contribution of optical/nir selected galaxies to the mir luminosity function at z~2
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
Contribution of optical/NIR selected galaxies to the MIR Luminosity Function at z~2
Laurie RigucciniUnder the supervision of Marc Sauvage and Emeric Le
Floc’h
Image: réservoir de gaz froid dans la constellation de la croix du SudCrédits : ESA and the SPIRE & PACS consortia
ContextFrom 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
8/06/10 2COSMOS TeamMeeting 2010
Optical and NIR color-color selection
BzK criterion (Daddi et al. 2004)BM/BX criterion (Adelberger et al. 2004)
8/06/10 3COSMOS TeamMeeting 2010
BzK criterion
Extinction vector
88% of the MIPS sources are selected as BzK (with K<23 in AB magnitude, cf McCracken et al. 2010)
88% of the MIPS sources are selected as BzK (with K<23 in AB magnitude, cf McCracken et al. 2010)
8/06/10 4COSMOS TeamMeeting 2010
BM/BX criterion
U G R
8/06/10 5COSMOS TeamMeeting 2010
BM/BX criterion on the optical catalogue
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.
90% of the sources of the optical catalog with 1.5<z<2.8 are selected as BM/BX.
8/06/10 6COSMOS TeamMeeting 2010
R<25.5
50 % of the MIPS sources with 1.5<z<2.8 are missed by the BM/BX criterion50 % of the MIPS sources with 1.5<z<2.8 are missed by the BM/BX criterion
Ext = 0.1Ext = 0.3Ext = 0.5
7
Dust-Obscured Galaxies (Dey et al. 2008) • Selection of galaxies at z~2 with F24μm/FR ≥ 982
8/06/10 8COSMOS TeamMeeting 2010
Extinction
8/06/10 9COSMOS TeamMeeting 2010
Luminosity Function at 8μm rest-frame
TotalBzKBM/BXDey’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 LIR8/06/10 10COSMOS TeamMeeting 2010
Perspective: Herschel
• COSMOS Pacs: 110 and 160 μm • The composite nature of ULIRGs with extreme
optical/mid-IR colors at z~2-3 8/06/10 11COSMOS TeamMeeting 2010
conclusion
• 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.
8/06/10 12COSMOS TeamMeeting 2010
8/06/10 13COSMOS TeamMeeting 2010
Future work
From Guo and White 2008.
LBGBX
8/06/10 14COSMOS TeamMeeting 2010