Conference talk

Early science from SAMI
James T. Allen
Super Science Fellow, University of Sydney
Croom et al. 2012, MNRAS 421, 872; Fogarty et al. (submitted)
SAMI team
James Allen, Luke Barnes, Amanda Bauer, Kenji Bekki, Mike Birchall,
Joss Bland-Hawthorn, Alyson Brooks, Sarah Brough, Julia Bryant,
Gerald Cecil, Michelle Cluver, Matthew Colless, Warrick Couch, Rob
Crain, Scott Croom, Darren Croton, Roger Davies, Catherine de
Burgh-Day, Francesco Di Mille, Michael Drinkwater, Simon Driver, Niv
Drory, Simon Ellis, Lisa Fogarty, Duncan Forbes, Karl Glazebrook,
Michael Goodwin, Andy Green, Andrew Hopkins, Heath Jones,
Andreas Kelz, Lisa Kewley, Iraklis Konstantopoulos, Baerbel
Koribalski, Maritza Lara-Lopez, Jon Lawrence, Geraint Lewis, Angel
Lopez-Sanchez, Smriti Mahajan, Sarah Martell, Jeremy Mould, Simon
Mutch, Matt Owers, Quentin Parker, Gergory Poole, Chris Power,
Michael Pracy, Justin Read, Samuel Richards, Aaron Robotham,
Elaine Sadler, Sebastian Sanchez, Julia Scharwaechter, Nic Scott,
Rob Sharp, Rachel Somerville, Sarah Sweet, Edward Taylor, Jakob
Walcher, Lutz Wisotzki, Ivy Wong
James T. Allen
13th September 2012
SAMI
• 13 hexabundles
• Each bundle has 61 fibres
• Fibres have 1.6” diameter
• Hexabundles have 14.9” FoV
• Feeds the AAOmega spectrograph
• Blue 370-570nm R~1700; Red 640-750nm R~4700
• Will be upgraded at end of 2012
James T. Allen
13th September 2012
The SAMI survey(s)
• Pilot survey: 10 nights in September/October,
>100 galaxies
• Full survey: proposal to observe ~500 galaxies
next semester, with 3000+ to follow
• Broad range of science goals including
kinematics, spatially-resolved stellar
populations, star formation, AGN feedback,
abundance gradients, effects of environment...
James T. Allen
13th September 2012
ESO 185-G031
•z = 0.016
•Distance 68 Mpc
•Fibre 540 pc
•FoV 5070 pc
•SFR ~ 1.7 M /yr
•SFR surface density ~ 0.24 M /yr/kpc
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James T. Allen
2
13th September 2012
SAMI observations
• 4.5hr dithered + 1.5hr pointed observations
from July 2011 commissioning data
James T. Allen
13th September 2012
Kinematics
James T. Allen
13th September 2012
Emission line maps
• Strong increase in [NII]/Ha seen when moving
away from the plane of the disc
• Similar pattern seen in [SII]/Ha, [OI]/Ha and
[OIII]/Hb
James T. Allen
13th September 2012
Ionisation diagnostics
• Outer regions are not consistent with
photoionisation by stars
• Single aperture of any size would not see this
signal
James T. Allen
13th September 2012
Acceleration mechanism
• Ionisation diagnostic diagrams are somewhat
ambiguous, but are a closer match to a wind
driven by star formation than AGN
• Star formation rate density is sufficient to
launch a wind
• Doesn’t appear in SUMSS or AT20G radio
catalogues, suggesting not AGN
• Most likely explanation: wind driven by star
formation
James T. Allen
13th September 2012
SDSS J152429.55+082223
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James T. Allen
Continuum
Ha
13th September 2012
Emission lines
[NII]
[NII]/Ha
[OIII]/Hb
Ha
[NII]/Ha
James T. Allen
13th September 2012
Kinematics
[NII]/Ha
[NII]/Ha
Ha width
Gas kinematics
Stellar kinematics
James T. Allen
13th September 2012
More data coming in now!
James T. Allen
13th September 2012
Summary
• Outflowing material and extended emission
discovered in two objects in SAMI
commissioning data
• Could not have been observed in single-fibre
spectrum of any aperture
• SAMI survey will provide many more
serendipitous discoveries, as part of large
statistically-robust sample
James T. Allen
13th September 2012