Venice 06 Star Formation in the Cosmic Web Hervé Aussel, AIM Dave Sanders, Mara Salvato, Olivier...
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Transcript of Venice 06 Star Formation in the Cosmic Web Hervé Aussel, AIM Dave Sanders, Mara Salvato, Olivier...
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)
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The Cosmic Infrared Background
• COB:– 23nW/m2/sr
• CIB:– 24 nW/m2/sr
• COB/CIB~1• Locally:
– O/I = 0.3
Dole et al. (2006)
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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)
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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 > 2x1010Msol are undergoing a starburst at z~0.7 (Bell et al, 2005)
• Little AGN contribution
Papovich et al. (2004)
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MIPS 24 µm surveys
Le Floc’h et al (2005)
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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
• 10:00:28.6+02:12:21
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
• 10:00:28.6+02:12:21
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
• 10:00:28.6+02:12:21
Venice 06
Zodiacal Background
Reach, private communication
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Asteroids in the Cosmos Field
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2sq degrees
• No cirrus emission• Detection limit to
420µJy (5)
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Main and Deep Area
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Deep area
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MIPS, IRAC and Galex
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Submm sources
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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 0.5 1 1.5 2
67 µJy 10.5 11.0 11.7 12.0
420 µJy 11.2 11.8 12.5 12.8