Conveners
Parallel 11: Diffuse
- Stefan Wagner
eROSITA (extended ROentgen Survey with an Imaging Telescope Array) is the primary instrument on the Spectrum-Roentgen-Gamma (SRG) mission, which was successfully launched on July 13, 2019, from the Baikonour cosmodrome. After the commissioning of the instrument and a subsequent calibration and performance verification phase, eROSITA started a survey of the entire sky on December 13, 2019. I...
The Tibet ASγ and LHAASO collaborations recently provided the first evidence of a diffuse γ-ray emission in the Galaxy up to the PeV from the Galactic plane. Due to the challenges this imposes to current theoretical models it is crucial to carefully study different scenarios of diffuse γ-ray production, specially towards the centre of the Galaxy. In particular, the current models of diffuse...
The Galactic Center (GC) region has been intensively studied in gamma-rays in the past decades. Fermi LAT has discovered a GeV excess which is not fully understood, and the first detection of a PeVatron by H.E.S.S. indicates the existence of cosmic ray sources providing energies up to a PeV or higher. The emission of TeV gamma rays in the GC is affected by the source position and the...
The bulk of the |b|<10° 4FGL unassociated sources exhibit very soft spectra (power-law index distribution peaking around 2.6), have a Galactic-latitude distribution extending out to 10 degrees, and present notable clustering. These peculiar features, unseen in any classes of associated sources, raise the question of their possible spurious character and of their nature if real. We will...
Although diffuse gamma-ray emission is a powerful probe to study the interstellar medium (ISM) and Galactic cosmic rays (CRs), the uncertainty of the interstellar gas density has always been an issue. To overcome this difficulty, we newly used a component decomposition of the 21-cm HI line emission and used the resulting gas maps in an analysis of gamma-ray data for the MBM 53, 54, and 55...
