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Astrophysics > Astrophysics of Galaxies

arXiv:2409.01786 (astro-ph)
[Submitted on 3 Sep 2024]

Title:The stellar population of a $z\sim3.25$ Ly$α$ emitting group associated with a damped Ly$α$ absorber

Authors:Giulia Pruto, Michele Fumagalli, Marc Rafelski, Mitchell Revalski, Matteo Fossati, Ruari Mackenzie, Tom Theuns
View a PDF of the paper titled The stellar population of a $z\sim3.25$ Ly$\alpha$ emitting group associated with a damped Ly$\alpha$ absorber, by Giulia Pruto and 5 other authors
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Abstract:We present near-infrared observations, acquired with the Wide Field Camera 3 (WFC3) on board of the Hubble Space Telescope (HST), of a Ly$\alpha$ double-clumped emitting nebula at $z \approx 3.25$ associated with a damped Ly$\alpha$ absorber (DLA). With the WFC3/F160W data we observe the stellar continuum around $3600$ $\mathring{\rm A}$ in the rest frame for a galaxy embedded in the West clump of the nebula, $G_{\rm W}$, for which we estimate a star formation rate SFR$_{G_{\rm W}} = 5.0 \pm 0.4$ M$_\odot$ yr$^{-1}$ and maximum stellar mass M$_{G_{\rm W}} < 9.9 \pm 0.7 \times 10^9$ M$_\odot$. With the enhanced spatial resolution of HST, we discover the presence of an additional faint source, $G_{\rm E}$, in the center of the East clump, with a star formation rate of SFR$_{G_{\rm E}} = 0.70 \pm 0.20$ M$_\odot$ yr$^{-1}$ and maximum stellar mass M$_{G_{\rm E}} < 1.4 \pm 0.4 \times 10^9$ M$_\odot$. We show that the Ly$\alpha$ emission in the two clumps can be explained by recombination following in-situ photoionization by the two galaxies, assuming escape fractions of ionizing photons of $\lesssim 0.24$ for $G_{\rm W}$ and $\lesssim 0.34$ for $G_{\rm E}$. The fact that $G_{\rm W}$ is offset by $\approx 8$ kpc from the West clump does not fully rule out the presence of additional fainter star-forming sources that would further contribute to the photon budget inside this $\approx 10^{12}$ M$_\odot$ galaxy group that extends over a region encompassing over $30 \times 50$ kpc.
Comments: 9 pages, 7 figures, 1 table. Re-submitted to A&A
Subjects: Astrophysics of Galaxies (astro-ph.GA)
Cite as: arXiv:2409.01786 [astro-ph.GA]
  (or arXiv:2409.01786v1 [astro-ph.GA] for this version)
  https://doi.org/10.48550/arXiv.2409.01786
arXiv-issued DOI via DataCite
Journal reference: A&A 691, A222 (2024)
Related DOI: https://doi.org/10.1051/0004-6361/202450609
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From: Giulia Pruto [view email]
[v1] Tue, 3 Sep 2024 11:03:47 UTC (1,054 KB)
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