J/ApJ/948/33ivo://CDS.VizieR/J/ApJ/948/33doi:10.26093/cds/vizier.19480033CDSBanovetz J.Milisavljevic D.Sravan N.Weil K.E.Subrayan B.,Fesen R.A.Patnaude D.J.Plucinsky P.P.Law C.J.Blair W.P.,Morse J.A.2025-08-11T20:15:10Z2025-06-18T15:24:57ZCDS support team

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

cds-question@unistra.frsupernova-remnantsinterstellar-mediumproper-motionsvisible-astronomyWe present proper motion measurements of the oxygen-rich ejecta of the LMC supernova remnant N132D using two epochs of Hubble Space Telescope Advanced Camera for Surveys data spanning 16 years. The proper motions of 120 individual knots of oxygen-rich gas were measured and used to calculate a center of expansion (CoE) of {alpha}=5h25m01.71s and {delta}=-69{deg}38'41.64" (J2000) with a 1{sigma} uncertainty of 2.90". This new CoE measurement is 9.2" and 10.8" from two previous CoE estimates based on the geometry of the optically emitting ejecta. We also derive an explosion age of 2770+/-500yr, which is consistent with recent age estimates of ~2500yr made from 3D ejecta reconstructions. We verified our estimates of the CoE and age using a new automated procedure that detected and tracked the proper motions of 137 knots, with 73 knots that overlap with the visually identified knots. We find that the proper motions of the ejecta are still ballistic, despite the remnant's age, and are consistent with the notion that the ejecta are expanding into an interstellar medium cavity. Evidence for explosion asymmetry from the parent supernova is also observed. Using the visually measured proper motion measurements and corresponding CoE and age, we compare N132D to other supernova remnants with proper motion ejecta studies.2023ApJ...948...33Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/948/33CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJS/179/195 : A catalog of outer ejecta knots in Cas A (Hammell+, 2008)J/ApJ/780/59 : The Araucaria project: EBs in SMC (Graczyk+, 2014)J/A+A/586/A71 : LMC 0.2-100GeV images (Ackermann+, 2016)J/ApJ/816/49 : Spitzer/IRAC observations of SMC Cepheids (Scowcroft+, 2016)J/ApJ/915/20 : Photometry of stars in & near 1E 0102.2-7219 (Li+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/948/33https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/948/33http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/948/33https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/948/33https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/948/33http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/948/33GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/948/33/tablea2 (*Manually inspected knot measurements and corresponding automated measurements)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/948/33/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/948/33/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/948/33/tablea2?GETtext/xml+votable180.050000true81.278162569.65133750.0055555555555555566/3449https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/948/33?format=asciiOpticaldefaultJ/ApJ/948/33/tablea2*Manually inspected knot measurements and corresponding automated measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintKnot[1/167] Internal Knot index numbermeta.id;meta.mainintRAJ2000[5] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[69] Degree of Declination (J2000)pos.eq.dec;meta.mainpmRA-Vis[-11.2/7.1]? Visual procedure proper motion along RAmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA-Vis[0.005/0.7]? Uncertainty in pmRA-Vismas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE-Vis[-7.8/11]? Visual procedure proper motion along DEmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE-Vis[0.06/0.7]? Uncertainty in pmDE-Vismas/yrstat.error;pos.pm;pos.eq.decfloatnullablepmRA-Auto[-12.4/10]? Automated procedure proper motion along RAmas/yrpos.pm;pos.eq.rafloatnullablee_pmRA-Auto[0/0.7]? Uncertainty in pmRA-Automas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE-Auto[-13.6/13.6]? Automated procedure proper motion along DEmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE-Auto[0/0.7]? Uncertainty in pmDE-Automas/yrstat.error;pos.pm;pos.eq.decfloatnullable