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Article: Fermi discovery of gamma-ray emission from the globular cluster terzan 5

TitleFermi discovery of gamma-ray emission from the globular cluster terzan 5
Authors
KeywordsGamma rays: stars
Globular clusters: individual (Terzan 5)
Pulsars: general
Issue Date2010
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2010, v. 712 n. 1 PART 2, p. L36-L39 How to Cite?
AbstractWe report the discovery of gamma-ray emission from the Galactic globular cluster (GC) Terzan 5 using data taken with the Fermi Gamma-ray Space Telescope, from 2008 August 8 to 2010 January 1. Terzan 5 is clearly detected in the 0.5-20 GeV band by Fermi at ∼27σ level. This makes Terzan 5 the second gamma-ray-emitting GC seen by Fermi after 47 Tuc. The energy spectrum of Terzan 5 is best represented by an exponential cutoff power-law model, with a photon index of ∼1.9 and a cutoff energy at ∼3.8 GeV. By comparing Terzan 5 to 47 Tuc, we suggest that the observed gamma-ray emission is associated with millisecond pulsars and is either from the magnetospheres or inverse Compton scattering between the relativistic electrons/positrons in the pulsar winds and the background soft photons from the Galactic plane. Furthermore, it is suggestive that the distance to Terzan 5 is less than 10 kpc and >10 GeV photons can be seen in the future. © 2010. The American Astronomical Society. All rights reserved..
Persistent Identifierhttp://hdl.handle.net/10722/80541
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
Funding AgencyGrant Number
National Science Council of the Republic of China (Taiwan)NSC96-2112-M007-037-MY3
HongKong GovernmentHKU700908P
Funding Information:

This project is supported partly by the National Science Council of the Republic of China (Taiwan) through grant NSC96-2112-M007-037-MY3. K. S. C. is supported by a GRF grant of HongKong Government under HKU700908P. We thank D.O. Chernyshov and V. Dogiel for useful discussion.

References

 

DC FieldValueLanguage
dc.contributor.authorKong, AKHen_HK
dc.contributor.authorHui, CYen_HK
dc.contributor.authorCheng, KSen_HK
dc.date.accessioned2010-09-06T08:07:35Z-
dc.date.available2010-09-06T08:07:35Z-
dc.date.issued2010en_HK
dc.identifier.citationAstrophysical Journal Letters, 2010, v. 712 n. 1 PART 2, p. L36-L39en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/80541-
dc.description.abstractWe report the discovery of gamma-ray emission from the Galactic globular cluster (GC) Terzan 5 using data taken with the Fermi Gamma-ray Space Telescope, from 2008 August 8 to 2010 January 1. Terzan 5 is clearly detected in the 0.5-20 GeV band by Fermi at ∼27σ level. This makes Terzan 5 the second gamma-ray-emitting GC seen by Fermi after 47 Tuc. The energy spectrum of Terzan 5 is best represented by an exponential cutoff power-law model, with a photon index of ∼1.9 and a cutoff energy at ∼3.8 GeV. By comparing Terzan 5 to 47 Tuc, we suggest that the observed gamma-ray emission is associated with millisecond pulsars and is either from the magnetospheres or inverse Compton scattering between the relativistic electrons/positrons in the pulsar winds and the background soft photons from the Galactic plane. Furthermore, it is suggestive that the distance to Terzan 5 is less than 10 kpc and >10 GeV photons can be seen in the future. © 2010. The American Astronomical Society. All rights reserved..en_HK
dc.languageengen_HK
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_HK
dc.relation.ispartofAstrophysical Journal Lettersen_HK
dc.rightsThe Astrophysical Journal Letters. Copyright © Institute of Physics Publishing Ltd.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectGamma rays: starsen_HK
dc.subjectGlobular clusters: individual (Terzan 5)en_HK
dc.subjectPulsars: generalen_HK
dc.titleFermi discovery of gamma-ray emission from the globular cluster terzan 5en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=2041-8205&volume=712&issue=1&spage=L36&epage=L39&date=2010&atitle=Fermi+discovery+of+gamma-ray+emission+from+the+globular+cluster+terzan+5-
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturepostprint-
dc.identifier.doi10.1088/2041-8205/712/1/L36en_HK
dc.identifier.scopuseid_2-s2.0-77949280830en_HK
dc.identifier.hkuros169448en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77949280830&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume712en_HK
dc.identifier.issue1 PART 2en_HK
dc.identifier.spageL36en_HK
dc.identifier.epageL39en_HK
dc.identifier.isiWOS:000275418200008-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridKong, AKH=35185316600en_HK
dc.identifier.scopusauthoridHui, CY=12781234500en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK

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