Contribution of optical nir selected galaxies to the mir luminosity function at z 2
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Contribution of optical/NIR selected galaxies to the MIR Luminosity Function at z~2. Laurie Riguccini Under the supervision of Marc Sauvage and Emeric Le Floc’h. Image: réservoir de gaz froid dans la constellation de la croix du Sud Crédits : ESA and the SPIRE & PACS consortia. Context.

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Contribution of optical nir selected galaxies to the mir luminosity function at z 2

Contribution of optical/NIR selected galaxies to the MIR Luminosity Function at z~2

Laurie Riguccini

Under the supervision of Marc Sauvage and Emeric Le Floc’h

Image: réservoir de gaz froid dans la constellation de la croix du Sud

Crédits : ESA and the SPIRE & PACS consortia


Context
Context Luminosity Function at z~2

From Rodighiero et al. 2009

- Work on the VVDS-SWIRE and GOODS fields

- Bolometric LF derived from the extrapolated total IR luminosities from the best-fit to the observed SEDs of each source

- Contribution of LIRGS and ULIRGS : sources defined as objects with 11<log(Lir)<12 and log(Lir)>12 respectively

COSMOS TeamMeeting 2010


Optical and nir color color selection
Optical and NIR color-color selection Luminosity Function at z~2

BM/BX criterion (Adelberger et al. 2004)

BzK criterion (Daddi et al. 2004)

COSMOS TeamMeeting 2010


Bzk criterion
BzK criterion Luminosity Function at z~2

Extinction vector

88% of the MIPS sources are selected as BzK (with K<23 in AB magnitude, cf McCracken et al. 2010)

COSMOS TeamMeeting 2010


Bm bx criterion
BM/BX criterion Luminosity Function at z~2

U G R

COSMOS TeamMeeting 2010


Bm bx criterion on the optical catalogue
BM/BX criterion on the optical catalogue Luminosity Function at z~2

Optical catalog of Ilbert et al. 2009

Templates with the effect of extinction (0<ext<0.2)

90% of the sources of the optical catalog with 1.5<z<2.8 are selected as BM/BX.

COSMOS TeamMeeting 2010


R<25.5 Luminosity Function at z~2

Ext = 0.1

Ext = 0.3

Ext = 0.5

50 % of the MIPS sources with 1.5<z<2.8 are missed by the BM/BX criterion


Dust obscured galaxies dey et al 2008

Selection of galaxies at z~2 with F Luminosity Function at z~2 24μm/FR ≥ 982

Dust-Obscured Galaxies (Dey et al. 2008)

COSMOS TeamMeeting 2010


Extinction Luminosity Function at z~2

COSMOS TeamMeeting 2010


Luminosity function at 8 m rest frame
Luminosity Function at 8μm rest-frame Luminosity Function at z~2

Total

BzK

BM/BX

Dey’s selection

Luminosity at 8μm rest-frame obtained from the interpolation between the Chary & Elbaz (2001) librairy and the 24μm data.

Just a reminder: 1012 L8μm ~1013 LIR

COSMOS TeamMeeting 2010


Perspective herschel
Perspective: Herschel Luminosity Function at z~2

  • COSMOS Pacs: 110 and 160 μm

  • The composite nature of ULIRGs with extreme optical/mid-IR colors at z~2-3

COSMOS TeamMeeting 2010


Conclusion
conclusion Luminosity Function at z~2

  • Two criteria based on optic and NIR:

    • BzK : well adapted to sources affected by extinction (selects 88% of our sample)

    • BM/BX : 50% of the 24μm sources are missed, important fraction of the LF missed at the bright end.

  • Criterion based on optic and MIR (R-[24] color) : select highly obscured galaxies.

COSMOS TeamMeeting 2010


COSMOS TeamMeeting 2010 Luminosity Function at z~2


Future work
Future work Luminosity Function at z~2

LBG

BX

From Guo and White 2008.

COSMOS TeamMeeting 2010


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