A population of gamma-ray emitting globular clusters seen with the Fermi Large Area Telescope

A.A. Abdo; Markus Ackermann; Marco Ajello; Luca Baldini; Jean Ballet; Guido Barbiellini; D. Bastieri; R. Bellazzini; R. D. Blandford; E. D. Bloom; E. Bonamente; A. W. Borgland; A. Bouvier; T. J. Brandt; J. Bregeon; M. Brigida; Pascal Bruel; R. Buehler; S. Buson; G. A. Caliandro; R. A. Cameron; P. A. Caraveo; S. Carrigan; J. M. Casandjian; E. Charles; S. Chaty; A. Chekhtman; C. C. Cheung; J. Chiang; S. Ciprini; R. Claus; J. Cohen-Tanugi; J. Conrad; M. E. Decesar; C. D. Dermer; F. de Palma; S. W. Digel; E. Do Couto E Silva; P. S. Drell; R. Dubois; D. Dumora; C. Favuzzi; P. Fortin; M. Frailis; Y. Fukazawa; P. Fusco; F. Gargano; D. Gasparrini; N. Gehrels; S. Germani; N. Giglietto; F. Giordano; T. Glanzman; G. Godfrey; I. Grenier; M.-H. Grondin; J. E. Grove; L. Guillemot; S. Guiriec; D. Hadasch; A. K. Harding; E. Hays; P. Jean; G. Jóhannesson; T. J. Johnson; W. N. Johnson; T. Kamae; H. Katagiri; J. Kataoka; M. Kerr; Jürgen Knödlseder; M. Kuss; J. Lande; L. Latronico; S.-H. Lee; M. Lemoine-Goumard; M. Llena Garde; F. Longo; F. Loparco; M. N. Lovellette; P. Lubrano; A. Makeev; M. N. Mazziotta; P. F. Michelson; W. Mitthumsiri; T. Mizuno; C. Monte; M. E. Monzani; A. Morselli; I. V. Moskalenko; S. Murgia; M. Naumann-Godo; P. L. Nolan; J. P. Norris; E. Nuss; T. Ohsugi; N. Omodei; E. Orlando; J. F. Ormes; B. Pancrazi; D. Parent; M. Pepe; M. Pesce-Rollins; F. Piron; T.A. Porter; S. Rainò; R. Rando; A. Reimer; O. Reimer; T. Reposeur; J. Ripken; R. W. Romani; M. Roth; H. F.-W. Sadrozinski; P. M. Saz Parkinson; C. Sgrò; E. J. Siskind; David Stanley Smith; P. Spinelli; M. S. Strickman; D. J. Suson; H. Takahashi; T. Takahashi; T. Tanaka; J. B. Thayer; J. G. Thayer; L. Tibaldo; D. F. Torres; G. Tosti; A. Tramacere; Y. Uchiyama; T. L. Usher; V. Vasileiou; C. Venter; N. Vilchez; V. Vitale; A. P. Waite; P. Wang; N. Webb; B. L. Winer; Z. Yang; T. Ylinen; M. Ziegler

doi:10.1051/0004-6361/201014458

Journal Articles Astronomy and Astrophysics - A&A Year : 2010

A population of gamma-ray emitting globular clusters seen with the Fermi Large Area Telescope

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A.A. Abdo

Function : Author

Markus Ackermann

Function : Author

Marco Ajello

Function : Author

Luca Baldini

Function : Author

Jean Ballet

Function : Author

Astrophysique Interprétation Modélisation

Guido Barbiellini

Function : Author

D. Bastieri

Function : Author

R. Bellazzini

Function : Author

R. D. Blandford

Function : Author

E. D. Bloom

Function : Author

E. Bonamente

Function : Author

A. W. Borgland

Function : Author

A. Bouvier

Function : Author

T. J. Brandt

Function : Author

J. Bregeon

Function : Author
PersonId : 741214
IdHAL : johan-bregeon
ORCID : 0000-0002-6790-5328
IdRef : 095856943

M. Brigida

Function : Author

Pascal Bruel

Function : Author

Laboratoire Leprince-Ringuet

R. Buehler

Function : Author

S. Buson

Function : Author

G. A. Caliandro

Function : Author

R. A. Cameron

Function : Author

P. A. Caraveo

Function : Author

S. Carrigan

Function : Author

J. M. Casandjian

Function : Author

Astrophysique Interprétation Modélisation

E. Charles

Function : Author

S. Chaty

Function : Author

Astrophysique Interprétation Modélisation

A. Chekhtman

Function : Author

C. C. Cheung

Function : Author

J. Chiang

Function : Author

S. Ciprini

Function : Author

R. Claus

Function : Author

J. Cohen-Tanugi

Function : Author
PersonId : 3626
IdHAL : johann-cohen-tanugi
ORCID : 0000-0001-9022-4232
IdRef : 172626544

Laboratoire de Physique Théorique et Astroparticules

J. Conrad

Function : Author

M. E. Decesar

Function : Author

C. D. Dermer

Function : Author

F. de Palma

Function : Author

S. W. Digel

Function : Author

E. Do Couto E Silva

Function : Author

P. S. Drell

Function : Author

R. Dubois

Function : Author

D. Dumora

Function : Author

Centre d'Etudes Nucléaires de Bordeaux Gradignan

C. Favuzzi

Function : Author

P. Fortin

Function : Author

Laboratoire Leprince-Ringuet

M. Frailis

Function : Author

Y. Fukazawa

Function : Author
PersonId : 760581
ORCID : 0000-0002-0921-8837

P. Fusco

Function : Author

F. Gargano

Function : Author

D. Gasparrini

Function : Author

N. Gehrels

Function : Author

S. Germani

Function : Author

N. Giglietto

Function : Author
PersonId : 755413
ORCID : 0000-0002-9021-2888

F. Giordano

Function : Author

T. Glanzman

Function : Author

G. Godfrey

Function : Author

I. Grenier

Function : Author

Astrophysique Interprétation Modélisation

M.-H. Grondin

Function : Author
PersonId : 760583
ORCID : 0000-0002-8383-251X
IdRef : 14852026X

Centre d'Etudes Nucléaires de Bordeaux Gradignan

J. E. Grove

Function : Author

L. Guillemot

Function : Author

Centre d'Etudes Nucléaires de Bordeaux Gradignan

S. Guiriec

Function : Author

D. Hadasch

Function : Author
PersonId : 761675
ORCID : 0000-0001-8663-6461

A. K. Harding

Function : Author

E. Hays

Function : Author

P. Jean

Function : Author
PersonId : 755195
ORCID : 0000-0002-1757-9560
IdRef : 248231847

G. Jóhannesson

Function : Author

T. J. Johnson

Function : Author

W. N. Johnson

Function : Author

T. Kamae

Function : Author

H. Katagiri

Function : Author

J. Kataoka

Function : Author

M. Kerr

Function : Author

Jürgen Knödlseder

Function : Author
PersonId : 178646
IdHAL : jurgen-knodlseder
ORCID : 0000-0002-0014-7809
IdRef : 069521360

Centre d'étude spatiale des rayonnements

M. Kuss

Function : Author

J. Lande

Function : Author

L. Latronico

Function : Author

S.-H. Lee

Function : Author

M. Lemoine-Goumard

Function : Author
PersonId : 755595
ORCID : 0000-0002-4462-3686

Centre d'Etudes Nucléaires de Bordeaux Gradignan

M. Llena Garde

Function : Author

F. Longo

Function : Author
PersonId : 755442
ORCID : 0000-0003-2501-2270

F. Loparco

Function : Author

M. N. Lovellette

Function : Author

P. Lubrano

Function : Author

A. Makeev

Function : Author

M. N. Mazziotta

Function : Author

P. F. Michelson

Function : Author

W. Mitthumsiri

Function : Author

T. Mizuno

Function : Author

C. Monte

Function : Author

M. E. Monzani

Function : Author

A. Morselli

Function : Author

I. V. Moskalenko

Function : Author

S. Murgia

Function : Author

M. Naumann-Godo

Function : Author

P. L. Nolan

Function : Author

J. P. Norris

Function : Author

E. Nuss

Function : Author

Laboratoire de Physique Théorique et Astroparticules

T. Ohsugi

Function : Author

N. Omodei

Function : Author

E. Orlando

Function : Author

J. F. Ormes

Function : Author

B. Pancrazi

Function : Author

Centre d'étude spatiale des rayonnements

D. Parent

Function : Author

Centre d'Etudes Nucléaires de Bordeaux Gradignan

M. Pepe

Function : Author

M. Pesce-Rollins

Function : Author
PersonId : 760585
ORCID : 0000-0003-1790-8018

F. Piron

Function : Author
PersonId : 172749
IdHAL : frederic-piron
ORCID : 0000-0001-6885-7156

Laboratoire de Physique Théorique et Astroparticules

T.A. Porter

Function : Author

S. Rainò

Function : Author

R. Rando

Function : Author

A. Reimer

Function : Author
PersonId : 755465
ORCID : 0000-0001-8604-7077

O. Reimer

Function : Author

T. Reposeur

Function : Author
PersonId : 738492
IdHAL : thierry-reposeur
ORCID : 0000-0001-6939-3429
IdRef : 139970665

Centre d'Etudes Nucléaires de Bordeaux Gradignan

J. Ripken

Function : Author

R. W. Romani

Function : Author

M. Roth

Function : Author

H. F.-W. Sadrozinski

Function : Author

P. M. Saz Parkinson

Function : Author

C. Sgrò

Function : Author

E. J. Siskind

Function : Author

David Stanley Smith

Function : Author
PersonId : 866129

Centre d'Etudes Nucléaires de Bordeaux Gradignan

P. Spinelli

Function : Author

M. S. Strickman

Function : Author

D. J. Suson

Function : Author

H. Takahashi

Function : Author

T. Takahashi

Function : Author

T. Tanaka

Function : Author
PersonId : 756461
ORCID : 0000-0002-4383-0368

J. B. Thayer

Function : Author

J. G. Thayer

Function : Author

L. Tibaldo

Function : Author

Astrophysique Interprétation Modélisation

D. F. Torres

Function : Author

G. Tosti

Function : Author

A. Tramacere

Function : Author

Y. Uchiyama

Function : Author

T. L. Usher

Function : Author

V. Vasileiou

Function : Author

C. Venter

Function : Author
PersonId : 755527
ORCID : 0000-0002-2666-4812

N. Vilchez

Function : Author

V. Vitale

Function : Author
PersonId : 760184
ORCID : 0000-0001-8040-7852

A. P. Waite

Function : Author

P. Wang

Function : Author

N. Webb

Function : Author

B. L. Winer

Function : Author

Z. Yang

Function : Author

T. Ylinen

Function : Author

M. Ziegler

Function : Author

Centre d'étude spatiale des rayonnements

Abstract

Globular clusters with their large populations of millisecond pulsars (MSPs) are believed to be potential emitters of high-energy gamma-ray emission. Our goal is to constrain the millisecond pulsar populations in globular clusters from analysis of gamma-ray observations. We use 546 days of continuous sky-survey observations obtained with the Large Area Telescope aboard the Fermi Gamma-ray Space Telescope to study the gamma-ray emission towards 13 globular clusters. Steady point-like high-energy gamma-ray emission has been significantly detected towards 8 globular clusters. Five of them (47 Tucanae, Omega Cen, NGC 6388, Terzan 5, and M 28) show hard spectral power indices $(0.7 < \Gamma <1.4)$ and clear evidence for an exponential cut-off in the range 1.0-2.6 GeV, which is the characteristic signature of magnetospheric emission from MSPs. Three of them (M 62, NGC 6440 and NGC 6652) also show hard spectral indices $(1.0 < \Gamma < 1.7)$, however the presence of an exponential cut-off can not be unambiguously established. Three of them (Omega Cen, NGC 6388, NGC 6652) have no known radio or X-ray MSPs yet still exhibit MSP spectral properties. From the observed gamma-ray luminosities, we estimate the total number of MSPs that is expected to be present in these globular clusters. We show that our estimates of the MSP population correlate with the stellar encounter rate and we estimate 2600-4700 MSPs in Galactic globular clusters, commensurate with previous estimates. The observation of high-energy gamma-ray emission from a globular cluster thus provides a reliable independent method to assess their millisecond pulsar populations that can be used to make constraints on the original neutron star X-ray binary population, essential for understanding the importance of binary systems in slowing the inevitable core collapse of globular clusters.

Keywords

pulsars: general globular clusters: general gamma rays: general

Domains

High Energy Astrophysical Phenomena [astro-ph.HE] High Energy Astrophysical Phenomena [astro-ph.HE]

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https://hal.in2p3.fr/in2p3-00585161

Submitted on : Monday, April 11, 2011-11:14:14 PM

Last modification on : Friday, June 2, 2023-3:36:26 PM

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in2p3-00585161 , version 1 (11-04-2011)

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HAL Id : in2p3-00585161 , version 1
ARXIV : 1003.3588
DOI : 10.1051/0004-6361/201014458

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A.A. Abdo, Markus Ackermann, Marco Ajello, Luca Baldini, Jean Ballet, et al.. A population of gamma-ray emitting globular clusters seen with the Fermi Large Area Telescope. Astronomy and Astrophysics - A&A, 2010, 524, pp.A75. ⟨10.1051/0004-6361/201014458⟩. ⟨in2p3-00585161⟩

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A population of gamma-ray emitting globular clusters seen with the Fermi Large Area Telescope

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