---
_id: '11528'
abstract:
- lang: eng
text: Ly α emission lines are typically found to be redshifted with respect to the
systemic redshifts of galaxies, likely due to resonant scattering of Ly α photons.
Here, we measure the average velocity offset for a sample of 96 z ≈ 3.3 Ly α emitters
(LAEs) with a median Ly α flux (luminosity) of ≈10−17 erg cm−2 s−1 (≈1042 erg
s−1) and a median star formation rate (SFR) of ≈1.3 M⊙ yr−1 (not corrected for
possible dust extinction), detected by the Multi-Unit Spectroscopic Explorer as
part of our MUSEQuBES circumgalactic medium (CGM) survey. By postulating that
the stacked CGM absorption profiles of these LAEs, probed by eight background
quasars, must be centred on the systemic redshift, we measure an average velocity
offset, Voffset = 171\pm 8 km s−1, between the Ly α emission peak and the systemic
redshift. The observed Voffset is lower by factors of ≈1.4 and ≈2.6 compared to
the velocity offsets measured for narrow-band-selected LAEs and Lyman break galaxies,
respectively, which probe galaxies with higher masses and SFRs. Consistent with
earlier studies based on direct measurements for individual objects, we find that
the Voffset is correlated with the full width at half-maximum of the red peak
of the Ly α line, and anticorrelated with the rest-frame equivalent width. Moreover,
we find that Voffset is correlated with SFR with a sub-linear scaling relation,
Voffset∝SFR0.16±0.03. Adopting the mass scaling for main-sequence galaxies, such
a relation suggests that Voffset scales with the circular velocity of the dark
matter haloes hosting the LAEs.
acknowledgement: 'We thank the anonymous referee for useful suggestions. This study
is based on observations collected at the European Organisation for Astronomical
Research in the Southern Hemisphere under ESO programme(s): 094.A-0131(B), 095.A
0200(A), 096.A0222(A), 097.A-0089(A), and 099.A-0159(A). SM acknowledges support
from the Alexander von Humboldt Foundation, Germany. SM thanks Christian Herenz
for useful discussion. SC gratefully acknowledges support from Swiss National Science
Foundation grant PP00P2 163824. JB acknowledges support by FCT/MCTES through national
funds by grant UID/FIS/04434/2019 and through Investigador FCT Contract No. IF/01654/2014/CP1215/CT0003.
NB and JZ acknowledge support from ANR grant ANR-17-CE31- 0017 (3DGasFlows). AC
and JR acknowledge support from the ERC starting grant 336736-CALENDS. MA acknowledges
support from European Union’s H2020 Marie Skłodowska-Curie Actions grant 721463
to the SUNDIAL ITN, and from the Spanish Ministry of Economy and Competitiveness
(MINECO) under grant number AYA2016-76219-P. MA also acknowledges support from the
Fundacion BBVA under its 2017 programme of assistance to ´scientific research groups,
for the project ‘Using machine-learning techniques to drag galaxies from the noise
in deep imaging’. FL and AV acknowledge support from the ERC starting grant ERC757258-TRIPLE.'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Sowgat
full_name: Muzahid, Sowgat
last_name: Muzahid
- first_name: Joop
full_name: Schaye, Joop
last_name: Schaye
- first_name: Raffaella Anna
full_name: Marino, Raffaella Anna
last_name: Marino
- first_name: Sebastiano
full_name: Cantalupo, Sebastiano
last_name: Cantalupo
- first_name: Jarle
full_name: Brinchmann, Jarle
last_name: Brinchmann
- first_name: Thierry
full_name: Contini, Thierry
last_name: Contini
- first_name: Martin
full_name: Wendt, Martin
last_name: Wendt
- first_name: Lutz
full_name: Wisotzki, Lutz
last_name: Wisotzki
- first_name: Johannes
full_name: Zabl, Johannes
last_name: Zabl
- first_name: Nicolas
full_name: Bouché, Nicolas
last_name: Bouché
- first_name: Mohammad
full_name: Akhlaghi, Mohammad
last_name: Akhlaghi
- first_name: Hsiao-Wen
full_name: Chen, Hsiao-Wen
last_name: Chen
- first_name: Adélaîde
full_name: Claeyssens, Adélaîde
last_name: Claeyssens
- first_name: Sean
full_name: Johnson, Sean
last_name: Johnson
- first_name: Floriane
full_name: Leclercq, Floriane
last_name: Leclercq
- first_name: Michael
full_name: Maseda, Michael
last_name: Maseda
- first_name: Jorryt J
full_name: Matthee, Jorryt J
id: 7439a258-f3c0-11ec-9501-9df22fe06720
last_name: Matthee
orcid: 0000-0003-2871-127X
- first_name: Johan
full_name: Richard, Johan
last_name: Richard
- first_name: Tanya
full_name: Urrutia, Tanya
last_name: Urrutia
- first_name: Anne
full_name: Verhamme, Anne
last_name: Verhamme
citation:
ama: 'Muzahid S, Schaye J, Marino RA, et al. MUSEQuBES: Calibrating the redshifts
of Lyα emitters using stacked circumgalactic medium absorption profiles. Monthly
Notices of the Royal Astronomical Society. 2020;496(2):1013-1022. doi:10.1093/mnras/staa1347'
apa: 'Muzahid, S., Schaye, J., Marino, R. A., Cantalupo, S., Brinchmann, J., Contini,
T., … Verhamme, A. (2020). MUSEQuBES: Calibrating the redshifts of Lyα emitters
using stacked circumgalactic medium absorption profiles. Monthly Notices of
the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1093/mnras/staa1347'
chicago: 'Muzahid, Sowgat, Joop Schaye, Raffaella Anna Marino, Sebastiano Cantalupo,
Jarle Brinchmann, Thierry Contini, Martin Wendt, et al. “MUSEQuBES: Calibrating
the Redshifts of Lyα Emitters Using Stacked Circumgalactic Medium Absorption Profiles.”
Monthly Notices of the Royal Astronomical Society. Oxford University Press,
2020. https://doi.org/10.1093/mnras/staa1347.'
ieee: 'S. Muzahid et al., “MUSEQuBES: Calibrating the redshifts of Lyα emitters
using stacked circumgalactic medium absorption profiles,” Monthly Notices of
the Royal Astronomical Society, vol. 496, no. 2. Oxford University Press,
pp. 1013–1022, 2020.'
ista: 'Muzahid S, Schaye J, Marino RA, Cantalupo S, Brinchmann J, Contini T, Wendt
M, Wisotzki L, Zabl J, Bouché N, Akhlaghi M, Chen H-W, Claeyssens A, Johnson S,
Leclercq F, Maseda M, Matthee JJ, Richard J, Urrutia T, Verhamme A. 2020. MUSEQuBES:
Calibrating the redshifts of Lyα emitters using stacked circumgalactic medium
absorption profiles. Monthly Notices of the Royal Astronomical Society. 496(2),
1013–1022.'
mla: 'Muzahid, Sowgat, et al. “MUSEQuBES: Calibrating the Redshifts of Lyα Emitters
Using Stacked Circumgalactic Medium Absorption Profiles.” Monthly Notices of
the Royal Astronomical Society, vol. 496, no. 2, Oxford University Press,
2020, pp. 1013–22, doi:10.1093/mnras/staa1347.'
short: S. Muzahid, J. Schaye, R.A. Marino, S. Cantalupo, J. Brinchmann, T. Contini,
M. Wendt, L. Wisotzki, J. Zabl, N. Bouché, M. Akhlaghi, H.-W. Chen, A. Claeyssens,
S. Johnson, F. Leclercq, M. Maseda, J.J. Matthee, J. Richard, T. Urrutia, A. Verhamme,
Monthly Notices of the Royal Astronomical Society 496 (2020) 1013–1022.
date_created: 2022-07-07T10:20:11Z
date_published: 2020-08-01T00:00:00Z
date_updated: 2022-08-18T11:00:24Z
day: '01'
doi: 10.1093/mnras/staa1347
extern: '1'
external_id:
arxiv:
- '1910.03593'
intvolume: ' 496'
issue: '2'
keyword:
- Space and Planetary Science
- Astronomy and Astrophysics
- 'galaxies: haloes'
- 'galaxies: high-redshift'
- 'quasars: absorption lines'
language:
- iso: eng
main_file_link:
- open_access: '1'
url: https://arxiv.org/abs/1910.03593
month: '08'
oa: 1
oa_version: Preprint
page: 1013-1022
publication: Monthly Notices of the Royal Astronomical Society
publication_identifier:
eissn:
- 1365-2966
issn:
- 0035-8711
publication_status: published
publisher: Oxford University Press
quality_controlled: '1'
related_material:
link:
- relation: erratum
url: https://doi.org/10.1093/mnras/staa2668
scopus_import: '1'
status: public
title: 'MUSEQuBES: Calibrating the redshifts of Lyα emitters using stacked circumgalactic
medium absorption profiles'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 496
year: '2020'
...