MUSE–ALMA Haloes – IX. Morphologies and stellar properties of gas-rich galaxies

MUSE–ALMA Haloes – IX. Morphologies and stellar properties of gas-rich galaxies
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MUSE – ALMA Haloes – 九。

DOI:
10.1093/mnras/stad2134
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发表时间:
2023
影响因子:
4.8
通讯作者:
Szakacs, Roland
Szakacs, Roland
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Karki, Arjun;Kulkarni, Varsha P.;Weng, Simon;Péroux, Céline;Augustin, Ramona;Hayes, Matthew;Ayromlou, Mohammadreza;Kacprzak, Glenn G.;Howk, J. Christopher;Szakacs, Roland

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Understanding how galaxies interact with the circumgalactic medium (CGM) requires determining how galaxies’ morphological and stellar properties correlate with their CGM properties. We report an analysis of 66 well-imaged galaxies detected inHubble Space Telescopeand Very Large Telescope MUSE observations and determined to be within ±500 km s−1of the redshifts of strong intervening quasar absorbers at 0.2 ≲z≲ 1.4 with Hicolumn densities. We present the geometrical properties (Sérsic indices, effective radii, axis ratios, and position angles) of these galaxies determined usinggalfit. Using these properties along with star formation rates (SFRs, estimated using the H α or [Oii] luminosity) and stellar masses (M*estimated from spectral energy distribution fits), we examine correlations among various stellar and CGM properties. Our main findings are as follows: (1) SFR correlates well withM*, and most absorption-selected galaxies are consistent with the star formation main sequence of the global population. (2) More massive absorber counterparts are more centrally concentrated and are larger in size. (3) Galaxy sizes and normalized impact parameters correlate negatively withNHI, consistent with higherNHIabsorption arising in smaller galaxies, and closer to galaxy centres. (4) Absorption and emission metallicities correlate withM*and specific SFR, implying metal-poor absorbers arise in galaxies with low past star formation and faster current gas consumption rates. (5) SFR surface densities of absorption-selected galaxies are higher than predicted by the Kennicutt–Schmidt relation for local galaxies, suggesting a higher star formation efficiency in the absorption-selected galaxies.
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