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Article: Unraveling the nature of unidentified high galactic latitude FERMI/LAT gamma-ray sources with Suzaku

TitleUnraveling the nature of unidentified high galactic latitude FERMI/LAT gamma-ray sources with Suzaku
Authors
KeywordsGalaxies: Active
Gamma Rays: General
Pulsars: General
Radiation Mechanisms: Non-Thermal
X-Rays: 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?
AbstractHere we report on the results of deep X-ray follow-up observations of four unidentified γ-ray sources detected by the Fermi/LAT instrument at high Galactic latitudes using the X-ray Imaging Spectrometers on board the Suzaku satellite. All of the studied objects were detected with high significance during the first three months of Fermi/LAT operation and subsequently better localized in the first Fermi/LAT catalog (1FGL). For some of them, possible associations with pulsars and active galaxies have subsequently been discussed, and our observations provide an important contribution to this debate. In particular, a bright X-ray point source has been found within the 95% confidence error circle of 1FGLJ1231.1-1410. The X-ray spectrum of the discovered Suzaku counterpart of 1FGLJ1231.1-1410 is well fitted by a blackbody with an additional power-law component. This supports the recently claimed identification of this source with a millisecond pulsar PSRJ1231-1411. For the remaining three Fermi objects, on the other hand, the X-ray observations performed are less conclusive. In the case of 1FGLJ1311.7-3429, two bright X-ray point sources were found within the LAT 95% error circle. Even though the X-ray spectral and variability properties for these sources were robustly assessed, their physical nature and relationship with the γ-ray source remain uncertain. Similarly, we found several weak X-ray sources in the field of 1FGLJ1333.2+5056, one coinciding with the high-redshift blazar CLASSJ1333+5057. We argue that the available data are consistent with the physical association between these two objects, although the large positional uncertainty of the γ-ray source hinders a robust identification. Finally, we have detected an X-ray point source in the vicinity of 1FGLJ2017.3+0603. This Fermi object was recently suggested to be associated with a newly discovered millisecond radio pulsar PSRJ2017+0603, because of the spatial coincidence and the detection of the γ-ray pulsations in the light curve of 1FGLJ2017.3+0603. Interestingly, we have detected the X-ray counterpart of the high-redshift blazar CLASSJ2017+0603, located within the error circle of the γ-ray source, while we were only able to determine an X-ray flux upper limit at the pulsar position. All in all, our studies indicate that while a significant fraction of unidentified high Galactic latitude γ-ray sources is related to the pulsar and blazar phenomena, associations with other classes of astrophysical objects are still valid options. © 2011. The American Astronomical Society. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/188406
ISSN
2015 Impact Factor: 5.487
2015 SCImago Journal Rankings: 3.369
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorMaeda, Ken_US
dc.contributor.authorKataoka, Jen_US
dc.contributor.authorNakamori, Ten_US
dc.contributor.authorStawarz, Len_US
dc.contributor.authorMakiya, Ren_US
dc.contributor.authorTotani, Ten_US
dc.contributor.authorCheung, CCen_US
dc.contributor.authorDonato, Den_US
dc.contributor.authorGehrels, Nen_US
dc.contributor.authorSaz Parkinson, Pen_US
dc.contributor.authorKanai, Yen_US
dc.contributor.authorKawai, Nen_US
dc.contributor.authorTanaka, Yen_US
dc.contributor.authorSato, Ren_US
dc.contributor.authorTakahashi, Ten_US
dc.contributor.authorTakahashi, Yen_US
dc.date.accessioned2013-09-03T04:05:29Z-
dc.date.available2013-09-03T04:05:29Z-
dc.date.issued2011en_US
dc.identifier.citationAstrophysical Journal Letters, 2011, v. 729 n. 2en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/10722/188406-
dc.description.abstractHere we report on the results of deep X-ray follow-up observations of four unidentified γ-ray sources detected by the Fermi/LAT instrument at high Galactic latitudes using the X-ray Imaging Spectrometers on board the Suzaku satellite. All of the studied objects were detected with high significance during the first three months of Fermi/LAT operation and subsequently better localized in the first Fermi/LAT catalog (1FGL). For some of them, possible associations with pulsars and active galaxies have subsequently been discussed, and our observations provide an important contribution to this debate. In particular, a bright X-ray point source has been found within the 95% confidence error circle of 1FGLJ1231.1-1410. The X-ray spectrum of the discovered Suzaku counterpart of 1FGLJ1231.1-1410 is well fitted by a blackbody with an additional power-law component. This supports the recently claimed identification of this source with a millisecond pulsar PSRJ1231-1411. For the remaining three Fermi objects, on the other hand, the X-ray observations performed are less conclusive. In the case of 1FGLJ1311.7-3429, two bright X-ray point sources were found within the LAT 95% error circle. Even though the X-ray spectral and variability properties for these sources were robustly assessed, their physical nature and relationship with the γ-ray source remain uncertain. Similarly, we found several weak X-ray sources in the field of 1FGLJ1333.2+5056, one coinciding with the high-redshift blazar CLASSJ1333+5057. We argue that the available data are consistent with the physical association between these two objects, although the large positional uncertainty of the γ-ray source hinders a robust identification. Finally, we have detected an X-ray point source in the vicinity of 1FGLJ2017.3+0603. This Fermi object was recently suggested to be associated with a newly discovered millisecond radio pulsar PSRJ2017+0603, because of the spatial coincidence and the detection of the γ-ray pulsations in the light curve of 1FGLJ2017.3+0603. Interestingly, we have detected the X-ray counterpart of the high-redshift blazar CLASSJ2017+0603, located within the error circle of the γ-ray source, while we were only able to determine an X-ray flux upper limit at the pulsar position. All in all, our studies indicate that while a significant fraction of unidentified high Galactic latitude γ-ray sources is related to the pulsar and blazar phenomena, associations with other classes of astrophysical objects are still valid options. © 2011. The American Astronomical Society. All rights reserved.en_US
dc.languageengen_US
dc.publisherInstitute of Physics Publishing Ltd. The Journal's web site is located at http://iopscience.iop.org/2041-8205en_US
dc.relation.ispartofAstrophysical Journal Lettersen_US
dc.subjectGalaxies: Activeen_US
dc.subjectGamma Rays: Generalen_US
dc.subjectPulsars: Generalen_US
dc.subjectRadiation Mechanisms: Non-Thermalen_US
dc.subjectX-Rays: Generalen_US
dc.titleUnraveling the nature of unidentified high galactic latitude FERMI/LAT gamma-ray sources with Suzakuen_US
dc.typeArticleen_US
dc.identifier.emailSaz Parkinson, P: pablosp@hku.hken_US
dc.identifier.authoritySaz Parkinson, P=rp01803en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1088/0004-637X/729/2/103en_US
dc.identifier.scopuseid_2-s2.0-79952132206en_US
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-79952132206&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume729en_US
dc.identifier.issue2en_US
dc.identifier.isiWOS:000288608700026-
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridMaeda, K=35380606700en_US
dc.identifier.scopusauthoridKataoka, J=25637485000en_US
dc.identifier.scopusauthoridNakamori, T=8273010400en_US
dc.identifier.scopusauthoridStawarz, L=35243922200en_US
dc.identifier.scopusauthoridMakiya, R=36970276500en_US
dc.identifier.scopusauthoridTotani, T=7006556639en_US
dc.identifier.scopusauthoridCheung, CC=23102309500en_US
dc.identifier.scopusauthoridDonato, D=7004020295en_US
dc.identifier.scopusauthoridGehrels, N=35353135800en_US
dc.identifier.scopusauthoridSaz Parkinson, P=8948464400en_US
dc.identifier.scopusauthoridKanai, Y=10340522400en_US
dc.identifier.scopusauthoridKawai, N=7202652119en_US
dc.identifier.scopusauthoridTanaka, Y=15729604800en_US
dc.identifier.scopusauthoridSato, R=7403249153en_US
dc.identifier.scopusauthoridTakahashi, T=7406462482en_US
dc.identifier.scopusauthoridTakahashi, Y=44561695100en_US

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