On the implausible physical implications of a claimed lensed neutral hydrogen detection at redshift z = 1.3
| dc.contributor.author | Deane, Roger | |
| dc.date.accessioned | 2025-02-21T07:15:10Z | |
| dc.date.available | 2025-02-21T07:15:10Z | |
| dc.date.issued | 2024-09 | |
| dc.description | DATA AVAILABILITY : The data relevant to this letter and CR23 are publicly available in GMRT archive ( https://naps.ncra.tifr.res.in/goa ), under proposal code 34 066 (PI: Blecher). | en_US |
| dc.description.abstract | The Square Kilometre Array mid-frequency array will enable high-redshift detections of neutral hydrogen ( H I ) emission in galaxies, providing important constraints on the evolution of cold gas in galaxies over cosmic time. Strong gravitational lensing will push back the H I emission frontier towards cosmic noon ( z ∼2), as has been done for all prominent spectral lines in the interstellar medium of galaxies. Chakraborty & Roy report a z = 1 . 3 H I emission detection towards the well-modelled, galaxy-scale gravitational lens, SDSS J0826 + 5630. We carry out H I source modelling of the system and find that their claimed H I magnification, μH I = 29 ±6, requires an H I disc radius of 1 . 5 kpc, which implies an implausible mean H I surface mass density in excess of H I > 2000 M pc −2 . This is several orders of magnitude abo v e the highest measured peak values ( H I 10 M pc −2 ), above which H I is converted into molecular hydrogen. Our re-analysis requires this to be the highest H I mass galaxy known ( M H I 10 11 M ), as well as strongly lensed, the latter having a typical probability of the order of 1 in 10 3 –10 4 . We conclude that the claimed detection is spurious. | en_US |
| dc.description.department | Physics | en_US |
| dc.description.librarian | am2024 | en_US |
| dc.description.sdg | None | en_US |
| dc.description.sponsorship | The South African Radio Astronomy Observatory, which is a facility of the National Research Foundation (NRF), an agency of the Department of Science and Innovation (DSI); the South African Research Chairs Initiative of the DSI/NRF; an Australian Research Council Future Fellowship the Australian Government.; the STFC; a UKRI Frontiers Research Grant; Breakthrough Listen is sponsored by the Breakthrough Prize Foundation. | en_US |
| dc.description.uri | https://academic.oup.com/mnras | en_US |
| dc.identifier.citation | Deane, R.P., Blecher, T., Obreschkow, D. et al. 2024, 'On the implausible physical implications of a claimed lensed neutral hydrogen detection at redshift z = 1 . 3', Monthly Notices of the Royal Astronomical Society, vol. 535, pp. L70-L75. https://DOI.org/10.1093/mnrasl/slae090. | en_US |
| dc.identifier.issn | 0035-8711 (print) | |
| dc.identifier.issn | 1365-2966 (online) | |
| dc.identifier.other | 10.1093/mnrasl/slae090 | |
| dc.identifier.uri | http://hdl.handle.net/2263/101107 | |
| dc.language.iso | en | en_US |
| dc.publisher | Oxford University Press | en_US |
| dc.rights | © 2024 The Author(s). This is an Open Access article distributed under the terms of the Creative Commons Attribution License. | en_US |
| dc.subject | Gravitational lensing: strong | en_US |
| dc.subject | Galaxies: evolution | en_US |
| dc.subject | Galaxies: high-redshift | en_US |
| dc.subject | Radio lines: galaxies | en_US |
| dc.title | On the implausible physical implications of a claimed lensed neutral hydrogen detection at redshift z = 1.3 | en_US |
| dc.type | Article | en_US |