Mightee-hi: Evolution of hi scaling relations of star-forming galaxies at z < 0.5*
| dc.contributor.author | Sinigaglia, Francesco | |
| dc.contributor.author | Rodighiero, Giulia | |
| dc.contributor.author | Vaccari, Mattia | |
| dc.date.accessioned | 2022-09-06T13:43:21Z | |
| dc.date.available | 2022-09-06T13:43:21Z | |
| dc.date.issued | 2022 | |
| dc.description.abstract | We present the first measurements of H I galaxy scaling relations from a blind survey at z > 0.15. We perform spectral stacking of 9023 spectra of star-forming galaxies undetected in H I at 0.23 < z < 0.49, extracted from MIGHTEE-H I Early Science data cubes, acquired with the MeerKAT radio telescope. We stack galaxies in bins of galaxy properties (stellar mass M*, star formation rateSFR, and specific star formation rate sSFR, with sSFR ≡ M*/SFR), obtaining 5σ detections in most cases, the strongest H I-stacking detections to date in this redshift range. With these detections, we are able to measure scaling relations in the probed redshift interval, finding evidence for a moderate evolution from the median redshift of our sample zmed ∼ 0.37 to z ∼ 0. In particular, low-M* galaxies ( ~ * log 9 10( ) M M ) experience a strong H I depletion (∼0.5 dex in log10( ) M M H I ), while massive galaxies ( ~ * log 11 10( ) M M ) keep their H I mass nearly unchanged. When looking at the star formation activity, highly star-forming galaxies evolve significantly in MH I ( fH I, where fH I ≡ MH I/M*) at fixed SFR (sSFR), while at the lowest probed SFR (sSFR) the scaling relations show no evolution. | en_US |
| dc.identifier.citation | Sinigaglia, F. et al. (2022). Mightee-hi: Evolution of hi scaling relations of star-forming galaxies at z < 0.5*. Astrophysical Journal Letters, 935(1), L13. https://doi.org/10.3847/2041-8213/ac85ae | en_US |
| dc.identifier.issn | 2041-8213 | |
| dc.identifier.uri | https://doi.org/10.3847/2041-8213/ac85ae | |
| dc.identifier.uri | http://hdl.handle.net/10566/7819 | |
| dc.language.iso | en | en_US |
| dc.publisher | IOP Publishing | en_US |
| dc.subject | Astronomy | en_US |
| dc.subject | Astrophysics | en_US |
| dc.subject | Galaxy formation | en_US |
| dc.subject | Galaxy evolution | en_US |
| dc.subject | Radio astronomy | en_US |
| dc.title | Mightee-hi: Evolution of hi scaling relations of star-forming galaxies at z < 0.5* | en_US |
| dc.type | Article | en_US |