The ZFOURGE Survey

Highlights from
ZFOURGE
FourStar Galaxy Evolution Survey
AAO Gemini, Magellan, and Keck Science Symposium
Michael Cowley, 22nd May 2015
ZFOURGE
FourStar Galaxy Evolution Survey
What:
~50 nights on Magellan/
FourStar near-IR camera
5 medium-band filters
Ks broadband
Primary goal: Accurate photo-z of ~30,000
galaxies at z > 1
Galaxy formation and evolution
at z > 1
3 legacy fields:
COSMOS, GOODS-S, UDS
11x11 arcmin^2 each
CANDELS Fields
GOODS-S
COSMOS
UDS
ZFOURGE
FourStar Galaxy Evolution Survey
Medium Band Filters
5-sigma: J1 J2 J3 to 26 AB, Hl Hs to 25 AB, Ks to 25 AB
1-2% redshift uncertainties, σ/(z+1), at 1.5 < z < 3.5
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
NEWFIRM 1.2”
K 12 hours
NMBS
Four-Star 0.4”
K 30 minutes
ZFOURGE
ZFOURGE
FourStar Galaxy Evolution Survey
Old Galaxy Model
ZFOURGE Filters
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
Traditional Filters
Animation: A.Tomczak
ZFOURGE
FourStar Galaxy Evolution Survey
zfourge.tamu.edu
Rebecca Allen
Casey Papovich
Michael Cowley
Eric Persson
Ben Forrest
Ryan Quadri
Karl Glazebrook
Glen Rees
Glenn Kacprzak
Lee Spitler
Nancy Kawinwanichakij
Caroline Straatman
Ivo Labbé (PI)
Vithal Tilvi
Nicola Mehrtens
Adam Tomczak
Andy Monson
Kim-Vy Tran
Themiya Nanayakkara
Pieter van Dokkum
A substantial population of
massive quiescent galaxies at
z~4 from ZFOURGE
Straatman et al. 2014
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
Restframe U-V colour [AB mag]
UVJ Diagram - a HR diagram for galaxies
Quiescent
Dusty
Star-Forming
Unobscured
Star-Forming
Restframe V-J colour [AB mag]
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
Straatman et al. 2014
Massive Quiescent Galaxies at z = 4
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
Sizes of Massive (∼0.8 × 1011M⊙) z=4 galaxies
Size
Star-Forming
Quiescent
Redshift
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
Count
Straatman et al. in prep
Exploring the z=3-4 massive
galaxy population with ZFOURGE:
the prevalence of dusty and
quiescent galaxies
Spitler et al. 2014
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
A mass-limited census at z=3-4
Unobscured
Star-Forming
Dusty Star-Forming
flux (ergs s 1 cm
2
Å 1 )
Quiescent
1
10
1
10
wavelength (micron)
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
1
10
Spitler et al. 2014
A mass-limited sample at z=3-4
log stellar mass
Traditional Limit
Total R-band AB magnitude
Total K-band AB magnitude
Traditional Galaxy Selection
ZFOURGE Galaxy Selection
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
Spitler et al. 2014
Restframe U-V colour [AB mag]
UVJ Diagram: Galaxy Classification
Quiescent
Unobscured
Star-Forming
Dusty
Star-Forming
Restframe V-J colour [AB mag]
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
Spitler et al. 2014
A mass-limited census at z=3-4
Unobscured
Star-Forming
Dusty
Star-Forming
flux (ergs s 1 cm
2
Å 1 )
Quiescent
Diverse population
45% are quiescent
40% are dusty star-forming
15% resemble luminous blue starforming Lyman breaks
1
10
1
10
wavelength (micron)
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
1
10
Spitler et al. 2014
ZFOURGE Catalogue of AGN
Candidates: A Comparison of StarFormation Activity in Active and
Non-active Galaxies
Cowley et al. in prep
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
UVJ colours of AGN hosts
Restframe
U-V colour
[AB mag]
Restframe
U-V [Mag]
Infrared
AGN
Infrared AGN
X-ray
AGN
X-ray AGN
Radio
AGN
Radio AGN
0.2 < z < 0.8
2.0
1.5
1.0
0.5
0
0.5
1.0
1.5
Restframe V-J [Mag]
2.0
0
0.5
1.0
1.5
Restframe V-J [Mag]
2.0
Restframe V-J colour [AB mag]
0
0.5
1.0
1.5
Restframe V-J [Mag]
2.0
INFRARED AGN: Dusty, young, late-type galaxies
RADIO AGN: Old, early-type galaxies
X-RAY AGN: Straddle between the two
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
Cowley et al. in prep
Infrared AGN
X-ray AGN
Radio AGN
Younger Galaxies
Middle-Aged Galaxies
Old Galaxies
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
SF activity of AGN hosts
Control sample of
mass-matched,
non-active galaxies
Star-formation activity (sSFR)
INFRARED AGN:
Star-forming
RADIO AGN:
Quenched
X-RAY AGN:
Straddle the two
Star-Forming
z = 0.2 - 0.8
Quiescent
Infrared AGN
X-ray AGN
Radio AGN
SFRs derived from FIR (Spitzer+Herschel)
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
Cowley et al. in prep
Star-formation Activity in AGN Hosts
All AGN hosts exhibit an elevated level of starformation activity when compared to a control sample
of mass-matched non-active galaxies
-1
log (sSFR/yr
)
Star-formation
activity (sSFR)
−8
AGN Hosts
Control Sample
0.2<z<0.8
0.8<z<1.8
1.8<z<3.2
AGN HOSTS
−9
−10
−11
9.5
SF
R
SF
=
SF
=
NON-ACTIVE
1M
yr
GALAXIES
1M
y r -1
R
R
9.5
10.0
10.5
11.0
log
(M*/M
)
Stellar
Mass
1M
y r -1
-1
10.0
10.5
11.0
log
(M*Mass
/M )
Stellar
=
9.5
10.0
10.5
11.0
log
(M*/M
)
Stellar
Mass
11.5
SFRs derived from FIR (Spitzer+Herschel)
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
Cowley et al. in prep
The SFR−M∗ Relation and
Star-Formation Rate
Empirical Star-Formation
Histories from ZFOURGE
Tomczak et al. in prep
ZFOURGE +
Spitzer + Herschel
0
z=
.1
lim
a
S
et
7
00
2
l.
a
Stellar Mass
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
SFRs are roughly
proportional to stellar mass
at low masses, but this
trend flattens at higher
masses at z<1
Tomczak et al. in prep
DEC (degrees)
The Differential Size Growth
of Field and Cluster Galaxies
at z = 2.1 in ZFOURGE
Allen et al. in press
Projected
density map
RA (degrees)
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
Investigate the differences in
star-forming and quiescent
galaxy properties as a
function of environment
SF cluster galaxies
12% larger and 20% redder
than SF field galaxies
Little difference between
quiescent cluster and field
galaxies
Allen et al. in press
Radio SFR / (IR+UV SFR)
Radio galaxies in ZFOURGE/
NMBS: no difference between
radio-AGN and non-radio-AGN
hosts to z=2.25
Rees et al. submitted
Radio AGN
Radio SFG
Redshift
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
Investigate the host galaxy
properties of a highluminosity (L1.4 > 1024 W
Hz-1) sample of radio-loud
AGN to z = 2.25
The stellar populations of
radio-AGN are found to
evolve with redshift in a
manner that is consistent
with the non-AGN masssimilar galaxy population
Rees et al. submitted
ZFOURGE
FourStar Galaxy Evolution Survey
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
ZFOURGE
FourStar Galaxy Evolution Survey
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
ZFOURGE
FourStar Galaxy Evolution Survey
Lots of interesting results, more to come in 2015 !
-
Sizes : quiescent galaxies at z~4 (Straatman, submitted)
Star formation histories since z~3 (Tomczak, in prep)
Radio Galaxies (Rees, submitted)
Multi-wavelength AGN (Cowley, in prep)
Enviro of cluster and field galaxies at z~2 (Allen, in press)
Satellite galaxies at 1<z<3 (Kawinwanichakij, in prep)
Composite SEDs for 1<z<3 (Forrest, in prep)
ZFOURGE survey paper (Straatman, in prep)
AAO Gemini, Magellan, and Keck Science Symposium, 22nd May 2015
zfourge.tamu.edu
Thanks Magellan!
…and other observatories
Hubble
Spitzer
Magellan
VLA
Chandra
ZFOURGE
FourStar Galaxy Evolution Survey
Herschel
zfourge.tamu.edu