J/A+A/701/A206ivo://CDS.VizieR/J/A+A/701/A206doi:10.26093/cds/vizier/bc-nx/lcagCDSGiuffrida R.Lemoine-Gourmard M.Miceli M.Gabici S.Sano H.Aruga M.,Mayer M.Becker W.Sasaki M.Fukui Y.2026-08-03T06:57:09Z2025-09-16T08:14:25ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsupernova-remnantsgamma-ray-astronomyradio-sourcesSupernova remnants (SNRs) interacting with molecular clouds are interesting laboratories to study the acceleration of cosmic rays and their propagation in the dense ambient medium. We analyze 14 years of Fermi-LAT observations of the supernova remnant Puppis A to investigate its asymmetric gamma-ray morphology and spectral properties. This middle-aged remnant (~4kyr) is evolving in an inhomogeneous environment, interacting with a dense molecular cloud in the northeast and a lower-density medium in the southwest. We find clear differences in both gamma-ray luminosity and spectral energy distribution between these two regions. The emission from both sides is consistent with a hadronic origin. However, while the southwestern emission can be explained by standard Diffusive Shock Acceleration (DSA), the northeastern side may involve re-acceleration of pre-existing cosmic rays or acceleration via reflected shocks in the dense cloud environment. Additionally, we identify two significant gamma-ray excesses outside the remnant, including a previously unreported source to the south. These features are likely produced by cosmic rays that have escaped Puppis A and are interacting with nearby dense molecular material. From this extended emission, we estimate the total energy in escaping cosmic rays to be W_CR_~1.5x10^49^erg, providing important constraints on cosmic-ray propagation around the remnant.2025A&A...701A.206Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/701/A206CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/701/A206https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/701/A206http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/701/A206https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/701/A206https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/701/A206http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/701/A206GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/701/A206/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/701/A206/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/701/A206/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/701/A206/list?GETtext/xml+votable180.050000true126.28401-42.860320.0055555555555555566/39266-39267https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/701/A206?format=asciiGamma-rayRadiodefaultJ/A+A/701/A206/listList of fits imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension of center (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of center (J2000)degpos.eq.dec;meta.mainNxNumber of pixels along X-axismeta.numberintNyNumber of pixels along Y-axismeta.numberintObs.dateObservation datestime.epoch;obsnullablesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fits