IAU Commission 28 - Galaxies

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IAU Commission 28 - Galaxies

• ?Highlights 2005-08
• ?Conferences
• ?New OC

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1- Star formation with Spitzer and Galex
M51
24m and Ha tracers of SFR Messier 51 Kennicutt
et al 2007 Depends on the pixel average, Best on
520pc
Gradual process of SF decline with time gas
exhaustion?
Star formation increases with z Noeske et al 2007
2905 galaxies AEGIS Groth Strip Blue 24m
Emission lines Green no 24m SF from EM, red
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2- Extended UV (XUV) disks
Thilker et al 2007
Frequent extended UV Might be episodic gas
accretion
Gil de Paz et al 2007
Abundances in the outer parts are not pristine
material, but like 1Gyr old disks
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3- Colour Bimodality and downsizing
Daddi et al 2007
30 of z2 galaxies detected in 24m show excess
of mid-IR star formation. Stacked X-ray
reveal Compton-thick AGN Fraction increases with
mass, and with z 60 Mgt 1011Mo
Origin of bimodality? Cold gas accretion at low
M Quenching of star formation MgtMo Dekel
Birnboim 2006
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4- Evolution and High-z galaxies
Tacconi et al 2006
Kristen et al 08, Genzel et al 08 Distinguishing
between mergers and normal galaxies?
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5- Scaling laws and time evolution
Sheth et al 2008
Trachternach et al 2009 Baryonic
Tully-Fisher Constraint on triaxiality
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6- Numerical simulations
Satellite problem more accute
Via Lactea Diemand et al 2007
Di Matteo et al 2007, 08 Retrograde mergers
produce more starbursts Globally, only a few of
starburst due to mergers
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Conferences
IAU S230 Populations of High Energy Sources in
Galaxies, Aug 2005, Dublin, Ir 11th
Latin-American Regional IAU Meeting (LARIM-2005),
Dec05, Pucon, Chile IAU S235 Galaxy Evolution
across the Hubble Time, Aug 2006, Prague,
Cz JD07 The Universe at zgt6, Aug 2006, Prague,
Cz IAU S238 Black Holes -- from Stars to
Galaxies, Aug 2006, Prague, Cz IAU S241 Stellar
Populations as Building Blocks of Galaxies, Dec
2006, Canaries, Sp IAU S244 Dark Galaxies and
Lost Baryons, June 2007, Cardiff, UK IAU S245
Formation and Evolution of Galaxy Bulges, July
2007, Oxford, UK IAU S254 The Galaxy Disk in
Cosmological Context, June 2008 Copenhagen, Dk
IAU S255 Low-Metallicity Star Formation, June
2008, Rapallo, Liguria, It IAU S256 The
Magellanic System Stars, Gas, and Galaxies, July
2008, Keele, UK 100 other meetings relevant
to Galaxies (cited in the report, 2005-08) 10
times more than IAU!
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Commission actions
New Organising Committee for 2009-2012 President
Roger Davies (UK) Vice President Jay Gallagher
(USA) New OC members Stephane Courteau
(Canada) Chanda Jog (India) Sharda Jogee
(USA) Linda Tacconi (Germany) Elena Terlevich
(Mex) Continuing OC members Francoise Combes
(F, past-president) Avishai Dekel (Israel) Marijn
Franx (NL) Naomasa Nakai (Japan) Monica Rubio
(Chile)
Main actions Review meeting proposals Propositio
n of Working Groups Large surveys?
IAU GA 2012