Related papers: Identifying the brightest Galactic globular cluste…

VERITAS Observations of Globular Clusters

It has been postulated that globular clusters could be sources of Very-High Energy (VHE) gamma rays, powered by milli-second pulsars. This could be due to cumulative direct emission or to plerion-type emission driven by colliding winds. In…

High Energy Astrophysical Phenomena · Physics 2019-08-13 Michael McCutcheon

A Search for Intergalactic Globular Clusters in the Local Group

The whole Sloan Digital Sky Survey (SDSS, 14,555 deg^2 has been searched for intergalactic globular clusters (IGCs) in the Local Group (LG). Using optical, infrared, and ultraviolet photometric selection criteria and photometric redshifts,…

Astrophysics of Galaxies · Physics 2015-06-24 Graziella di Tullio Zinn , Robert Zinn

Discovery of new globular clusters in the Sagittarius dwarf galaxy

Context. Globular clusters (GCs) are witnesses of the past accretion events onto the Milky Way (MW). In particular, the GCs of the Sagittarius (Sgr) dwarf galaxy are important probes of an on-going merger. Aims. Our main goal is to search…

Astrophysics of Galaxies · Physics 2021-03-16 D. Minniti , V. Ripepi , J. G. Fernández-Trincado , J. Alonso-García , L. C. Smith , P. W. Lucas , M. Gómez , J. B. Pullen , E. R. Garro , F. Vivanco Cádiz , M. Hempel , M. Rejkuba , R. K. Saito , T. Palma , J. J. Clariá , M. Gregg , D. Majaess

Globular Cluster Systems in Brightest Cluster Galaxies: A Near-Universal Luminosity Function?

We present the first results from our HST Brightest Cluster Galaxy (BCG) survey of seven central supergiant cluster galaxies and their globular cluster (GC) systems. We measure a total of 48000 GCs in all seven galaxies, representing the…

Astrophysics of Galaxies · Physics 2015-06-23 William E. Harris , Warren Morningstar , Oleg Y. Gnedin , Heather O'Halloran , John P. Blakeslee , Bradley C. Whitmore , Patrick Cote , Douglas Geisler , Eric W. Peng , Jeremy Bailin , Barry Rothberg , Robert Cockcroft , Regina Barber DeGraaff

Modeling the Galactic center gamma-ray emission with more realistic cosmic-ray dynamics

Very-high-energy gamma-ray observations of the Galactic center (GC) show extended emission that is strongly correlated with the morphology of the central molecular zone (CMZ). The best explanation for that emission is a hadronic interaction…

High Energy Astrophysical Phenomena · Physics 2023-11-29 Andrés Scherer , Jorge Cuadra , Franz E. Bauer

The Analyses of Globular Clusters Pulsars and Their Detection Efficiency

Up to November 2022, 267 pulsars have been discovered in 36 globular clusters (GCs). In this paper, we present our studies on the distribution of GC pulsar parameters and the detection efficiency. The power law relation between the average…

High Energy Astrophysical Phenomena · Physics 2023-03-20 De-Jiang Yin , Li-Yun Zhang , Bao-Da Li , Ming-Hui Li , Lei Qian , Zhichen Pan

Globular Clusters around Galaxies in Groups

We have obtained deep photometry of NGC 1199 (in HCG 22) and NGC 6868 (in the Telescopium group). Both galaxies are the optically brightest galaxies of their groups. Our analysis of B and R images taken with the Keck II and the VLT/ESO…

Astrophysics · Physics 2009-11-06 C. Da Rocha , C. Mendes de Oliveira , M. Bolte , B. L. Ziegler , T. H. Puzia

The Spatial Distribution of Globular Cluster Systems in Early Type Galaxies: Estimation Procedure and Catalog of Properties for Globular Cluster Systems Observed with Deep Imaging Surveys

We present an analysis of the spatial distribution of globular cluster (GC) systems of 118 nearby early-type galaxies in the Next Generation Virgo Cluster Survey (NGVS) and Mass Assembly of early-Type GaLAxies with their fine Structures…

Astrophysics of Galaxies · Physics 2024-11-27 Sungsoon Lim , Eric W. Peng , Patrick Côté , Laura Ferrarese , Joel C. Roediger , Chengze Liu , Chelsea Spengler , Elisabeth Sola , Pierre-Alain Duc , Laura V. Sales , John P. Blakeslee , Jean-Charles Cuillandre , Patrick R. Durrell , Eric Emsellem , Stephen D. J. Gwyn , Ariane Lançon , Francine R. Marleau , J. Christopher Mihos , Oliver Müller , Thomas H. Puzia , Rubén Sánchez-Janssen

The Exotic Zoo of Millisecond Pulsars in Globular Clusters: a multi-wavelength study

This thesis work is focused on the study of millisecond pulsars in globular cluster by using multi-wavelength observations obtained with radio and optical telescopes. Radio observations have been used to search for and timing the pulsars.…

High Energy Astrophysical Phenomena · Physics 2019-01-15 M. Cadelano

A Search for Millisecond Pulsars in Fermi LAT-Detected Globular Clusters

We have searched for millisecond pulsars (MSPs) in two globular clusters detected by the Fermi Large Area Telescope. These clusters contained no known MSPs prior to their detections in gamma rays. The discovery of gamma ray emission from…

High Energy Astrophysical Phenomena · Physics 2011-11-03 Megan E. DeCesar , Scott M. Ransom , Paul S. Ray

Prospects for $\gamma$-ray observations of the Perseus galaxy cluster with the Cherenkov Telescope Array

Galaxy clusters are expected to be dark matter (DM) reservoirs and storage rooms for the cosmic-ray protons (CRp) that accumulate along the cluster's formation history. Accordingly, they are excellent targets to search for signals of DM…

High Energy Astrophysical Phenomena · Physics 2024-10-25 The Cherenkov Telescope Array Consortium , : , K. Abe , S. Abe , F. Acero , A. Acharyya , R. Adam , A. Aguasca-Cabot , I. Agudo , A. Aguirre-Santaella , J. Alfaro , R. Alfaro , N. Alvarez-Crespo , R. Alves Batista , J. -P. Amans , E. Amato , E. O. Angüner , L. A. Antonelli , C. Aramo , M. Araya , C. Arcaro , L. Arrabito , K. Asano , Y. Ascasíbar , J. Aschersleben , H. Ashkar , L. Augusto Stuani , D. Baack , M. Backes , A. Baktash , C. Balazs , M. Balbo , O. Ballester , A. Baquero Larriva , V. Barbosa Martins , U. Barres de Almeida , J. A. Barrio , P. I. Batista , I. Batkovic , R. Batzofin , J. Baxter , J. Becerra González , G. Beck , J. Becker Tjus , W. Benbow , J. Bernete Medrano , K. Bernlöhr , A. Berti , B. Bertucci , V. Beshley , P. Bhattacharjee , S. Bhattacharyya , B. Bi , N. Biederbeck , A. Biland , E. Bissaldi , J. Biteau , O. Blanch , J. Blazek , C. Boisson , J. Bolmont , P. Bordas , Z. Bosnjak , E. Bottacini , F. Bradascio , C. Braiding , E. Bronzini , R. Brose , A. M. Brown , F. Brun , G. Brunetti , N. Bucciantini , A. Bulgarelli , I. Burelli , L. Burmistrov , M. Burton , T. Bylund , P. G. Calisse , A. Campoy-Ordaz , B. K. Cantlay , M. Capalbi , A. Caproni , R. Capuzzo-Dolcetta , P. Caraveo , S. Caroff , R. Carosi , E. Carquin , M. -S. Carrasco , E. Cascone , F. Cassol , A. J. Castro-Tirado , D. Cerasole , M. Cerruti , P. Chadwick , S. Chaty , A. W. Chen , M. Chernyakova , A. Chiavassa , J. Chudoba , L. Chytka , A. Cifuentes , C. H. Coimbra Araujo , V. Conforti , F. Conte , J. L. Contreras , J. Cortina , A. Costa , H. Costantini , G. Cotter , P. Cristofari , O. Cuevas , Z. Curtis-Ginsberg , G. D'Amico , F. D'Ammando , M. Dalchenko , F. Dazzi , M. de Bony de Lavergne , V. De Caprio , F. De Frondat Laadim , E. M. de Gouveia Dal Pino , B. De Lotto , M. De Lucia , D. De Martino , R. de Menezes , M. de Naurois , N. De Simone , V. de Souza , M. V. del Valle , E. Delagnes , A. G. Delgado Giler , C. Delgado , M. Dell'aiera , D. della Volpe , D. Depaoli , T. Di Girolamo , A. Di Piano , F. Di Pierro , R. Di Tria , L. Di Venere , S. Diebold , A. Djannati-Ataï , J. Djuvsland , R. M. Dominik , A. Donini , D. Dorner , J. Dörner , M. Doro , R. D. C. dos Anjos , J. -L. Dournaux , C. Duangchan , C. Dubos , D. Dumora , V. V. Dwarkadas , J. Ebr , C. Eckner , K. Egberts , S. Einecke , D. Elsässer , G. Emery , M. Escobar Godoy , J. Escudero , P. Esposito , S. Ettori , C. Evoli , D. Falceta-Goncalves , V. Fallah Ramazani , A. Fattorini , A. Faure , E. Fedorova , S. Fegan , K. Feijen , Q. Feng , G. Ferrand , F. Ferrarotto , E. Fiandrini , A. Fiasson , M. Filipovic , V. Fioretti , L. Foffano , L. Font Guiteras , G. Fontaine , S. Fröse , Y. Fukazawa , Y. Fukui , D. Gaggero , G. Galanti , S. Gallozzi , V. Gammaldi , M. Garczarczyk , C. Gasbarra , D. Gasparrini , M. Gaug , A. Ghalumyan , F. Gianotti , M. Giarrusso , J. Giesbrecht , N. Giglietto , F. Giordano , J. -F. Glicenstein , H. Göksu , P. Goldoni , J. M. González , M. M. González , J. Goulart Coelho , J. Granot , R. Grau , L. Gréaux , D. Green , J. G. Green , I. Grenier , G. Grolleron , J. Grube , O. Gueta , J. Hackfeld , D. Hadasch , P. Hamal , W. Hanlon , S. Hara , V. M. Harvey , T. Hassan , L. Heckmann , M. Heller , S. Hernández Cadena , O. Hervet , J. Hie , N. Hiroshima , B. Hnatyk , R. Hnatyk , J. Hoang , D. Hoffmann , W. Hofmann , J. Holder , D. Horan , P. Horvath , D. Hrupec122 , M. Hütten , M. Iarlori , T. Inada , F. Incardona , S. Inoue , F. Iocco , M. Iori , M. Jamrozy , P. Janecek , F. Jankowsky , C. Jarnot , P. Jean , I. Jiménez Martínez , W. Jin , C. Juramy-Gilles , J. Jurysek , M. Kagaya , D. Kantzas , V. Karas , H. Katagiri , J. Kataoka , S. Kaufmann , D. Kerszberg , B. Khélifi , R. Kissmann , T. Kleiner , G. Kluge , W. Kluźniak , J. Knödlseder , Y. Kobayashi , K. Kohri , N. Komin , P. Kornecki , K. Kosack , G. Kowal , H. Kubo , J. Kushida , A. La Barbera , N. La Palombara , M. Láinez , A. Lamastra , J. Lapington , P. Laporte , S. Lazarević , F. Leitgeb , M. Lemoine-Goumard , J. -P. Lenain , F. Leone , G. Leto , F. Leuschner , E. Lindfors , M. Linhoff , I. Liodakis , S. Lombardi , F. Longo , R. López-Coto , M. López-Moya , A. López-Oramas , S. Loporchio , P. L. Luque-Escamilla , O. Macias , J. Mackey , P. Majumdar , D. Malyshev , D. Mandat , M. Manganaro , G. Manicò , M. Mariotti , S. Markoff , I. Márquez , P. Marquez , G. Marsella , G. A. Martínez , M. Martínez , O. Martinez , C. Marty , A. Mas-Aguilar , M. Mastropietro , G. Maurin , D. Mazin , D. Melkumyan , A. J. T. S. Mello , J. -L. Meunier , D. M. -A. Meyer , M. Meyer , D. Miceli , M. Michailidis , J. Michałowski , T. Miener , J. M. Miranda , A. Mitchell , M. Mizote , T. Mizuno , R. Moderski , M. Molero , C. Molfese , E. Molina , T. Montaruli , D. Morcuende , K. Morik , G. Morlino , A. Morselli , E. Moulin , V. Moya Zamanillo , K. Munari , T. Murach , A. Muraczewski , H. Muraishi , S. Nagataki , T. Nakamori , R. Nemmen , N. Neyroud , L. Nickel , J. Niemiec , D. Nieto , M. Nievas Rosillo , M. Nikołajuk , K. Nishijima , K. Noda , D. Nosek , V. Novotny , S. Nozaki , P. O'Brien , M. Ohishi , Y. Ohtani , A. Okumura , J. -F. Olive , B. Olmi , R. A. Ong , M. Orienti , R. Orito , M. Orlandini , E. Orlando , M. Ostrowski , I. Oya , A. Pagliaro , M. Palatiello , G. Panebianco , D. Paneque , F. R. Pantaleo , R. Paoletti , J. M. Paredes , N. Parmiggiani , S. R. Patel , B. Patricelli , D. Pavlović , M. Pech , M. Pecimotika , U. Pensec , M. Peresano , J. Pérez-Romero , G. Peron , M. Persic , P. -O. Petrucci , O. Petruk , G. Piano , E. Pierre , E. Pietropaolo , F. Pintore , G. Pirola , S. Pita , C. Plard , F. Podobnik , M. Pohl , M. Polo , E. Pons , G. Ponti , E. Prandini , J. Prast , G. Principe , C. Priyadarshi , N. Produit , E. Pueschel , G. Pühlhofer , M. L. Pumo , M. Punch , F. Queiroz , A. Quirrenbach , S. Rainò , R. Rando , S. Razzaque , S. Recchia , M. Regeard , P. Reichherzer , A. Reimer , O. Reimer , A. Reisenegger , W. Rhode , D. Ribeiro , M. Ribó , T. Richtler , J. Rico , F. Rieger , C. Righi , L. Riitano , V. Rizi , E. Roache , G. Rodriguez Fernandez , J. J. Rodríguez-Vázquez , P. Romano , G. Romeo , J. Rosado , A. Rosales de Leon , G. Rowell , B. Rudak , C. B. Rulten , F. Russo , I. Sadeh , L. Saha , T. Saito , H. Salzmann , D. Sanchez , M. Sánchez-Conde , P. Sangiorgi , H. Sano , M. Santander , A. Santangelo , R. Santos-Lima , A. Sanuy , T. Šarić , A. Sarkar , S. Sarkar , K. Satalecka , F. G. Saturni , V. Savchenko , A. Scherer , P. Schipani , B. Schleicher , J. L. Schubert , F. Schussler , U. Schwanke , G. Schwefer , M. Seglar Arroyo , S. Seiji , D. Semikoz , O. Sergijenko , M. Servillat , V. Sguera , R. Y. Shang , P. Sharma , H. Siejkowski , A. Sinha , C. Siqueira , V. Sliusar , A. Slowikowska , H. Sol , A. Specovius , S. T. Spencer , D. Spiga , A. Stamerra , S. Stanič , T. Starecki , R. Starling , Ł. Stawarz , C. Steppa , T. Stolarczyk , J. Strišković , Y. Suda , T. Suomijärvi , H. Tajima , D. Tak , M. Takahashi , R. Takeishi , S. J. Tanaka , T. Tavernier , L. A. Tejedor , K. Terauchi , R. Terrier , M. Teshima , W. W. Tian , L. Tibaldo , O. Tibolla , F. Torradeflot , D. F. Torres , E. Torresi , G. Tosti , L. Tosti , N. Tothill , F. Toussenel , V. Touzard , A. Tramacere , P. Travnicek , G. Tripodo , S. Truzzi , A. Tsiahina , A. Tutone , M. Vacula , B. Vallage , P. Vallania , C. van Eldik , J. van Scherpenberg , J. Vandenbroucke , V. Vassiliev , M. Vázquez Acosta , M. Vecchi , S. Ventura , S. Vercellone , G. Verna , A. Viana , N. Viaux , A. Vigliano , C. F. Vigorito , V. Vitale , V. Vodeb , V. Voisin , S. Vorobiov , G. Voutsinas , I. Vovk , T. Vuillaume , S. J. Wagner , R. Walter , M. Wechakama , R. White , A. Wierzcholska , M. Will , D. A. Williams , F. Wohlleben , A. Wolter , T. Yamamoto , R. Yamazaki , T. Yoshida , T. Yoshikoshi , M. Zacharias , G. Zaharijas , D. Zavrtanik , M. Zavrtanik , A. A. Zdziarski , A. Zech , V. I. Zhdanov , M. Živec , J. Zuriaga-Puig , P. De la Torre Luque

Young Massive Star Clusters as TeV Emitters: Constraints from H.E.S.S. and LHAASO

Young massive star clusters (YMSCs) have been proposed as excellent candidates for the main sources of Galactic cosmic rays (CRs) up to the PeV range. The detection and study of gamma rays in the very-high-energy (E>100GeV) range has…

High Energy Astrophysical Phenomena · Physics 2026-05-11 Rowan Batzofin , Pierre Cristofari , Kathrin Egberts

Chandra Exposes the Core Collapsed Globular Cluster NGC 6397

We report results of the Chandra deep imaging observation of the closest post-core collapse globular cluster, NGC 6397. Some 25 sources are detected within 2 arcmin of the cluster center of which about 20 are likely cluster members with L_x…

Astrophysics · Physics 2009-11-07 J. E. Grindlay , C. O. Heinke , P. D. Edmonds , S. S. Murray , A. M. Cool

New Deep Radio Continuum Imaging Still Indicates a Large Reservoir of Undiscovered Millisecond Pulsars in Terzan 5

We present the deepest and highest-resolution radio continuum imaging of the Galactic globular cluster Terzan 5, one of the most crowded locations in the radio sky. In these new 2$-$4 GHz Karl G. Jansky Very Large Array images, we detect 38…

High Energy Astrophysical Phenomena · Physics 2026-02-12 Ryan Urquhart , Jay Strader , Laura Chomiuk , Scott M. Ransom , Craig O. Heinke , Arash Bahramian , Thomas J. Maccarone

Pulse Profiles and Polarization of Terzan 5 Pulsars

Terzan 5 is a rich globular cluster within the galactic bulge that contains 39 known millisecond pulsars, the largest known population of any globular cluster. The Terzan 5 pulsars are faint, so that individual observations of most of the…

High Energy Astrophysical Phenomena · Physics 2022-12-14 Ashley R. Martsen , Scott M. Ransom , Megan E. DeCesar , Paulo C. C. Freire , Jason W. T. Hessels , Anna Y. Q. Ho , Ryan S. Lynch , Ingrid H. Stairs , Yuankun Wang

Contribution to diffuse gamma-rays in the Galactic center region from unresolved millisecond pulsars

The diffuse gamma-rays in the Galactic center region have been studied. We propose that there exists a population of millisecond pulsars (MSPs) in the Galactic Center, which will emit GeV gamma-rays through the synchrotron-curvature…

Astrophysics · Physics 2009-11-10 W. Wang , Z. J. Jiang , K. S. Cheng

Revisiting the TeV detection prospects for radio galaxies

Radio galaxies host relativistic jets oriented away from our line of sight, making them challenging targets for Very High Energy (VHE, E$>$100 GeV) $\gamma$-ray detectors. Indeed, out of $\sim100$ extragalactic sources detected at $E>100$…

High Energy Astrophysical Phenomena · Physics 2019-12-04 Roberto Angioni

UVIT Observations of UV-Bright Stars in four Galactic Globular Clusters

We have performed photometric analysis of four Galactic globular clusters (GGCs): NGC 4147, NGC 4590, NGC 5053 and NGC 7492 using far-UV and near-UV filters of the Ultraviolet Imaging Telescope (UVIT) on-board AstroSat. With the help of…

Astrophysics of Galaxies · Physics 2020-03-18 Ranjan Kumar , Ananta C. Pradhan , M. Parthasarathy , Devendra K. Ojha , Abhisek Mohapatra , Jayant Murthy

A stellar census in globular clusters with MUSE: A spectral catalogue of emission-line sources

Globular clusters produce many exotic stars due to a much higher frequency of dynamical interactions in their dense stellar environments. Some of these objects were observed together with several hundred thousands other stars in our MUSE…

Solar and Stellar Astrophysics · Physics 2019-11-06 Fabian Göttgens , Tim-Oliver Husser , Sebastian Kamann , Stefan Dreizler , Benjamin Giesers , Wolfram Kollatschny , Peter M. Weilbacher , Martin M. Roth , Martin Wendt

The Cherenkov Telescope Array Will Test Whether Pulsars Generate the Galactic Center Gamma-Ray Excess

The GeV-scale gamma-ray excess observed from the region surrounding the Galactic Center has been interpreted as either the products of annihilating dark matter particles, or as the emission from a large population of faint and…

High Energy Astrophysical Phenomena · Physics 2023-05-10 Celeste Keith , Dan Hooper , Tim Linden