Evidence for New Unidentified TeV γ-ray Sources from Angularly Correlated Hot Spots Observed by Independent TeV γ-ray Sky Surveys | Zendy

Gary Walker | Zendy; R. Atkins | Zendy; D. Kieda | Zendy

Open Access

Evidence for New Unidentified TeV γ-ray Sources from Angularly Correlated Hot Spots Observed by Independent TeV γ-ray Sky Surveys

Author(s) -

Gary Walker,

R. Atkins,

D. Kieda

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/425863

Subject(s) - sky , physics , observatory , uncorrelated , spots , hot spot (computer programming) , astrophysics , astronomy , statistics , mathematics , chemistry , computer science , operating system

We have examined the directional cross-correlation of statistical `hot-spots'between a Northern Sky TeV Gamma Ray Survey by the Milagro Observatory and asimilar survey by the Tibet Array. We find the directions of these hot-spotsare angularly uncorrelated between the two surveys for large angularseparations (Delta theta > 4 degrees), but there appears to be a statisticallysignificant correlation between hot-spot directions for Delta theta < 1.5degrees. Independent simulations indicate the chance probability for theoccurrence of this correlation is approximately 10^-4, implying the existenceof one or more previously unobserved TeV gamma-ray sources in these directions.The data sets are consistent with both point-like sources or diffuse sourceswith extent of 1 - 2 degrees.Comment: 12 pages, 2 figures, 3 tables. Submitted to Astrophysical Journal Letter

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