TY - JOUR
T1 - MIGHTEE-Hi: 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 - Lagos, Claudia del P.
AU - Lidman, Christopher
AU - Piña, Pavel E. Mancera
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 - Hulst, Jan M. van der
AU - Wong, O. Ivy
N1 - 12 pages, 5 figures. Accepted for publication in ApJ Letters on 30 July 2022
PY - 2022/8/12
Y1 - 2022/8/12
N2 - We present the first measurements of HI galaxy scaling relations from a blind
survey at z>0.15. We perform spectral stacking of 9023 spectra of
star-forming galaxies undetected in HI at 0.23<z<0.49, extracted from
MIGHTEE-HI Early Science datacubes, acquired with the MeerKAT radio telescope.
We stack galaxies in bins of galaxy properties (M∗, SFR, and sSFR, with
sSFR≡M∗/SFR), obtaining ≳5σ detections in
most cases, the strongest HI-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 (log10(M∗/M⊙)∼9)
experience a strong HI depletion (∼0.5 dex in log10(MHI/M⊙)), while massive galaxies (log10(M∗/M⊙)∼11)
keep their HI mass nearly unchanged. When looking at the star formation
activity, highly star-forming galaxies evolve significantly in MHI
(fHI, where fHI≡M/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 HI depletion during the last ∼4 Gyr, while massive galaxies have
undergone a significant HI 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 HI galaxy scaling relations from a blind
survey at z>0.15. We perform spectral stacking of 9023 spectra of
star-forming galaxies undetected in HI at 0.23<z<0.49, extracted from
MIGHTEE-HI Early Science datacubes, acquired with the MeerKAT radio telescope.
We stack galaxies in bins of galaxy properties (M∗, SFR, and sSFR, with
sSFR≡M∗/SFR), obtaining ≳5σ detections in
most cases, the strongest HI-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 (log10(M∗/M⊙)∼9)
experience a strong HI depletion (∼0.5 dex in log10(MHI/M⊙)), while massive galaxies (log10(M∗/M⊙)∼11)
keep their HI mass nearly unchanged. When looking at the star formation
activity, highly star-forming galaxies evolve significantly in MHI
(fHI, where fHI≡M/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 HI depletion during the last ∼4 Gyr, while massive galaxies have
undergone a significant HI 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.
KW - astro-ph.GA
KW - astro-ph.CO
U2 - 10.3847/2041-8213/ac85ae
DO - 10.3847/2041-8213/ac85ae
M3 - Article
VL - 935
SP - 1
EP - 9
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 1
M1 - L13
ER -