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Title:An update on the arrival direction studies made with data from the Pierre Auger Observatory
Authors:ID Golup, Geraldina (Author)
ID Filipčič, Andrej (Author)
ID Lundquist, Jon Paul (Author)
ID Shivashankara, Shima Ujjani (Author)
ID Stanič, Samo (Author)
ID Vorobiov, Serguei (Author)
ID Zavrtanik, Danilo (Author)
ID Zavrtanik, Marko (Author), et al.
Files:.pdf ICRC2023_252.pdf (2,45 MB)
MD5: F0DDD6A7839842E3D26BC873A41C2AF0
 
URL https://pos.sissa.it/444/
 
URL https://pos.sissa.it/444/252.pdf
 
Language:English
Work type:Unknown
Typology:1.08 - Published Scientific Conference Contribution
Organization:UNG - University of Nova Gorica
Abstract:The search for anisotropies in the arrival directions of ultra-high-energy cosmic rays plays a key role in the efforts to understand their origin. The observed first-harmonic modulation in right ascension above 8 EeV, detected by the Pierre Auger Observatory with a current significance of 6.9�, suggests an extragalactic origin above this energy. Furthermore, there are indications, at the ∼4� significance level, of anisotropies at intermediate angular scales, which are obtained when comparing the arrival directions against the distribution of potential sources from astrophysical catalogs, in particular that of nearby starburst galaxies, and around the Centaurus region. In this contribution, we present the status of the different searches for anisotropies at small, intermediate and large angular scales. We use the latest available data set, with 19 years of operation that has yielded 135,000 km^2 yr sr of accumulated exposure, covering the sky at declinations from −90◦ to 45◦. At small and intermediate scales, we report updates of the all-sky blind search for localized excesses, the study around the Centaurus region, and the likelihood analysis with catalogs of candidate sources. We have also studied the regions of the sky from which the Telescope Array Collaboration has reported hints of excesses in their data and we find no significant effects in the same directions with a data set of comparable size. At large angular scales, the dipolar and quadrupolar amplitudes in energy bins are updated. We discuss the prospects of these searches, both in regards to increases in statistics and in relation to the future inclusion of event-by-event mass estimators in these analyses through the upgrade of the Observatory, AugerPrime.
Keywords:anisotropies, Pierre Auger Observatory, ultra-high energy cosmic-rays, arrival directions
Publication status:Published
Publication version:Version of Record
Publication date:01.01.2023
Year of publishing:2023
Number of pages:str. 1-13
PID:20.500.12556/RUNG-8779 New window
COBISS.SI-ID:182020867 New window
UDC:52
ISSN on article:1824-8039
DOI:10.22323/1.444.0252 New window
NUK URN:URN:SI:UNG:REP:RWXNQKBF
Publication date in RUNG:22.01.2024
Views:2113
Downloads:7
Metadata:XML DC-XML DC-RDF
:
GOLUP, Geraldina, FILIPČIČ, Andrej, LUNDQUIST, Jon Paul, SHIVASHANKARA, Shima Ujjani, STANIČ, Samo, VOROBIOV, Serguei, ZAVRTANIK, Danilo and ZAVRTANIK, Marko, 2023, An update on the arrival direction studies made with data from the Pierre Auger Observatory. In : 38th International Cosmic Ray Conference [also] ICRC2023 [online]. Published Scientific Conference Contribution. 2023. p. 1–13. [Accessed 7 April 2025]. Retrieved from: https://repozitorij.ung.si/IzpisGradiva.php?lang=eng&id=8779
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Record is a part of a proceedings

Title:38th International Cosmic Ray Conference [also] ICRC2023
COBISS.SI-ID:162195971 New window

Record is a part of a journal

Title:Proceedings of science
Shortened title:Pos proc. sci.
Publisher:Sissa
ISSN:1824-8039
COBISS.SI-ID:20239655 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:P1-0031
Name:Večglasniška astrofizika

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License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

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