MUSEQuBES: The Kinematics of O vi-bearing Gas in and around Low-redshift Galaxies
We present a detailed study of the kinematics of O vi -bearing gas around 60 low-mass (median ${\mathrm{log}}_{10}({M}_{\star }/{M}_{\odot })$ = 8.9) galaxies at low redshift (0.1 < z < 0.7) using background quasars (median impact parameter ≈115 kpc) as part of the MUSE Quasar-fields Blind...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4357/adabbd |
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| author | Sayak Dutta Sowgat Muzahid Joop Schaye Sebastiano Cantalupo Hsiao-Wen Chen Sean Johnson |
| author_facet | Sayak Dutta Sowgat Muzahid Joop Schaye Sebastiano Cantalupo Hsiao-Wen Chen Sean Johnson |
| author_sort | Sayak Dutta |
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| description | We present a detailed study of the kinematics of O vi -bearing gas around 60 low-mass (median ${\mathrm{log}}_{10}({M}_{\star }/{M}_{\odot })$ = 8.9) galaxies at low redshift (0.1 < z < 0.7) using background quasars (median impact parameter ≈115 kpc) as part of the MUSE Quasar-fields Blind Emitters Survey (MUSEQuBES). We find that the majority of the O vi absorbers detected within the virial radius have line-of-sight velocities smaller than the escape velocities and are thus consistent with being gravitationally bound, irrespective of the halo mass. However, the fraction of such absorbers declines at larger impact parameters. The Doppler b parameter and the velocity width (Δ v _90 ) of the O vi absorbers exhibit large scatter inside the virial radius of the host galaxies, but the scatter declines sharply at impact parameter D ≳ 2 R _vir . For high-mass galaxies ( ${\mathrm{log}}_{10}({M}_{\star }/{M}_{\odot })$ > 9), O vi absorption displays a larger kinematic spread, quantified by the pixel-velocity two-point correlation function (TPCF). However, the difference becomes marginal when the pixel velocities are scaled by the galaxies’ circular velocities. We do not find any significant difference between the TPCF of isolated and group galaxies when the stellar mass is controlled for. A significant fraction of groups (4/6) with four or more member galaxies do not show any detectable O vi absorption, likely due to the passive nature of the nearest galaxies. |
| format | Article |
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| language | English |
| publishDate | 2025-01-01 |
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| series | The Astrophysical Journal |
| spelling | doaj-art-f8bfd768e0304f2abc00a967dda2d8262025-08-20T02:14:31ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01980226410.3847/1538-4357/adabbdMUSEQuBES: The Kinematics of O vi-bearing Gas in and around Low-redshift GalaxiesSayak Dutta0https://orcid.org/0009-0000-0797-7365Sowgat Muzahid1https://orcid.org/0000-0003-3938-8762Joop Schaye2https://orcid.org/0000-0002-0668-5560Sebastiano Cantalupo3https://orcid.org/0000-0001-5804-1428Hsiao-Wen Chen4https://orcid.org/0000-0001-8813-4182Sean Johnson5https://orcid.org/0000-0001-9487-8583Inter-University Centre for Astronomy & Astrophysics , Post Bag 04, Pune 411007, IndiaInter-University Centre for Astronomy & Astrophysics , Post Bag 04, Pune 411007, IndiaLeiden Observatory, Leiden University , PO Box 9513, NL-2300 RA Leiden, The NetherlandsDepartment of Physics, University of Milan Bicocca , Piazza della Scienza 3, 20126, Milano, ItalyDepartment of Astronomy & Astrophysics, The University of Chicago , 5640 S. Ellis Avenue, Chicago, IL 60637, USADepartment of Astronomy, University of Michigan , 1085 S. University Avenue, Ann Arbor, MI 48109, USAWe present a detailed study of the kinematics of O vi -bearing gas around 60 low-mass (median ${\mathrm{log}}_{10}({M}_{\star }/{M}_{\odot })$ = 8.9) galaxies at low redshift (0.1 < z < 0.7) using background quasars (median impact parameter ≈115 kpc) as part of the MUSE Quasar-fields Blind Emitters Survey (MUSEQuBES). We find that the majority of the O vi absorbers detected within the virial radius have line-of-sight velocities smaller than the escape velocities and are thus consistent with being gravitationally bound, irrespective of the halo mass. However, the fraction of such absorbers declines at larger impact parameters. The Doppler b parameter and the velocity width (Δ v _90 ) of the O vi absorbers exhibit large scatter inside the virial radius of the host galaxies, but the scatter declines sharply at impact parameter D ≳ 2 R _vir . For high-mass galaxies ( ${\mathrm{log}}_{10}({M}_{\star }/{M}_{\odot })$ > 9), O vi absorption displays a larger kinematic spread, quantified by the pixel-velocity two-point correlation function (TPCF). However, the difference becomes marginal when the pixel velocities are scaled by the galaxies’ circular velocities. We do not find any significant difference between the TPCF of isolated and group galaxies when the stellar mass is controlled for. A significant fraction of groups (4/6) with four or more member galaxies do not show any detectable O vi absorption, likely due to the passive nature of the nearest galaxies.https://doi.org/10.3847/1538-4357/adabbdCircumgalactic mediumGalaxy evolution |
| spellingShingle | Sayak Dutta Sowgat Muzahid Joop Schaye Sebastiano Cantalupo Hsiao-Wen Chen Sean Johnson MUSEQuBES: The Kinematics of O vi-bearing Gas in and around Low-redshift Galaxies The Astrophysical Journal Circumgalactic medium Galaxy evolution |
| title | MUSEQuBES: The Kinematics of O vi-bearing Gas in and around Low-redshift Galaxies |
| title_full | MUSEQuBES: The Kinematics of O vi-bearing Gas in and around Low-redshift Galaxies |
| title_fullStr | MUSEQuBES: The Kinematics of O vi-bearing Gas in and around Low-redshift Galaxies |
| title_full_unstemmed | MUSEQuBES: The Kinematics of O vi-bearing Gas in and around Low-redshift Galaxies |
| title_short | MUSEQuBES: The Kinematics of O vi-bearing Gas in and around Low-redshift Galaxies |
| title_sort | musequbes the kinematics of o vi bearing gas in and around low redshift galaxies |
| topic | Circumgalactic medium Galaxy evolution |
| url | https://doi.org/10.3847/1538-4357/adabbd |
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