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http://hdl.handle.net/20.500.12386/25045
Titolo: | Are the Bulk of z > 2 Herschel Galaxies Proto-Spheroids? | Autori: | Pozzi, F. CALURA, Francesco GRUPPIONI, Carlotta GRANATO, Gian Luigi CRESCI, GIOVANNI SILVA, Laura POZZETTI, Lucia Matteucci, F. Zamorani, G. |
Data pubblicazione: | 2015 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 803 | Fascicolo: | 1 | Da pagina:: | 35 | Abstract: | We present a backward approach for the interpretation of the evolution of the near-IR and the far-IR luminosity functions (LFs) across the redshift range 0\lt z\lt 3. In our method, late-type galaxies are treated by means of a parametric phenomenological method based on PEP/HerMES data up to z ∼ 4, whereas spheroids are described by means of a physically motivated backward model. The spectral evolution of spheroids is modeled by means of a single-mass model, associated with a present-day elliptical with a K-band luminosity comparable to the break of the local early-type LF. The formation of proto-spheroids is assumed to occurr across the redshift range 1≤slant z≤slant 5. The key parameter is represented by the redshift {{z}<SUB>0.5</SUB>} at which half of all proto-spheroids are already formed. For this parameter, a statistical study indicates values between {{z}<SUB>0.5</SUB>}=1.5 and {{z}<SUB>0.5</SUB>}=3. We assume {{z}<SUB>0.5</SUB>}∼ 2 as the fiducial value and show that this assumption allows us to describe accourately the redshift distributions and the source counts. By assuming {{z}<SUB>0.5</SUB>}∼ 2 at the far-IR flux limit of the PEP-COSMOS survey, the PEP-selected sources observed at z\gt 2 can be explained as progenitors of local spheroids caught during their formation. We also test the effects of mass downsizing by dividing the spheroids into three populations of different present-day stellar masses. The results obtained in this case confirm the validity of our approach, i.e., that the bulk of proto-spheroids can be modeled by means of a single model that describes the evolution of galaxies at the break of the present-day early-type K-band LF. | Acknowledgments: | F. P. thanks M. Cirasuolo for information about the UKIDSS survey, P. Santini for sending us her compilation of mass density, M. Moresco for sending us his spheroid formation epochs, and I. Davidzon for helpful discussion. We are grateful to an anonymous referee for valuable suggestions that improved the paper. F.P. and C.G. acknowledge partial support from the Italian Space Agency (contract ASI I/005/11/0). F.C. and F.M. acknowledge financial support from PRIN MIUR 2010–2011, project “The Chemical and Dynamical Evolution of the Milky Way and Local Group Galaxies,” prot. 2010LY5N2T. (France); MPIA (Germany); INAF—IFSI/OAA/OAP/OAT, LENS, SISSA (Italy); IAC (Spain). This development has been supported by the funding agencies BMVIT (Austria), ESA-PRODEX), CEA/CNES (France), DLR (Germany), ASI/INAF (Italy), and CICYT/MCYT (Spain). | URI: | http://hdl.handle.net/20.500.12386/25045 | URL: | https://iopscience.iop.org/article/10.1088/0004-637X/803/1/35 | ISSN: | 0004-637X | DOI: | 10.1088/0004-637X/803/1/35 | Bibcode ADS: | 2015ApJ...803...35P | Fulltext: | open |
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