Pith Number

pith:P4IFD5LL

pith:2026:P4IFD5LLSXKCRSNOHQBY3FQKJ6

not attested not anchored not stored refs resolved

COOL-LAMPS IX: A Rare Duo of Quasars Each Lensed by a Single Massive Galaxy Cluster

Aidan P. Cloonan, Allison Noble, Andi M. Kisare, Antony A. Stark, Brian Welch, Erik Solhaug, Gourav Khullar, Grace C. Wagner, Guillaume Mahler, H{\aa}kon Dahle, Isaiah R. Escapa, Jane R. Rigby, Kabelo Tsiane, Kate Napier, Keren Sharon, Matthew B. Bayliss, Michael D. Gladders, Michael K. Florian, Natalie Malagon, Riley Rosener, Simon D. Mork, T. Emil Rivera-Thorsen, Yifan "Megan" Zhao

One galaxy cluster lenses two background quasars, each into four images.

arxiv:2605.13514 v1 · 2026-05-13 · astro-ph.GA

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\usepackage{pith}
\pithnumber{P4IFD5LLSXKCRSNOHQBY3FQKJ6}

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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 system features two multiply-imaged quasars each lensed into four images by the same z=0.4301 cluster: a classic broad-line Type I quasar at z=1.524 (COOLJ1153A) and a dust-obscured Type II quasar at z=1.939 (COOLJ1153B), with maximum image separations of 25.6 and 26.0 arcsec respectively.

C2weakest assumption

That the multiple images identified in DECaLS imaging and confirmed with Magellan/NOT spectroscopy truly belong to single background quasars at the stated redshifts and that the simple lens model accurately recovers the cluster mass and time delays without significant contamination or misidentification.

C3one line summary

A single galaxy cluster lenses two quasars (one Type I at z=1.524, one dust-obscured Type II at z=1.939) into four images each, yielding a projected mass of ~3.3e14 solar masses within 500 kpc and time delays of hundreds to over 1000 days.

References

138 extracted · 138 resolved · 61 Pith anchors

[1] The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package · doi:10.3847/1538-3881/aabc4f

[4] Quantifying the Observational Effort Required for the Radial Velocity Characterization of TESS Planets 2018 · doi:10.3847/1538-3881/aacea9

[5] X-ray Scattering Echoes and Ghost Halos from the Intergalactic Medium: Relation to the nature of AGN variability 2015 · doi:10.1088/0004-637x/805/1/23

[6] The 2013 Release of Cloudy. , keywords =. 2013 2013

[7] T _ E X and LAT _ E X Macro Definition Files for Astronomical Publications. , year = "1989", month = "Mar", pages = 1989

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-18T02:44:24.518699Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

7f1051f56b95d428c9ae3c038d960a4fb4ba3e78926d7f53e747fb85afda9772

Aliases

arxiv: 2605.13514 · arxiv_version: 2605.13514v1 · doi: 10.48550/arxiv.2605.13514 · pith_short_12: P4IFD5LLSXKC · pith_short_16: P4IFD5LLSXKCRSNO · pith_short_8: P4IFD5LL

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/P4IFD5LLSXKCRSNOHQBY3FQKJ6 \
  | 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: 7f1051f56b95d428c9ae3c038d960a4fb4ba3e78926d7f53e747fb85afda9772

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "6de4289e5a7baf279e7ccc8826fa7bce769c5b76ba9e46d2124ef881b85453fa",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-05-13T13:33:24Z",
    "title_canon_sha256": "5b1f60951171a70bc9d5fa7530af5880b0e5dc89a2bfd5ac5b49695e39946a39"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.13514",
    "kind": "arxiv",
    "version": 1
  }
}