Pith Number

pith:AKMX2EDT

pith:2026:AKMX2EDTAIFK37YEP26P3KHX7U

not attested not anchored not stored refs resolved

Unveiling the dynamics of the ultra-fast outflow in IRAS 13224-3809 with X-ray spectroscopy

Alessia Tortosa, Alfredo Luminari, Enrico Piconcelli, Fabrizio Nicastro, Francesco Tombesi, Giorgio Lanzuisi, Luca Zappacosta, Marco Laurenti, Massimo Gaspari, Pierpaolo Cond\`o, Riccardo Middei, Roberto Serafinelli

IRAS 13224-3809 hosts a variable ultra-fast outflow exceeding 0.2c that accelerates rapidly during X-ray flares.

arxiv:2604.27061 v1 · 2026-04-29 · astro-ph.HE · astro-ph.GA

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\usepackage{pith}
\pithnumber{AKMX2EDTAIFK37YEP26P3KHX7U}

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Record completeness

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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

We unambiguously confirm the presence of a strong, variable outflow with velocities exceeding 0.2c, and find that models including absorption consistently reveal robust physical trends: a velocity-luminosity correlation of the UFO, persistently large line widths, and no compelling equivalent-width-flux anti-correlation. We also report clear evidence for rapid acceleration of the wind in response to X-ray flares.

C2weakest assumption

That the identified absorption features are correctly attributed to a photo-ionized ultra-fast outflow rather than being mimicked by emission or relativistic reflection components, and that the equal-count spectral selections and background treatment do not introduce systematic biases in the fitted trends.

C3one line summary

Reanalysis of 2016 XMM-Newton and NuSTAR data confirms a strong variable ultra-fast outflow in IRAS 13224-3809 with velocities >0.2c, velocity-luminosity correlation, rapid flare response, and evidence favoring magnetic over radiative driving.

References

2 extracted · 2 resolved · 0 Pith anchors

[1] An, H., Madsen, K. K., Westergaard, N. J., et al. 2014, in Society of Photo- Optical Instrumentation Engineers (SPIE) Conference Series, V ol. 9144, Space Telescopes and Instrumentation 2014: Ultravio 2014

[2] The code requires an ionizing spectral energy distribution (SED) and parameters describing the physical properties of the absorbing gas 2024

Receipt and verification

First computed	2026-06-19T16:10:37.928152Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

02997d1073020aadff047ebcfda8f7fd2f91b29aa30de02ee735b366e8f26590

Aliases

arxiv: 2604.27061 · arxiv_version: 2604.27061v1 · doi: 10.48550/arxiv.2604.27061 · pith_short_12: AKMX2EDTAIFK · pith_short_16: AKMX2EDTAIFK37YE · pith_short_8: AKMX2EDT

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/AKMX2EDTAIFK37YEP26P3KHX7U \
  | 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: 02997d1073020aadff047ebcfda8f7fd2f91b29aa30de02ee735b366e8f26590

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "2479468df79b367a811d1d8d7de32922dddc20d88566f56f58164fcc79034bc7",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2026-04-29T18:01:02Z",
    "title_canon_sha256": "0da35edb169e33154d02318e4b86b62eabfdc3eb152635afdda9332e40962c04"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.27061",
    "kind": "arxiv",
    "version": 1
  }
}