Venice 06 Star Formation in the Cosmic Web Hervé Aussel, AIM Dave Sanders, Mara Salvato, Olivier Ilbert, David Frayer, Jason Surace, Nick Scoville, and the S- Cosmos team

Venice 06 The Cosmic Infrared Background Dole et al. (2006)

Venice 06 The Cosmic Infrared Background COB: –23nW/m 2 /sr CIB: –24 nW/m 2 /sr COB/CIB~1 Locally: –O/I = 0.3 Dole et al. (2006)

Venice 06 The Resolution of the CIB COB/CIB ~1 indicates that –There is a strong evolution of the infrared emission of galaxies –Directly probed by SCUBA (850 µm) –Indirectly probed by ISOCAM (15 µm) MIPS (24 µm)

Venice 06 ISOCAM surveys Resolved the CIB at 15 µm Resolved 70% of the CIB at 140µm –LIRGs ~60 % –ULIRG ~ 25 % Massive disks galaxies between z=0.5 and z=1.2 Liittle AGN contribution (< 20%)

Venice 06 MIPS 24 µm Surveys Strong Evolution also observed at 24µm Strong evolution of LIRGs and ULIRGs Massive galaxies –40 % of the M > 2x10 10 Msol are undergoing a starburst at z~0.7 (Bell et al, 2005) Little AGN contribution Papovich et al. (2004)

Venice 06 MIPS 24 µm surveys Le Floc’h et al (2005)

Venice 06 Open Questions: What drives the SB? Most of the galaxies responsible for the evolution belong to “Structures” –Elbaz & Cesarsky (2003) Bias: is mass a main parameter or are we biased by environment? Major Merger? –Hammer et al. (2005)

Venice 06 Open Questions What about dense environments ? –Infrared MDR in some clusters: A1689: 30 galaxies detected at 15µm (Duc et al., 2002) Verified in some clusters, not in others Age of the structure might be a key parameter (Coia et al., 2005)

Venice 06 S-Cosmos Map the 2 sq degree of the Cosmos field with IRAC and MIPS. MIPS: –goal is to reach 67 µJy (5  ) at 24µm –36 hrs Full area at 420 µJy (5  ) Test field at 67 µJy (5  )

Venice 06 COSMOS Field Low Extinction Low Background –IRAS 100  m: COSMOS: 0.9 MJy/sr Lockman: 0,5 MJy/sr XMM-LSS: 1.3 Mjy/sr: No bright radio/X-ray source 10:00: :12:21

Venice 06 COSMOS Field Low Extinction Low Background –IRAC 8  m: COSMOS: 6.9 MJy/sr Lockman: 5.0 MJy/sr XMM-LSS: 7.1 Mjy/sr: No bright radio/X-ray source 10:00: :12:21

Venice 06 COSMOS Field Low Extinction Low Background –MIPS 24  m: COSMOS: 32.3 MJy/sr Lockman: 18.4 MJy/sr XMM-LSS: 31.1 MJy/sr –At most a loss of 20% in sensitivity w/r to non equatorial fields No bright radio/X-ray source 10:00: :12:21

Venice 06 Zodiacal Background Reach, private communication

Venice 06 Asteroids in the Cosmos Field

Venice 06 2sq degrees No cirrus emission Detection limit to 420µJy (5  )

Venice 06 Main and Deep Area

Venice 06 Deep area

Venice 06 MIPS, IRAC and Galex

Venice 06 Submm sources

Venice 06 Conclusions S-Cosmos MIPS pilot project has demonstrated the Need to probe below 100 µJy –to resolve a significant fraction of the CIB –To probe the LIRG regime out to z~2 Z µJy µJy