- Pick a relation on the left: one galaxy property against another, such as how many galaxies there are of each mass.
- Each line is one simulation (solid, dashed or dotted depending on how its numbers were obtained); dots are observations. Point at a line to see where it came from. ✓ ~ ✕ say whether two curves can fairly be compared.
- Go back in time with the bar underneath, or the ← → keys. Your run checks your own curve against the rest.
↑↓ to move, Enter to open, Esc to close. Open this with / or Ctrl/⌘ K.
sim-highline Explorer
Galaxy scaling relations from cosmological simulations, at every redshift each suite provides, next to observations. Each curve opens to its evidence: source, extraction method, and the definitions that decide whether two curves can be compared (stellar-mass aperture, halo definition, population, IMF).
Nothing is synthesised. A suite with no data at the chosen redshift disappears instead of being interpolated. The only arithmetic the page does is exact: unit-preserving transforms you ask for (per unit mass, times mass, physical axes), residuals against a reference you pick, and reading a published curve at a chosen x inside its plotted range for the vs-redshift view.
Where the numbers come from. Solid lines are catalogue-derived or tabulated values, dashed lines are published fits, dotted lines are values digitized from published figures (never used to score a comparison). Context only marks curves whose definitions do not allow a fair comparison with the others.
Get data downloads exactly what is on screen (or all epochs) as a tidy CSV or JSON, with definitions and citations; sim_highline.py loads the full dataset into pandas.
Is the data corrected? No. Curves are shown as published; differences in IMF, aperture or cosmology are flagged, not removed. The only conversion on screen is the optional IMF switch under Customise, off by default. What we changed, and what we did not.
How far to trust it. No outside expert has reviewed the records yet. Methods, limits.
Something wrong or confusing? Tell us (a GitHub account is needed), or use Report an issue on any curve for a mistake in that curve.
What exists shows suite by relation by redshift. Empty cells are missing data, not missing physics.
Start here. Three things people do with it:
- The stellar mass function at z≈8 for every suite that has it, with the Get data panel open to export values, definitions and citations.
- Stellar-to-halo mass relation at z=0 as residuals against TNG; the ✓ ~ ✕ marks say whether the two definitions allow the comparison.
- Gas-phase O/H against stellar mass at z≈6 with observations, ready to download or load with
sim_highline.pyin pandas.
sim-highline · Studies · Dials · Data · Methods · Simulations & observations