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Line & Flux Toolkit

Rest↔observed wavelength conversion, an emission-line reference, and flux→AB/UV magnitude conversion — sharing one redshift.

Shared redshift

Drives the wavelength converter, the glossary's observed-wavelength column, and the absolute-magnitude calculation below.

z = 0.00

▸ cosmology (flat ΛCDM, for the absolute-magnitude panel)

H0 (km/s/Mpc)

Ωm

ΩΛ (= 1 − Ωm)

Rest ↔ Observed Wavelength

λ_obs = λ_rest × (1 + z). Edit either field — the other updates using the shared z above. The unit picked here also drives the glossary table below.

Rest wavelength (Å)

Observed wavelength (Å)

Unit

Emission & Absorption Line Glossary

Rest wavelengths in vacuum. Click a row to load its rest wavelength into the converter above. Units follow the converter's unit selector.

Line	λ_rest (Å)	λ_obs (Å)	Mechanism	Typical origin

recombination permitted H/He cascade line forbidden collisionally excited, needs low density intercombination semi-forbidden, spin-forbidden but allowed resonance permitted UV transition to ground state, scatters readily

Flux → Magnitude

Converts a flux density to an AB magnitude. If your flux is f_λ, supply the wavelength so it can be converted to f_ν first.

Flux value

Unit

Optional: convert to absolute UV magnitude (M_UV) at the shared redshift above, using M = m − 5·log10(D_L/10pc) + 2.5·log10(1+z) — the standard flat-f_ν K-correction used in UV luminosity-function work.