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http://hdl.handle.net/20.500.12386/30238
Title: | Predictions for Ultra-deep Radio Counts of Star-forming Galaxies | Authors: | Mancuso, Claudia Lapi, Andrea Cai, Zhen-Yi Negrello, Mattia DE ZOTTI, Gianfranco BRESSAN, Alessandro BONATO, MATTEO Perrotta, Francesca Danese, Luigi |
Issue Date: | 2015 | Journal: | THE ASTROPHYSICAL JOURNAL | Number: | 810 | Issue: | 1 | First Page: | 72 | Abstract: | We have worked outty predictions for the radio counts of star-forming galaxies down to nJy levels, along with redshift distributions down to the detection limits of the phase 1 Square Kilometer Array MID telescope (SKA1-MID) and of its precursors. Such predictions were obtained by coupling epoch-dependent star formation rate (SFR) functions with relations between SFR and radio (synchrotron and free-free) emission. The SFR functions were derived taking into account both the dust-obscured and the unobscured star formation, by combining far-infrared, ultraviolet, and Hα luminosity functions up to high redshifts. We have also revisited the South Pole Telescope counts of dusty galaxies at 95 GHz, performing a detailed analysis of the Spectral Energy Distributions. Our results show that the deepest SKA1-MID surveys will detect high-z galaxies with SFRs two orders of magnitude lower compared to Herschel surveys. The highest redshift tails of the distributions at the detection limits of planned SKA1-MID surveys comprise a substantial fraction of strongly lensed galaxies. We predict that a survey down to 0.25 μJy at 1.4 GHz will detect about 1200 strongly lensed galaxies per square degree, at redshifts of up to 10. For about 30% of them the SKA1-MID will detect at least 2 images. The SKA1-MID will thus provide a comprehensive view of the star formation history throughout the re-ionization epoch, unaffected by dust extinction. We have also provided specific predictions for the EMU/ASKAP and MIGHTEE/MeerKAT surveys. | Acknowledgments: | We are indebted to R. Aversa for providing her analytic approximations for the redshift-dependent SFR functions and acknowledge constructive comments from the anonymous referee. This research has made use of the NASA/IPAC Extragalactic Database (NED), which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration, and of data products from the Wide-field Infrared Survey Explorer , which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. We acknowledge financial support from ASI/INAF Agreement 2014-024-R.0 for the Planck LFI activity of Phase E2, from PRIN INAF 2012, project “Looking into the dust-obscured phase of galaxy formation through cosmic zoom lenses in the Herschel Astrophysical Large Area Survey” and from PRIN INAF 2014, project “Probing the AGN/galaxy co-evolution through ultra-deep and ultra-high-resolution radio surveys.” Z.Y.C. is supported by China Postdoctoral Science Foundation No. 2014M560515. A. L. thanks SISSA for warm hospitality. | URI: | http://hdl.handle.net/20.500.12386/30238 | URL: | https://iopscience.iop.org/article/10.1088/0004-637X/810/1/72 | ISSN: | 0004-637X | DOI: | 10.1088/0004-637X/810/1/72 | Bibcode ADS: | 2015ApJ...810...72M | Fulltext: | open |
Appears in Collections: | 1.01 Articoli in rivista |
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File | Description | Size | Format | |
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Mancuso_2015_ApJ_810_72.pdf | Pdf editoriale | 2.59 MB | Adobe PDF | View/Open |
Mancuso_arxiv.pdf | postprint | 1.41 MB | Adobe PDF | View/Open |
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