J/ApJ/405/94ivo://CDS.VizieR/J/ApJ/405/94doi:10.26093/cds/vizier.14050094CDSWise M.W.O'Connell R.W.Bregman J.N.Roberts M.S.2013-03-05T06:34:09Z1998-09-19T16:12:48ZCDS support team

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

cds-question@unistra.frgalaxy-clustersinfrared-sourcesinfrared-astronomyspectroscopyWe have analyzed IRAS image data using a random position, multiple-aperture photometry method to study diffuse far-infrared emission for a sample of 56 clusters of galaxies at 60 and 100um. Five of the clusters in the sample exhibit excess far-infrared emission, but at low levels of significance. For A496 (Perseus) and MKW 1, this emission appears to be associated with a strong point source: in A2344, the observed excess is probably due to a foreground cirrus cloud. Two clusters, A262 and A2670, show evidence for extended diffuse emission. This emission is unlikely to be due to point sources associated with the clusters. In these two clusters, the diffuse emission shows evidence of being extended along the cluster's major axis. Far-infrared maps at 60 and 100um are presented for these five clusters. We find that contamination due to diffuse Galactic cirrus represents the major source of uncertainty in the measurement of far-infrared emission. The mean cluster fluxes for the sample as a whole are 44 and 107mJy for a 4' diameter aperture at 60 and 100um, respectively. The corresponding fluxes for a 10' diameter aperture are 138 and 253mJy at 60 and 100um. Photometry for the entire sample shows statistical evidence for excess emission at 60um associated with clusters in apertures 4' and 10' in diameter. This result is unlikely to be caused by random sampling errors. The flux distributions are analyzed for evidence that excess far-infrared radiation correlates with cluster environmental characteristics. Although we find evidence that poorer X-ray clusters are stronger far-infrared emitters, this result is tentative owing to the small sample sizes involved. The far-infrared luminosities, dust temperatures, and dust masses which these results imply are also presented. Finally, the origin and possible heating mechanism for dust in the intracluster medium is discussed.1993ApJ...405...94Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/405/94CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)II/156 : IRAS Faint Source Catalog, |b| > 10, Version 2.0 (Moshir+ 1989)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/405/94https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/405/94http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/405/94https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/405/94https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/405/94http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/405/94GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/405/94/table3 (Extracted point sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/405/94/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/405/94/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/405/94/table3?GETtext/xml+votable180.050000true26.4944935.538790.0055555555555555565/425 565 586 608 6802 6/1675 1677 1678 1679 1690 1697 1699 1705 1708 1712 1714 2173 2174 2175 2436 17300 27159 27164 27165 27167 27202 27232 27233 485251.9864425968556103e-21 3.3107421909657627e-21https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/405/94?format=asciiInfrareddefaultJ/ApJ/405/94/table3Extracted point sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster namemeta.id.parentcharRA1950Right ascension (1950)pos.eq.ra;meta.mainDE1950Declination (1950)pos.eq.dec;meta.mainPSCPoint Source designation, generally not in IRAS-PSC (Cat. <II/125>)meta.id;meta.maincharF60umExt? Extracted point source 60um fluxJyphot.flux.density;em.IR.30-60umfloatnullableF60umPSCIRAS-PSC or FSS (Cat. <II/156>) 60um fluxJyphot.flux.density;em.IR.30-60umfloatF100umExt? Extracted point source 100um fluxJyphot.flux.density;em.IR.60-100umfloatnullableF100umPSCIRAS-PSC or FSS 100um fluxJyphot.flux.density;em.IR.60-100umfloatr/rARadius in Abell radiusphys.angSize;srcfloat_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed