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Article: Studying the SGR 1806-20/Cl* 1806-20 Region Using the Fermi Large Area Telescope

TitleStudying the SGR 1806-20/Cl* 1806-20 Region Using the Fermi Large Area Telescope
Authors
Issue Date2016
PublisherIOP Publishing. The Journal's web site is located at http://iopscience.iop.org/0004-637X/
Citation
The Astrophysical Journal, 2016, v. 827 n. 1, p. 41:1-8 How to Cite?
AbstractThe region around SGR 1806-20 and its host stellar cluster Cl* 1806-20 is a potentially important site of particle acceleration. The soft γ-ray repeater and Cl* 1806-20, which also contains several very massive stars including a luminous blue variable hypergiant LBV 1806-20, are capable of depositing a large amount of energy to the surroundings. Using the data taken with the Fermi Large Area Telescope (LAT), we identified an extended LAT source to the southwest of Cl* 1806-20. The centroid of the 1–50 GeV emission is consistent with that of HESS J1808-204 (until now unidentified). The LAT spectrum is best-fit by a broken power law with the break energy {E}{{b}}=297+/- 15 {MeV}. The index above E b is 2.60 ± 0.04 and is consistent with the flux and spectral index above 100 GeV for HESS J1808-204, suggesting an association between the two sources. Meanwhile, the interacting supernova remnant SNR G9.7-0.0 is also a potential contributor to the LAT flux. A tentative flux enhancement at the MeV band during a 45 day interval (2011 January 21–March 7) is also reported. We discuss possible origins of the extended LAT source in the context of both leptonic and hadronic scenarios.
Persistent Identifierhttp://hdl.handle.net/10722/229400

 

DC FieldValueLanguage
dc.contributor.authorYeung, KH-
dc.contributor.authorKong, AKH-
dc.contributor.authorTam, PH-
dc.contributor.authorLin, LCC-
dc.contributor.authorHui, CY-
dc.contributor.authorHu, CP-
dc.contributor.authorCheng, KS-
dc.date.accessioned2016-08-23T14:10:55Z-
dc.date.available2016-08-23T14:10:55Z-
dc.date.issued2016-
dc.identifier.citationThe Astrophysical Journal, 2016, v. 827 n. 1, p. 41:1-8-
dc.identifier.urihttp://hdl.handle.net/10722/229400-
dc.description.abstractThe region around SGR 1806-20 and its host stellar cluster Cl* 1806-20 is a potentially important site of particle acceleration. The soft γ-ray repeater and Cl* 1806-20, which also contains several very massive stars including a luminous blue variable hypergiant LBV 1806-20, are capable of depositing a large amount of energy to the surroundings. Using the data taken with the Fermi Large Area Telescope (LAT), we identified an extended LAT source to the southwest of Cl* 1806-20. The centroid of the 1–50 GeV emission is consistent with that of HESS J1808-204 (until now unidentified). The LAT spectrum is best-fit by a broken power law with the break energy {E}{{b}}=297+/- 15 {MeV}. The index above E b is 2.60 ± 0.04 and is consistent with the flux and spectral index above 100 GeV for HESS J1808-204, suggesting an association between the two sources. Meanwhile, the interacting supernova remnant SNR G9.7-0.0 is also a potential contributor to the LAT flux. A tentative flux enhancement at the MeV band during a 45 day interval (2011 January 21–March 7) is also reported. We discuss possible origins of the extended LAT source in the context of both leptonic and hadronic scenarios.-
dc.languageeng-
dc.publisherIOP Publishing. The Journal's web site is located at http://iopscience.iop.org/0004-637X/-
dc.relation.ispartofThe Astrophysical Journal-
dc.titleStudying the SGR 1806-20/Cl* 1806-20 Region Using the Fermi Large Area Telescope-
dc.typeArticle-
dc.identifier.emailHu, CP: cphu@hku.hk-
dc.identifier.emailCheng, KS: hrspksc@hkucc.hku.hk-
dc.identifier.authorityCheng, KS=rp00675-
dc.identifier.doi10.3847/0004-637X/827/1/41-
dc.identifier.hkuros262650-
dc.identifier.volume827-
dc.identifier.issue1-
dc.identifier.spage41:1-
dc.identifier.epage8-

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