J/A+A/623/A173ivo://CDS.VizieR/J/A+A/623/A173doi:10.26093/cds/vizier.36230173CDSVarenius E.Conway J.E.Batejat F.Marti-Vidal I.Perez-Torres M.A.,Aalto S.Alberdi A.Lonsdale C.J.Diamond P.2021-02-03T13:41:47Z2019-03-29T07:59:08ZCDS support team

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

cds-question@unistra.frgalaxiesinfrared-sourcessupernovaeThe nearby ultra-luminous infrared galaxy (ULIRG) Arp 220 is an excellent laboratory for studies of extreme astrophysical environments. For 20 years, Very Long Baseline Interferometry (VLBI) has been used to monitor a population of compact sources thought to be supernovae (SNe), supernova remnants (SNRs) and possibly active galactic nuclei (AGNs). SNe and SNRs are thought to be the sites of relativistic particle acceleration powering the star formation induced radio emission, and are hence important for studies of e.g. the origin of the FIR-radio correlation. In this work we aim for a self-consistent analysis of a large collection of Arp 220 continuum VLBI data sets. With more data and improved consistency in calibration and imaging, we aim to detect more sources and improve source classifications with respect to previous studies. Furthermore, we aim to increase the number of sources with robust size estimates, to analyse the compact source luminosity function (LF), and to search for a luminosity-diameter (LD) relation within Arp 220. Using new and archival VLBI data spanning 20 years, we obtain 23 high-resolution radio images of Arp 220 at wavelengths from 18cm to 2cm. From model-fitting to the images we obtain estimates of flux densities and sizes of all detected sources. The sources are classified in groups according to their observed lightcurves, spectra and sizes. We fit a multi-frequency supernova lightcurve model to the object brightest at 6cm to estimate explosion properties for this object.2019A&A...623A.173Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/623/A173CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/641/763 : UBVI photometry for Arp 220 star clusters (Wilson+, 2006)J/A+A/493/481 : Maps of Arp 220 (Aalto+, 2009)J/ApJ/799/10 : Arp 220 6 and 33GHz images (Barcos-Munoz+, 2015)J/A+A/590/A25 : Arp 220 HCN and HCO^+^ data cubes (Martin+, 2016)J/A+A/593/A86 : Arp 220 LOFAR radio images at 150MHz (Varenius+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/623/A173https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/623/A173http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/623/A173https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/623/A173https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/623/A173http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/623/A173GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/623/A173/catalog (Compact continuum sources detected in Arp 220)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/623/A173/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/623/A173/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/623/A173/catalog?GETtext/xml+votable180.050000true233.73878042359523.50314780958280.005555555555555556Cone search capability for table J/A+A/623/A173/list (List of fits images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/623/A173/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/623/A173/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/623/A173/list?GETtext/xml+votable180.050000true233.7387223.503150.0055555555555555566/86733.313034785154005e-24 3.313034785154005e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/623/A173?format=asciiInfrareddefaultJ/A+A/623/A173/catalogCompact continuum sources detected in Arp 220recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameGalaxy name (oRA+oDE, from table2.dat)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainSizeStacked sizedegphys.angSizedoubleFluxStacked fluxJyphot.flux.density;em.radiodoubleDetBandsDetected in stacked bandsmeta.notecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/A+A/623/A173/table2List of the 97 sources analysed in this workrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintoRAOffset in right ascension from RA=15:34:57, DE=+23:30:11 (J2000)spos.eq.ra;arith.difffloatoDEOffset in declination from RA=15:34:57, DE=+23:30:11 (J2000)spos.eq.dec;arith.difffloatLNameLegacy namemeta.idcharClassClassmeta.code.classcharl_F6cmLimit flag on F6cmmeta.code.errorcharF6cmFlux density at 6cm measured by fitting a spherical shell to BB335BuJyphot.flux.density;em.radio.3-6GHzinte_F6cm? rms uncertainty on F6cmuJystat.errorintnullableDiam? Average diameter (1)masphys.angSize;stat.meanfloatnullablee_Diam? rms uncertainty on average diametermasstat.errorfloatnullableJ/A+A/623/A173/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.mainNx[8192] Number of pixels along X-axismeta.numberintNy[8192] Number of pixels along Y-axismeta.numberintObs.dateObservation datetime.epoch;obsnullableFreqObserved frequencyGHzem.freqdoublesizeSize of FITS fileKibytephys.size;meta.fitsintFileNameName of FITS file, in subdirectory fitsimagesmeta.id;meta.fitscharTitleTitle of the FITS filemeta.title;meta.fitschar