TY - JOUR
T1 - MIGHTEE-H I : the H I size-mass relation over the last billion years
AU - Rajohnson, Sambatriniaina H. A.
AU - Frank, Bradley S.
AU - Ponomareva, Anastasia A.
AU - Maddox, Natasha
AU - Kraan-Korteweg, Renee C.
AU - Jarvis, Matt J.
AU - Adams, Elizabeth A. K.
AU - Oosterloo, Tom
AU - Baes, Maarten
AU - Spekkens, Kristine
AU - Adams, Nathan J.
AU - Glowacki, Marcin
AU - Kurapati, Sushma
AU - Prandoni, Isabella
AU - Heywood, Ian
AU - Collier, Jordan D.
AU - Sekhar, Srikrishna
AU - Taylor, Russ
PY - 2022
Y1 - 2022
N2 - We present the observed III size-mass relation of 204 galaxies from the MIGIITEE Survey Early Science data. The high sensitivity of MeerKAT allows us to detect galaxies spanning more than 4 orders of magnitude in H I mass, ranging from dwarf galaxies to massive spirals, and including all morphological types. This is the first time the relation has been explored on a blind homogeneous data set that extends over a previously unexplored redshift range of 0 < z < 0.084, i.e. a period of around one billion years in cosmic time. The sample follows the same tight logarithmic relation derived from previous work, between the diameter (D-HI) and the mass (M-HI) of Ht discs. We measure a slope of 0.501 +/- 0.008, an intercept of -3.252(-0.074)(+0.073), and an observed scatter of 0.057 dex. For the first time, we quantify the intrinsic scatter of 0.054 +/- 0.003 dex (similar to 10 per cent), which provides a constraint for cosmological simulations of galaxy formation and evolution. We derive the relation as a function of galaxy type and find that their intrinsic scatters and slopes are consistent within the errors. We also calculate the D-HI-M-HI relation for two redshift bins and do not find any evidence for evolution with redshift. These results suggest that over a period of one billion years in look-back time, galaxy discs have not undergone significant evolution in their gas distribution and mean surface mass density, indicating a lack of dependence on both morphological type and redshift.
AB - We present the observed III size-mass relation of 204 galaxies from the MIGIITEE Survey Early Science data. The high sensitivity of MeerKAT allows us to detect galaxies spanning more than 4 orders of magnitude in H I mass, ranging from dwarf galaxies to massive spirals, and including all morphological types. This is the first time the relation has been explored on a blind homogeneous data set that extends over a previously unexplored redshift range of 0 < z < 0.084, i.e. a period of around one billion years in cosmic time. The sample follows the same tight logarithmic relation derived from previous work, between the diameter (D-HI) and the mass (M-HI) of Ht discs. We measure a slope of 0.501 +/- 0.008, an intercept of -3.252(-0.074)(+0.073), and an observed scatter of 0.057 dex. For the first time, we quantify the intrinsic scatter of 0.054 +/- 0.003 dex (similar to 10 per cent), which provides a constraint for cosmological simulations of galaxy formation and evolution. We derive the relation as a function of galaxy type and find that their intrinsic scatters and slopes are consistent within the errors. We also calculate the D-HI-M-HI relation for two redshift bins and do not find any evidence for evolution with redshift. These results suggest that over a period of one billion years in look-back time, galaxy discs have not undergone significant evolution in their gas distribution and mean surface mass density, indicating a lack of dependence on both morphological type and redshift.
UR - https://hdl.handle.net/1959.7/uws:69644
U2 - 10.1093/mnras/stac693
DO - 10.1093/mnras/stac693
M3 - Article
SN - 0035-8711
VL - 512
SP - 2697
EP - 2706
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 2
ER -