Pith Number

pith:VLEIDM3T

pith:2026:VLEIDM3TD2PQFYRFN654DKWW4M

not attested not anchored not stored refs resolved

UNIONS-3500 Weak Lensing: I. A Galaxy Shape Catalogue in the Northern Sky

A. Guinot, A. Paradis, A. Tersenov, A. Wittje, A. W. McConnachie, C. Bonini, C. Daley, C. Murray, F. Hervas-Peters, H. Hildebrandt, J.-C. Cuillandre, L. Baumont, L. van Waerbeke, L. W. K. Goh, M. J. Hudson, M. Kilbinger, S. Fabbro, S. Guerrini

The UNIONS survey has produced a galaxy shape catalogue of 62 million objects over 3500 square degrees for weak lensing cosmology.

arxiv:2605.13549 v1 · 2026-05-13 · astro-ph.CO

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\usepackage{pith}
\pithnumber{VLEIDM3TD2PQFYRFN654DKWW4M}

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Record completeness

1 Bitcoin timestamp

2 Internet Archive

3 Author claim open · sign in to claim

4 Citations open

5 Replications open

✓ Portable graph bundle live · download bundle · merged state

The bundle contains the canonical record plus signed events. A mirror can host it anywhere and recompute the same current state with the deterministic merge algorithm.

Claims

C1strongest claim

The final galaxy catalogue contains 62 million galaxies, corresponding to an effective source density of 4.96 arcmin^{-2}. The ellipticity dispersion, commonly referred to as shape noise, is σ_ε = 0.27.

C2weakest assumption

That the PSF modeling, shape measurement, and validation tests have successfully mitigated leakage of PSF ellipticity into galaxy shapes without introducing significant residual systematics, as claimed after the described correlation checks.

C3one line summary

A catalogue of 62 million galaxy shapes from 3500 sq deg of UNIONS r-band imaging achieves an effective source density of 4.96 arcmin^{-2} and shape noise of 0.27 after PSF calibration and validation.

References

299 extracted · 299 resolved · 7 Pith anchors

[1] arXiv e-prints , keywords =

[2] UNIONS: The impact of systematic errors on weak-lensing peak counts. , keywords =. doi:10.1051/0004-6361/202243899 , archivePrefix =. 2204.06280 , primaryClass = · doi:10.1051/0004-6361/202243899

[3] ShapePipe: a new shape measurement pipeline and weak-lensing application to UNIONS/CFIS data

[4] J., Cuillandre, J.-C., et al · doi:10.1093/mnras/stad1519

[5] Multi-CCD modelling of the point spread function. , keywords =. doi:10.1051/0004-6361/202039584 , adsurl = · doi:10.1051/0004-6361/202039584

Receipt and verification

First computed	2026-05-18T02:44:23.812781Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

aac881b3731e9f02e2256fbbc1aad6e31724ff0dd2e3ca48a2c010234000bf87

Aliases

arxiv: 2605.13549 · arxiv_version: 2605.13549v1 · doi: 10.48550/arxiv.2605.13549 · pith_short_12: VLEIDM3TD2PQ · pith_short_16: VLEIDM3TD2PQFYRF · pith_short_8: VLEIDM3T

Agent API

Resolver JSON Graph JSON Events JSON Schema Signing key

Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/VLEIDM3TD2PQFYRFN654DKWW4M \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: aac881b3731e9f02e2256fbbc1aad6e31724ff0dd2e3ca48a2c010234000bf87

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "472bd424e429736a1dc1a1986e21d79d19141de572eb1dcb1b3a51e112171be7",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.CO",
    "submitted_at": "2026-05-13T13:56:31Z",
    "title_canon_sha256": "4e136d7e87f6b263db7d8a9e263b26a504665f1183adda584de28aa6ea6c8b3a"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.13549",
    "kind": "arxiv",
    "version": 1
  }
}