Event-sequence time series analysis for very-high energy light curves

Ulisses Barres De Almeida; Paula M. Chadwick; Michael Daniel; Hugh Dickinson; Sam J. Nolan; Lowry McComb

Event-sequence time series analysis for very-high energy light curves

Ulisses Barres De Almeida, Paula M. Chadwick, Michael Daniel, Hugh Dickinson, Sam J. Nolan, Lowry McComb

Physics and Astronomy (Twin Cities)

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

A detailed analysis of the light-curves of AGNs and of some other classes of astronomical sources is essential for understanding their behaviour, since variability carries important signatures of the physical processes at work in them. In the particular case of blazars, the VHE end of the spectrum is the region where the most extreme temporal activity is observed, and its detailed characterization can be of great value if one can bypass the difficulties introduced by the low-photon statistics and extract the most information available from the data. In this paper we discuss the application of dynamic algorithms to the problem of detecting change-points in a unbinned one-dimensional event series, and discuss some of the benefits this approach can bring to the study of time variability at highenergies and ground-based gamma-ray telescopes.

Original language	English (US)
Title of host publication	31st International Cosmic Ray Conference, ICRC 2009
Publisher	University of Lodz
State	Published - Jan 1 2009
Event	31st International Cosmic Ray Conference, ICRC 2009 - Lodz, Poland Duration: Jul 7 2009 → Jul 15 2009

Other

Other	31st International Cosmic Ray Conference, ICRC 2009
Country/Territory	Poland
City	Lodz
Period	7/7/09 → 7/15/09

Keywords

Event-sequence
Ground-based gamma-ray astronomy
Time-series analysis

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title = "Event-sequence time series analysis for very-high energy light curves",

abstract = "A detailed analysis of the light-curves of AGNs and of some other classes of astronomical sources is essential for understanding their behaviour, since variability carries important signatures of the physical processes at work in them. In the particular case of blazars, the VHE end of the spectrum is the region where the most extreme temporal activity is observed, and its detailed characterization can be of great value if one can bypass the difficulties introduced by the low-photon statistics and extract the most information available from the data. In this paper we discuss the application of dynamic algorithms to the problem of detecting change-points in a unbinned one-dimensional event series, and discuss some of the benefits this approach can bring to the study of time variability at highenergies and ground-based gamma-ray telescopes.",

keywords = "Event-sequence, Ground-based gamma-ray astronomy, Time-series analysis",

author = "{De Almeida}, {Ulisses Barres} and Chadwick, {Paula M.} and Michael Daniel and Hugh Dickinson and Nolan, {Sam J.} and Lowry McComb",

year = "2009",

month = jan,

day = "1",

language = "English (US)",

booktitle = "31st International Cosmic Ray Conference, ICRC 2009",

publisher = "University of Lodz",

note = "31st International Cosmic Ray Conference, ICRC 2009 ; Conference date: 07-07-2009 Through 15-07-2009",

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TY - GEN

T1 - Event-sequence time series analysis for very-high energy light curves

AU - De Almeida, Ulisses Barres

AU - Chadwick, Paula M.

AU - Daniel, Michael

AU - Dickinson, Hugh

AU - Nolan, Sam J.

AU - McComb, Lowry

PY - 2009/1/1

Y1 - 2009/1/1

N2 - A detailed analysis of the light-curves of AGNs and of some other classes of astronomical sources is essential for understanding their behaviour, since variability carries important signatures of the physical processes at work in them. In the particular case of blazars, the VHE end of the spectrum is the region where the most extreme temporal activity is observed, and its detailed characterization can be of great value if one can bypass the difficulties introduced by the low-photon statistics and extract the most information available from the data. In this paper we discuss the application of dynamic algorithms to the problem of detecting change-points in a unbinned one-dimensional event series, and discuss some of the benefits this approach can bring to the study of time variability at highenergies and ground-based gamma-ray telescopes.

AB - A detailed analysis of the light-curves of AGNs and of some other classes of astronomical sources is essential for understanding their behaviour, since variability carries important signatures of the physical processes at work in them. In the particular case of blazars, the VHE end of the spectrum is the region where the most extreme temporal activity is observed, and its detailed characterization can be of great value if one can bypass the difficulties introduced by the low-photon statistics and extract the most information available from the data. In this paper we discuss the application of dynamic algorithms to the problem of detecting change-points in a unbinned one-dimensional event series, and discuss some of the benefits this approach can bring to the study of time variability at highenergies and ground-based gamma-ray telescopes.

KW - Event-sequence

KW - Ground-based gamma-ray astronomy

KW - Time-series analysis

UR - http://www.scopus.com/inward/record.url?scp=84899069894&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84899069894&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:84899069894

BT - 31st International Cosmic Ray Conference, ICRC 2009

PB - University of Lodz

T2 - 31st International Cosmic Ray Conference, ICRC 2009

Y2 - 7 July 2009 through 15 July 2009

ER -

Event-sequence time series analysis for very-high energy light curves

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