Spatially resolved spectroscopic analysis of Ly<i>α</i> haloes
The extended Ly α haloes (LAHs) have been found to be prevalent around high-redshift star-forming galaxies. However, the origin of the LAHs is still a subject of debate. The spatially resolved analysis of Ly α profiles provides an important diagnostic. We analyse the average spatial extent and spectral variation of the circumgalactic LAHs by stacking a sample of 155 Ly α emitters (LAEs) at redshifts of 3 < z < 4 in the MUSE Extremely Deep Field. Our analysis reveals that, with respect to the Ly α line of the target LAE, the peak of the Ly α line at large distances becomes increasingly more blueshifted up to a projected distance of 60 kpc (≈3× virial radius), with a velocity offset of ≈250 km/s. This trend is evident in both the mean and median stacks, suggesting that it is a general property of our LAE sample, which typically has a Ly α luminosity of ≈10 41.1 erg s −1 . However, due to the absence of systemic redshift data, it remains unclear whether the Ly α line peak at large projected distances is less redshifted compared to the inner regions or truly blueshifted with respect to the systemic velocity. We explore various scenarios to explain the large-scale kinematics of the Ly α line.
Authors
- J. Brinchmann (ORCID: https://orcid.org/0000-0003-4359-8797)
- Yucheng Guo (ORCID: https://orcid.org/0000-0002-6137-0422)
- Roland Bacon (ORCID: https://orcid.org/0000-0001-6148-0915)
- Jorryt Matthee (ORCID: https://orcid.org/0000-0003-2871-127X)
- Joop Schaye (ORCID: https://orcid.org/0000-0002-0668-5560)
- Jérémy Blaizot (ORCID: https://orcid.org/0000-0003-1609-7911)
- Johan Richard (ORCID: https://orcid.org/0000-0001-5492-1049)
- L. Wisotzki (ORCID: https://orcid.org/0000-0003-2977-423X)
- Anne Verhamme (ORCID: https://orcid.org/0000-0002-2201-1865)
- Leindert Boogaard (ORCID: https://orcid.org/0000-0002-3952-8588)
- Haruka Kusakabe (ORCID: https://orcid.org/0000-0002-3801-434X)
- Floriane Leclercq (ORCID: https://orcid.org/0000-0002-6085-5073)
- Thibault Garel
- L. Michel-Dansac
Institutions
- Université Claude Bernard Lyon 1 (FR)
- École Normale Supérieure de Lyon (FR)
- University of Geneva (CH)
- Leiden University (NL)
- Centre National de la Recherche Scientifique (FR)
- Universidade do Porto (PT)
- Leibniz Institute for Astrophysics Potsdam (DE)
- ETH Zurich (CH)
- Centre de Recherche Astrophysique de Lyon (FR)
- Institute of Astrophysics and Space Sciences (PT)
- Max Planck Institute for Astronomy (DE)
- National Astronomical Observatory of Japan (JP)
- The University of Texas at Austin (US)
Publication Details
- Journal
- Astronomy and Astrophysics
- Published
- 2024-09-19
- DOI
- https://doi.org/10.1051/0004-6361/202347958
- Citations
- 8
- Primary Topic
- Stellar, planetary, and galactic studies
- Type
- article
- Field-Weighted Citation Impact
- 2.65
Funders
- Deutsche Forschungsgemeinschaft
- Agence Nationale de la Recherche
- European Research Council
- Fundação para a Ciência e a Tecnologia