HectoSpec Redshift Survey for SWIRE/FLS MIR Sources

Jiasheng HuangCfA

Christopher WillmerSteward Observatory, UoA

X. Xia(TNU), R. Yan(Toronto), H. Yan(OSU), L. Yan(IPAC)

Hectospec Multi-Fiber Spectrograph on MMT

• 300 Fibers• 1 deg^2 FoV• Moderate-resolution: 6A and 3A• Wavelength coverage : 3500-10000A @ 6A• On 6.5m MMT• Sensitivity: 1.5-2 hour exposure for objects

with R~22.5

Hectospec

Hectospec

Hectospec on MMT

Why do we do redshift survey for IR selected sources?

50% of total energy is at far-IR

1) High z galaxies

2) Cold dusty galaxies

Dole et al. 2005

Wide-Field REDSHIFT Surveys

• 2DFGRS (B<19.45)• SDSS (R<17.77)• No wide-field redshift survey specifically for IR

sources• Are SDSS and 2DFGRS deeper enough for IR

sources?

R-F24 for galaxies in the Lockman Hole region(~10 deg^2)

SDSS

Redshift Survey in the SWIRE and FLS Regions

• Will measure spectra for 20000 IR-selected sources (F24>0.4 mJy) in EN1, EN2, Lockman, FLS, and XMM-LSS( ~ 30 deg^2)

• Will yield 5000 LIRGs • 400 ULIRGs at z<1.• 900 IR-selected QSO at 1<z<3• Spectra for the coming

Herschel sources

Status

• Field Area (d^2) complete #spec EN1 9.2 0 EN2 4.8 0 Lockman 11.1 63% 4000 XMM 9.1 ~20%(VVDS) ?? FLS 4.4 80% 2000

Spectrum: easy one first

Tough one

QSO

BALQSO

Another BALQSO

K+A ？Balmer Absorption lines are common in 24 mu sources