%0 Generic %1 caputi2015spitzer %A Caputi, K. I. %A Ilbert, O. %A Laigle, C. %A McCracken, H. J. %A Fevre, O. Le %A Fynbo, J. %A Milvang-Jensen, B. %A Capak, P. %A Salvato, M. %A Taniguchi, Y. %D 2015 %K galaxies high-z massive %T Spitzer bright, UltraVISTA faint sources in COSMOS: the contribution to the overall population of massive galaxies at z=3-7 %U http://arxiv.org/abs/1505.05721 %X We have analysed a sample of 574 Spitzer 4.5 micron-selected galaxies with 4.5<23 and Ks>24 (AB) over the UltraVISTA ultra-deep COSMOS field. Our aim is to investigate whether these mid-IR bright, near-IR faint sources contribute significantly to the overall population of massive galaxies at redshifts z>=3. By performing a spectral energy distribution (SED) analysis using up to 30 photometric bands, we have determined that the redshift distribution of our sample peaks at redshifts z~2.5-3.0, and ~32% of the galaxies lie at z>=3. We have studied the contribution of these sources to the galaxy stellar mass function (GSMF) at high redshifts. We found that the 4.5<23, Ks>24 galaxies produce a negligible change to the GSMF previously determined for Ks<24 sources at 3=<z<4, but their contribution is more important at 4=<z<5, accounting for >~50% of the galaxies with stellar masses Mst>~6 x 10^10 Msun. We also constrained the GSMF at the highest-mass end (Mst>~2 x 10^11 Msun) at z>=5. From their presence at 5=<z<6, and virtual absence at higher redshifts, we can pinpoint quite precisely the moment of appearance of the first most massive galaxies as taking place in the ~0.2 Gyr of elapsed time between z~6 and z~5. Alternatively, if very massive galaxies existed earlier in cosmic time, they should have been significantly dust-obscured to lie beyond the detection limits of current, large-area, deep near-IR surveys.

@misc{caputi2015spitzer, abstract = {We have analysed a sample of 574 Spitzer 4.5 micron-selected galaxies with [4.5]<23 and Ks>24 (AB) over the UltraVISTA ultra-deep COSMOS field. Our aim is to investigate whether these mid-IR bright, near-IR faint sources contribute significantly to the overall population of massive galaxies at redshifts z>=3. By performing a spectral energy distribution (SED) analysis using up to 30 photometric bands, we have determined that the redshift distribution of our sample peaks at redshifts z~2.5-3.0, and ~32% of the galaxies lie at z>=3. We have studied the contribution of these sources to the galaxy stellar mass function (GSMF) at high redshifts. We found that the [4.5]<23, Ks>24 galaxies produce a negligible change to the GSMF previously determined for Ks<24 sources at 3=<z<4, but their contribution is more important at 4=<z<5, accounting for >~50% of the galaxies with stellar masses Mst>~6 x 10^10 Msun. We also constrained the GSMF at the highest-mass end (Mst>~2 x 10^11 Msun) at z>=5. From their presence at 5=<z<6, and virtual absence at higher redshifts, we can pinpoint quite precisely the moment of appearance of the first most massive galaxies as taking place in the ~0.2 Gyr of elapsed time between z~6 and z~5. Alternatively, if very massive galaxies existed earlier in cosmic time, they should have been significantly dust-obscured to lie beyond the detection limits of current, large-area, deep near-IR surveys.}, added-at = {2015-05-22T09:44:21.000+0200}, author = {Caputi, K. I. and Ilbert, O. and Laigle, C. and McCracken, H. J. and Fevre, O. Le and Fynbo, J. and Milvang-Jensen, B. and Capak, P. and Salvato, M. and Taniguchi, Y.}, biburl = {https://www.bibsonomy.org/bibtex/2442d56ba938d0aff804066fb7062d10b/miki}, description = {[1505.05721] Spitzer bright, UltraVISTA faint sources in COSMOS: the contribution to the overall population of massive galaxies at z=3-7}, interhash = {207ae131ebc5c80a774221d530f6a3d4}, intrahash = {442d56ba938d0aff804066fb7062d10b}, keywords = {galaxies high-z massive}, note = {cite arxiv:1505.05721Comment: 16 pages, 13 figures, 4 tables. Submitted to the ApJ}, timestamp = {2015-05-22T09:44:21.000+0200}, title = {Spitzer bright, UltraVISTA faint sources in COSMOS: the contribution to the overall population of massive galaxies at z=3-7}, url = {http://arxiv.org/abs/1505.05721}, year = 2015 }