J/AJ/167/49ivo://CDS.VizieR/J/AJ/167/49doi:10.26093/cds/vizier.51670049CDSWittman D.Imani D.Olden R.H.Golovich N.2024-11-06T20:20:32Z2024-06-17T07:44:30ZCDS support team

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

cds-question@unistra.fropen-star-clustersstar-forming-regionsvisible-astronomyh-alpha-photometryStudies of star formation in various galaxy cluster mergers have reached apparently contradictory conclusions regarding whether mergers stimulate star formation, quench it, or have no effect. Because the mergers studied span a range of time since pericenter (TSP), it is possible that the apparent effect on star formation is a function of the TSP. We use a sample of 12 bimodal mergers to assess the star formation as a function of TSP. We measure the equivalent width of the H{alpha} emission line in ~100 member galaxies in each merger, classify galaxies as emitters or nonemitters, and then classify emitters as star-forming galaxies (SFGs) or active galactic nucleus (AGN) based on the [NII] {lambda}6583 line. We quantify the distribution of SFG and AGN relative to nonemitters along the spatial axis defined by the subcluster separation. The SFG and AGN fractions vary from merger to merger but show no trend with TSP. The spatial distribution of SFG is consistent with that of nonemitters in eight mergers, but show significant avoidance of the system center in the remaining four mergers, including the three with the lowest TSP. If there is a connection between star formation activity and TSP, probing it further will require more precise TSP estimates and more mergers with TSP in the range of 0-400Myr.2024AJ....167...49Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/167/49CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/559/606 : Star formation in spectroscopic survey (Carter+, 2001)J/AJ/125/2427 : 1.4GHz flux densities of Abell 2255 galaxies (Miller+, 2003)J/ApJ/772/131 : Musket Ball Cluster redshift catalog (Dawson, 2013)J/MNRAS/450/630 : MC2; SFR in CIZA J2242.8+5301 (Sobral+, 2015)J/ApJS/240/39 : Merging galaxy cluster deep observations (Golovich+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/167/49https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/167/49http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/167/49https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/167/49https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/167/49http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/167/49GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/167/49/table2 (Halpha equivalent width estimates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/167/49/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/167/49/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/167/49/table2?GETtext/xml+votable180.050000true13.960226.34750.0055555555555555566/2813 5483 5569 6039 14225 14227 16024-16026 19449 19451 19935 23378 23384 24733 24735 26166 40564 44008https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/167/49?format=asciiOpticaldefaultJ/AJ/167/49/table2Halpha equivalent width estimatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000[2/341] Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000[-29/67] Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainEW[-159/4.61] Equivalent width in angstroms0.1nmspect.line.eqWidthfloate_EW[0.03/7] Uncertainty in EW0.1nmstat.error;spect.line.eqWidthfloat