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The Spectacular Tidal Tails of Globular Cluster M3 (NGC 5272) by Yong Yang, Jing-Kun Zhao, Xin-Zhe Tang, Xian-Hao Ye, Gang Zhao

“…We provide a detailed analysis of the tidal tails of the globular cluster M3 (NGC 5272). We first discover clear extratidal structures with a slight S shape near the cluster. …”
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Runaway and Hypervelocity Stars from Compact Object Encounters in Globular Clusters by Tomás Cabrera, Carl L. Rodriguez

“…The dense environments in the cores of globular clusters (GCs) facilitate many strong dynamical encounters among stellar objects. …”
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Photoelectric Vilnius photometry of stars in the area of the globular cluster M15 by Vansevičius V.

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Prospects for Detecting Fast Radio Bursts in the Globular Clusters of Nearby Galaxies by Kyle Kremer, Dongzi Li, Wenbin Lu, Anthony L. Piro, Bing Zhang

“…The recent detection of a repeating fast radio burst (FRB) in an old globular cluster in M81 challenges traditional FRB formation mechanisms based on the magnetic activity of young neutron stars formed in core-collapse supernovae. …”
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