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Title: Gamma-ray Source Stacking Analysis at Low Galactic Latitude

Abstract

We studied the problematic of uncertainties in the diffuse gamma radiation apparent in stacking analysis of EGRET data at low Galactic latitudes. Subsequently, we co-added maps of counts, exposure and diffuse background, and residuals, in varying numbers for different sub-categories of putatively and known source populations (like PSRs). Finally we tested for gamma-ray excess emission in those maps and attempt to quantify the systematic biases in such approach. Such kind of an analysis will help the classification processes of sources and source populations in the GLAST era.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
902728
Report Number(s):
SLAC-PUB-12479
astro-ph/0611648; TRN: US200719%%114
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Presented at The Multi-Messenger Approach to Unidentified Gamma-Ray Sources: 3rd Workshop on the Nature of Unidentified High-Energy Sources, Barcelona, Spain, 4-7 Jul 2006
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GALAXIES; COSMIC GAMMA SOURCES; DATA COVARIANCES; GAMMA RADIATION; Astrophysics,ASTRO

Citation Formats

Cillis, Analia N., /NASA, Goddard, Reimer, Olaf, /Stanford U., HEPL, Torres, Diego F., and /ICREA, Barcelona /Barcelona, IEEC. Gamma-ray Source Stacking Analysis at Low Galactic Latitude. United States: N. p., 2007. Web.
Cillis, Analia N., /NASA, Goddard, Reimer, Olaf, /Stanford U., HEPL, Torres, Diego F., & /ICREA, Barcelona /Barcelona, IEEC. Gamma-ray Source Stacking Analysis at Low Galactic Latitude. United States.
Cillis, Analia N., /NASA, Goddard, Reimer, Olaf, /Stanford U., HEPL, Torres, Diego F., and /ICREA, Barcelona /Barcelona, IEEC. Wed . "Gamma-ray Source Stacking Analysis at Low Galactic Latitude". United States. doi:. https://www.osti.gov/servlets/purl/902728.
@article{osti_902728,
title = {Gamma-ray Source Stacking Analysis at Low Galactic Latitude},
author = {Cillis, Analia N. and /NASA, Goddard and Reimer, Olaf and /Stanford U., HEPL and Torres, Diego F. and /ICREA, Barcelona /Barcelona, IEEC},
abstractNote = {We studied the problematic of uncertainties in the diffuse gamma radiation apparent in stacking analysis of EGRET data at low Galactic latitudes. Subsequently, we co-added maps of counts, exposure and diffuse background, and residuals, in varying numbers for different sub-categories of putatively and known source populations (like PSRs). Finally we tested for gamma-ray excess emission in those maps and attempt to quantify the systematic biases in such approach. Such kind of an analysis will help the classification processes of sources and source populations in the GLAST era.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Apr 25 00:00:00 EDT 2007},
month = {Wed Apr 25 00:00:00 EDT 2007}
}

Conference:
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  • We studied the problem of the treatment of uncertainties in the diffuse gamma radiation apparent in stacking analysis of EGRET data at low Galactic latitudes for several classes of sources like PSRs. For those classes of sources we co-added maps of counts, exposure and diffuse background, and residuals, in varying numbers for different sub-categories. Finally we tested for gamma-ray excess emission in those maps and attempt to quantify the systematic biases in such approach. Such kinds of analysis will support and provide confidence in the classification processes of sources and source populations in the GLAST era.
  • We studied the problem of the treatment of uncertainties in the diffuse gamma radiation apparent in stacking analysis of EGRET data at low Galactic latitudes for several classes of sources like PSRs. For those classes of sources we co-added maps of counts, exposure and diffuse background, and residuals, in varying numbers for different sub-categories. Finally we tested for gamma-ray excess emission in those maps and attempt to quantify the systematic biases in such approach. Such kinds of analysis will support and provide confidence in the classification processes of sources and source populations in the GLAST era.
  • Gamma-ray data from SAS-2 is analyzed. It is suggested that enhanced gamma radiation in the arm segments of the galaxy is due to the interaction of cosmic rays with the matter in the galactic arms. (BJG)
  • During a search for gamma-ray emission from NGC 3628 (Arp 317), two new unidentified gamma-ray sources were discovered, Fermi J1049.7+0435 and J1103.2+1145. The detections were made using data from the Large Area Telescope (LAT), on board the Fermi Gamma-Ray Space Telescope, in the 100 MeV to 300 GeV band during the period between 2008 August 5 and 2012 October 27. Neither detection is coincident with any source listed in the second Fermi-LAT (2FGL) catalog. Fermi J1049.7+0435 is at Galactic coordinates (l, b) = (245.°34, 53.°27), (α{sub J2000}, δ{sub J2000}) = (162.°43, 4.°60). Fermi J1103.2+1145 is at Galactic coordinates (l, b)more » = (238.°85, 60.°33), (α{sub J2000}, δ{sub J2000}) = (165.°81, 11.°75). Possible radio counterparts are found for both sources, which show flat radio spectra similar to other Fermi-LAT detected active galactic nuclei, and their identifications are discussed.« less