Spatially resolved spectroscopic analysis of Ly¿ haloes

• Type: Article in International Scientific Journal
• Date: 2024

Authors

Guo, YC (Author) Other; Bacon, R (Author) Other; Wisotzki, L (Author) Other; Garel, T (Author) Other; Blaizot, J (Author) Other; Schaye, J (Author) Other; Matthee, J (Author) Other; Leclercq, F (Author) Other; Boogaard, L (Author) Other; Richard, J (Author) Other; Verhamme, A (Author) Other; J. Brinchmann (Author) FCUP; Michel-Dansac, L (Author) Other; Kusakabe, H (Author) Other

Journal

Title: Astronomy and Astrophysics

Vol. 691

Final page: A66

ISSN: 0004-6361

Publisher: EDP Sciences

Indexing

ISI Web of Knowledge - 2 Citations

Other information

Authenticus ID: P-017-G4E

DOI: 10.1051/0004-6361/202347958

Abstract (EN): The extended Ly alpha 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 alpha 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 alpha emitters (LAEs) at redshifts of 3 < z < 4 in the MUSE Extremely Deep Field. Our analysis reveals that, with respect to the Ly alpha line of the target LAE, the peak of the Ly alpha line at large distances becomes increasingly more blueshifted up to a projected distance of 60 kpc (approximate to 3x virial radius), with a velocity offset of approximate to 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 alpha luminosity of approximate to 10(41.1) erg s(-1). However, due to the absence of systemic redshift data, it remains unclear whether the Ly alpha 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 alpha line.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9