%0 Generic %1 wilde2023casbah %A Wilde, Matthew C. %A Tchernyshyov, Kirill %A Werk, Jessica K. %A Tripp, Todd M. %A Burchett, Joseph N. %A Prochaska, J. Xavier %A Tejos, Nicolas %A Lehner, Nicolas %A Bordoloi, Rongmon %A O'Meara, John M. %A Tumlinson, Jason %A Howk, J. Christopher %D 2023 %K library %T CGM$^2$ $+$ CASBaH: The Mass Dependence of H~I Ly$\alpha$-Galaxy Clustering and the Extent of the CGM %U http://arxiv.org/abs/2301.02718 %X We combine datasets 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$\alpha$. Our best-fitting model is an exclusionary 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 $10^8 M_\star/M_ødot łeq 10^10.5$, we find that $R_cross(M_\star) 2 0.6 R_\rm vir$. Additionally, we find excellent agreement between $R_\rm cross(M_\star)$ 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.

@misc{wilde2023casbah, abstract = {We combine datasets from the CGM$^{2}$ and CASBaH surveys to model a transition point, $R_{\rm cross}$, 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$\alpha$. Our best-fitting model is an exclusionary 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 $R_{\rm cross}$ as a function of galaxy stellar mass, which can be interpreted as the boundary between the CGM and IGM. For galaxies with $10^8 \leq M_{\star}/M_{\odot} \leq 10^{10.5}$, we find that $R_{\rm cross}(M_{\star}) \approx 2 \pm 0.6 R_{\rm vir}$. Additionally, we find excellent agreement between $R_{\rm cross}(M_{\star})$ 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 $T \approx 10^{4}$K gas to distances beyond the virial radius.}, added-at = {2023-01-10T05:55:59.000+0100}, author = {Wilde, Matthew C. and Tchernyshyov, Kirill and Werk, Jessica K. and Tripp, Todd M. and Burchett, Joseph N. and Prochaska, J. Xavier and Tejos, Nicolas and Lehner, Nicolas and Bordoloi, Rongmon and O'Meara, John M. and Tumlinson, Jason and Howk, J. Christopher}, biburl = {https://www.bibsonomy.org/bibtex/2a3d13090fae95f2cebe788687bb9fb2c/gpkulkarni}, description = {CGM$^2$ $ $ CASBaH: The Mass Dependence of H~I Ly$\alpha$-Galaxy Clustering and the Extent of the CGM}, interhash = {3ca449c767d5b15ff6f15eaa62de10fb}, intrahash = {a3d13090fae95f2cebe788687bb9fb2c}, keywords = {library}, note = {cite arxiv:2301.02718Comment: Submitted to ApJ, 17 pages, 8 figures}, timestamp = {2023-01-10T05:55:59.000+0100}, title = {CGM$^2$ $+$ CASBaH: The Mass Dependence of H~I Ly$\alpha$-Galaxy Clustering and the Extent of the CGM}, url = {http://arxiv.org/abs/2301.02718}, year = 2023 }