Magic of (sub)mm

L_FIR = 1.5e12 L_sun

3mJy

Distance independent probe of universe

Biased to > ULIRGs

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

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 +

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

COSMOS: Immediate Gratification

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

Redshift Distribution

Opt photo

Radio photo (det)

Radio photo (limits)

Submm gal

Lensing: 1 or 2

Spurious: 1 or 2

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)

COSBO 7

Z_rad = 3.3

Z_opt = 0.45

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 ?

COSBO

2005/6: 90hr

Spitzer

Spectroscopy

END

UV selected galaxies – large range in bolometric luminosity, but little correlation of L_uv and L_bol

Adelberger 2000