J/A+A/680/A80ivo://CDS.VizieR/J/A+A/680/A80doi:10.26093/cds/vizier/bc-n8/liaCDSGodinaud L.Acero F.Decourchelle A.Ballet J.2026-07-03T06:35:43Z2023-12-13T15:41:40ZCDS support team

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

cds-question@unistra.frsupernova-remnantsx-ray-sourcesproper-motionsEven 450 years after the explosion of the Type Ia SN1572, the dynamics of the Tycho supernova remnant can give us keys to understand the explosion mechanism and the interaction of the remnant with the interstellar medium. To probe the asymmetries and the evolution of the SNR, we track the ejecta dynamics using new methods applied to the deep X-ray observations available in the Chandra space telescope archive. For the line of sight velocity measurement Vz, we use the Doppler effect focused on the bright Si line in the 1.6-2.1keV band. Using the component separation tool General Morphological Component Analysis (GMCA), we successfully disentangle the red and blueshifted Si ejecta emission. This allows us to reconstruct a map of the peak energy of the Si line with a total coverage of the SNR at a 2'' resolution and a proxy of the velocity in the line of sight. For the proper motions in the plane of the sky Vxy, we develop a new method, named Poisson Optical Flow, to measure the displacement of 2D features between the observations of 2003 and 2009. The result is a field of 1700 velocity vectors covering the entire SNR. These exhaustive 3D velocity measurements reveal the complex and patchy dynamics of the SNR. At the large-scale, an asymmetry with the North being dominantly blueshifted and the South redshifted is observed. The proper motion vector field Vxy highlights different dynamics between the East and the West parts of the SNR. The eastern velocity field is more disturbed by external inhomogeneities and the South-East ejecta knot. In particular, a slow-down is observed in the North-East which could be due to the interaction with higher densities as seen in other wavelengths. The vector field is also used to backtrace the center of the explosion which is then compared with potential stellar progenitors distances from the latest Gaia DR3, leaving only stars B and E as possible candidates, at respective distances of 2.53_-0.20_^+0.23^kpc and 3.52_-1.0_^+2.0^kpc, which are consistent with the expected distance range of the SNR at 2.5-4kpc.2023A&A...680A..80Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/680/A80CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/439/354 : Sources around Tycho's Supernova 1572 (Bedin+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/680/A80https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/680/A80http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/680/A80https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/680/A80https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/680/A80http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/680/A80GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/680/A80/fig6 (*Proper motion vector field between 2003 and 2009 obtained with the tool POF)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/680/A80/fig6?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/680/A80/fig6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/680/A80/fig6?GETtext/xml+votable180.050000true6.297264.06610.005555555555555556Cone search capability for table J/A+A/680/A80/list (Informations on fits image datacube)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/680/A80/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/680/A80/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/680/A80/list?GETtext/xml+votable180.050000true6.3349864.1370.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/A+A/680/A806/3063https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/680/A80?format=asciiX-raydefaultJ/A+A/680/A80/fig6*Proper motion vector field between 2003 and 2009 obtained with the tool POFrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainVRAProper motion vector field component along RAkm/sphys.velocfloatVDEProper motion vector field component along DEkm/sphys.velocfloatE_VRAError on VRA (upper value)km/sstat.error;stat.maxfloate_VRAError on VRA (lower value)km/sstat.errorfloatE_VDEError on VDE (upper value)km/sstat.error;stat.maxfloate_VDEError on VDE (lower value)km/sstat.errorfloatJ/A+A/680/A80/listInformations on fits image datacuberecnoRecord 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.numberintNzNumber imagesmeta.number;phys.atmol.numberintsizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar