{
  "abstract": "Measurements of pulse profiles over a large frequency range can be used to investigate the frequency dependence of emission heights using aberration/retardation (A/R) analysis. A recent analysis using PSR B1237+25, a pulsar with a core/double-cone profile, shows no evidence for an increase in emission height with wavelength in observations made across a large range in frequencies from 5 GHz–30 MHz. Motivated by this intriguing result, we undertook a similar analysis of PSR B1451−68, a bright southern-sky pulsar with a somewhat different core/double-cone profile. We used eight profiles at six different frequencies—four from the Parkes/Murriyang telescope and four from the Murchison Widefield Array—spanning 8 GHz–80 MHz. Each profile was modeled with five Gaussian components, and these were used to measure the profile asymmetries attributable to A/R, and hence to estimate the emission heights. Our results show a dramatic increase in the outer conal width and height as predicted by “radius-to-frequency mapping” (RFM). However, the A/R emission heights decrease significantly at frequencies below 1 GHz, which is inconsistent with the RFM behavior. The fact that the outer conal emission heights apparently decrease at lower frequencies remains a mystery to be further investigated.",
  "abstract_shown": true,
  "affiliations": [
    "Curtin University",
    "University of Vermont"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 3,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "N. D. Ramesh Bhat",
      "orcid": "0000-0002-8383-5059"
    },
    {
      "affs": [
        0
      ],
      "name": "Christopher P. Lee",
      "orcid": "0000-0001-6840-4114"
    },
    {
      "affs": [
        1
      ],
      "name": "Joanna M. Rankin",
      "orcid": "0000-0002-8923-6065"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/e8s1cjc3xcvx8.bib",
  "cited_by": 0,
  "doi": "10.3847/1538-4357/ae8f3e",
  "fulltext_url": null,
  "id": "e8s1cjc3xcvx8",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://iopscience.iop.org/article/10.3847/1538-4357/ae8f3e",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Pulsars and Gravitational Waves Research"
    ]
  ],
  "openalex": "W7215077298",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/1538-4357/ae8f3e/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-01",
  "publisher": "American Astronomical Society",
  "ris": "https://research.draconitic.com/paper/e8s1cjc3xcvx8.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:11Z",
      "native_id": "10.3847/1538-4357/ae8f3e",
      "source": "crossref",
      "url": "https://iopscience.iop.org/article/10.3847/1538-4357/ae8f3e"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Pulsars and Gravitational Waves Research",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Aberration/Retardation Analysis of PSR B1451-68’s Profiles from Decimeter to Meter Wavelengths: Emission Heights and Implications for ‘Radius-to-Frequency Mapping’",
  "title_text": "Aberration/Retardation Analysis of PSR B1451-68’s Profiles from Decimeter to Meter Wavelengths: Emission Heights and Implications for ‘Radius-to-Frequency Mapping’",
  "type": "peer-reviewed",
  "updated_at": "2026-10-30T12:18:11Z",
  "url": "https://research.draconitic.com/paper/e8s1cjc3xcvx8",
  "venue": "The Astrophysical Journal",
  "versions": []
}