Can intrinsic alignments of elongated low-mass galaxies be used to map the cosmic web at high redshift?. Pandya, V., Primack, J., Behroozi, P., Dekel, A., Zhang, H., Eckholm, E., Faber, S. M., Ferguson, H. C., Giavalisco, M., Guo, Y., Hathi, N., Kodra, D., Koo, D., Newman, J., & van der Wel, A. arXiv e-prints, 1902:arXiv:1902.09559, February, 2019. ![Can intrinsic alignments of elongated low-mass galaxies be used to map the cosmic web at high redshift? [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper abstract bibtex Hubble Space Telescope observations show that low-mass (\$M_*=10{\textasciicircum}9-10{\textasciicircum}\{10\}M_\{{\textbackslash}odot\}\$) galaxies at high redshift (\$z=1.0-2.5\$) tend to be elongated (prolate) rather than disky (oblate) or spheroidal. This is explained in zoom-in cosmological hydrodynamical simulations by the fact that these galaxies are forming in cosmic web filaments where accretion happens preferentially along the direction of elongation. We ask whether the elongated morphology of these galaxies allows them to be used as effective tracers of cosmic web filaments at high redshift via their intrinsic alignments. Using mock lightcones and spectroscopically-confirmed galaxy pairs from the CANDELS survey, we test two types of alignments: (1) between the galaxy major axis and the direction to nearby galaxies of any mass, and (2) between the major axes of nearby pairs of low-mass, likely prolate, galaxies. The mock lightcones predict strong signals in 3D real space, 3D redshift space, and 2D projected redshift space for both types of alignments, but we do not detect significant alignment signals in CANDELS observations. However, we show that spectroscopic redshifts have been obtained for only a small fraction of highly elongated galaxies, and accounting for spectroscopic incompleteness and redshift errors significantly degrades the 2D mock signal. This may partly explain the alignment discrepancy and highlights one of several avenues for future work.
@article{pandya_can_2019,
title = {Can intrinsic alignments of elongated low-mass galaxies be used to map the cosmic web at high redshift?},
volume = {1902},
url = {http://adsabs.harvard.edu/abs/2019arXiv190209559P},
abstract = {Hubble Space Telescope observations show that low-mass
(\$M\_*=10{\textasciicircum}9-10{\textasciicircum}\{10\}M\_\{{\textbackslash}odot\}\$) galaxies at high redshift (\$z=1.0-2.5\$)
tend to be elongated (prolate) rather than disky (oblate) or spheroidal.
This is explained in zoom-in cosmological hydrodynamical simulations by
the fact that these galaxies are forming in cosmic web filaments where
accretion happens preferentially along the direction of elongation. We
ask whether the elongated morphology of these galaxies allows them to be
used as effective tracers of cosmic web filaments at high redshift via
their intrinsic alignments. Using mock lightcones and
spectroscopically-confirmed galaxy pairs from the CANDELS survey, we
test two types of alignments: (1) between the galaxy major axis and the
direction to nearby galaxies of any mass, and (2) between the major axes
of nearby pairs of low-mass, likely prolate, galaxies. The mock
lightcones predict strong signals in 3D real space, 3D redshift space,
and 2D projected redshift space for both types of alignments, but we do
not detect significant alignment signals in CANDELS observations.
However, we show that spectroscopic redshifts have been obtained for
only a small fraction of highly elongated galaxies, and accounting for
spectroscopic incompleteness and redshift errors significantly degrades
the 2D mock signal. This may partly explain the alignment discrepancy
and highlights one of several avenues for future work.},
urldate = {2019-02-28},
journal = {arXiv e-prints},
author = {Pandya, Viraj and Primack, Joel and Behroozi, Peter and Dekel, Avishai and Zhang, Haowen and Eckholm, Elliot and Faber, Sandra M. and Ferguson, Henry C. and Giavalisco, Mauro and Guo, Yicheng and Hathi, Nimish and Kodra, Dritan and Koo, David and Newman, Jeffrey and van der Wel, Arjen},
month = feb,
year = {2019},
keywords = {Astrophysics - Astrophysics of Galaxies},
pages = {arXiv:1902.09559},
}
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This is explained in zoom-in cosmological hydrodynamical simulations by the fact that these galaxies are forming in cosmic web filaments where accretion happens preferentially along the direction of elongation. We ask whether the elongated morphology of these galaxies allows them to be used as effective tracers of cosmic web filaments at high redshift via their intrinsic alignments. Using mock lightcones and spectroscopically-confirmed galaxy pairs from the CANDELS survey, we test two types of alignments: (1) between the galaxy major axis and the direction to nearby galaxies of any mass, and (2) between the major axes of nearby pairs of low-mass, likely prolate, galaxies. The mock lightcones predict strong signals in 3D real space, 3D redshift space, and 2D projected redshift space for both types of alignments, but we do not detect significant alignment signals in CANDELS observations. However, we show that spectroscopic redshifts have been obtained for only a small fraction of highly elongated galaxies, and accounting for spectroscopic incompleteness and redshift errors significantly degrades the 2D mock signal. This may partly explain the alignment discrepancy and highlights one of several avenues for future work.","urldate":"2019-02-28","journal":"arXiv e-prints","author":[{"propositions":[],"lastnames":["Pandya"],"firstnames":["Viraj"],"suffixes":[]},{"propositions":[],"lastnames":["Primack"],"firstnames":["Joel"],"suffixes":[]},{"propositions":[],"lastnames":["Behroozi"],"firstnames":["Peter"],"suffixes":[]},{"propositions":[],"lastnames":["Dekel"],"firstnames":["Avishai"],"suffixes":[]},{"propositions":[],"lastnames":["Zhang"],"firstnames":["Haowen"],"suffixes":[]},{"propositions":[],"lastnames":["Eckholm"],"firstnames":["Elliot"],"suffixes":[]},{"propositions":[],"lastnames":["Faber"],"firstnames":["Sandra","M."],"suffixes":[]},{"propositions":[],"lastnames":["Ferguson"],"firstnames":["Henry","C."],"suffixes":[]},{"propositions":[],"lastnames":["Giavalisco"],"firstnames":["Mauro"],"suffixes":[]},{"propositions":[],"lastnames":["Guo"],"firstnames":["Yicheng"],"suffixes":[]},{"propositions":[],"lastnames":["Hathi"],"firstnames":["Nimish"],"suffixes":[]},{"propositions":[],"lastnames":["Kodra"],"firstnames":["Dritan"],"suffixes":[]},{"propositions":[],"lastnames":["Koo"],"firstnames":["David"],"suffixes":[]},{"propositions":[],"lastnames":["Newman"],"firstnames":["Jeffrey"],"suffixes":[]},{"propositions":["van","der"],"lastnames":["Wel"],"firstnames":["Arjen"],"suffixes":[]}],"month":"February","year":"2019","keywords":"Astrophysics - Astrophysics of Galaxies","pages":"arXiv:1902.09559","bibtex":"@article{pandya_can_2019,\n\ttitle = {Can intrinsic alignments of elongated low-mass galaxies be used to map the cosmic web at high redshift?},\n\tvolume = {1902},\n\turl = {http://adsabs.harvard.edu/abs/2019arXiv190209559P},\n\tabstract = {Hubble Space Telescope observations show that low-mass \n(\\$M\\_*=10{\\textasciicircum}9-10{\\textasciicircum}\\{10\\}M\\_\\{{\\textbackslash}odot\\}\\$) galaxies at high redshift (\\$z=1.0-2.5\\$)\ntend to be elongated (prolate) rather than disky (oblate) or spheroidal.\nThis is explained in zoom-in cosmological hydrodynamical simulations by\nthe fact that these galaxies are forming in cosmic web filaments where\naccretion happens preferentially along the direction of elongation. We\nask whether the elongated morphology of these galaxies allows them to be\nused as effective tracers of cosmic web filaments at high redshift via\ntheir intrinsic alignments. Using mock lightcones and\nspectroscopically-confirmed galaxy pairs from the CANDELS survey, we\ntest two types of alignments: (1) between the galaxy major axis and the\ndirection to nearby galaxies of any mass, and (2) between the major axes\nof nearby pairs of low-mass, likely prolate, galaxies. The mock\nlightcones predict strong signals in 3D real space, 3D redshift space,\nand 2D projected redshift space for both types of alignments, but we do\nnot detect significant alignment signals in CANDELS observations.\nHowever, we show that spectroscopic redshifts have been obtained for\nonly a small fraction of highly elongated galaxies, and accounting for\nspectroscopic incompleteness and redshift errors significantly degrades\nthe 2D mock signal. 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