Pith Number

pith:USVKT75Q

pith:2026:USVKT75QW65Q6JIWBRMVIUTPEZ

not attested not anchored not stored refs resolved

The Demographics of Sagittarius A* X-ray Flares over 25 Years with Chandra

Daryl Haggard, Howard A. Smith, Joey Neilsen, Joseph L. Hora, Joseph M. Michail, Mayura Balakrishnan, Michael A. Nowak, Nicole M. Ford, Sebastiano D. von Fellenberg, Sera Markoff, Sophia S\'anchez-Maes, S. P. Willner, Zach Sumners

Chandra's 25-year Sgr A* catalog of 100 X-ray flares shows brighter events have harder spectra.

arxiv:2605.13962 v1 · 2026-05-13 · astro-ph.HE

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\usepackage{pith}
\pithnumber{USVKT75QW65Q6JIWBRMVIUTPEZ}

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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 expanded dataset supports previous indications of a correlation between X-ray flare hardness and luminosity. Spectral modeling corroborates this finding, showing a change in the X-ray spectral index, from Γ ∼ 3 to 2 with increasing flare brightness.

C2weakest assumption

Flare detection relies on accurate background subtraction and chosen count-rate thresholds in the Chandra monitoring data; any systematic bias in these steps would alter the reported sample size, luminosity range, and correlation strengths.

C3one line summary

A 25-year Chandra catalog of 100 Sgr A* X-ray flares confirms that brighter flares are spectrally harder and strengthens prior correlations with duration and fluence.

References

60 extracted · 60 resolved · 0 Pith anchors

[1] P., Tollerud , E 1999 · doi:10.1051/0004-6361/201322068

[2] Baganoff, F. K., Bautz, M. W., Brandt, W. N., et al. 2001, Nature, 413, 45, doi: 10.1038/35092510 2001 · doi:10.1038/35092510

[3] K., Maeda, Y., Morris, M., et al 2003 · doi:10.1086/375145

[4] archivePrefix = "arXiv", eprint = 2015 · doi:10.1088/0004-637x/802/1/69

[5] 2019, ApJ, 871, 161, doi: 10.3847/1538-4357/aaf71f 2019 · doi:10.3847/1538-4357/aaf71f

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-17T23:39:13.596121Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

a4aaa9ffb0b7bb0f25160c5954526f267b6d58f320b47526e9eea8528beeb432

Aliases

arxiv: 2605.13962 · arxiv_version: 2605.13962v1 · doi: 10.48550/arxiv.2605.13962 · pith_short_12: USVKT75QW65Q · pith_short_16: USVKT75QW65Q6JIW · pith_short_8: USVKT75Q

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/USVKT75QW65Q6JIWBRMVIUTPEZ \
  | 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: a4aaa9ffb0b7bb0f25160c5954526f267b6d58f320b47526e9eea8528beeb432

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "3d0e40297df00c08e526d9d42b2dec4fa6f580aee5e6093e1adcba274675c57a",
    "cross_cats_sorted": [],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2026-05-13T18:00:02Z",
    "title_canon_sha256": "a4464ec32bcb518c9a2bf8730be527a44bb1ba9e79d92b20dff193228f750c75"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.13962",
    "kind": "arxiv",
    "version": 1
  }
}