Triggered Extreme Star Formation in (proto-) Cluster Environments Grant Wilson

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• Triggered Extreme Star Formation in (proto-)
  Cluster EnvironmentsGrant Wilson
• Galaxies 09 - Charlottesville
• 24 September, 2009

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• MS0451.6-0305Subaru R with
• AzTEC contours
• Triggered star formation
• signals of quenching
• metal enrichment of ICM
• SZ contaminate
• 2 mm-detected likely cluster members
• both likely mergers
• Lir5x1011Lo
• 50Mo/yr
• stacking analysis shows that cluster environment
  suppresses star-formation activity in late type
  population,
• however, mid-ir selected population forms stars
  in cluster at same rate as field.

likely cluster members
R2.6Mpc
R1Mpc
Wardlow (submitted)
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AzTEC/ASTE
INAOEDavid Hughes Itziar Aretxaga Daniel
Ferrusca Miguel Velazquez Milagros
Zeballos Alfredo Montana Idalia Hernandez David
Omar Sanchez Emally Aguilar
UMassGrant Wilson Min Yun Stacey Alberts Ryan
Cybulski David Welch Seth Johnson Christina
Williams
Smith CollegeJames Lowenthal
CaltechJamie Bock
UPennKim Scott
CardiffPeter Ade Phil Mauskopf Douglas
Haig Simon Doyle Piers Horner
University of TokyoKotaro Kohno
UColoradoJason Austermann
NAOJRyohei Kawabe Hajime Ezawa
Illinois WesleyanThushara Perera
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Submillimeter Galaxies and Clusters

• Massive, red, dead ellipticals are found in z0
  clusters
• HzRGs are signposts for high-density peaks in
  early universe.
• SMGs with (S1.1mm gt few mJy) are massive galaxies
  undergoing starbursts with SFR1000 Msun/yr

Is it possible to witness the formation (and
epoch of quenching) of massive cluster
ellipticals in the early universe?
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Enhanced Star formation in High-z Structures?
High z Radio Galaxies
High z Quasars
5 arcmin2
Priddey et al. 2008
Stevens et al. 2003
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AzTEC Cluster Evolution Survey (ACES)
ASTE 10m 2007-2008
LMT 50m gt 2010
JCMT 15m 2005
40 low-z clusters, intermediate-z high-z AGN
over-densities (.e.g. LBGs, LAE, ..) between
z0.1 6 (gt200 sq. arcmins/field, s 0.7mJy )

• Are dusty starbursts preferentially found in
  high-density environments?
• If so, can we identify an epoch of the quenching
  of starformation?
• What is the inferred contamination of SZ
  measurements at 1.1mm?

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Blank Field Baseline
AzTEC/SHADES Austermann et al. 2009 0.5 sq
deg. 1-1.4 mJy rms
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Blank Field Baseline
GOODS-S Scott et al. (submitted) - 40 sources
- FDRlt1 - 0.5mJy rms
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AzTEC/ASTE - COSMOS - 193 sources - FDRlt6
- 0.75 sq deg. with rms 1.1mJy
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Blank-Field SMG Number Counts
Scott et al. in prep - 838 sources - 1.74 sq
deg.
(Scott submitted)
(Hatsukade in prep.)
(Wilson in prep.)
(Austermann 2009)
(Perera 2008)
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Blank-Field SMG Number Counts
Scott et al. in prep - 838 sources - 1.74 sq
deg.
(Scott submitted)
(Hatsukade in prep.)
(Wilson in prep.)
(Austermann 2009)
(Perera 2008)
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ACES Biased Field Targets
HzRGs
Clusters
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(No Transcript)
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HzRG Field SMG Number Counts
Zeballos et al.(in prep) - 683 sources -
0.95 sq deg.
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HzRG Field SMG Number Counts
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No apparent excess in bright sources vs redshift
N (gt2mJy)/sq. deg.
N (gt4mJy)/sq. deg.
z
z
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HzRG Field SMG Number Counts (rlt3)
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Orientation with respect to radio jet
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Summary

• Blank field SMG number counts
  (0.5ltS1.1mmlt10mJy) now tightly constrained.
• No projected excess of SMGs identified in set of
  16 HzRG fields on scales of few to 5 Mpc.
• excesses on scales less than 1 Mpc still
  possible
• duty cycle of starburst may make catching them
  unlikely
• Clusters are being analyzed now
• lensing and SZ contamination complicate
  characterization
• Redshift Receiver (z) AzTEC/LMT (5-8
  resolution) will significantly enhance this study.

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Blank-Field SMG Number Counts
Scott et al. in prep - 838 sources - 1.74 sq
deg.