MUSEQuBES: Mapping the distribution of neutral hydrogen around low-redshift galaxies
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866909082499153920 |
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| author | Dutta, Sayak Muzahid, Sowgat Schaye, Joop Mishra, Sapna Chen, Hsiao-Wen Johnson, Sean Wisotzki, Lutz Cantalupo, Sebastiano |
| author_facet | Dutta, Sayak Muzahid, Sowgat Schaye, Joop Mishra, Sapna Chen, Hsiao-Wen Johnson, Sean Wisotzki, Lutz Cantalupo, Sebastiano |
| contents | We present a detailed study of cool, neutral gas traced by Lya around 4595 z<0.5 galaxies using stacks of background quasar spectra. The galaxies are selected from our MUSEQuBES low-z survey along with data from the literature. These galaxies, with a median stellar mass of log (M*/Msun)= 10.0, are probed by 184 background quasars giving rise to 5054 quasar-galaxy pairs. The median impact parameter is b = 1.5 pMpc (median b/Rvir=10.4) with 204 (419) quasar-galaxy pairs probing b/Rvir < 1 (2). We find excess absorption out to at least ~ 15 Rvir transverse distance and ~ 600 km/s along the line of sight. We show that the median stacked profile for the full sample, dominated by the pairs with b > Rvir, can be explained by a galaxy-absorber two-point correlation function with r0 = 7.6 pMpc and gamma = -1.57. There are strong indications that the inner regions (< Rvir) of the rest equivalent width profile are better explained by a log-linear (or a Gaussian) relation whereas the outer regions are well described by a power-law, consistent with galaxy-absorber large-scale clustering. Using a sub-sample of 339 galaxies (442 quasar-galaxy pairs, median b/Rvir = 1.6) with star formation rate measurements, we find that the Lya absorption is significantly stronger for star-forming galaxies compared to passive galaxies, but only within the virial radius. The Lya absorption at b ~ Rvir for a redshift-controlled sample peaks at M* ~ 10^9 Msun~ (Mhalo ~ 10^11 Msun). |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2303_16933 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | MUSEQuBES: Mapping the distribution of neutral hydrogen around low-redshift galaxies Dutta, Sayak Muzahid, Sowgat Schaye, Joop Mishra, Sapna Chen, Hsiao-Wen Johnson, Sean Wisotzki, Lutz Cantalupo, Sebastiano Astrophysics of Galaxies We present a detailed study of cool, neutral gas traced by Lya around 4595 z<0.5 galaxies using stacks of background quasar spectra. The galaxies are selected from our MUSEQuBES low-z survey along with data from the literature. These galaxies, with a median stellar mass of log (M*/Msun)= 10.0, are probed by 184 background quasars giving rise to 5054 quasar-galaxy pairs. The median impact parameter is b = 1.5 pMpc (median b/Rvir=10.4) with 204 (419) quasar-galaxy pairs probing b/Rvir < 1 (2). We find excess absorption out to at least ~ 15 Rvir transverse distance and ~ 600 km/s along the line of sight. We show that the median stacked profile for the full sample, dominated by the pairs with b > Rvir, can be explained by a galaxy-absorber two-point correlation function with r0 = 7.6 pMpc and gamma = -1.57. There are strong indications that the inner regions (< Rvir) of the rest equivalent width profile are better explained by a log-linear (or a Gaussian) relation whereas the outer regions are well described by a power-law, consistent with galaxy-absorber large-scale clustering. Using a sub-sample of 339 galaxies (442 quasar-galaxy pairs, median b/Rvir = 1.6) with star formation rate measurements, we find that the Lya absorption is significantly stronger for star-forming galaxies compared to passive galaxies, but only within the virial radius. The Lya absorption at b ~ Rvir for a redshift-controlled sample peaks at M* ~ 10^9 Msun~ (Mhalo ~ 10^11 Msun). |
| title | MUSEQuBES: Mapping the distribution of neutral hydrogen around low-redshift galaxies |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2303.16933 |