The resolved and eco g3 initiative: drivers of h i content and x-ray emission in galaxy groups
| dc.contributor.author | Baker, Andrew J. | |
| dc.contributor.author | Hutchens, Zackary L. | |
| dc.contributor.author | Kannappan, Sheila J. | |
| dc.date.accessioned | 2026-01-21T13:43:14Z | |
| dc.date.available | 2026-01-21T13:43:14Z | |
| dc.date.issued | 2025 | |
| dc.description.abstract | Adding to the RESOLVE and ECO Gas in Galaxy Groups (G3) initiative, we examine possible drivers of group-integrated H i-to-halo mass ratios (MHI,grp/Mhalo) and group X-ray emission, including group halo mass (Mhalo), virialization as probed by crossing time (tcross), presence of active galactic nuclei (AGN), and group-integrated fractional stellar mass growth rate (FSMGRgrp). G3 groups span Mhalo = 1011−1014.5 M⊙ with comprehensive H i gas and AGN information, which we combine with X-ray stacking of ROSAT All-Sky data. We detect hot gas emission exceeding AGN and X-ray binary backgrounds confidently for Mhalo = 1012.6−1014 M⊙ and unambiguously for Mhalo > 1014 M⊙, reflecting an inverse dependence of MHI,grp/Mhalo and hot gas emission on halo mass. At fixed halo mass, MHI,grp/Mhalo transitions to greater spread below tcross ∼ 2 Gyr. Dividing groups across this transition, lower-tcross groups show elevated X-ray emission compared to higher-tcross groups for Mhalo > 1013.3 M⊙, but this trend reverses for Mhalo = 1012.6−1013.3 M⊙. Additionally, AGN-hosting halos below Mhalo ∼ 1012.1 M⊙ exhibit a broad, ∼0.25 dex deep valley in MHI,grp/Mhalo compared to non-AGN-hosting halos with correspondingly reduced FSMGRgrp. When diluted by non-AGN-hosting halos, this valley becomes shallower and narrower, falling roughly between M halo = 10 11.5 M ⊙ and M halo = 10 12.1 M ⊙ in the overall MHI,grp/Mhalo vs. Mhalo relation. We may also detect a second, less easily interpreted valley at Mhalo ∼ 1013 M⊙. Neither valley matches theoretical predictions of a deeper valley located at or above M halo = 10 12.1 M ⊙ . | |
| dc.identifier.citation | Hutchens, Z.L., Kannappan, S.J., Hess, K.M., Baker, A.J., Sun, M., Carr, D.S., Eckert, K.D. and Stark, D.V., 2025. The RESOLVE and ECO G3 Initiative: Drivers of H i Content and X-Ray Emission in Galaxy Groups. The Astrophysical Journal, 985(2), p.228. | |
| dc.identifier.uri | 10.3847/1538-4357/adc395 | |
| dc.identifier.uri | https://hdl.handle.net/10566/21798 | |
| dc.language.iso | en | |
| dc.publisher | Institute of Physics | |
| dc.subject | resolved | |
| dc.subject | initiative | |
| dc.subject | x-ray emission | |
| dc.subject | galaxy groups | |
| dc.subject | G3 groups | |
| dc.title | The resolved and eco g3 initiative: drivers of h i content and x-ray emission in galaxy groups | |
| dc.type | Article |