The Highest-redshift Balmer Breaks as a Test of ΛCDM
Recent studies have reported tension between the presence of luminous, high-redshift galaxies and the halo mass functions predicted by standard cosmology. Here, an improved test is proposed using the presence of high-redshift Balmer breaks to probe the formation of early 104–105 M ⊙ baryonic minihal...
| 主要な著者: | , , , , , |
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| フォーマット: | Journal article |
| 言語: | English |
| 出版事項: |
American Astronomical Society
2024
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| _version_ | 1826313059660988416 |
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| author | Steinhardt, CL Sneppen, A Clausen, T Katz, H Rey, MP Stahlschmidt, J |
| author_facet | Steinhardt, CL Sneppen, A Clausen, T Katz, H Rey, MP Stahlschmidt, J |
| author_sort | Steinhardt, CL |
| collection | OXFORD |
| description | Recent studies have reported tension between the presence of luminous, high-redshift galaxies and the halo mass functions predicted by standard cosmology. Here, an improved test is proposed using the presence of high-redshift Balmer breaks to probe the formation of early 104–105 M ⊙ baryonic minihalos. Unlike previous tests, this does not depend upon the mass-to-light ratio and has only a slight dependence upon the metallicity, stellar initial mass function, and star formation history, which are all weakly constrained at high redshift. We show that the strongest Balmer breaks allowed at z = 9 using the simplest ΛCDM cosmological model would allow a D 4000 as high as 1.26 under idealized circumstances and D 4000 ≤ 1.14 including realistic feedback models. Since current photometric template fitting to JWST sources infers the existence of stronger Balmer breaks out to z ≳ 11, upcoming spectroscopic follow-up will either demonstrate those templates are invalid at high redshift or imply new physics beyond “vanilla” ΛCDM. |
| first_indexed | 2024-09-25T04:06:53Z |
| format | Journal article |
| id | oxford-uuid:542deb08-75a7-431e-bf7c-a576318edca0 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-09-25T04:06:53Z |
| publishDate | 2024 |
| publisher | American Astronomical Society |
| record_format | dspace |
| spelling | oxford-uuid:542deb08-75a7-431e-bf7c-a576318edca02024-05-30T20:05:20ZThe Highest-redshift Balmer Breaks as a Test of ΛCDMJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:542deb08-75a7-431e-bf7c-a576318edca0EnglishJisc Publications RouterAmerican Astronomical Society2024Steinhardt, CLSneppen, AClausen, TKatz, HRey, MPStahlschmidt, JRecent studies have reported tension between the presence of luminous, high-redshift galaxies and the halo mass functions predicted by standard cosmology. Here, an improved test is proposed using the presence of high-redshift Balmer breaks to probe the formation of early 104–105 M ⊙ baryonic minihalos. Unlike previous tests, this does not depend upon the mass-to-light ratio and has only a slight dependence upon the metallicity, stellar initial mass function, and star formation history, which are all weakly constrained at high redshift. We show that the strongest Balmer breaks allowed at z = 9 using the simplest ΛCDM cosmological model would allow a D 4000 as high as 1.26 under idealized circumstances and D 4000 ≤ 1.14 including realistic feedback models. Since current photometric template fitting to JWST sources infers the existence of stronger Balmer breaks out to z ≳ 11, upcoming spectroscopic follow-up will either demonstrate those templates are invalid at high redshift or imply new physics beyond “vanilla” ΛCDM. |
| spellingShingle | Steinhardt, CL Sneppen, A Clausen, T Katz, H Rey, MP Stahlschmidt, J The Highest-redshift Balmer Breaks as a Test of ΛCDM |
| title | The Highest-redshift Balmer Breaks as a Test of ΛCDM |
| title_full | The Highest-redshift Balmer Breaks as a Test of ΛCDM |
| title_fullStr | The Highest-redshift Balmer Breaks as a Test of ΛCDM |
| title_full_unstemmed | The Highest-redshift Balmer Breaks as a Test of ΛCDM |
| title_short | The Highest-redshift Balmer Breaks as a Test of ΛCDM |
| title_sort | highest redshift balmer breaks as a test of λcdm |
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