The KMOS galaxy evolution survey (KGES):the angular momentum of star-forming galaxies over the last approximate to 10Gyr

• Published in: Monthly Notices of the Royal Astronomical Society
• Main Authors: Tiley, Alfred L., Gillman, S., Cortese, L., Swinbank, A. M., Dudzeviciute, U., Harrison, C. M., Smail, I., Obreschkow, D., Croom, S. M., Sharples, R. M., Puglisi, A.
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2021
• Subjects: galaxies: evolution; galaxies: general; galaxies: kinematics and dynamics; galaxies: star formation; SPECTROSCOPIC SURVEY KROSS; SDSS-IV MANGA; STELLAR MASS; LEGACY SURVEY; LUMINOSITY FUNCTION; MORPHO-KINEMATICS; FORMATION HISTORY; BULGE FORMATION; REDSHIFT SURVEY; FIELD GALAXIES; Kross; sami
• Online Access: https://curis.ku.dk/portal/da/publications/the-kmos-galaxy-evolution-survey-kges(ace6932b-e850-4bad-afb9-af591bb7d442).html; https://doi.org/10.1093/mnras/stab1692; https://curis.ku.dk/ws/files/299751959/aa41567_21.pdf

We present the KMOS Galaxy Evolution Survey (KGES), a K-band Multi-Object Spectrograph (KMOS) study of the H alpha and [Nii] emission from 288 K-band-selected galaxies at 1.2 less than or similar to z less than or similar to 1.8, with stellar masses in the range -11.5. In this paper, we describe the survey design, present the sample, and discuss the key properties of the KGES galaxies. We combine KGES with appropriately matched samples at lower redshifts from the KMOS Redshift One Spectroscopic Survey (KROSS) and the SAMI Galaxy Survey. Accounting for the effects of sample selection, data quality, and analysis techniques between surveys, we examine the kinematic characteristics and angular momentum content of star-forming galaxies at z approximate to 1.5, approximate to 1, and approximate to 0. We find that stellar mass, rather than redshift, most strongly correlates with the disc fraction amongst star-forming galaxies at z less than or similar to 1.5, observing only a modest increase in the prevalence of discs between z approximate to 1.5 and z approximate to 0.04 at fixed stellar mass. Furthermore, typical star-forming galaxies follow the same median relation between specific angular momentum and stellar mass, regardless of their redshift, with the normalization of the relation depending more strongly on how disc-like a galaxy's kinematics are. This suggests that massive star-forming discs form in a very similar manner across the approximate to 10Gyr encompassed by our study and that the inferred link between the angular momentum of galaxies and their haloes does not change significantly across the stellar mass and redshift ranges probed in this work.