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@ARTICLE{Song:619037,
      author       = {Song, Deheng and Eckner, Christopher and Gordon, Chris and
                      Calore, Francesca and Macias, Oscar and Abazajian, Kevork N.
                      and Horiuchi, Shunsaku and Kaplinghat, Manoj and Pohl,
                      Martin},
      title        = {{R}obust inference of the {G}alactic {C}entre gamma-ray
                      excess spatial properties},
      journal      = {Monthly notices of the Royal Astronomical Society},
      volume       = {530},
      number       = {4},
      issn         = {0035-8711},
      address      = {Oxford},
      publisher    = {Oxford Univ. Press},
      reportid     = {PUBDB-2024-07337, arXiv:2402.05449. LAPTH-009/24},
      pages        = {4395-4411},
      year         = {2024},
      note         = {2024MNRAS.530.4395S. 21 pages, 11 figures},
      abstract     = {The gamma-ray Fermi-LAT Galactic Centre excess (GCE) has
                      puzzled scientists for over 15 yr. Despite ongoing debates
                      about its properties, and especially its spatial
                      distribution, its nature remains elusive. We scrutinize how
                      the estimated spatial morphology of this excess depends on
                      models for the Galactic diffuse emission, focusing
                      particularly on the extent to which the Galactic plane and
                      point sources are masked. Our main aim is to compare a
                      spherically symmetric morphology – potentially arising
                      from the annihilation of dark matter (DM) particles – with
                      a boxy morphology – expected if faint unresolved sources
                      in the Galactic bulge dominate the excess emission. Recent
                      claims favouring a DM-motivated template for the GCE are
                      shown to rely on a specific Galactic bulge template, which
                      performs worse than other templates for the Galactic bulge.
                      We find that a non-parametric model of the Galactic bulge
                      derived from the VISTA Variables in the Via Lactea survey
                      results in a significantly better fit for the GCE than
                      DM-motivated templates. This result is independent of
                      whether a galprop-based model or a more non-parametric
                      ring-based model is used to describe the diffuse Galactic
                      emission. This conclusion remains true even when additional
                      freedom is added in the background models, allowing for
                      non-parametric modulation of the model components and
                      substantially improving the fit quality. When adopted,
                      optimized background models provide robust results in terms
                      of preference for a boxy bulge morphology for the GCE,
                      regardless of the mask applied to the Galactic plane.},
      keywords     = {background: model (INSPIRE) / galaxy: model (INSPIRE) /
                      dark matter: annihilation (INSPIRE) / symmetry: rotation
                      (INSPIRE) / gamma ray: emission (INSPIRE) / modulation
                      (INSPIRE) / spatial distribution (INSPIRE) / quality
                      (INSPIRE) / GLAST (INSPIRE) / astroparticle physics
                      (autogen) / pulsars: general (autogen) / Galaxy: bulge
                      (autogen) / local interstellar matter (autogen) / dark
                      matter (autogen) / gamma-rays: diffuse background (autogen)},
      cin          = {$Z_THAT$},
      ddc          = {520},
      cid          = {$I:(DE-H253)Z_THAT-20210408$},
      pnm          = {613 - Matter and Radiation from the Universe (POF4-613) /
                      SMASH - Machine learning for Sciences and Humanities
                      (101081355) / EOSC Future - EOSC Future (101017536)},
      pid          = {G:(DE-HGF)POF4-613 / G:(EU-Grant)101081355 /
                      G:(EU-Grant)101017536},
      experiment   = {EXP:(DE-MLZ)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      eprint       = {2402.05449},
      howpublished = {arXiv:2402.05449},
      archivePrefix = {arXiv},
      SLACcitation = {$\%\%CITATION$ = $arXiv:2402.05449;\%\%$},
      UT           = {WOS:001215834400005},
      doi          = {10.1093/mnras/stae923},
      url          = {https://bib-pubdb1.desy.de/record/619037},
}