June 17, 2024 | TOBIAS MISTELE, STACY MCGAUGH, FEDERICO LELLI, JAMES SCHOMBERT, PENGFEI LI
This study uses a new deprojection formula to infer gravitational potentials around isolated galaxies from weak gravitational lensing data. The results show that circular velocity curves remain flat for hundreds of kiloparsecs, extending the classic result from 21 cm observations. There is no clear decline in velocity out to 1 Mpc, well beyond the expected virial radii of dark matter halos. Binning the data by mass reveals a correlation with the flat circular speed that closely agrees with the Baryonic Tully-Fisher Relation (BTFR) known from kinematic data. These results apply to both early and late-type galaxies, indicating a common universal behavior.
The study analyzes a sample of isolated galaxies from the KiDS survey using a new robust deprojection method. The results show that circular velocities remain flat out to ~1 Mpc, with no clear indication of a decline. This behavior persists in every mass bin for both early-type (ETGs) and late-type (LTGs) galaxies. The results are consistent with the BTFR, which links baryonic mass to the mean rotation speed along the flat part of the rotation curve. The BTFR is found to hold for both ETGs and LTGs, suggesting a universal behavior.
The study also compares the results with ΛCDM expectations and finds that the observed circular velocity curves do not match the expected decline from dark matter halos. The results are consistent with the BTFR and suggest that the asymptotic flatness of rotation curves and the BTFR are independent of galaxy morphology and evolutionary history. The results support the idea that galaxies lie on the BTFR due to the availability of an adequate tracer to measure Vc out to large radii.
The study concludes that the circular velocity curves from weak lensing observations remain flat for hundreds of kpc, possibly up to 1 Mpc, and imply a weak-lensing BTFR that is fully consistent with the kinematic BTFR. These results hold for both LTGs and ETGs separately, suggesting a common universal behavior. The results are consistent with the BTFR and suggest that the asymptotic flatness of rotation curves and the BTFR are independent of galaxy morphology and evolutionary history.This study uses a new deprojection formula to infer gravitational potentials around isolated galaxies from weak gravitational lensing data. The results show that circular velocity curves remain flat for hundreds of kiloparsecs, extending the classic result from 21 cm observations. There is no clear decline in velocity out to 1 Mpc, well beyond the expected virial radii of dark matter halos. Binning the data by mass reveals a correlation with the flat circular speed that closely agrees with the Baryonic Tully-Fisher Relation (BTFR) known from kinematic data. These results apply to both early and late-type galaxies, indicating a common universal behavior.
The study analyzes a sample of isolated galaxies from the KiDS survey using a new robust deprojection method. The results show that circular velocities remain flat out to ~1 Mpc, with no clear indication of a decline. This behavior persists in every mass bin for both early-type (ETGs) and late-type (LTGs) galaxies. The results are consistent with the BTFR, which links baryonic mass to the mean rotation speed along the flat part of the rotation curve. The BTFR is found to hold for both ETGs and LTGs, suggesting a universal behavior.
The study also compares the results with ΛCDM expectations and finds that the observed circular velocity curves do not match the expected decline from dark matter halos. The results are consistent with the BTFR and suggest that the asymptotic flatness of rotation curves and the BTFR are independent of galaxy morphology and evolutionary history. The results support the idea that galaxies lie on the BTFR due to the availability of an adequate tracer to measure Vc out to large radii.
The study concludes that the circular velocity curves from weak lensing observations remain flat for hundreds of kpc, possibly up to 1 Mpc, and imply a weak-lensing BTFR that is fully consistent with the kinematic BTFR. These results hold for both LTGs and ETGs separately, suggesting a common universal behavior. The results are consistent with the BTFR and suggest that the asymptotic flatness of rotation curves and the BTFR are independent of galaxy morphology and evolutionary history.