Tomography of the Fermi-lat γ-ray diffuse extragalactic signal via cross correlations with galaxy catalogs

Xia, Jun-Qing; Cuoco, Alessandro; Branchini, Enzo; Viel, Matteo

doi:10.1088/0067-0049/217/1/15

Title: Tomography of the Fermi-lat γ-ray diffuse extragalactic signal via cross correlations with galaxy catalogs

Journal Article · Sun Mar 01 00:00:00 EST 2015 · Astrophysical Journal, Supplement Series

DOI:https://doi.org/10.1088/0067-0049/217/1/15· OSTI ID:22872403

Xia, Jun-Qing ^[1]; Cuoco, Alessandro ^[2]; Branchini, Enzo ^[3]; Viel, Matteo ^[4]

Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Science, P. O. Box 918-3, Beijing 100049 (China)
Department of Physics, University of Torino, via P. Giuria 1, I-10125 Torino (Italy)
Dipartimento di Matematica e Fisica, Università degli Studi “Roma Tre,” via della Vasca Navale 84, I-00146 Roma (Italy)
INAF Osservatorio Astronomico di Trieste, Via G. B. Tiepolo 11, I-34141, Trieste (Italy)

Building on our previous cross-correlation analysis (Xia et al. 2011) between the isotropic γ-ray background (IGRB) and different tracers of the large-scale structure of the universe, we update our results using 60 months of data from the Large Area Telescope (LAT) on board the Fermi Gamma-ray Space Telescope (Fermi). We perform a cross-correlation analysis both in configuration and spherical harmonics space between the IGRB and objects that may trace the astrophysical sources of the IGRB: QSOs in the Sloan Digital Sky Survey (SDSS) DR6, the SDSS DR8 Main Galaxy Sample, luminous red galaxies (LRGs) in the SDSS catalog, infrared-selected galaxies in the Two Micron All Sky Survey (2MASS), and radio galaxies in the NRAO VLA Sky Survey (NVSS). The benefit of correlating the Fermi-LAT signal with catalogs of objects at various redshifts is to provide tomographic information on the IGRB, which is crucial in separating the various contributions and clarifying its origin. The main result is that, unlike in our previous analysis, we now observe a significant (>3.5σ) cross-correlation signal on angular scales smaller than 1° in the NVSS, 2MASS, and QSO cases and, at lower statistical significance (∼3.0σ), with SDSS galaxies. The signal is stronger in two energy bands, E > 0.5 GeV and E > 1 GeV, but it is also seen at E > 10 GeV. No cross-correlation signal is detected between Fermi data and the LRGs. These results are robust against the choice of the statistical estimator, estimate of errors, map cleaning procedure, and instrumental effects. Finally, we test the hypothesis that the IGRB observed by Fermi-LAT originates from the summed contributions of three types of unresolved extragalactic sources: BL Lacertae objects (BL Lacs), flat spectrum radio quasars (FSRQs), and star-forming galaxies (SFGs). We find that a model in which the IGRB is mainly produced by SFGs (72{sub −37}{sup +23}% with 2σ errors), with BL Lacs and FSRQs giving a minor contribution, provides a good fit to the data. We also consider a possible contribution from misaligned active galactic nuclei, and we find that, depending on the details of the model and its uncertainty, they can also provide a substantial contribution, partly degenerate with the SFG one.

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OSTI ID:: 22872403

Journal Information:: Astrophysical Journal, Supplement Series, Vol. 217, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0067-0049

Country of Publication:: United States

Language:: English

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Anisotropies in the diffuse gamma-ray background measured by the Fermi LAT Ackermann, M.; Ajello, M.; Albert, A. arXiv https://doi.org/10.48550/arxiv.1202.2856	text	January 2012
Joint anisotropy and source count constraints on the contribution of blazars to the diffuse gamma-ray background Cuoco, Alessandro; Komatsu, Eiichiro; Siegal-Gaskins, Jennifer arXiv https://doi.org/10.48550/arxiv.1202.5309	text	January 2012
Clustering, Bias and the Accretion Mode of X-ray selected AGN Koutoulidis, L.; Plionis, M.; Georgantopoulos, I. arXiv https://doi.org/10.48550/arxiv.1209.6460	text	January 2012
Diffuse Pionic Gamma-Ray Emission from Large Scale Structures in the FERMI Era Dobardzic, Aleksandra; Prodanovic, Tijana arXiv https://doi.org/10.48550/arxiv.1210.4551	text	January 2012
Constraints on the annihilation cross section of dark matter particles from anisotropies in the diffuse gamma-ray background measured with Fermi-LAT Ando, Shin'ichiro; Komatsu, Eiichiro arXiv https://doi.org/10.48550/arxiv.1301.5901	text	January 2013
The Cosmic Evolution of Fermi BL Lacertae Objects Ajello, M.; Romani, R. W.; Gasparrini, D. arXiv https://doi.org/10.48550/arxiv.1310.0006	text	January 2013
Dissecting the Gamma-Ray Background in Search of Dark Matter Cholis, Ilias; Hooper, Dan; McDermott, Samuel D. arXiv https://doi.org/10.48550/arxiv.1312.0608	text	January 2013
Galaxy and Mass Assembly (GAMA): The evolution of bias in the radio source population to z ~ 1.5 Lindsay, S. N.; Jarvis, M. J.; Santos, M. G. arXiv https://doi.org/10.48550/arxiv.1402.5654	text	January 2014
The radio luminosity function from the low-frequency 3CRR, 6CE & 7CRS complete samples Willott, Chris J.; Rawlings, Steve; Blundell, Katherine M. arXiv https://doi.org/10.48550/arxiv.astro-ph/0010419	text	January 2000
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Fast estimation of polarization power spectra using correlation functions Chon, Gayoung; Challinor, Anthony; Prunet, Simon arXiv https://doi.org/10.48550/arxiv.astro-ph/0303414	text	January 2003
The spatial clustering of radio sources in NVSS and FIRST; implications for galaxy clustering evolution Overzier, R. A.; Rottgering, H. J. A.; Rengelink, R. B. arXiv https://doi.org/10.48550/arxiv.astro-ph/0304160	text	January 2003
The Case for a Low Extragalactic Gamma-ray Background Keshet, Uri; Waxman, Eli; Loeb, Abraham arXiv https://doi.org/10.48550/arxiv.astro-ph/0306442	text	January 2003
HEALPix -- a Framework for High Resolution Discretization, and Fast Analysis of Data Distributed on the Sphere Gorski, K. M.; Hivon, E.; Banday, A. J. arXiv https://doi.org/10.48550/arxiv.astro-ph/0409513	text	January 2004
Cross-correlation of 2MASS and WMAP3: Implications for the Integrated Sachs-Wolfe effect Rassat, Anais; Land, Kate; Lahav, Ofer arXiv https://doi.org/10.48550/arxiv.astro-ph/0610911	text	January 2006

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