J/MNRAS/431/1107ivo://CDS.VizieR/J/MNRAS/431/1107doi:10.26093/cds/vizier.74311107CDSGendre M.A.Fenech D.M.Beswick R.J.Muxlow T.W.B.Argo M.K.2024-07-21T20:14:29Z2015-07-27T15:07:12ZCDS support team

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

cds-question@unistra.frgalaxiesradio-sourcesThis paper presents the results of the 2009-2010 monitoring sessions of the starburst galaxy M82, obtained with the Multi-Element Radio-Linked Interferometer Network (MERLIN) at 5GHz and e-MERLIN at 6GHz. Combining several 5GHz MERLIN epochs to form a map with 33.0{mu}Jy/bm noise level, 52 discrete sources, mostly supernova remnants and HII regions, are identified. These include three objects which were not detected in the 2002 5GHz MERLIN monitoring session: supernova SN2008iz, the transient source 43.78+59.3, and a new supernova remnant shell. Flux density variations, in the long (1981 to 2010), medium (2002 to 2010) and short (2009 to 2010) term are investigated. We find that flux densities of supernova remnants (SNRs) in M82 stay constant in most of the sample (~95 per cent), although the distributions of flux density variations show an offset from zero. This is consistent with a slight statistical reduction in flux density of the source distribution. In addition, aside from SN2008iz and the well-known variable source 41.95+57.5, two sources display tentative evidence for short- and medium-term variations over the period 2009-2010. These sources are amongst the most compact SNR in M82. These flux density variations could be due to changes in the circumstellar and interstellar medium in which the shocks travel.2013MNRAS.431.1107Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/431/1107CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/391/1384 : Deep MERLIN 5GHz radio sources in M82 (Fenech+, 2008)J/MNRAS/414/1329 : M82 X-ray sources long-term variability (Chiang+, 2011)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/431/1107https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/431/1107http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/431/1107https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/431/1107https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/431/1107http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/431/1107GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/431/1107/sources (Radio-sources in M82: MERLIN/e-MERLIN monitoring and combinned/averaged normalized 5GHz fluxes (see section 3.2 of the paper))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/431/1107/sources?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/431/1107/sources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/431/1107/sources?GETtext/xml+votable180.050000true148.949458369.67880560.0055555555555555566/76063.313034785154005e-24 3.313034785154005e-24https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/431/1107?format=asciiRadiodefaultJ/MNRAS/431/1107/sourcesRadio-sources in M82: MERLIN/e-MERLIN monitoring and combinned/averaged normalized 5GHz fluxes (see section 3.2 of the paper)Seq[1/52] Sequential numbermeta.recordintprimaryNameRadio-source name (SS.ss+SS.ss, B1950) (1)meta.id;meta.maincharn_Name[ab] Transient or previously undetected (2)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSpAveraged peak flux density at 5GHz (mJy/beam); the mean error is 0.01mJy.mJyphot.flux.density;em.radio.3-6GHzfloatSiIntegrated flux density at 5GHzmJyphot.flux.density;em.radio.3-6GHzfloate_Sirms uncertainty on SimJystat.errorfloatComComments on the type of sourcemeta.note;src.classcharSp09c2009 combined 5GHz peak flux density (mJy/beam)mJyphot.flux.density;em.radio.3-6GHzfloatSi09c2009 combined 5GHz integrated flux densitymJyphot.flux.density;em.radio.3-6GHzfloate_Si09crms uncertainty on Si09cmJystat.errorfloatSp09A? 2009-05-01 5GHz peak flux density (mJy/beam)mJyphot.flux.density;em.radio.3-6GHzfloatnullableSi09A? 2009-05-01 5GHz integrated flux densitymJyphot.flux.density;em.radio.3-6GHzfloatnullablee_Si09A? rms uncertainty on Si09AmJystat.errorfloatnullableSp09B? 2009-05-26 5GHz peak flux density (mJy/beam)mJyphot.flux.density;em.radio.3-6GHzfloatnullableSi09B? 2009-05-26 5GHz integrated flux densitymJyphot.flux.density;em.radio.3-6GHzfloatnullablee_Si09B? rms uncertainty on Si09BmJystat.errorfloatnullableSp09C2009-07-28 5GHz peak flux density (mJy/beam)mJyphot.flux.density;em.radio.3-6GHzfloatSi09C2009-07-28 5GHz integrated flux densitymJyphot.flux.density;em.radio.3-6GHzfloate_Si09Crms uncertainty on Si09CmJystat.errorfloatSp09D? 2009-08-19 5GHz peak flux density (mJy/beam)mJyphot.flux.density;em.radio.3-6GHzfloatnullableSi09D? 2009-08-19 5GHz integrated flux densitymJyphot.flux.density;em.radio.3-6GHzfloatnullablee_Si09D? rms uncertainty on Si09DmJystat.errorfloatnullableSp09E? 2009-09-12 5GHz peak flux density (mJy/beam)mJyphot.flux.density;em.radio.3-6GHzfloatnullableSi09E? 2009-09-12 5GHz integrated flux densitymJyphot.flux.density;em.radio.3-6GHzfloatnullablee_Si09E? rms uncertainty on Si09EmJystat.errorfloatnullableSp09F? 2009-09-25 5GHz peak flux density (mJy/beam)mJyphot.flux.density;em.radio.3-6GHzfloatnullableSi09F? 2009-09-25 5GHz integrated flux densitymJyphot.flux.density;em.radio.3-6GHzfloatnullablee_Si09F? rms uncertainty on Si09FmJystat.errorfloatnullableSp10A? 2010-04-06 5GHz peak flux density (mJy/beam)mJyphot.flux.density;em.radio.3-6GHzfloatnullableSi10A? 2010-04-06 5GHz integrated flux densitymJyphot.flux.density;em.radio.3-6GHzfloatnullablee_Si10A? rms uncertainty on Si10AmJystat.errorfloatnullableSp10B? 2010-12-17 5GHz peak flux density (mJy/beam)mJyphot.flux.density;em.radio.3-6GHzfloatnullableSi10B? 2010-12-17 5GHz integrated flux densitymJyphot.flux.density;em.radio.3-6GHzfloatnullablee_Si10B? rms uncertainty on Si10BmJystat.errorfloatnullableSi02? 2002 5GHz integrated flux density (mJy/beam)mJyphot.flux.density;em.radio.3-6GHzfloatnullablee_Si02? rms uncertainty on Si02mJystat.errorfloatnullableSi05? 2005 5GHz integrated flux density (mJy/beam)mJyphot.flux.density;em.radio.3-6GHzfloatnullablee_Si05? rms uncertainty on Si05mJystat.errorfloatnullablel_alphaLimit flag on alphameta.code.error;pos.eq.racharalpha? Spectral index (3)spect.indexfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlchar