J/MNRAS/514/3294ivo://CDS.VizieR/J/MNRAS/514/3294doi:10.26093/cds/vizier.75143294CDSBickley R.W.Ellison S.L.Patton D.R.Bottrell C.Gwyn S.Hudson M.J.2025-08-11T20:18:58Z2025-06-06T13:28:56ZCDS support team

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

cds-question@unistra.frinteracting-galaxiesvisible-astronomyspectroscopyphotometryastronomical-object-identificationastrometryredshiftedstellar-massesstar-forming-regionsclassificationThe importance of the post-merger epoch in galaxy evolution has been well documented, but post-mergers are notoriously difficult to identify. While the features induced by mergers can sometimes be distinctive, they are frequently missed by visual inspection. In addition, visual classification efforts are highly inefficient because of the inherent rarity of post-mergers (~1 per cent in the low-redshift Universe), and non-parametric statistical merger selection methods do not account for the diversity of post-mergers or the environments in which they appear. To address these issues, we deploy a convolutional neural network (CNN) that has been trained and evaluated on realistic mock observations of simulated galaxies from the IllustrisTNG simulations, to galaxy images from the Canada France Imaging Survey, which is part of the Ultraviolet Near Infrared Optical Northern Survey. We present the characteristics of the galaxies with the highest CNN-predicted post-merger certainties, as well as a visually confirmed subset of 699 post-mergers. We find that post-mergers with high CNN merger probabilities [p(x)>0.8] have an average star formation rate that is 0.1 dex higher than a mass- and redshift-matched control sample. The SFR enhancement is even greater in the visually confirmed post-merger sample, a factor of 2 higher than the control sample.2022MNRAS.514.3294Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/514/3294CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/486/390 : Morphology of 16908 SDSS Stripe 82 galaxies (Bottrell+, 2019)J/A+A/582/A21 : Merging galaxies (mis)alignments (Barrera-Ballesteros+, 2015)J/AJ/130/1516 : MCG pairs and triples of galaxies (De Propris+, 2005)J/ApJS/221/11 : CANDELS visual classifications for GOODS-S (Kartaltepe+,2015)J/ApJS/210/3 : SDSS bulge, disk and total stellar mass estimatesII/294 : The SDSS Photometric Catalog, Release 7II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cas.sdss.org/dr7/en/tools/explore/ : SDSS-DR7 explore toolhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/514/3294https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/514/3294http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/514/3294https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/514/3294https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/514/3294http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/514/3294GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/514/3294/table2 (The hybrid visual-CNN CFIS post-merger catalogue)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/514/3294/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/514/3294/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/514/3294/table2?GETtext/xml+votable180.050000true118.5704018540.124698760.0055555555555555565/1363 2293 2433 2860 2945 7159 6/4954-4956 4970 4972 4974 4976 4978 4981 4986 4990 5021-5022 5029 5036-5038 5042 5046 5055-5056 5068 5073-5074 5079 5090-5093 5097 5100 5102-5103 5105 5107 5110-5113 5115-5117 5206-5207 5211 5213 5221 5223 5225 5234 5237-5238 5243-5244 5246 5267 5271 5274 5276-5277 5279 5292 5297 5301 5305 5322 5343-5344 5353 5356-5357 5375 5379 5381-5383 5388-5389 5391 5398 5400-5401 5403 5405 5407 5409 5413-5414 5420 5427 5429 5431 5441 5445 5449-5450 5459-5460 5465 5467 5469 5471 5473 5478 5482 5484 5486 5506 5508 5514 5517 5523-5524 5537 5540 5555 5557 5559 5562 5567 5570 5572 5576 5603 5612 5632-5633 5638 5640 5650 5652 5666 5673 5678 5680-5681 5686 5696 5699 5702 5708 5711 5714-5716 5721-5722 5733 5744-5745 5748 5750-5751 5760-5761 5766 5768 5770 5777 5787 5789 5795 5798-5799 5802 5805 5821 5824 5836 5842 5844 5847-5848 5859 5863 5866 5872-5873 5889 5898 5902-5905 5907 5912 5925 5928 5930 5934 5952 5990 5996 6017-6020 6024-6025 6027 6048 6228 6259-6260 6262 6264 6270 6359 6367 6403-6404 6414 6424 6434 6441 6443-6444 6455 6458 6463 6472-6473 6475-6477 6480-6481 6485 6493-6494 6501 6506 6520-6521 6524 6528 6531 6535 6538-6539 6541 6545 6548 6552 6555 6563 6568 6574 6581 6583-6584 6588 6593 6602 6604 6610-6611 6614-6617 6619 6622 6627 6636-6637 6649 6912 6917 7168 7170 7174 7179 7184 7198 7205 7232 7296 7308-7309 7311-7312 7321 7324 7331 7337 7352 7354 9050-9053 9077 9086 9169 9171 9180-9181 9207 9212 9279 9316-9317 9321 9328-9329 9331 9333 9341 9343 9366 9379 9381 9383 9388 9391 9397 9402-9403 9406 9408-9409 9413 9422 9425 9432 9436 9438 9445 9448-9449 9452 9454-9455 9459 9463 9468 9473 9480-9481 9483 9506-9507 9510 9512-9513 9530 9603 9728 9737 9743 9745-9746 9751 9754-9755 9757 9759 9765-9766 9768 9787-9788 9790 9792 9797 9802 9804 9818 9840-9841 9856 9858 9861 9864 9870 9876 9885 9893 9897 9901 9904 9907 9909 9912 9928 9981 10016 10086 10092 10180 10340 10348-10349 10383 10394 10399 10404 10407 10409 10412-10414 10419-10422 10426 10430 10438 10473 10476 10573 10583 10588-10589 10594 10596 10600 10605 10607-10608 10610 10616 10684 10735 10741-10742 10746-10747 10750 10755 10757-10759 10762 10774 10776-10777 10779 10782 10788 10791 10793 10799 10809-10810 10814-10815 10849 10852 10875 10877-10878 10881 10886 10893 10900 10902-10903 10908 10911-10912 10916 10920 10922 10929 10944 10961 11030 11045-11046 11048 11056 11075 11094-11095 11097-11098 11101 11104 11106 11111 11115 11118 11126-11127 11129 11131 11266-11267 11308 11310 11315-11316 11322-11323 11328 11331 11371 11387 11398 11400 11402 11410 11420-11422 11426 11428 11435 11438-11439 11446-11447 11451 11453 11467-11468 11482 11498-11500 11502 11505 11784-11786 11790 11792 11794 11797-11800 11808 11810 11817 11841 11846 11849 28506 28517 28524 28526 28531 28535 28538 28542 28565-28567 28571-28573 28581 28587 28591 28593-28595 28599 28602-28603 28605 28608-28609 28613 28628 28631-28632 28634 28640-28642 28650 28653-28654 28656 28664-28666 28670 32682https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/514/3294?format=asciiOpticaldefaultJ/MNRAS/514/3294/table2The hybrid visual-CNN CFIS post-merger cataloguerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentification number from CFISDR2/SDSS-DR7 merge resulting of 168597 galaxies sample (NbrID)meta.id;meta.mainintobjIDSDSS-DR7 unique object identifier (objID)meta.id.assocRAJ2000Right ascension from SDSS-DR7 (J2000) (ra)degpos.eq.ra;meta.mainDEJ2000Declination from SDSS-DR7 (J2000) (decl)degpos.eq.dec;meta.mainzSpectroscopic redshift from SDSS-DR7 (z_spec)src.redshiftdoublelogM*Median value of the total stellar mass (total_mass_med)log(solMass)phys.mass;stat.mediandoubleSFRMedian value of the total star forming (total_sfr_med)log(solMass.yr**-1)phys.SFR;stat.mediandoublef_ID[1.0] Flag to indicate being part of the first categorie which is CNN [p(x)>0.75] and positive classifications by the authorsmeta.code.classfloatrmagThe CFIS r-band Petrosian apparent magnitude (petromag_r)magphot.mag;em.opt.RfloatCNNThe CNN post-merger classification probability (CNNprediction)stat.fit.goodness;src.classdoubleSimbadNameSimbad column added by the CDSmeta.idcharnullable