Download pptx - Galaxy and Mass Assembly (GAMA) Survey Sarah Brough Sarah Brough - Australian Astronomical Observatory

Sarah Brough - Australian Astronomical Observatory

Galaxy and Mass Assembly (GAMA) Survey

Sarah Brough


GAMA Team:


• An r-band selected redshift survey:– r < 19.8mag– Six regions each ~5x12 deg– ~1000 redshift targets per sq deg (2dFGRS~120, SDSS~70)– 96% complete in redshifts– Testing ΛCDM via halo mass function, galaxy merger rates, and star

formation efficiency– Total allocation 178 nights

• A multi-wavelength study of galaxies:– FUV,NUV,ugrizYJHK,mid-IR,far-IR,20cm,21cm,1m (AGN, stars, gas, dust)– 1kpc resolution in ugrizYJHK to z<0.1 (structural analysis)– Robust halo masses (internal/external environmental markers)


Baldry et al. 2010, MNRAS

GAMA II


Credit: Rob Sharp (Mount Stromlo)


Driver et al 2009, A&G, 50, 5.12; Driver et al 2011, MNRAS, 413, 971


The GAMA footprint (black rectangles). 2dFGRS (Green), SDSS (grey), WiggleZ (red), Herschel ATLAS (yellow), and VISTA VIKING (purple). Blue circles are NVSS radio continuum sources.


Key Science:• A measurement of the dark matter halo mass function of

groups and clusters using group velocity dispersion measurements. (Robotham et al. 2011, arXiv:1106.1994)

• A comprehensive determination of the galaxy stellar mass function to Magellanic Cloud masses to constrain baryonic feedback processes. (Taylor et al. submitted; Baldry et al. in prep)

• A direct measurement of the recent galaxy merger rates as a function of mass, mass ratio, local environment and galaxy type.

Robotham et al. 2011, arXiv:1106.1994


Robotham et al. 2011, arXiv:1106.1994


Gunawardhana et al. (2011)

Varying IMF?


Baldry et al. (in prep)

Steep upturn seen in stellar mass function even before we get

deep VST data

Stellar Mass Function


First Data Release (Driver et al., MNRAS, 2011):• http://gama-survey.org/• ~110,000 ugrizYHK photometric objects, to r<19.4 and r<19.8 • ~50,000 with redshifts & spectra available in DR1, out to z~0.6

(<z> ~ 0.2)


More science on its way, keep a look out!

The Ultimate Galaxy Database

Opt/near-IR imaging

Stellar MassNucleus Bar

Bulge Mass Disc Mass

Scalelength

Trunc. rad

ColourSersic index

SMBH mass

Opticalspectra

SFRAGN

Age

Metal.

Winds

Far-IR

Dust Mass

Dust Geom.

Attenuation

Radio

HI

Cont.

HI Mass

Dynamical Mass

AGN v SFR

20cm

90cm

Unif.

GANDALF

GALFIT

CAS

UV

Popescu & Tuffs

W21

VST/VISTA

GALEX

AAT

HERSCHEL

GMRT/ASKAP


SURVEY PAPERS: (Driver et al 2009, Robotham et al 2010, Baldry et al 2010, Hill et al. 2011)

SCIENCE:• Galaxy evolution: SFR dependence on environment, merger rate, galaxy type/morphology,

mass, etc. (Brough et al. 2011, Prescott et al. submitted)

• Obscuration, radiation balance between UV/IR, dependence on other galaxy properties, evolution. (Wijesinghe et al. 2011a,b)

• IMF variations? (Gunawardhana et al. 2011)

• Metallicity evolution, dependence on galaxy properties, environment, etc.

• Cluster/group properties, evolution, role in galaxy evolution.

• Relationship between single-fibre galaxy properties and resolved spectroscopic properties from integral-field spectroscopic measurements.

• Stellar/gas inter-relationships (GAMA+DINGO): galaxy fueling/stripping/feedback, etc.

• Stellar mass function, HI mass function, baryonic mass function.

• AGN evolution, feedback mechanisms, (radio continuum from EMU).

• And much, much more!