IAU Focus Meeting FM6:
Galactic Angular Momentum

August 20 – 22, 2018

Scientific Rationale:

In this decade, the fundamental role of angular momentum (AM) in galaxy evolution came to new fame. Recent IFU surveys conclude that AM offers a more fundamental, albeit harder to measure, classification of galaxies than the classical Hubble sequence. The precise form of this new AM-based classification remains nonetheless a source of much argument. Many recent hydro-gravitational simulations (e.g. Illustris, EAGLE, Horizon, Magneticum, MAGICC, CLUES, NIHAO) contribute to this discussion, as do most major kinematic observing programs. Prominent examples include optical IFU/IFU-like surveys (e.g. Atlas3D, CALIFA, MaNGA, SLUGGS, PN.S, KROSS, SAMI Survey), interferometric radio surveys (e.g. at the VLA and GMRT) and many more kinematic observations on modern and future instruments (e.g. KMOS, MUSE, SINFONI, HECTOR, ALMA, NOEMA, JWST, SKA-precursors). The strong correlations between AM and morphology, as well as other galaxy properties, raise the question as to how the cosmic evolution of galaxies is paralleled, or even driven, by the evolution of AM. Answers are about to emerge from new high-z IFU observations on 8m-class telescopes, as well as from an array of cosmological simulations. Moreover, ongoing and near-future surveys are about to expand AM science to new scales: for the first time, enough spatially resolved velocity maps are available to systematically study the spatial distribution of the baryon AM in galaxies, which offers an extremely nuanced test of different galaxy evolution models. On large scales, galaxy surveys are about to become large and complete enough to test predicted weak correlations between AM and cosmic large scale structure.


  • The cosmological origin and evolution of angular momentum (AM)
  • New precision measurements of galactic AM using integral field spectroscopy and synthesis imaging
  • Numerical simulations of acquisition, transport, growth and ejection of galactic AM
  • Interpretation of the Hubble morphology sequence in terms of AM
  • The role of AM in cold gas physics, turbulence, winds, clumps, star formation and black holes
  • Alignment of galactic spin and cosmic large scale structure



Abstract list for FM6
Poster list for FM6

Monday, 20. Aug.

AM in the ΛCDM context
room: F1
10:30 - Welcome & Introduction
10:40 - Peebles, James (The gravitational origin of AM – reflections on the history and present situation)
11:03 - Obreja, Aura (Galaxy simulations after the AM catastrophe)
11:20 - Bullock, James (From halos to disks: the physics of AM profiles)
11:37 - somerville, rachel (On the relationship between galaxy and halo size and spin)
11:48 - DeFelippis, Daniel (The evolution of baryonic AM in simulated disk galaxies)

Cosmic evolution and alignment of AM
room: F1
13:30 - Pedrosa, Susana (The fundamental physics of AM evolution in a ΛCDM scenario)
13:53 - Posti, Lorenzo (The AM of galaxies and their haloes as a tracer of galaxy evolution)
14:04 - Athanassoula, Lia (AM and the evolution of disc galaxies)
14:21 - Arianna Di Cintio (Poster overview session)
14:32 - Yang, Xiaohu (Observing various alignment signals of galaxies)
14:49 - Welker, Charlotte (Modelling the cosmic evolution and large-scale alignment of AM)


Tuesday, 21. Aug.

Mass–AM–morphology connection
room: F1
10:30 - Colless, Matthew (Emerging AM physics from kinematic surveys)
10:53 - Fall, Michael (New perspectives on galactic AM, galaxy formation, and the Hubble Sequence)
11:04 - Remus, Rhea-Silvia (Connecting AM, mass and morphology: insights from the Magneticum simulations)
11:21 - Tabor, Martha (Untangling galaxy components: the AM of bulges and disks in the MaNGA survey)
11:32 - Genel, Shy (Accretion and growth of AM in cosmological simulations)
11:49 - Rizzo, Francesca (S0 galaxies are faded spirals: clues from their AM content)

AM in early-type galaxies
room: F1
13:30 - Greene, Jenny (The role of AM in central and satellite ETGs)
13:53 - Cappellari, Michele (Surprises in kinematic observations of ETGs)
14:10 - Foster, Caroline (Spinning galaxies into shape)
14:21 - Choi, Hoseung (Spin evolution of Horizon-AGN ETGs)
14:32 - Brodie, Jean (Understanding the assembly histories of ETGs from the kinematics of stars and GCs)
14:49 - Pulsoni, Claudia (The ePN.S ETG survey – Kinematic diversity and AM at large radii)


Wednesday, 22. Aug.

Substructure, gas and star formation
room: F1
10:30 - Lagos, Claudia (AM evolution of galaxies: the perspective of hydrodynamical simulations)
10:52 - Fraternali, Filippo (Accretion physics and scaling laws of AM in galaxies)
11:08 - Sweet, Sarah (Spatially resolved observations of AM as a tracer of galaxy morphology and history)
11:24 - Murugeshan, Chandrashekar (Does AM regulate HI gas in isolated spirals?)
11:34 - Audibert, Anelise (Cold gas morphology and kinematics in the central kpc of nearby AGN with ALMA)
11:44 - Saha, KANAK (AM transport in lopsided galaxies)

New frontiers: deeper, farther, smaller
room: F1
13:30 - Kareem El-Badry (Stars re-shaping galaxies)
13:52 - Kassin, Susan (The assembly of disk galaxies: from Keck to JWST)
14:08 - Chengalur, Jayaram (Expanding AM measurements to dwarf galaxies)
14:24 - Blyth, Sarah (Future high-redshift observations of HI kinematics)
14:40 - Francois Combes & Eric Emsellem (Conference summary)
14:55 - Closing words


  • Danail Obreschkow (chair), Perth, Australia
  • Francoise Combes, Paris, France
  • Aaron Romanowski, San Jose, USA
  • Rachel Somerville, New Brunswick, USA
  • Roger Davies, Oxford, UK
  • Claude Carignan, Cape Town, South Africa
  • Arianna Di Cintio, Copenhagen, Denmark
  • Chanda Jog, Bengaluru, India
  • Karl Glazebrook, Melbourne, Australia
  • Mark Swinbank, Durham, UK
  • Eric Emsellem, Garching, Germany
  • Patricia Tissera, Santiago, Chile
  • Sebastian F. Sanchez, Mexico City, Mexico
  • Romeel Dave, Cape Town, South Africa
  • Charlotte Christensen, Grinnell, USA
  • Yipeng Jing, Shanghai, China



Danail Obreschkow 


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