Magic of (sub)mm
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Transcript of Magic of (sub)mm
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Magic of (sub)mm
L_FIR = 1.5e12 L_sun
3mJy
Distance independent probe of universe
Biased to > ULIRGs
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Submm surveys: Probing the epoch of “galaxy formation” (z=1.5 – 3.5)
Optical Gal
Submm Gal
Comparable SFR at high z in dusty starbursts (“submm gal”) as optically selected galaxies, forming giant elliptical galaxies?
SMA/Spitzer
SCUBA 20mJy
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COSMOS/MAMBO 250 GHz survey: dusty galaxy formation
MAMBO/30m
117 pixels
250 GHz
10.6”
0.9 mJy rms
20’ x 20’
Goals:
z distribution + contribution SFHU
Environments
AGN fraction
highest z starbursts?
evol radio-FIR
Bertoldi, Carilli, Schinnerer, Voss, Smolcic +
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Latest counts including COSBO – scaled to 350 GHz assuming T_D = 40 K
PL Index=-2.7
7mJy
1e13 L_sun
COSMOS: 14 srcs >423 srcs > 3.5
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COSMOS: Immediate Gratification
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Radio – MAMBO: > 4 = 9/14 (<4”)
Radio – MAMBO: > 3.5 = 2/9
‘Optical’ – Radio – MAMBO: [6-9]/23 (<1”)
MAMBO – Xray: 2/23
Complex morphology: multiple radio = 4/14
Complex MAMBO: 5/14
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Redshift Distribution
Opt photo
Radio photo (det)
Radio photo (limits)
Submm gal
Lensing: 1 or 2
Spurious: 1 or 2
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Difficulties with redshifts: templates and ambiguities
Z_radZ_opt (1,2)
Optical phot z
Radio phot z:
(1+z) \propto T_D
20K
60K
Z_rad, Z_opt(2)Z_opt (1)
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COSBO 7
Z_rad = 3.3
Z_opt = 0.45
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Radio and opt faint submm galaxies (10-20%): highest z (> 3) starbursts (4 secure srcs)?
COSBO 1: brightest mm source
250 GHz = 6.3+/-0.9 mJy
1.4 GHz = 31 +/- 10 uJy
HST I > 27 K_vega > 19.7
Z > 3.3 ?
COSBO 9
250 GHz = 4.9 +/-0.9
1.4 GHz < 36 uJy
HST I > 27 K_vega > 19.7
Z > 3.7 ?
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COSBO
2005/6: 90hr
Spitzer
Spectroscopy
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END
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UV selected galaxies – large range in bolometric luminosity, but little correlation of L_uv and L_bol
Adelberger 2000