| Autor: |
Matthew C. Wilde, Kirill Tchernyshyov, Jessica K. Werk, Todd M. Tripp, Joseph N. Burchett, J. Xavier Prochaska, Nicolas Tejos, Nicolas Lehner, Rongmon Bordoloi, John M. O’Meara, Jason Tumlinson, J. Christopher Howk |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
The Astrophysical Journal, Vol 948, Iss 2, p 114 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
1538-4357 |
| DOI: |
10.3847/1538-4357/acc85b |
| Popis: |
We combine data sets from the CGM ^2 and CASBaH surveys to model a transition point, R _cross , between circumgalactic and intergalactic media (CGM and IGM, respectively). In total, our data consist of 7244 galaxies at z < 0.5 with precisely measured spectroscopic redshifts, all having impact parameters of 0.01–20 comoving Mpc from 28 QSO sightlines with high-resolution UV spectra that cover H i Ly α . Our best-fitting model is a two-component model that combines a 3D absorber–galaxy cross-correlation function with a simple Gaussian profile at inner radii to represent the CGM. By design, this model gives rise to a determination of R _cross as a function of galaxy stellar mass, which can be interpreted as the boundary between the CGM and IGM. For galaxies with 10 ^8 ≤ M _⋆ / M _⊙ ≤ 10 ^10.5 , we find that R _cross ( M _⋆ ) ≈ 2.0 ± 0.6 R _vir . Additionally, we find excellent agreement between R _cross ( M _⋆ ) and the theoretically determined splashback radius for galaxies in this mass range. Overall, our results favor models of galaxy evolution at z < 0.5 that distribute T ≈ 10 ^4 K gas to distances beyond the virial radius. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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