Redshift drift for tilted observers consists of an FLRW background term plus directional corrections from peculiar expansion, projected shear, and acceleration along the line of sight.
2MTF I. The Tully-Fisher Relation in the 2MASS J, H and K Bands
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abstract
The 2 Micron All-Sky Survey (2MASS) Tully-Fisher Survey (2MTF) aims to measure Tully-Fisher (TF) distances to all bright inclined spirals in the 2MASS Redshift Survey (2MRS). Essential to this project is a universal calibration of the TF relation in the 2MASS J (1.2 um), H (1.6 um) and K (2.2 um) bands. We present the first bias corrected or universal TF template in these bands. We find that the slope of the TF relation becomes steeper as the wavelength increases being close to L \propto v^4 in K-band and L \propto v^3.6 in J and H-bands. We also investigate the dependence on galaxy morphology showing that in all three bands the relation is steeper for later type spirals which also have a dimmer TF zeropoint than earlier type spirals. We correct the final relation to that for Sc galaxies. Finally we study the scatter from the TF relation fitting for a width dependent intrinsic scatter which is not found to vary significantly with wavelength.
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AI trained on LambdaCDM simulations reconstructs the cosmic vorticity field from SDSS galaxies, revealing coherent vortical structures consistent with the standard model and correcting redshift-space distortions.
citing papers explorer
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Expected redshift drift for tilted observers
Redshift drift for tilted observers consists of an FLRW background term plus directional corrections from peculiar expansion, projected shear, and acceleration along the line of sight.
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Closing the Observational Gap in Cosmic Dynamics: AI-Enabled Reconstruction of the Universe's Vorticity and Rotational Flow Morphology
AI trained on LambdaCDM simulations reconstructs the cosmic vorticity field from SDSS galaxies, revealing coherent vortical structures consistent with the standard model and correcting redshift-space distortions.