BEGIN:VCALENDAR VERSION:2.0 PRODID:-//IAP calendar product//iap.fr// CALSCALE:GREGORIAN X-WR-CALNAME:IAP Journal Club: Galaxies BEGIN:VTIMEZONE TZID:Europe/Paris BEGIN:STANDARD DTSTART:19961027T030000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=10 TZNAME:CET TZOFFSETFROM:+0200 TZOFFSETTO:+0100 END:STANDARD BEGIN:DAYLIGHT DTSTART:19810329T020000 RRULE:FREQ=YEARLY;BYDAY=-1SU;BYMONTH=3 TZNAME:CEST TZOFFSETFROM:+0100 TZOFFSETTO:+0200 END:DAYLIGHT END:VTIMEZONE BEGIN:VEVENT SUMMARY:Probabilistic source classification in the era of large photometri c surveys DTSTART;TZID=Europe/Paris:20260219T113000 DTEND;TZID=Europe/Paris:20260219T123000 DTSTAMP:20260219T112100Z UID:2026-02-1911:30:00+00:09"Probabilisticsourceclassificationintheeraofla rgephotometricsurveys"_VfCwqeHy9mzrx1hK3YhI DESCRIPTION:Meriam Ezziati\nInstitut d'Astrophysique de Paris\, Paris\, Fr ance\n\n\nAbstract: The discovery of quasars at z > 7 in wide-field photom etric surveys requires statistical methods capable of separating rare high -redshift sources from numerous contaminants such as brown dwarfs and inte rmediate-redshift galaxies. I will present Owl-z\, a Bayesian classificati on tool developed for the probabilistic selection of high-redshift quasars in the Euclid Wide Survey.\n\nOwl-z computes posterior probabilities by c ombining multi-band photometry with prior models of quasars and contaminan ts\, enabling a controlled trade-off between completeness and purity throu gh an adjustable probability threshold.\n\nUsing Euclid simulations spanni ng 7 = z = 12 and 18 = Hmag = 24.5\, Owl-z achieves high completeness and purity for bright sources with limited redshift dependence. Its applicatio n to Euclid observations demonstrates robust performance on real data and effective characterization of contaminants.\n\nOwl-z provides a transparen t and adaptable probabilistic framework for efficient high-redshift quasar selection in large photometric surveys.\n LOCATION:Salle Entresol Daniel Chalonge END:VEVENT BEGIN:VEVENT SUMMARY:Alignments of galaxies\, gas\, and AGN jets in cosmic filaments DTSTART;TZID=Europe/Paris:20260226T113000 DTEND;TZID=Europe/Paris:20260226T123000 DTSTAMP:20260226T112100Z UID:2026-02-2611:30:00+00:09"Alignmentsofgalaxies\,gas\,andAGNjetsincosmic filaments"_bfF708rY2Gz9xfWhO8eg DESCRIPTION:Lyla Jung\nOxford Astroph.\, Dept. Physics\, Univ. Oxford\, Ox ford\, Grande Bretagne\n\n\nAbstract: Galaxies form and grow while embedde d in the cosmic web. The orientations of galaxy stellar distributions\, HI spin axes\, and AGN jets encode information about how the large-scale env ironment influences galaxy evolution\, gas accretion\, and black hole grow th. In this seminar\, I will present recent observational results from LOF AR and MeerKAT surveys on how cosmic filaments shape galaxy properties obs ervable at radio frequencies. By comparing the orientations of AGN jets re lative to their host galaxies\, we find evidence that black holes in massi ve filament galaxies experience chaotic accretion as a result of numerous mergers. On the other hand\, we find observational support for angular mom entum transfer from filaments to low-mass HI galaxies\, potentially throug h gas accretion. I will conclude by discussing the implications of these f indings for galaxy and black hole evolution\, and the role of current and future radio surveys in cosmic filament studies.\n LOCATION:Salle des séminaires Évry Schatzman END:VEVENT BEGIN:VEVENT SUMMARY:Euclid & Zoobot: detailed visual galaxy morphology in clusters DTSTART;TZID=Europe/Paris:20260305T113000 DTEND;TZID=Europe/Paris:20260305T123000 DTSTAMP:20260305T112100Z UID:2026-03-0511:30:00+00:09"Euclid&Zoobot:detailedvisualgalaxymorphologyi nclusters"_tCzEdcWQ6mLE2JdrzQuA DESCRIPTION:Pedro Mas Buitrago \nCentro de Astrobiología (tutelles CSIC I NTA)\, Madrid\, Espagne\n\n\nAbstract: The Euclid space mission offers a u nique combination of high spatial resolution and sensitivity\, and large s urvey area that will enable the study of galaxy detailed visual morphology on an unprecedented scale. Using the Euclid Q1 visual morphology catalogu e\, built with the Zoobot neural network and made possible by the efforts of ~10k Galaxy Zoo volunteers who together contributed 2.9M annotations\, we study environmental effects on the morphology of galaxies in a large sa mple of clusters at 0.2 4 based on stacked spec troscopic observations\, which reveal young\, intensely star-forming syste ms characterized by steep UV slopes\, strong optical emission lines\, and low dust attenuation. \n\nTogether\, these results provide new constraints on the physical processes governing star formation\, radiation escape\, a nd black hole growth in the early Universe\, and link individual extreme o bjects such as LRDs to the broader population of early galaxies.\n LOCATION:Salle Entresol Daniel Chalonge END:VEVENT BEGIN:VEVENT SUMMARY:Galaxies JC (TBA) DTSTART;TZID=Europe/Paris:20260326T113000 DTEND;TZID=Europe/Paris:20260326T123000 DTSTAMP:20260326T112100Z UID:2026-03-2611:30:00+00:09Titleandsummarytocome_Cyz9dpynHSnQyrjpz8mZ DESCRIPTION:Albert Sneppen\nCosmic Dawn Center\, Niels Bohr Institute\, Un iversity of Copenhagen\, Copenhague\, Danemark\n\n\n\nhttp://www.iap.fr/vi e_scientifique/journal-clubs/journal-clubs.php?nom=Journal-club_Galaxies&l angue=en&annee=2026 LOCATION:Salle des séminaires Évry Schatzman END:VEVENT BEGIN:VEVENT SUMMARY:Galaxies JC (TBA) DTSTART;TZID=Europe/Paris:20260518T113000 DTEND;TZID=Europe/Paris:20260518T123000 DTSTAMP:20260518T112100Z UID:2026-05-1811:30:00+00:09Titleandsummarytocome_5K5n4mPAqEpBesCdUaXb DESCRIPTION:Denis Burgarella\nLab. Astroph. Marseille (LAM)\, Marseille\, France\n\n\n\nhttp://www.iap.fr/vie_scientifique/journal-clubs/journal-clu bs.php?nom=Journal-club_Galaxies&langue=en&annee=2026 LOCATION:Salle Entresol Daniel Chalonge END:VEVENT END:VCALENDAR