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Article: Gamma-ray emission from the globular clusters liller 1, M80, NGC6139, NGC6541, NGC6624, and NGC6752

TitleGamma-ray emission from the globular clusters liller 1, M80, NGC6139, NGC6541, NGC6624, and NGC6752
Authors
Keywordsgamma rays: stars
globular clusters: individual (Liller 1, M80, NGC 6139, NGC 6441, NGC 6541,NGC 6624, and NGC 6752)
pulsars: general
Issue Date2011
PublisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205
Citation
Astrophysical Journal Letters, 2011, v. 729 n. 2 How to Cite?
AbstractGlobular clusters (GCs) are emerging as a new class of γ-ray emitters, thanks to the data obtained from the Fermi Gamma-ray Space Telescope. By now, eight GCs are known to emit γ-rays at energies >100 MeV. Based on the stellar encounter rate of the GCs, we identify potential γ-ray emitting GCs out of all known GCs that have not been studied in detail before. In this paper, we report the discovery of a number of new γ-ray GCs: Liller 1, NGC6624, and NGC6752, and evidence of γ-ray emission from M80, NGC6139, and NGC6541, in which γ-rays were found within the GC tidal radius. With one of the highest metallicities among all GCs in the Milky Way, the γ-ray luminosity of Liller 1 is found to be the highest of all known γ-ray GCs. In addition, we confirm a previous report of a significant γ-ray emitting region next to NGC6441. We briefly discuss the observed offset of γ-rays from some GC cores. The increasing number of known γ-ray GCs at distances out to 10 kpc is important for us to understand the γ-ray emitting mechanism and provides an alternative probe to the underlying millisecond pulsar populations of the GCs. © 2011. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/133265
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
Funding AgencyGrant Number
Chungnam National University
Hong Kong GovernmentHKU700908P
National Science Council of the Republic of China (Taiwan)NSC96-2112-M-007-037-MY3
NSC99-2112-M-007-004-MY3
Funding Information:

We acknowledge the use of data and software facilities from the FSSC, managed by the HEASARC at the Goddard Space Flight Center. C.Y.H. is supported by the research fund of Chungnam National University in 2010. K.S.C. is supported by a GRF grant of the Hong Kong Government under HKU700908P, and A.K.H.K. is supported partly by the National Science Council of the Republic of China (Taiwan) through grant NSC96-2112-M-007-037-MY3 and NSC99-2112-M-007-004-MY3.

References

 

DC FieldValueLanguage
dc.contributor.authorTam, PHTen_HK
dc.contributor.authorKong, AKHen_HK
dc.contributor.authorHui, CYen_HK
dc.contributor.authorCheng, KSen_HK
dc.contributor.authorLi, Cen_HK
dc.contributor.authorLu, TNen_HK
dc.date.accessioned2011-05-06T09:26:55Z-
dc.date.available2011-05-06T09:26:55Z-
dc.date.issued2011en_HK
dc.identifier.citationAstrophysical Journal Letters, 2011, v. 729 n. 2en_HK
dc.identifier.issn2041-8205en_HK
dc.identifier.urihttp://hdl.handle.net/10722/133265-
dc.description.abstractGlobular clusters (GCs) are emerging as a new class of γ-ray emitters, thanks to the data obtained from the Fermi Gamma-ray Space Telescope. By now, eight GCs are known to emit γ-rays at energies >100 MeV. Based on the stellar encounter rate of the GCs, we identify potential γ-ray emitting GCs out of all known GCs that have not been studied in detail before. In this paper, we report the discovery of a number of new γ-ray GCs: Liller 1, NGC6624, and NGC6752, and evidence of γ-ray emission from M80, NGC6139, and NGC6541, in which γ-rays were found within the GC tidal radius. With one of the highest metallicities among all GCs in the Milky Way, the γ-ray luminosity of Liller 1 is found to be the highest of all known γ-ray GCs. In addition, we confirm a previous report of a significant γ-ray emitting region next to NGC6441. We briefly discuss the observed offset of γ-rays from some GC cores. The increasing number of known γ-ray GCs at distances out to 10 kpc is important for us to understand the γ-ray emitting mechanism and provides an alternative probe to the underlying millisecond pulsar populations of the GCs. © 2011. The American Astronomical Society. All rights reserved.en_HK
dc.languageeng-
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. Copyright © Institute of Physics Publishing, Inc.-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectgamma rays: starsen_HK
dc.subjectglobular clusters: individual (Liller 1, M80, NGC 6139, NGC 6441, NGC 6541,NGC 6624, and NGC 6752)en_HK
dc.subjectpulsars: generalen_HK
dc.titleGamma-ray emission from the globular clusters liller 1, M80, NGC6139, NGC6541, NGC6624, and NGC6752en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0004-637X&volume=729&issue=2 article no. 90&spage=&epage=&date=2011&atitle=Gamma-ray+emission+from+the+globular+clusters+Liller+1,+M80,+NGC+6139,+NGC+6541,+NGC+6624,+and+NGC+6752-
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hken_HK
dc.identifier.authorityCheng, KS=rp00675en_HK
dc.description.naturepostprint-
dc.identifier.doi10.1088/0004-637X/729/2/90en_HK
dc.identifier.scopuseid_2-s2.0-79952149644en_HK
dc.identifier.hkuros184972-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79952149644&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume729en_HK
dc.identifier.issue2en_HK
dc.identifier.isiWOS:000288608700013-
dc.publisher.placeUnited Kingdomen_HK
dc.identifier.scopusauthoridTam, PHT=35243989500en_HK
dc.identifier.scopusauthoridKong, AKH=35185316600en_HK
dc.identifier.scopusauthoridHui, CY=12781234500en_HK
dc.identifier.scopusauthoridCheng, KS=9745798500en_HK
dc.identifier.scopusauthoridLi, C=44561316200en_HK
dc.identifier.scopusauthoridLu, TN=35185279200en_HK

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