A census of galaxy constituents in a Coma Progenitor observed at z\textgreater3. Shi, K., Lee, K., Dey, A., Huang, Y., Malavasi, N., Hung, C., Inami, H., Ashby, M., Duncan, K., Xue, R., Reddy, N., Hong, S., Jannuzi, B. T., Cooper, M. C., Gonzalez, A. H., Röttgering, H. J. A., Best, P. N., & Tasse, C. arXiv:1808.07065 [astro-ph], August, 2018. arXiv: 1808.07065
A census of galaxy constituents in a Coma Progenitor observed at z\textgreater3 [link]Paper  abstract   bibtex   
We present a detailed census of galaxies in and around PC217.96+32.3, a spectroscopically confirmed Coma analog at z=3.78. Diverse galaxy types identified in the field include Lya emitters (LAEs), massive star-forming galaxies, and ultra-massive galaxies (log (Mstar/Msun)\textgreater= 11) which may have already halted their star formation. The sky distribution of the star-forming galaxies suggests the presence of a significant overdensity (delta_g=8+/-2), which is spatially offset from the previously confirmed members by 3-4 Mpc to the west. Candidate quiescent and post-starburst galaxies are also found in large excess (a factor of \textasciitilde 8-15 higher surface density than the field) although their redshifts are less certain. We estimate that the total enclosed mass traced by star-forming galaxy candidates is roughly comparable to that of PC217.96+32.3 traced by the LAEs. We speculate that the true extent of PC217.96+32.3 may be larger than previously known, a half of which is missed by our LAE selection. Alternatively, the newly discovered overdensity may belong to another Coma progenitor not associated with PC217.96+32.3. Expectations from theory suggest that both scenarios are equally unlikely (\textless1%), particularly in the cosmic volume probed in our survey. If confirmed as a single structure, its total mass will be well in excess of Coma, making this a singularly large cosmic structure rarely seen even in large cosmological simulations. Finally, we find that the protocluster galaxies follow the same SFR-M_star scaling relation as the field galaxies, suggesting that the environmental effect at z\textasciitilde4 is a subtle one at best for normal star-forming galaxies.
@article{shi_census_2018,
	title = {A census of galaxy constituents in a {Coma} {Progenitor} observed at z{\textgreater}3},
	url = {http://arxiv.org/abs/1808.07065},
	abstract = {We present a detailed census of galaxies in and around PC217.96+32.3, a spectroscopically confirmed Coma analog at z=3.78. Diverse galaxy types identified in the field include Lya emitters (LAEs), massive star-forming galaxies, and ultra-massive galaxies (log (Mstar/Msun){\textgreater}= 11) which may have already halted their star formation. The sky distribution of the star-forming galaxies suggests the presence of a significant overdensity (delta\_g=8+/-2), which is spatially offset from the previously confirmed members by 3-4 Mpc to the west. Candidate quiescent and post-starburst galaxies are also found in large excess (a factor of {\textasciitilde} 8-15 higher surface density than the field) although their redshifts are less certain. We estimate that the total enclosed mass traced by star-forming galaxy candidates is roughly comparable to that of PC217.96+32.3 traced by the LAEs. We speculate that the true extent of PC217.96+32.3 may be larger than previously known, a half of which is missed by our LAE selection. Alternatively, the newly discovered overdensity may belong to another Coma progenitor not associated with PC217.96+32.3. Expectations from theory suggest that both scenarios are equally unlikely ({\textless}1\%), particularly in the cosmic volume probed in our survey. If confirmed as a single structure, its total mass will be well in excess of Coma, making this a singularly large cosmic structure rarely seen even in large cosmological simulations. Finally, we find that the protocluster galaxies follow the same SFR-M\_star scaling relation as the field galaxies, suggesting that the environmental effect at z{\textasciitilde}4 is a subtle one at best for normal star-forming galaxies.},
	urldate = {2018-08-23},
	journal = {arXiv:1808.07065 [astro-ph]},
	author = {Shi, Ke and Lee, Kyoung-Soo and Dey, Arjun and Huang, Yun and Malavasi, Nicola and Hung, Chao-Ling and Inami, Hanae and Ashby, Matthew and Duncan, Kenneth and Xue, Rui and Reddy, Naveen and Hong, Sungryong and Jannuzi, Buell T. and Cooper, Michael C. and Gonzalez, Anthony H. and Röttgering, Huub J. A. and Best, Phillip N. and Tasse, Cyril},
	month = aug,
	year = {2018},
	note = {arXiv: 1808.07065},
	keywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},
}

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