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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 >4 23 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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UV selected galaxies – large range in bolometric luminosity, but little correlation of L _uv and L _bol Adelberger 2000
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