J/ApJS/179/195ivo://CDS.VizieR/J/ApJS/179/195doi:10.26093/cds/vizier.21790195CDSHammell M.C.Fesen R.A.2009-10-20T12:59:43Z2009-10-20T12:52:44ZCDS support team

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

cds-question@unistra.frinterstellar-mediumsupernova-remnantshst-photometryHubble Space Telescope images of the core-collapse supernova remnant Cassiopeia A are used to identify high-velocity knots of ejecta located outside the remnant's main emission shell of expanding debris. These ejecta fragments are found near or ahead of the remnant's forward shock front and mostly lie from 120" to 300" in radial distance from the remnant's center of expansion. Filter flux ratios when correlated with published spectra show that these knots can be divided into three emission classes: (1) knots dominated by [NII] {lambda}6548,{lambda}6583 emissions, (2) knots dominated by [OII] {lambda}7319, {lambda}7330 emissions, and (3) knots displaying filter flux ratios suggestive of [SII], [OII], and [ArIII] {lambda}7135 emission line strengths similar to the "fast-moving knots" (FMKs) found in the remnant's bright main shell. Of 1825 knots identified, 444 are strong [NII] emission knots, 192 are strong [OII] emission knots, and 1189 are FMK-like knots. In terms of location around the remnant, 972, 207, and 646 knots are found in the remnant's northeast jet, southwest jet, and non-jet regions, respectively. Assuming a distance of 3.4kpc, derived knot transverse velocities based on proper motion measurements spanning a 9 month interval indicate maximum transverse expansion velocities for these three knot classes of 14500, 13500, and 11500km/s, respectively. We present a catalog of these outlying ejecta clumps comprising finding charts, epoch 2004.2 knot positions, proper motions, photometric filter fluxes, and estimated knot emission type, along with cross-references to previous knot identifications and data. This compilation represents a nearly tenfold increase in the number of outlying, high-velocity ejecta knots identified around the Cassiopeia A remnant.2008ApJS..179..195Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/179/195CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)J/ApJ/456/234 : Cas A radio knots spectral indices (Anderson+ 1996)J/ApJ/613/343 : Cas A knot and filament proper motions (Delaney+, 2004)J/A+A/484/755 : Oxygen recombination lines from Cas A knots (Docenko+, 2008)J/ApJS/174/379 : Optical imaging and spectra of 3C 58 (Fesen+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/179/195https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/179/195http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/179/195https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/179/195https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/179/195http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/179/195GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/179/195/table2 (Catalog of outlying ejecta knots in Cas A)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/179/195/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/179/195/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/179/195/table2?GETtext/xml+votable180.050000true350.867333358.86058330.0055555555555555566/14285https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/179/195?format=asciiOpticaldefaultJ/ApJS/179/195/table2Catalog of outlying ejecta knots in Cas ArecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[HF2008]Knot identification numbermeta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.mainPAPosition angle of knot (2)degpos.posAngfloatRRadial distance from center (2)arcsecphys.angSizefloatpmProper motion (3)mas/yrpos.pmintTypeKnot type (4)src.classcharF625W? HST F625W band flux1e-20W.m**-2phot.flux;em.opt.RfloatnullableF775W? HST F775W band flux1e-20W.m**-2phot.mag;em.opt.IfloatnullableF850LP? HST F860LP band flux1e-20W.m**-2phot.flux;em.opt.IfloatnullableC-IDCross-knot identification or associationmeta.id.assocchar