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Deep Spitzer 24mic COSMOS imaging -- I. The evolution of luminous dusty galaxies - Confronting the models by Floc'h, E. Le; Aussel, H.; Ilbert, O.; Riguccini, L.; Frayer, D.; Salvato, M.; Surace, J.; Arnouts, S.; Feruglio, C.; Rodighiero, G.; Capak, P.; Kartaltepe, J.; Heinis, S.; Sheth, K.; Yan, L.; McCracken, H.; Thompson, D.; Sanders, D.; Scoville, N.; Koekemoer, A. is a scholarly article available to read on EtoBox.

What is Deep Spitzer 24mic COSMOS imaging -- I. The evolution of luminous dusty galaxies - Confronting the models about?

We present the first results obtained from the identification of ~30,000 sources in the 24mic observations of the COSMOS field at S24>~80muJy. Using accurate photo-z's and extrapolations of the counts at faint fluxes we resolve with unprecedented detail the build-up of the mid-IR background across cosmic ages. We find that ~50% and ~80% of the 24mic background intensity originate from galaxies at z<~1 and z<~2 respectively, supporting the scenario where highly obscured sources at very high redshifts (z>~2) contribute only marginally to the CIB. Assuming flux-limited selections at optical wavelengths, we also find that the fraction of i-band sources with 24mic detection strongly increases up to z~2 as a consequence of the rapid evolution that star-forming galaxies have undergone with lookback time. Nonetheless this rising trend shows a clear break at z~1.3, probably due to k-correction effects implied by the complexity of SEDs in the mid-IR. Finally, we compare our results with the predictions from different models of galaxy formation. We note that semi-analytical formalisms fail to reproduce the redshift distributions observed at 24mic. Furthermore the simulated galaxies exhibit R-

Author

Floc'h, E. Le; Aussel, H.; Ilbert, O.; Riguccini, L.; Frayer, D.; Salvato, M.; Surace, J.; Arnouts, S.; Feruglio, C.; Rodighiero, G.; Capak, P.; Kartaltepe, J.; Heinis, S.; Sheth, K.; Yan, L.; McCracken, H.; Thompson, D.; Sanders, D.; Scoville, N.; Koekemoer, A.

Published

2009

Language

EN