Flat Rotation Curves of $z\sim 1$ Star-Forming Galaxies and Evidence of Disk-Scale Length Evolution

Abstract

We investigate the shape of the Rotation Curves (RCs) of $z\sim 1$ star-forming galaxies and compare them with the local star-forming galaxies. For this purpose, we have used $409$ galaxies from the K-band Multi-Object Spectrograph (KMOS) for Redshift One Spectroscopic Survey (KROSS). This sample covers the redshift range $0.57\le z\le 1.04$, effective radii $0.69\le R_e\left[kpc\right]\le 7.73$, absolute H-band magnitude $-24.46\le M_H\le -18.85$ with median stellar mass $log\left(M_{\ast }\left[M_{\odot }\right]\right)=9.95$ and median total star-formation rate $log\left(SF{R}_{tot}\left[M_{\odot }y{r}^{-1}\right]\right)=1.49$. Using ${}^{3D}$BAROLO (Barolo), we extract $H\alpha$ kinematic maps and corresponding Rotation Curves (RCs). The main advantage of Barolo is that it incorporates the beam smearing in the 3D observational space, which provide us with the intrinsic rotation velocity even in the low spatial resolution data. Using Asymmetric Drift Correction (ADC), we have corrected the RCs for the pressure gradient effect, which seems to be a more dominant effect than beam smearing in high-z galaxies. Nearly all objects ($0.1<v/\sigma <15$) are affected by the pressure gradient, and we noticed that ADC improves the rotation velocity of these systems by $\sim 10-87\%$. Only a combination of the three techniques (3D-kinematic modelling + 3D-Beamsmearing correction + ADC ) yields the intrinsic RC of an individual galaxy. Further, we present the co-added RCs constructed out of 237 high-quality objects to obtain intrinsic RC shapes out to 6.4 $\times$ disk scale length. We do not see any change in the shape of RCs with respect to the local star-forming disk-type galaxies. In contrast, we do find a significant evolution in the stellar-disk length ($R_D$) of the galaxies. Therefore, we conclude stellar disk evolves over cosmic time while total mass distribution stays constant.

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Cited by in corpus (20)

• The ALPINE-ALMA [CII] Survey: Kinematic Diversity & Rotation in Massive Star Forming Galaxies at z~4.4-5.9
• Einstein, Planck and Vera Rubin: relevant encounters between the Cosmological and the Quantum Worlds
• Cold gas disks in main-sequence galaxies at cosmic noon: Low turbulence, flat rotation curves, and disk-halo degeneracy
• Structure and kinematics of a massive galaxy at z ~ 7
• 3D hydrodynamic simulations for the formation of the Local Group satellite planes
• The MUSE Extremely Deep Field: Evidence for SFR-induced cores in dark-matter dominated galaxies at z=1
• KURVS: The outer rotation curve shapes and dark matter fractions of $z\sim 1.5$ star-forming galaxies
• Observational Evidence of Evolving Dark Matter Profiles at $z\le 1$
• The role of gas kinematics in setting metallicity gradients at high redshift
• The ALMA-CRISTAL survey: Resolved kinematic studies of main sequence star-forming galaxies at 4<z<6
• Dark Matter Fraction in z~1 Star-Forming Galaxies
• Tully-Fisher Relation of Late-type Galaxies at $0.6\le z\le 2.5$
• Dark Matter Fraction in Disk-Like Galaxies Over the Past 10 Gyr
• Testing CCC+TL Cosmology with Galaxy Rotation Curves
• Recent Observations of the Rotation of Distant Galaxies and the Implication for Dark Matter
• Assessing the dark matter content of two quasar host galaxies at z~6 through gas kinematics
• Kinematic scaling relations of disc galaxies from ionised gas at $z\sim 1$ and their connection with dark matter haloes
• Is cosmic dynamics self-regulating?
• HARMONI view of the host galaxies of active galactic nuclei around cosmic noon: Resolved stellar morpho-kinematics and the M${}_{BH}$-${\sigma }_{\star }$ relation
• MUSE-DARK-II: 3D morpho-kinematic modelling of lensed galaxies. Tully-Fisher relation of $z\sim 1$ star-forming galaxies