Characterizing protoclusters and protogroups at \${\textbackslash}mathrm\{z {\textbackslash}sim 2.5\}\$ using Lyman-\${\textbackslash}alpha\$ Tomography. Qezlou, M., Newman, A. B., Rudie, G. C., & Bird, S. arXiv:2112.03930 [astro-ph], December, 2021. arXiv: 2112.03930Paper abstract bibtex Ly-\${\textbackslash}alpha\$ tomography surveys have begun to produce three-dimensional (3D) maps of the intergalactic medium (IGM) opacity at \$z {\textbackslash}sim 2.5\$ with Mpc resolution. These surveys provide an exciting new way to discover and characterize high-redshift overdensities, including the progenitors of today's massive groups and clusters of galaxies, known as protogroups and protoclusters. We use the IllustrisTNG-\$300\$ hydrodynamical simulation to build mock maps that realistically mimic those observed in the Ly-\${\textbackslash}alpha\$ Tomographic IMACS Survey (LATIS). We introduce a novel method for delineating the boundaries of structures detected in 3D Ly-\${\textbackslash}alpha\$ flux maps by applying the watershed algorithm. We provide estimators for the dark matter masses of these structures (at \$z{\textbackslash}sim2.5\$), their descendant halo masses at \$z=0\$, and the corresponding uncertainties. We also investigate the completeness of this method for the detection of protogroups and protoclusters. Compared to earlier work, we apply and characterize our method over a wider mass range that extends to massive protogroups. We also assess the widely used fluctuating Gunn-Peterson approximation (FGPA) applied to dark-matter-only simulations; we conclude while it is adequate for estimating the Ly-\${\textbackslash}alpha\$ absorption signal from moderate-to-massive protoclusters (\${\textbackslash}gtrsim 10{\textasciicircum}\{14.2\} {\textbackslash} h{\textasciicircum}\{-1\} M_\{{\textbackslash}odot\}\$), it artificially merges a minority of lower-mass structures with more massive neighbors. Our methods will be applied to current and future Ly-\${\textbackslash}alpha\$ tomography surveys to create catalogs of overdensities and study environment-dependent galaxy evolution in the Cosmic Noon era.
@article{qezlou_characterizing_2021,
title = {Characterizing protoclusters and protogroups at \${\textbackslash}mathrm\{z {\textbackslash}sim 2.5\}\$ using {Lyman}-\${\textbackslash}alpha\$ {Tomography}},
url = {http://arxiv.org/abs/2112.03930},
abstract = {Ly-\${\textbackslash}alpha\$ tomography surveys have begun to produce three-dimensional (3D) maps of the intergalactic medium (IGM) opacity at \$z {\textbackslash}sim 2.5\$ with Mpc resolution. These surveys provide an exciting new way to discover and characterize high-redshift overdensities, including the progenitors of today's massive groups and clusters of galaxies, known as protogroups and protoclusters. We use the IllustrisTNG-\$300\$ hydrodynamical simulation to build mock maps that realistically mimic those observed in the Ly-\${\textbackslash}alpha\$ Tomographic IMACS Survey (LATIS). We introduce a novel method for delineating the boundaries of structures detected in 3D Ly-\${\textbackslash}alpha\$ flux maps by applying the watershed algorithm. We provide estimators for the dark matter masses of these structures (at \$z{\textbackslash}sim2.5\$), their descendant halo masses at \$z=0\$, and the corresponding uncertainties. We also investigate the completeness of this method for the detection of protogroups and protoclusters. Compared to earlier work, we apply and characterize our method over a wider mass range that extends to massive protogroups. We also assess the widely used fluctuating Gunn-Peterson approximation (FGPA) applied to dark-matter-only simulations; we conclude while it is adequate for estimating the Ly-\${\textbackslash}alpha\$ absorption signal from moderate-to-massive protoclusters (\${\textbackslash}gtrsim 10{\textasciicircum}\{14.2\} {\textbackslash} h{\textasciicircum}\{-1\} M\_\{{\textbackslash}odot\}\$), it artificially merges a minority of lower-mass structures with more massive neighbors. Our methods will be applied to current and future Ly-\${\textbackslash}alpha\$ tomography surveys to create catalogs of overdensities and study environment-dependent galaxy evolution in the Cosmic Noon era.},
urldate = {2021-12-17},
journal = {arXiv:2112.03930 [astro-ph]},
author = {Qezlou, Mahdi and Newman, Andrew B. and Rudie, Gwen C. and Bird, Simeon},
month = dec,
year = {2021},
note = {arXiv: 2112.03930},
keywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},
}
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We use the IllustrisTNG-\\$300\\$ hydrodynamical simulation to build mock maps that realistically mimic those observed in the Ly-\\${\\textbackslash}alpha\\$ Tomographic IMACS Survey (LATIS). We introduce a novel method for delineating the boundaries of structures detected in 3D Ly-\\${\\textbackslash}alpha\\$ flux maps by applying the watershed algorithm. We provide estimators for the dark matter masses of these structures (at \\$z{\\textbackslash}sim2.5\\$), their descendant halo masses at \\$z=0\\$, and the corresponding uncertainties. We also investigate the completeness of this method for the detection of protogroups and protoclusters. Compared to earlier work, we apply and characterize our method over a wider mass range that extends to massive protogroups. 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Our methods will be applied to current and future Ly-\\${\\textbackslash}alpha\\$ tomography surveys to create catalogs of overdensities and study environment-dependent galaxy evolution in the Cosmic Noon era.},\n\turldate = {2021-12-17},\n\tjournal = {arXiv:2112.03930 [astro-ph]},\n\tauthor = {Qezlou, Mahdi and Newman, Andrew B. and Rudie, Gwen C. and Bird, Simeon},\n\tmonth = dec,\n\tyear = {2021},\n\tnote = {arXiv: 2112.03930},\n\tkeywords = {Astrophysics - Astrophysics of Galaxies, Astrophysics - Cosmology and Nongalactic Astrophysics},\n}\n\n","author_short":["Qezlou, M.","Newman, A. B.","Rudie, G. 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