Optical and mid-infrared spectroscopy of MIPS sources in the NDWFS Bootes field Vandana Desai
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Transcript of Optical and mid-infrared spectroscopy of MIPS sources in the NDWFS Bootes field Vandana Desai
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T. Soifer, C. Bian, L. Armus, H. Teplitz (Pasadena)
A. Dey, B. Jannuzi, E. Le Floc’h, K. Brand (Tucson)
D. Weedman, S. Higdon, J. Higdon, J. Houck (Ithaca)
IRS, IRAC, MIPS Instrument Teams
Optical and mid-infrared spectroscopy of MIPS sources in the NDWFS Bootes field
Vandana Desai
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What is the role of infrared sources in galaxy evolution?
Wavelength (microns)
(nW
m-2 s
r-1)
Elbaz et al. 2002
Stars,AGN Dust
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IR galaxies are not significant today, but they were in the past
Papovich et al. 2004
Eu
clid
No
rm #
Co
un
ts
24 micron flux (mJy)
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4 deg
Optical Spectroscopic Survey
Area = 0.33 deg2
Flux limit = 0.3 mJy
Targeting completeness = 60% (548 targets)
Redshift completeness = 70%
NDWFS Bootes
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Space density as a function of LIR and redshift
Also see Le Floch et al. 2005,Perez-Gonzalez et al. 2005;Caputi et al. 2006
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What are the sources without redshifts?
Nu
mb
er
RedshiftLIRGs at
z = 1ULIRGs
at z > 1.5
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Nu
mb
erR
edsh
ift
R-[24] (mag)
Sources without redshfts
Sources with redshfts
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“Extreme” sources
€
R −[24] ≥14
fν (24)
fν (R)≥1000
νfν (24)
νfν (R)≥ 27
R-[24] color distribution for Bootes MIPS sources
R-[24] (Vega mag)
Fra
ctio
n
Most extreme
10%
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...where we find the peak of the 24m counts!
increasingly significant numbers at fainter fluxes... P
apovich et al. 2004≈0.3 mJy
Ext
rem
e F
ract
ion
24 micron flux (mJy)
24 micron flux (mJy)Eu
clid
No
rm #
Co
un
ts
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SEDs of Extreme Sources
Bump sources =
SF-dominated?
Zphot (bumps) =
1 - 2.5
De
y, De
sai et al. in pre
p
Bu
mp
Fra
ctio
n
24 micron flux (mJy)
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IRS results on extreme sources
1. IRS GTO Team: 58 sources with f(24) > 0.8 mJy
z~2; Few PAH-dominated sources
2. Yan et al. GO1: 52 sources with f(24) > 1 mJy AND R(24:8) > 0.5
z~2; 1/3 PAH-dominated sources
The brightest 24 micron sources tend to be AGN-dominated
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What about the PAH-rich sources at z~2?
f(24)=0.5-0.75 mJyULIRGs
Far-IR SED:70,160,350 micron observations pending
How well can we convert 24 micron flux to LIR at z=2?
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Lots more data on this active phase coming down the pipe!
• Lin Yan’s GO2 and GO3 IRS spectra– GO2: Flux-limited > 1 mJy– GO3: z=1 and z=2 faint samples
• Jiasheng Huang’s z=3 sample
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Le Floch et al. 2005
IR galaxies are not significant today, but they were in the past
Redshift
IR
(Lsu
n M
pc-3
)
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Redshift
R-[
24]
(Veg
a m
ag)
Are extreme sources are off the chart?