Pith Number

pith:44Z4JOLU

pith:2026:44Z4JOLUQSM3N2NGCNB6REHLMT

not attested not anchored not stored refs resolved

Hamilton's Object Revisited: A challenging source redshift of a strong lensing configuration

Emilio E. Falco, Jenny Wagner, Richard E. Griffiths

Re-analysis of spectra confirms Hamilton's object has redshift 0.82 rather than 3.2

arxiv:2604.19867 v1 · 2026-04-21 · astro-ph.GA · astro-ph.CO

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\usepackage{pith}
\pithnumber{44Z4JOLUQSM3N2NGCNB6REHLMT}

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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 re-evaluation confirms the previous result based on 6 absorption features, z=0.820 ± 0.001 and 4 emission features, z=0.821 ± 0.002. The alternative z=3.199± 0.003, based on 6 absorption and 2 emission lines is a worse fit, also compared to other spectra.

C2weakest assumption

That the chosen line identifications at z=0.82 are the correct physical assignment and that the PypeIt pipeline plus custom Python fitting routines introduce no systematic wavelength or flux errors that would alter the relative goodness-of-fit between the two redshift solutions.

C3one line summary

Re-analysis of KCWI spectra with PypeIt confirms Hamilton's object redshift at z=0.820, showing the MOIRCS z=3.2 fit is worse and the earlier data inconclusive due to slit coverage and calibration issues.

References

40 extracted · 40 resolved · 0 Pith anchors

[1] Bayliss, M. B., Hennawi, J. F., Gladders, M. D., et al. 2011, ApJS, 193, 8 2011

[2] B., Grillo, C., Rosati, P., et al 2017

[3] 2025, MNRAS, 537, 2662 2025

[4] 2018, A&A, 617, A62 2018

[5] E., Rudisel, M., Wagner, J., et al 2021

Receipt and verification

First computed	2026-06-10T14:10:50.518145Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e733c4b9748499b6e9a61343e890eb64ded29b897e797b20c5f7768455337ff9

Aliases

arxiv: 2604.19867 · arxiv_version: 2604.19867v1 · doi: 10.48550/arxiv.2604.19867 · pith_short_12: 44Z4JOLUQSM3 · pith_short_16: 44Z4JOLUQSM3N2NG · pith_short_8: 44Z4JOLU

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/44Z4JOLUQSM3N2NGCNB6REHLMT \
  | 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: e733c4b9748499b6e9a61343e890eb64ded29b897e797b20c5f7768455337ff9

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6192877fc4f3d605c03c57293aa4ae7b49039b3aab0c92e3b173284e7a76a05f",
    "cross_cats_sorted": [
      "astro-ph.CO"
    ],
    "license": "http://creativecommons.org/licenses/by-nc-nd/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-04-21T18:00:01Z",
    "title_canon_sha256": "f35b90bcf1af4401b67e4e5cbf51ff4887fe0dcd4cbf0cc41c296ca1013fd63d"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.19867",
    "kind": "arxiv",
    "version": 1
  }
}