J/ApJ/511/595ivo://CDS.VizieR/J/ApJ/511/595doi:10.26093/cds/vizier.15110595CDSHenriksen M.Cousineau S.2000-02-22T08:34:15Z2000-02-22T09:33:30ZCDS support team

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

cds-question@unistra.frgalaxy-clusterssurveysx-ray-sourcesResults are reported from the first survey of X-ray emission from galaxies in pairs. The sample consists of 52 pairs of galaxies from the Catalog of Paired Galaxies (Cat. <VII/77>) whose coordinates overlap the ROSAT Position Sensitive Proportional Counter pointed observations. The mean observed log(L_x_) for early-type pairs is 41.35+/-0.21, while the mean log(L_x_) predicted using the (L_X_-L_b_) relationship for isolated early-type galaxies is 42.10+/-0.19. With 95% confidence, the galaxies in pairs are underluminous in the X-ray, compared with isolated galaxies, for the same L_b_. A significant fraction of the mixed pair sample also appears similarly underluminous. A spatial analysis shows that the X-ray emission from pairs of both types typically has an extent of 10 - 50 kpc, much smaller than the group intergalactic medium, and thus likely originates from the galaxies. CPG 564, the most X-ray luminous early-type pair, 4.7x10^42^ergs/s, is an exception. The extent of its X-ray emission, greater than 169 kpc, and HWHM, {~}80 kpc, is comparable to that expected from an intergalactic medium. The sample shows only a weak correlation, {~}81% confidence, between L_X_ and L_b_, presumably due to variations in gas content within the galaxies. No correlation between L_X_ and the pair velocity difference ({delta}v), separation ({delta}r), or far-infrared luminosity (L_fir_) is found, although the detection rate is low, 22%.1999ApJ...511..595Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/511/595CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/77 : Catalogue of isolated pairs of galaxies in northern hemisphereJ/other/ApL/30.1 : Southern catalogue of isolated pairs extensionVII/113 : Catalogued Galaxies + QSOs observed in IRAS Survey,II/156A : 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/511/595https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/511/595http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/511/595https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/511/595https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/511/595http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/511/595GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/511/595/table1 (Data for spiral galaxy pairs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/511/595/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/511/595/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/511/595/table1?GETtext/xml+votable180.050000true2.637528.996110.005555555555555556Cone search capability for table J/ApJ/511/595/table2 (Data for early-type galaxy pairs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/511/595/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/511/595/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/511/595/table2?GETtext/xml+votable180.050000true12.129171.354720.005555555555555556Cone search capability for table J/ApJ/511/595/table3 (Data for mixed galaxy pairs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/511/595/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/511/595/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/511/595/table3?GETtext/xml+votable180.050000true43.79167-0.178060.005555555555555556ROSAT6/4215 4322 4439 4691 4718 4891 5367 5536 5919 6078 6219 6241 7344 7585 7606 7653 8072 8186 8641 8839 9707 9853 10544 11253 12404 13426 13459 16045 17748 18113 18212 19432 19940 20323 20336 23222 23296 23893 23921 25852 25907 26451 27514 27652 27741 27907 27944 27973 28221 30044 32620 32683https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/511/595?format=asciiX-raydefaultJ/ApJ/511/595/table1Data for spiral galaxy pairsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intCPGCatalog of Paired Galaxies number (1)intMorphGalaxy morphological type from NEDcharRAJ2000Right Ascension (J2000)DEJ2000Declination (J2000)Sep? Separation of Galaxy pairsarcminfloatnullableVelRecessional velocitykm/sintLumBBlue luminosity (10^43^ergs/s)1e+36WfloatCnts? Background subtracted Xray counts (10^-2^/s)0.01count.s**-1floatnullablee_Cnts? 1 sigma error in Cnts (10^-2^/s)0.01count.s**-1floatnullablel_LumXlimit on LumXcharLumX? Xray luminosity from 0.25-2 KeV (10^41^ergs/s)1e+34WfloatnullableLumIR? Log of the Far IR luminosity (erg/s) (2)log(1e-07W)floatnullableJ/ApJ/511/595/table2Data for early-type galaxy pairsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intCPGCatalog of Paired Galaxies number (1)intMorphGalaxy morphological type from NEDcharRAJ2000Right Ascension (J2000)DEJ2000Declination (J2000)Sep? Separation of Galaxy pairsarcminfloatnullableVelRecessional velocitykm/sintLumBBlue luminosity (10^43^ergs/s)1e+36WfloatCnts? Background subtracted Xray counts (10^-2^/s)0.01count.s**-1floatnullablee_Cnts? 1 sigma error in Cnts (10^-2^/s)0.01count.s**-1floatnullablel_LumXlimit on LumXcharLumX? Xray luminosity from 0.25-2 KeV (10^41^ergs/s)1e+34WfloatnullableLumIR? Log of the Far IR luminosity (erg/s) (2)log(1e-07W)floatnullableJ/ApJ/511/595/table3Data for mixed galaxy pairsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.intCPGCatalog of Paired Galaxies number (1)intMorphGalaxy morphological type from NEDcharRAJ2000Right Ascension (J2000)DEJ2000Declination (J2000)Sep? Separation of Galaxy pairsarcminfloatnullableVelRecessional velocitykm/sintLumBBlue luminosity (10^43^ergs/s)1e+36WfloatCnts? Background subtracted Xray counts (10^-2^/s)0.01count.s**-1floatnullablee_Cnts? 1 sigma error in Cnts (10^-2^/s)0.01count.s**-1floatnullablel_LumXlimit on LumXcharLumX? Xray luminosity from 0.25-2 KeV (10^41^ergs/s)1e+34WfloatnullableLumIR? Log of the Far IR luminosity (erg/s) (2)log(1e-07W)floatnullable