Pith Number

pith:LMRJMOKE

pith:2026:LMRJMOKE3JAFCM45FQWUTBPS5Q

not attested not anchored not stored refs resolved

Infrared Line Diagnostics Fail to Constrain Sgr A*'s UV Output

Daryl Haggard, Giacomo Principe, Howard A. Smith, Joey Neilsen, Joseph L. Hora, Joseph M. Michail, Laurent Loinard, Mayura Balakrishnan, Nadeen B. Sabha, Nicole M. Ford, Sebastiano D. von Fellenberg, Sera Markoff, Shuo Zhang, Zach Sumners

Infrared emission lines near Sgr A* remain steady despite flares, preventing constraints on the black hole's instantaneous UV output.

arxiv:2605.13990 v1 · 2026-05-13 · astro-ph.HE · astro-ph.GA

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\usepackage{pith}
\pithnumber{LMRJMOKE3JAFCM45FQWUTBPS5Q}

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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

These results demonstrate that infrared emission lines trace a steady-state radiation field rather than individual flaring events, and therefore infrared line diagnostics cannot be used to constrain the instantaneous UV flux of Sgr A*.

C2weakest assumption

The line-emitting gas has light-crossing timescales of ~0.1-10 days and recombination/cooling timescales much longer than the flare duration, which suppresses any observable response to individual flares.

C3one line summary

Mid-infrared lines near Sgr A* exhibit no detectable variability during flares, because light-crossing and recombination timescales in the extended gas suppress responses, so the lines cannot constrain instantaneous UV flux.

References

61 extracted · 61 resolved · 2 Pith anchors

[1] P., & Satyapal, S 2008 · doi:10.1086/529013

[2] 2024a, ApJ, 974, 98, doi: 10.3847/1538-4357/ad6c08 2024 · doi:10.3847/1538-4357/ad6c08

[3] E., Matthews, K., Neugebauer, G., & Willner, S 1978 · doi:10.1086/155761

[4] E., & Neugebauer, G 1968 · doi:10.1086/149425

[5] S., & Wills, B 2002 · doi:10.1086/342420

Receipt and verification

First computed	2026-05-17T23:39:13.265105Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

5b22963944da4051339d2c2d4985f2ec2c926346c1ad4e9587a59a7b062564fc

Aliases

arxiv: 2605.13990 · arxiv_version: 2605.13990v1 · doi: 10.48550/arxiv.2605.13990 · pith_short_12: LMRJMOKE3JAF · pith_short_16: LMRJMOKE3JAFCM45 · pith_short_8: LMRJMOKE

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/LMRJMOKE3JAFCM45FQWUTBPS5Q \
  | 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: 5b22963944da4051339d2c2d4985f2ec2c926346c1ad4e9587a59a7b062564fc

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "e65f428ae747d3f58842fa23742ee351c9ecb31223bbf7f35f96d5430174b8b6",
    "cross_cats_sorted": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "primary_cat": "astro-ph.HE",
    "submitted_at": "2026-05-13T18:03:21Z",
    "title_canon_sha256": "fcb6e6a25cb92899b9a94b5a0b1c4b2048eb643edf4730b166d5fb5643921860"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2605.13990",
    "kind": "arxiv",
    "version": 1
  }
}