Pith Number

pith:PECGASI5

pith:2026:PECGASI577353IQ37BSWAETPOY

not attested not anchored not stored refs resolved

A XRISM view of the iron line complex in NGC 1068: Rethinking the prototypical Compton-thick AGN

A. Comastri, A. De Rosa, A. Luminari, A. Marinucci, A. Tortosa, B. Vander Meulen, C. Pinto, C. Vignali, D. Tagliacozzo, E. Bertola, E. Kammoun, E. Nardini, E. Piconcelli, F. Nicastro, F. Panessa, F. Tombesi, F. Ursini, G. Matt, G. Matzeu, G. Miniutti, G. Ponti, K. Iwasawa, L. Zappacosta, M. Dadina, M. Guainazzi, M. Laurenti, P. Cond\`o, P.-O. Petrucci, P. Severgnini, R. Della Ceca, R. Middei, R. Serafinelli, S. Bianchi, V. Braito, V. E. Gianolli

NGC 1068 iron lines show neutral fluorescence arises in optically thin gas rather than a classical Compton-thick reflector.

arxiv:2602.16252 v2 · 2026-02-18 · astro-ph.HE · astro-ph.GA

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\pithnumber{PECGASI577353IQ37BSWAETPOY}

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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 observed Fe Kβ/Kα ratio, together with the stringent upper limit on the Compton shoulder (≲8--11% of the core flux), disfavour reflection dominated by a homogeneous, classical Compton-thick medium, indicating that most of the neutral Fe Kα emission arises in optically thin or moderately Compton-thick gas.

C2weakest assumption

The assumption that the large velocity widths of the Fe XXV and Fe XXVI lines directly trace the same biconical outflow seen in optical [O III] and infrared [O IV] lines without requiring detailed kinematic modeling or spatial information.

C3one line summary

XRISM data on NGC 1068 indicates neutral Fe K fluorescence originates in optically thin gas and ionized lines trace a fast outflow, implying complex geometry in this Compton-thick AGN.

References

76 extracted · 76 resolved · 0 Pith anchors

[1] Anders, E. & Grevesse, N. 1989, Geochim. Cosmochim. Acta, 53, 197 1989

[2] 1993, ARA&A, 31, 473 1993

[3] 1994, ApJ, 430, 210 1994

[4] Antonucci, R. R. J. & Miller, J. S. 1985, ApJ, 297, 621 1985

[5] Arnaud, K. A. 1996, in ASP Conf. Ser., V ol. 101, Astronomical Data Analysis Software and Systems V , ed. G. H. Jacoby & J. Barnes, 17 1996

Formal links

2 machine-checked theorem links

Cited by

1 paper in Pith

Is XRISM/Resolve probing a "raining" absorber in Mrk 509?

Receipt and verification

First computed	2026-05-17T23:39:16.082219Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

790460491dfff7dda21bf86560126f760d75f2797e591dfe0e2648fd507f662f

Aliases

arxiv: 2602.16252 · arxiv_version: 2602.16252v2 · doi: 10.48550/arxiv.2602.16252 · pith_short_12: PECGASI57735 · pith_short_16: PECGASI577353IQ3 · pith_short_8: PECGASI5

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/PECGASI577353IQ37BSWAETPOY \
  | 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: 790460491dfff7dda21bf86560126f760d75f2797e591dfe0e2648fd507f662f

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e836db8156ce302d0e8fe0631920e8c3de5f8629cb30087a8f626b8c94ed31d2",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2026-02-18T08:02:12Z",
    "title_canon_sha256": "11d4f92a45836b4232d2db6220c0af02ed7f9ec7b0606b2c03abc27715136d07"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2602.16252",
    "kind": "arxiv",
    "version": 2
  }
}