Publisher’s Note: Anisotropies in the diffuse gamma-ray background measured by the Fermi LAT [Phys. Rev. D<b>85</b>, 083007 (2012)]

Ackermann, M.; Ajello, M.; Albert, Andreas; Baldini, Luca; Ballet, J.; Barbiellini, G.; Bastieri, D.; Bechtol, K.; Bellazzini, R.; Bloom, E. D.; Bonamente, E.; Borgland, A. W.; Brandt, T. J.; Bregeon, J.; Brigida, M.; Bruel, Pascal; Buehler, R.; Buson, S.; Caliandro, G. A.; Cameron, R. A.; Caraveo, P. A.; Cecchi, C.; Charles, E.; Chekhtman, A.; Chiang, J.; Ciprini, S.; Claus, R.; Cohen-Tanugi, J.; Conrad, J. M.; Cuoco, A.; Cutini, S.; D’Ammando, F.; Palma, F. de; Dermer, C. D.; Digel, S. W.; Silva, E. do Couto e; Drell, P. S.; Drlica-Wagner, A.; Dubois, R.; Favuzzi, C.; Fegan, S. J.; Ferrara, E. C.; Fortin, P.; Fukazawa, Yasushi; Fusco, P.; Gargano, F.; Gasparrini, D.; Germani, S.; Giglietto, N.; Giroletti, M.; Glanzman, T.; Godfrey, G.; Gomez-Vargas, G. A.; Grégoire, Tristan; Grenier, I. A.; Grove, J. E.; Guiriec, S.; Gustafsson, M.; Hadasch, D.; Hayashida, M.; Hayashi, K.; Hou, X.; Hughes, R. E.; Jóhannesson, G.; Johnson, A. S.; Kamae, T.; Knödlseder, J.; Kuss, M.; Landé, J.; Latronico, L.; Lemoine‐Goumard, M.; Linden, Tim; Lionetto, Andrea; Garde, M. Llena; Longo, F.; Loparco, Francesco; Lovellette, M. N.; Lubrano, P.; Mazziotta, M. N.; McEnery, J. E.; Mitthumsiri, W.; Mizuno, T.; Monte, C.; Monzani, M. E.; Morselli, A.; Moskalenko, I. V.; Murgia, S.; Naumann-Godó, M.; Norris, J. P.; Nuss, E.; Ohsugi, T.; Okumura, A.; Orienti, M.; Orlando, E.; Ormes, J. F.; Paneque, D.; Panetta, J.; Parent, D.; Pavlidou, V.; Pesce-Rollins, M.; Pierbattista, M.; Piron, F.; Pivato, G.; Rainò, S.; Rando, R.; Reimer, A.; Reimer, O.; Roth, Manfred; Sbarra, C.; Schmitt, J. H. M. M.; Sgrò, C.; Siegal‐Gaskins, Jennifer M.; Siskind, E. J.; Spandre, G.; Spinelli, P.; Strong, A.; Suson, D. J.; Takahashi, H.; Tanaka, Takuya; Thayer, J. B.; Tibaldo, L.; Tinivella, M.; Torres, D. F.; Tosti, G.; Troja, E.; Usher, T.; Vandenbroucke, J.; Vasileiou, V.; Vianello, G.; Vitale, V.; Waite, A. P.; Winer, B. L.; Wood, K. S.; Wood, M.; Yang, Z.; Zimmer, S.; Komatsu, Eiichiro

doi:10.1103/physrevd.85.109901

Cited by 46 publications

(197 citation statements)

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“…The ROI also overlaps with Loop I, a large radio lobe in the Northern hemisphere [57,58]. While features corresponding to the radio observations have been observed in the Fermi data [49,[59][60][61], significant uncertainties remain in the modeling of the spatial and intensity profile of Loop I in gamma rays. As a result, we conservatively do not include a template that traces Loop I in our fiducial study.…”

Section: Analysis Proceduresmentioning

confidence: 99%

Search for dark matter annihilation in the Milky Way halo

2018

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The Milky Way halo is the brightest source of dark matter annihilation on the sky. Indeed, the potential strength of the Galactic dark matter signal can supersede that expected from dwarf galaxies and galaxy groups even in regions away from the Inner Galaxy. In this paper, we present the results of a search for dark matter annihilation in the smooth Milky Way halo for |b| > 20 • and r < 50 • using 413 weeks of Fermi Pass 8 data within the energy range of ∼0.8-50 GeV. We exclude thermal dark matter with mass below ∼70 GeV that annihilates to bb at the 95% confidence level using the p6v11 cosmic-ray foreground model, providing the strongest limits on the annihilation cross section in this mass range. These results exclude the region of dark matter parameter space that is consistent with the excess of ∼GeV photons observed at the Galactic Center for the bb annihilation channel and, for the first time, start probing the τ + τ − explanation. We explore how these results depend on uncertainties in the foregrounds by varying over a set of reasonable models.

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Section: Analysis Proceduresmentioning

confidence: 99%

Search for dark matter annihilation in the Milky Way halo

2018

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“…Star-forming and radio galaxies can also provide a non-negligible contribution in γ-ray sky. But at the high-latitude gamma-ray sky, blazars are the most numerous point sources and they are thought to be the main source of anisotropy in the extragalactic gamma-ray background [84][85][86][87][88][89].…”

Section: 22mentioning

confidence: 99%

Analysis of Fermi-LAT data from Tucana-II: possible constraints on the Dark Matter models with an intriguing hint of a signal

Bhattacharjee

Majumdar

Biswas

et al. 2019

J. Cosmol. Astropart. Phys.

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Tucana-II (Tuc-II), a recently discovered and confirmed Ultra Faint Dwarf Spheroidal galaxy, has a high mass to light ratio as well as a large line-of-sight stellar velocity dispersion, thus making it an ideal candidate for an indirect dark matter (DM) search. In this paper, we have analyzed nine years of γ-ray data obtained from the Fermi-LAT instrument from the direction of Tuc-II. The fact that a very weak significant γ-ray excess (2.2σ) over the background of Tuc-II have been detected from the location of this galaxy. We have observed that this excess of γ-ray emission from the of location Tuc-II rises with longer periods of data. If WIMP pair annihilation is assumed for this faint emission, for bb annihilation channel the test statistics (TS) value peaks at DM mass ∼ 14 GeV and for τ + τ − annihilation channel it peaks at DM mass 4 GeV. It is then called for an estimation of the 95% confidence level upper limit of the possible velocity weighted self-annihilation cross-section of the DM particles (WIMPs) within Tuc-II by fitting the observed γ-ray flux with spectra expected for DM annihilation. The estimated upper limits of the cross-sections from Tuc-II are then compared with two other dwarf galaxies that are considered to be good DM candidates in several studies. We have also compared our results with the cross-sections obtained in various popular theoretical models of the WIMPs to find that our results impose reasonable tight constraints on the parameter spaces of those DM models. In the concluding section, we compared our results with the similar results obtained from a combined dSph analysis by the Fermi-LAT collaboration as well as the results obtained from the studies of DM in the dwarf galaxies by the major ground-based Cherenkov experiments.

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“…For the cases involving three bins (redshift, B-luminosity and K-luminosity), we fit simultaneously the APS of the different bins, which are independent from each other (since the galaxy subsamples are not overlapping). For these samples, the number of parameters in the fit is 5 (11) in the reference (free C p ) model. For all the other samples the number of parameter is 5 (7) in the reference (free C p ) model.…”

Section: B Statistical Analysismentioning

confidence: 99%

“…Star formation is expected to trigger gamma-ray production in galaxies. Indeed, galaxies detected in γ-rays show a tight correlation between the luminosity in the range (0.1−100) GeV and the star formation rate (SFR): L γ = (1.3 ± 0.3) × 10 39 (SFR/M yr) 1.16±0.07 erg/s [11]. In turn, the star formation rate is correlated with the B-band magnitude (see, e.g., Fig.…”

Section: Star-forming Galaxiesmentioning

confidence: 99%

“…In parallel, a number of new and complementary techniques have been developed to study the UGRB in a more direct way. These uniquely exploit the sub-threshold information in the spatial distribution of γ-ray photons, and include the techniques of anisotropy [10][11][12][13][14][15][16][17][18], pixel statistics [19][20][21][22][23][24], and spatial cross-correlation with tracers of large-scale structure [25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42].…”

Section: Introductionmentioning

confidence: 99%

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Characterizing the local gamma-ray Universe via angular cross-correlations

et al. 2018

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With a decade of γ-ray data from the Fermi-LAT telescope, we can now hope to answer how well we understand the local Universe at γ-ray frequencies. On the other hand, with γ-ray data alone it is not possible to directly access the distance of the emission and to point out the origin of unresolved sources. This obstacle can be overcome by cross-correlating the γ-ray data with catalogs of objects with well-determined redshifts and positions. In this work, we cross-correlate Fermi-LAT skymaps with the 2MPZ catalog to study the local z < 0.2 γ-ray Universe, where about 10% of the total unresolved γ-ray background is produced. We find the signal to be dominated by AGN emissions, while star forming galaxies provide a subdominant contribution. Possible hints for a particle DM signal are discussed.

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Publisher’s Note: Anisotropies in the diffuse gamma-ray background measured by the Fermi LAT [Phys. Rev. D85, 083007 (2012)]

Cited by 46 publications

References 0 publications

Search for dark matter annihilation in the Milky Way halo

Search for dark matter annihilation in the Milky Way halo

Analysis of Fermi-LAT data from Tucana-II: possible constraints on the Dark Matter models with an intriguing hint of a signal

Characterizing the local gamma-ray Universe via angular cross-correlations

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