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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 448148.0, MPI für Astronomie / Publikationen_mpia
Wide and deep near-UV (360 nm) galaxy counts and the extragalactic background light with the Large Binocular Camera
Authors:Grazian, A.; Menci, N.; Giallongo, E.; Gallozzi, S.; Fontanot, F.; Fontana, A.; Testa, V.; Ragazzoni, R.; Baruffolo, A.; Beccari, G.; Diolaiti, E.; di Paola, A.; Farinato, J.; Gasparo, F.; Gentile, G.; Green, R.; Hill, J.; Kuhn, O.; Pasian, F.; Pedichini, F.; Radovich, M.; Smareglia, R.; Speziali, R.; Thompson, D.; Wagner, R. M.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:Astronomy and Astrophysics
Journal Abbrev.:A & A
Volume:505
Start Page:1041
End Page:1048
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Context: Deep multicolour surveys are the main tool for exploring the formation and evolution of the very faint galaxies that are beyond the spectroscopic limit of present technology. The photometric properties of these faint galaxies are usually compared with current renditions of semianalytical models to provide constraints on the detailed treatment of the fundamental physical processes involved in galaxy formation and evolution, namely the mass assembly and the star formation. <BR />Aims: Galaxy counts over large sky areas in the 360 nm near-UV band are particularly difficult to obtain given the low efficiency of near-UV instrumentation, even at 8 m class telescopes. Observing in the near-UV bands can provide a first assessment of the distribution of star formation activity in distant (up to z ~ 3) galaxies. A relatively large instrumental field of view helps to minimize the biases caused by cosmic variance. <BR />Methods: We obtained deep images in the 360 nm U band provided by the blue channel of the Large Binocular Camera at the prime focus of the Large Binocular Telescope. Over an area of ≃0.4 sq. deg., we derived the galaxy number counts down to U = 27 in the Vega system (corresponding to U = 27.86 in the AB system) at a completeness level of 30% reaching the faintest current limit for this wavelength and sky area. <BR />Results: The shape of the galaxy number counts in the U band can be described by a double power-law, the bright side being consistent with the shape of shallower surveys of comparable or greater areas. The slope bends over significantly at U > 23.5 ensuring the convergence of the contribution by star-forming galaxies to the extragalactic background light in the near-UV band to a value that is more than 70% of the most recent upper limits derived for this band. We jointly compared our near-UV and K band counts collected from the literature with a few selected hierarchical CDM models, concentrating on specific critical issues in the physical description of the galaxy formation and evolution.
Free Keywords:surveys; techniques: image processing; galaxies: photometry; galaxies: statistics
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2009A%26A...505.1041... [ID No:1]
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