MEASUREMENTS AT SURVEY SCALE
A larger catalog is the beginning.
The right observables make it useful.
Explore measured redshifts and independent distance indicators. This is a coverage and data-readiness inventory, not a fitted Great Attractor velocity field.
These are measured catalog entries, not synthetic galaxies. DESI counts and CF4 records are not added together: cross-catalog identities and shared calibration have not been reconciled. We have not downloaded 14 million individual DESI spectra.
THE OBSERVATIONAL FOOTPRINT
Loading the pinned catalog products…
Reference direction: Galactic l = 325°, b = −7°. This exploratory cone is not an inferred attractor boundary.
How to read this map: Every coloured square counts catalog entries in a 5° × 5° patch of sky. Colour shows more or fewer selected measurements; white shows no selected entries. These are survey records on a grid, not resolved pictures of galaxies. See the actual Hubble, Webb, ESO and Chandra images ↗
Counts, not corrected density. Five-degree longitude/latitude cells have unequal sky area. Survey selection, dust and observing strategy affect the pattern. The dashed band marks |b| = 10° for orientation; it is not a survey completeness mask. Empty cells do not establish a cosmic void.
INDIVIDUAL MEASUREMENTS
D = 10(μ−25)/5 Mpc. The interval uses μ ± σμ and is asymmetric in distance. VCMB is the catalog's systemic velocity in the CMB frame; it is not a peculiar velocity. Method flags identify available indicators; the displayed μ combines methodologies on the published common scale.
| PGC | RA / Dec ° | VCMB km/s | μ ± σμ mag | D [μ ± σμ] Mpc | Methods present |
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FROM CATALOG SIZE TO A TEST
DESI supplies spectroscopic redshifts, classifications and quality flags. This selection uses primary spectra, GALAXY classification, ZWARN = 0, 0 < z < 2 and valid Galactic coordinates across surveys/programs. It is an inventory cut, not the DESI cosmology sample or a complete census.
Cosmicflows-4 supplies distance moduli, uncertainties and indicators including Tully–Fisher, Fundamental Plane and supernovae. Inferring peculiar velocities requires a consistent redshift frame, a background model, correlated calibration and a selection-aware likelihood.
Only 126 CF4 entries lie inside the example 20° Norma cone at transformed distances of 40–100 Mpc. That is not 126 independent constraints: group membership and calibration correlate them. The new conditional identifiability forecast tests how this real footprint responds to a specified local template after allowing bulk flow, shear and distance-scale freedom.
Billions of imaging detections are not billions of measured distances or velocities. This release uses the measured data available to us; it does not invent missing redshifts, fill survey gaps with simulated observations, or claim that a trillion-galaxy catalog has been ingested.
Open the conditional Great Attractor forecast ↗ · Selections, reproducibility & next inference stage ↗
Download the measured coverage comparison · PDF · PNG figure
DESI DR1 release paper · NOIRLab catalog documentation · Cosmicflows-4 paper and tables
Full normalized CF4 table · CSV · Full DESI bin inventory · CSV · Data acknowledgments and licenses
DESI was filtered and aggregated; CF4 was parsed into documented columns with method-presence flags. These derived products do not constitute a new cosmological fit. Data credits and terms are separate from the software license.
