Pith Number

pith:V6UXMC3U

pith:2026:V6UXMC3UXTNQECS6YMVOLZ4TMT

not attested not anchored not stored refs resolved

Robust AGN and host-galaxy decomposition in optical spectral fitting

A. L. Rankine, A. Merloni, A. M. Koekemoer, B. Trakhtenbrot, C. Andonie, C. A. Negrete Pe\~naloza, C. Aydar, D. P. Schneider, F. E. Bauer, G. Zeltyn, H. Javier Ibarra-Medel, J. Buchner, J. R. Brownstein, K. Nandra, M. Krumpe, M. L. Mart\'inez-Aldama, M. Salvato, Q. Wu, R. J. Assef, S. Bernal, S. F. Anderson, S. F. Sanchez, S. LaMassa, S. Morrison, T. Dwelly, W. N. Brandt, Y. Shen

A combined spectral fitting technique reliably separates AGN and stellar components, yielding consistent physical properties across different activity states.

arxiv:2604.27783 v1 · 2026-04-30 · astro-ph.GA · astro-ph.IM

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\usepackage{pith}
\pithnumber{V6UXMC3UXTNQECS6YMVOLZ4TMT}

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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

For host-derived properties, especially when fAGN<0.8, our method yields consistent results. For single-epoch black-hole mass estimates from Ha and Hb, 3-sigma confidence in the broad-line flux and FWHM provides effective criteria for selecting reliable measurements. After applying these quality cuts, measurements across different epochs agree within uncertainties.

C2weakest assumption

The spectral decomposition accurately isolates the AGN continuum and broad lines from the stellar component without significant residuals or template mismatches, particularly when the AGN state changes between epochs.

C3one line summary

Combining pPXF and PyQSOFit yields robust AGN-host decomposition in optical spectra, giving consistent host properties below 80% AGN continuum fraction and reliable single-epoch black hole masses when broad-line measurements exceed 3-sigma significance.

References

2 extracted · 2 resolved · 0 Pith anchors

[1] Abazajian, K. N., Adelman-McCarthy, J. K., Agüeros, M. A., et al. 2009, ApJS, 182, 543 Abdurro’uf, Accetta, K., Aerts, C., et al. 2022, ApJS, 259, 35 Almeida, A., Anderson, S. F., Argudo-Fernández, M. 2009

[2] validation is more realistic than relying on the statistical uncertainty 1994

Cited by

1 paper in Pith

AGN radiative feedback as the main regulator of [O III] outflow activity and obscuration in X-ray AGN

Receipt and verification

First computed	2026-06-10T14:10:51.605666Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

afa9760b74bcdb020a5ec32ae5e79364f14275e8958e8685abc2103417a60fe1

Aliases

arxiv: 2604.27783 · arxiv_version: 2604.27783v1 · doi: 10.48550/arxiv.2604.27783 · pith_short_12: V6UXMC3UXTNQ · pith_short_16: V6UXMC3UXTNQECS6 · pith_short_8: V6UXMC3U

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/V6UXMC3UXTNQECS6YMVOLZ4TMT \
  | 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: afa9760b74bcdb020a5ec32ae5e79364f14275e8958e8685abc2103417a60fe1

Canonical record JSON

{
  "metadata": {
    "abstract_canon_sha256": "229e054daf445a7470847f694494f4514a8a9ff0efe0c7217b5d42c286bdecd9",
    "cross_cats_sorted": [
      "astro-ph.IM"
    ],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "astro-ph.GA",
    "submitted_at": "2026-04-30T12:23:08Z",
    "title_canon_sha256": "90a9283909faf0a72e79951d7bf620c0c100d5aa5d76832d23d323e9259da038"
  },
  "schema_version": "1.0",
  "source": {
    "id": "2604.27783",
    "kind": "arxiv",
    "version": 1
  }
}