%0 Generic %1 lemaux2017vimos %A Lemaux, B. C. %A Fèvre, O. Le %A Cucciati, O. %A Ribeiro, B. %A Tasca, L. A. M. %A Zamorani, G. %A Ilbert, O. %A Thomas, R. %A Bardelli, S. %A Cassata, P. %A Hathi, N. P. %A Pforr, J. %A Smolčić, V. %A Delvecchio, I. %A Novak, M. %A Berta, S. %A McCracken, H. J. %A Koekemoer, A. %A Amorín, R. %A Garilli, B. %A Maccagni, D. %A Schaerer, D. %A Zucca, E. %D 2017 %K high protocluster redshift %T The VIMOS Ultra Deep Survey: Emerging from the Dark, a Massive Proto-Cluster at z~4.57 %U http://arxiv.org/abs/1703.10170 %X Utilizing spectroscopic observations taken for the VIMOS Ultra-Deep Survey (VUDS) we report here on the discovery of Cl J1001+0220, a massive proto-cluster located at $z_spec\sim4.57$ in the COSMOS field. The proto-cluster was initially detected as a $\sim12\sigma$ overdensity of typical star-forming galaxies in the blind spectroscopic survey of the early universe ($2<z<6$) performed by VUDS. It was further mapped using a new technique developed which statistically combines spectroscopic and photometric redshifts, the latter derived from a recent compilation of deep multi-band imaging. Through various methods, the descendant halo mass of Cl J1001+0220 is estimated to be $łog(M_h/M_ødot)_z=0\sim14.5-15$ with a large amount of mass apparently already in place at $z\sim4.57$. Tentative evidence is found for a fractional excess of older and more massive galaxies within the proto-cluster, an observation which suggests the pervasive early onset of vigorous star formation. No evidence is found for the differences in the star formation rates of member and a matched sample of coeval field galaxies either through rest-frame ultraviolet methods or through stacking extremely deep Very Large Array 3 GHz imaging. Additionally, no evidence for pervasive strong active galactic nuclei (AGN) activity is observed. Analysis of Hubble Space Telescope images provides weak evidence for an elevated incidence of galaxy-galaxy interaction within the proto-cluster. The spectral properties of the two samples are compared, with a definite suppression of Ly$\alpha$ seen in the average member galaxy relative to the coeval field ($f_esc,Ly\alpha=1.8^+0.3_-1.7$% and $4.0^+1.0_-0.8$%, respectively). This observation along with other lines of evidence leads us to infer the possible presence of a large, cool diffuse medium within the proto-cluster environment evocative of a nascent intracluster medium.

@misc{lemaux2017vimos, abstract = {Utilizing spectroscopic observations taken for the VIMOS Ultra-Deep Survey (VUDS) we report here on the discovery of Cl J1001+0220, a massive proto-cluster located at $z_{spec}\sim4.57$ in the COSMOS field. The proto-cluster was initially detected as a $\sim12\sigma$ overdensity of typical star-forming galaxies in the blind spectroscopic survey of the early universe ($2<z<6$) performed by VUDS. It was further mapped using a new technique developed which statistically combines spectroscopic and photometric redshifts, the latter derived from a recent compilation of deep multi-band imaging. Through various methods, the descendant halo mass of Cl J1001+0220 is estimated to be $\log(M_{h}/M_{\odot})_{z=0}\sim14.5-15$ with a large amount of mass apparently already in place at $z\sim4.57$. Tentative evidence is found for a fractional excess of older and more massive galaxies within the proto-cluster, an observation which suggests the pervasive early onset of vigorous star formation. No evidence is found for the differences in the star formation rates of member and a matched sample of coeval field galaxies either through rest-frame ultraviolet methods or through stacking extremely deep Very Large Array 3 GHz imaging. Additionally, no evidence for pervasive strong active galactic nuclei (AGN) activity is observed. Analysis of Hubble Space Telescope images provides weak evidence for an elevated incidence of galaxy-galaxy interaction within the proto-cluster. The spectral properties of the two samples are compared, with a definite suppression of Ly$\alpha$ seen in the average member galaxy relative to the coeval field ($f_{esc,Ly\alpha}=1.8^{+0.3}_{-1.7}$% and $4.0^{+1.0}_{-0.8}$%, respectively). This observation along with other lines of evidence leads us to infer the possible presence of a large, cool diffuse medium within the proto-cluster environment evocative of a nascent intracluster medium.}, added-at = {2017-03-31T10:02:34.000+0200}, author = {Lemaux, B. C. and Fèvre, O. Le and Cucciati, O. and Ribeiro, B. and Tasca, L. A. M. and Zamorani, G. and Ilbert, O. and Thomas, R. and Bardelli, S. and Cassata, P. and Hathi, N. P. and Pforr, J. and Smolčić, V. and Delvecchio, I. and Novak, M. and Berta, S. and McCracken, H. J. and Koekemoer, A. and Amorín, R. and Garilli, B. and Maccagni, D. and Schaerer, D. and Zucca, E.}, biburl = {https://www.bibsonomy.org/bibtex/20b51f6fd97782efce57492c345960f87/miki}, description = {[1703.10170] The VIMOS Ultra Deep Survey: Emerging from the Dark, a Massive Proto-Cluster at z~4.57}, interhash = {7995c777069065f49e63f0d160740c18}, intrahash = {0b51f6fd97782efce57492c345960f87}, keywords = {high protocluster redshift}, note = {cite arxiv:1703.10170Comment: 26 pages, 14 figures, 1 table, submitted to A&A}, timestamp = {2017-03-31T10:02:34.000+0200}, title = {The VIMOS Ultra Deep Survey: Emerging from the Dark, a Massive Proto-Cluster at z~4.57}, url = {http://arxiv.org/abs/1703.10170}, year = 2017 }