Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-10-15
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
22 pages, 11 figures, accepted for publication in Progress of Theoretical Physics
Scientific paper
We investigated the spatial correlation between the arrival directions of the highest energy cosmic rays (HECRs) detected by the Akeno Giant Air Shower Array (AGASA) with energies above $4 \times 10^{19}$ eV and the positions of galaxies observed by the Sloan Digital Sky Survey (SDSS) within $z = 0.024$. We systematically tested the dependence of the correlation on the redshift ranges and properties of the galaxies, i.e., absolute luminosity, color, and morphology, to understand where HECR sources are and what objects are HECR sources. In the systematic survey, we found potential signals of the positive correlation at small angular scale ($<10^{\circ}$) with the (non-penalized) chance probability less than 5% in intermediate redshift ranges. Then, we estimated penalized probabilities to compensate the trial effects of angular scan, and found that the strongest correlation is produced by early-type galaxies in $0.012 \leq z < 0.018$ at 90% C.L. The possible origin of HECRs which correlating galaxies imply is also discussed.
Nishimichi Takahiro
Sato Katsuhiko
Takami Hajime
No associations
LandOfFree
Systematic Survey of the Correlation between Northern HECR Events and SDSS Galaxies does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Systematic Survey of the Correlation between Northern HECR Events and SDSS Galaxies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Systematic Survey of the Correlation between Northern HECR Events and SDSS Galaxies will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-617688