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  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., et al. (2019). Can intrinsic alignments of elongated low-mass galaxies be used to map the cosmic web at high redshift? Monthly Notices of the Royal Astronomical Society, 488, 5580-5593.

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Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0005-D024-7 Versions-Permalink: https://hdl.handle.net/21.11116/0000-0005-D025-6
Genre: Zeitschriftenartikel

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externe Referenz:
https://ui.adsabs.harvard.edu/abs/2019MNRAS.488.5580P (beliebiger Volltext)
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 Urheber:
Pandya, Viraj1, Autor
Primack, Joel1, Autor
Behroozi, Peter1, Autor
Dekel, Avishai1, Autor
Zhang, Haowen1, Autor
Eckholm, Elliot1, Autor
Faber, Sandra M.1, Autor
Ferguson, Henry C.1, Autor
Giavalisco, Mauro1, Autor
Guo, Yicheng1, Autor
Hathi, Nimish1, Autor
Kodra, Dritan1, Autor
Koekemoer, Anton M.1, Autor
Koo, David C.1, Autor
Newman, Jeffrey1, Autor
van der Wel, Arjen1, Autor
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

Inhalt

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Schlagwörter: galaxies: dwarf galaxies: high-redshift galaxies: statistics galaxies: structure dark matter large-scale structure of Universe Astrophysics - Astrophysics of Galaxies
 Zusammenfassung: Hubble Space Telescope observations show that low-mass (M_*=10^9-10^{10} M_{☉ }) 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 light cones and spectroscopically confirmed galaxy pairs from the Cosmic Assembly Near-infared Deep Extragalactic Legacy Survey (CANDELS), 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 light cones predict strong signals in 3D real space, 3D redshift space, and 2D projected redshift space for both types of alignments (assuming prolate galaxy orientations are the same as those of their host prolate haloes), 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.

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 Datum: 2019
 Publikationsstatus: Erschienen
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Titel: Monthly Notices of the Royal Astronomical Society
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 488 Artikelnummer: - Start- / Endseite: 5580 - 5593 Identifikator: -