TY - JOUR
T1 - MIGHTEE-Hi
T2 - Evolution of Hi Scaling Relations of Star-forming Galaxies at z < 0.5*
AU - Sinigaglia, Francesco
AU - Rodighiero, Giulia
AU - Elson, Ed
AU - Vaccari, Mattia
AU - Maddox, Natasha
AU - Frank, Bradley S.
AU - Jarvis, Matt J.
AU - Oosterloo, Tom
AU - Davé, Romeel
AU - Salvato, Mara
AU - Baes, Maarten
AU - Bellstedt, Sabine
AU - Bisigello, Laura
AU - Collier, Jordan D.
AU - Cook, Robin H.W.
AU - Davies, Luke J.M.
AU - Delhaize, Jacinta
AU - Driver, Simon P.
AU - Foster, Caroline
AU - Kurapati, Sushma
AU - Claudia, Claudia del
AU - Lidman, Christopher
AU - Mancera Piña, Pavel E.
AU - Meyer, Martin J.
AU - Mogotsi, K. Moses
AU - Pan, Hengxing
AU - Ponomareva, Anastasia A.
AU - Prandoni, Isabella
AU - Rajohnson, Sambatriniaina H.A.
AU - Robotham, Aaron S.G.
AU - Santos, Mario G.
AU - Sekhar, Srikrishna
AU - Spekkens, Kristine
AU - Thorne, Jessica E.
AU - van der Hulst, Jan M.
AU - Wong, O. Ivy
N1 - Funding Information:
The authors warmly thank the anonymous referee for the constructive review and helpful comments they offered. The authors also thank Alvio Renzini for insightful comments and discussions. F.S. acknowledges the support of the doctoral grant funded by the University of Padova and by the Italian Ministry of Education, University and Research (MIUR). G.R. acknowledges the support from grant PRIN MIUR 2017-20173ML3WW_001. M.V. acknowledges financial support from the South African Department of Science and Innovation’s National Research Foundation under the ISARP RADIOSKY2020 Joint Research Scheme (DSI-NRF grant No. 113121) and the CSUR HIPPO Project (DSI-NRF grant No. 121291). N.M. acknowledges support of the LMU Faculty of Physics. H.P. acknowledges support from the South African Radio Astronomy Observatory (SARAO). S.H.A.R. is supported by the South African Research Chairs Initiative of the Department of Science and Technology and National Research Foundation. C.F. is the recipient of an Australian Research Council Future Fellowship (project number FT210100168) funded by the Australian Government. A.A.P. acknowledges support of the STFC consolidated grant ST/S000488/1 and from the Oxford Hintze Centre for Astrophysical Surveys, which is funded through generous support from the Hintze Family Charitable Foundation. I.P. acknowledges financial support from the Italian Ministry of Foreign Affairs and International Cooperation (MAECI grant No. ZA18GR02) and the South African Department of Science and Technology’s National Research Foundation (DST-NRF grant No. 113121) as part of the ISARP RADIOSKY2020 Joint Research Scheme. J.M.v.d.H. acknowledges support from the European Research Council under the European Unions Seventh Framework Programme (FP/2007-2013) / ERC grant Agreement nr. 291531 (HIStoryNU). The MeerKAT telescope is operated by the South African Radio Astronomy Observatory, which is a facility of the National Research Foundation, an agency of the Department of Science and Innovation. We acknowledge the use of the ilifu cloud computing facility—www.ilifu.ac.za, a partnership between the University of Cape Town, the University of the Western Cape, the University of Stellenbosch, Sol Plaatje University, the Cape Peninsula University of Technology, and the South African Radio Astronomy Observatory. The Ilifu facility is supported by contributions from the Inter-University Institute for Data Intensive Astronomy (IDIA a partnership between the University of Cape Town, the University of Pretoria, the University of the Western Cape and the South African Radio Astronomy Observatory), the Computational Biology division at UCT and the Data Intensive Research Initiative of South Africa (DIRISA).
Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
PY - 2022/8/10
Y1 - 2022/8/10
N2 - 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 z med ∼ 0.37 to z ∼ 0. In particular, low-M * galaxies ( log 10 ( M * / M ⊙ ) ∼ 9 ) experience a strong H i depletion (∼0.5 dex in log 10 ( M H I / M ⊙ ) ), while massive galaxies ( log 10 ( M * / M ⊙ ) ∼ 11 ) keep their H i mass nearly unchanged. When looking at the star formation activity, highly star-forming galaxies evolve significantly in M H I (f H I, where f H I ≡ M H I/M *) at fixed SFR (sSFR), while at the lowest probed SFR (sSFR) the scaling relations show no evolution. These findings suggest a scenario in which low-M * galaxies have experienced a strong H i depletion during the last ∼5 Gyr, while massive galaxies have undergone a significant H i replenishment through some accretion mechanism, possibly minor mergers. Interestingly, our results are in good agreement with the predictions of the simba simulation. We conclude that this work sets novel important observational constraints on galaxy scaling relations.
AB - 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 z med ∼ 0.37 to z ∼ 0. In particular, low-M * galaxies ( log 10 ( M * / M ⊙ ) ∼ 9 ) experience a strong H i depletion (∼0.5 dex in log 10 ( M H I / M ⊙ ) ), while massive galaxies ( log 10 ( M * / M ⊙ ) ∼ 11 ) keep their H i mass nearly unchanged. When looking at the star formation activity, highly star-forming galaxies evolve significantly in M H I (f H I, where f H I ≡ M H I/M *) at fixed SFR (sSFR), while at the lowest probed SFR (sSFR) the scaling relations show no evolution. These findings suggest a scenario in which low-M * galaxies have experienced a strong H i depletion during the last ∼5 Gyr, while massive galaxies have undergone a significant H i replenishment through some accretion mechanism, possibly minor mergers. Interestingly, our results are in good agreement with the predictions of the simba simulation. We conclude that this work sets novel important observational constraints on galaxy scaling relations.
UR - http://www.scopus.com/inward/record.url?scp=85136280985&partnerID=8YFLogxK
U2 - 10.3847/2041-8213/ac85ae
DO - 10.3847/2041-8213/ac85ae
M3 - Article
AN - SCOPUS:85136280985
SN - 2041-8205
VL - 935
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L13
ER -