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dc.contributor.author
Aliu, E.
dc.contributor.author
Arlen, T.
dc.contributor.author
Aune, T.
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Beilicke, M.
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Benbow, W.
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Bouvier, A.
dc.contributor.author
Bradbury, S. M.
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Buckley, J. H.
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Bugaev, V.
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Byrum, K.
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Cannon, A.
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Cesarini, A.
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Ciupik, L.
dc.contributor.author
Collins Hughes, E.
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Connolly, M. P.
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Cui, W.
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Dickherber, R.
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Duke, C.
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Errando, M.
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Falcone, A.
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Finley, J. P.
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Finnegan, G.
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Fortson, N.
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Furniss, A.
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Galante, N.
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Gall, D.
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Godambe, S.
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Griffin, S.
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Grube, J.
dc.contributor.author
Pichel, Ana Carolina
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dc.contributor.author
The Veritas Collaboration
dc.date.available
2017-06-26T14:29:37Z
dc.date.issued
2012-02-20
dc.identifier.citation
Aliu, E.; Arlen, T.; Aune, T.; Beilicke, M.; Benbow, W.; et al.; VERITAS Observations of Day-scale Flaring of M 87 in 2010 April; Iop Publishing; Astrophysical Journal; 746; 2; 20-2-2012; 1-7; 141
dc.identifier.issn
0004-637X
dc.identifier.uri
http://hdl.handle.net/11336/18849
dc.description.abstract
VERITAS has been monitoring the very-high-energy (VHE; E > 100 GeV) gamma-ray activity of the radio galaxy M 87 since 2007. During 2008, flaring activity on a timescale of a few days was observed with a peak flux of (0.70 ± 0.16) x 10^-11 cm^-2 s^-1 at energies above 350 GeV. In 2010 April, VERITAS detected a flare from M 87 with peak flux of (2.71 ± 0.68) × 10^-11 cm^-2 s^-1 for E > 350 GeV. The source was observed for six consecutive nights during the flare, resulting in a total of 21 hr of good-quality data. The most rapid flux variation occurred on the trailing edge of the flare with an exponential flux decay time of 0.90 +0.22 -0.15 days. The shortest detected exponential rise time is three times as long, at 2.87 +1.65 -0.99 days. The quality of the data sample is such that spectral analysis can be performed for three periods: rising flux, peak flux, and falling flux. The spectra obtained are consistent with power-law forms. The spectral index at the peak of the flare is equal to 2.19 ± 0.07. There is some indication that the spectrum is softer in the falling phase of the flare than the peak phase, with a confidence level corresponding to 3.6 standard deviations. We discuss the implications of these results for the acceleration and cooling rates of VHE electrons in M 87 and the constraints they provide on the physical size of the emitting region.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Iop Publishing
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dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Galaxies: Individual (M 87, Ver J1230+123)
dc.subject
Gamma Rays: Galaxies
dc.subject.classification
Astronomía
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dc.subject.classification
Ciencias Físicas
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dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
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dc.title
VERITAS Observations of Day-scale Flaring of M 87 in 2010 April
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-06-21T18:56:27Z
dc.journal.volume
746
dc.journal.number
2
dc.journal.pagination
1-7; 141
dc.journal.pais
Reino Unido
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dc.journal.ciudad
Londres
dc.description.fil
Fil: Aliu, E.. Columbia University; Estados Unidos
dc.description.fil
Fil: Arlen, T.. University of California; Estados Unidos
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Fil: Aune, T.. University of California; Estados Unidos
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Fil: Beilicke, M.. University of Washington; Estados Unidos
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Fil: Benbow, W.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
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Fil: Bouvier, A.. University of California; Estados Unidos
dc.description.fil
Fil: Bradbury, S. M.. University of Leeds; Reino Unido
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Fil: Buckley, J. H.. University of Washington; Estados Unidos
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Fil: Bugaev, V.. University of Washington; Estados Unidos
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Fil: Byrum, K.. Argonne National Laboratory; Estados Unidos
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Fil: Cannon, A.. University College Dublin; Irlanda
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Fil: Cesarini, A.. National University of Ireland Galway; Irlanda
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Fil: Ciupik, L.. Adler Planetarium and Astronomy Museum; Estados Unidos
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Fil: Collins Hughes, E.. University College Dublin; Irlanda
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Fil: Connolly, M. P.. National University of Ireland Galway; Irlanda
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Fil: Cui, W.. Purdue University; Estados Unidos
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Fil: Dickherber, R.. University of Washington; Estados Unidos
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Fil: Duke, C.. Grinnell College; Estados Unidos
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Fil: Errando, M.. Columbia University; Estados Unidos
dc.description.fil
Fil: Falcone, A.. Pennsylvania State University; Estados Unidos
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Fil: Finley, J. P.. Purdue University; Estados Unidos
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Fil: Finnegan, G.. University of Utah; Estados Unidos
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Fil: Fortson, N.. University Of Minnesota; Estados Unidos
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Fil: Furniss, A.. University of California; Estados Unidos
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Fil: Galante, N.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
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Fil: Gall, D.. University of Iowa; Estados Unidos
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Fil: Godambe, S.. University of Utah; Estados Unidos
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Fil: Griffin, S.. McGill University; Canadá
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Fil: Grube, J.. Adler Planetarium and Astronomy Museum; Estados Unidos
dc.description.fil
Fil: Pichel, Ana Carolina. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
dc.description.fil
Fil: The Veritas Collaboration.
dc.journal.title
Astrophysical Journal
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dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1088/0004-637X/746/2/141
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1112.4518
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info:eu-repo/semantics/altIdentifier/url/http://iopscience.iop.org/article/10.1088/0004-637X/746/2/141/meta
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