Pith Number

pith:7VVUPXA7

pith:2026:7VVUPXA7WTNZIUXAYZROYGHXDG

not attested not anchored not stored refs resolved

RadioAstron reveals a change in the jet collimation profile of 3C 84

E. Ros, G. Bruni, G. Giovannini, M. Giroletti, M. M. Lisakov, P. Benke, T. Savolainen, Y. Y. Kovalev

RadioAstron data show the jet in 3C 84 shifted from quasi-cylindrical to parabolic collimation over three years.

arxiv:2604.06803 v1 · 2026-04-08 · astro-ph.GA

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\usepackage{pith}
\pithnumber{7VVUPXA7WTNZIUXAYZROYGHXDG}

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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

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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

Based on measuring the collimation profile, we find that it has evolved from being quasi-cylindrical to parabolic. This is most likely the result of the decreased pressure of the mini-cocoon, which was inflated by the jet and contains hot gas that cannot confine the jet efficiently as it propagates further away from the core.

C2weakest assumption

The interpretation that the observed change in collimation profile results specifically from decreased mini-cocoon pressure rather than variations in jet power, intrinsic changes in the ejection, or projection effects.

C3one line summary

New 2016 RadioAstron observations show the jet in 3C 84 evolved from quasi-cylindrical to parabolic collimation due to decreased mini-cocoon pressure.

References

89 extracted · 89 resolved · 0 Pith anchors

[1] A., Ackermann, M., Ajello, M., et al.\ 2009, , 699, 31 2009

[2] Aleksi \'c , J., Alvarez, E. A., Antonelli, L. A., et al.\ 2012, , 539, L2 2012

[3] & Nakamura, M.\ 2012, , 745, L28 2012

[4] A., An, T., Henkel, C., et al.\ 2022, Nature Astronomy, 6, 976 2022

[5] Baczko, A.-K., Ros, E., Kadler, M., et al.\ 2022, , 658, A119 2022

Formal links

2 machine-checked theorem links

Receipt and verification

First computed	2026-05-28T01:04:39.695311Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

fd6b47dc1fb4db9452e0c662ec18f7198c6a130e3c06adf9744d73d68f328ff1

Aliases

arxiv: 2604.06803 · arxiv_version: 2604.06803v1 · doi: 10.48550/arxiv.2604.06803 · pith_short_12: 7VVUPXA7WTNZ · pith_short_16: 7VVUPXA7WTNZIUXA · pith_short_8: 7VVUPXA7

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/7VVUPXA7WTNZIUXAYZROYGHXDG \
  | 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: fd6b47dc1fb4db9452e0c662ec18f7198c6a130e3c06adf9744d73d68f328ff1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "4743b1533a4b2837575840a8ab983da79c000f459e530c5524f6ac55103f13fb",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-04-08T08:17:22Z",
    "title_canon_sha256": "7dddba98159b7ec36cf8ce24a80926c3de980bfe393b3b91b4f73ee32222ebd7"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.06803",
    "kind": "arxiv",
    "version": 1
  }
}