Pith Number

pith:QYDPZFFZ

pith:2026:QYDPZFFZ3A2SIYV6ZF2OVXMHZG

not attested not anchored not stored refs resolved

The Rapid ASKAP Continuum Survey VII: Spectra and Polarisation In Cutouts of Extragalactic Sources (SPICE-RACS) Second Data Release -- Unveiling the Magnetised Sky

Alec J.M. Thomson, B. M. Gaensler, C. L. Van Eck, Craig S. Anderson, Emil Lenc, Erik Osinga, George Heald, J. L. West, J. P. Leahy, Lerato Baidoo, L. Rudnick, N. M. McClure-Griffiths, Ondrej Hlinka, Sebastian Hutschenreuter, Shane P. O'Sullivan, Stefan W. Duchesne, Sunil Malik, Takuya Akahori, Timothy J. Galvin, Vanessa A. Moss, Y. K. Ma

SPICE-RACS DR2 produces the largest Faraday rotation measure catalog yet, with 250,000 entries covering 87.5 percent of the sky.

arxiv:2605.16917 v1 · 2026-05-16 · astro-ph.GA

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\usepackage{pith}
\pithnumber{QYDPZFFZ3A2SIYV6ZF2OVXMHZG}

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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

This places SPICE-RACS DR2 as the largest single RM catalogue ever produced by nearly an order of magnitude; the number of RMs in our catalogue alone is ∼5 times larger than every previous RM catalogue combined.

C2weakest assumption

The de-duplication and polarization extraction process correctly identifies reliable RMs without significant contamination from residual instrumental polarization or source confusion, as stated in the description of the 0.1% residual level and 8-sigma threshold.

C3one line summary

SPICE-RACS DR2 produces the largest single Faraday rotation measure catalog to date from RACS-low3 observations, with 2.5e5 RMs at 6.7 per square degree over most of the southern sky.

References

297 extracted · 297 resolved · 94 Pith anchors

[1] doi:10.1086/190709 , journal = · doi:10.1086/190709

[2] doi:10.1007/BF00639497 , journal = · doi:10.1007/bf00639497

[3] doi:10.1086/171000 , journal = · doi:10.1086/171000

[4] doi:10.1086/175726 , journal = · doi:10.1086/175726

[5] doi:10.1086/176803 , journal = · doi:10.1086/176803

Formal links

1 machine-checked theorem link

Receipt and verification

First computed	2026-05-20T00:03:30.346685Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

8606fc94b9d8352462bec974eadd87c99468057264ac90012c53f1c12f5fd1e3

Aliases

arxiv: 2605.16917 · arxiv_version: 2605.16917v1 · doi: 10.48550/arxiv.2605.16917 · pith_short_12: QYDPZFFZ3A2S · pith_short_16: QYDPZFFZ3A2SIYV6 · pith_short_8: QYDPZFFZ

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/QYDPZFFZ3A2SIYV6ZF2OVXMHZG \
  | 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: 8606fc94b9d8352462bec974eadd87c99468057264ac90012c53f1c12f5fd1e3

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "15599c4c0904c0c38a99a34923a7eb40c81153e955e554456420f4d0aaa487c9",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-05-16T10:13:47Z",
    "title_canon_sha256": "4f65f4593bb1af3e5336588f7970240e8622901b65dcdbe1893faa56be9d1cc0"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.16917",
    "kind": "arxiv",
    "version": 1
  }
}