Investigating the Spectral Nature of Gigahertz-peaked Spectra Pulsar Candidates
We report the measurements of low radio frequency spectra of 14 gigahertz-peaked spectra (GPS) pulsar candidates, between 300 and 700 MHz, using the upgraded Giant Metrewave Radio Telescope. Combining newly collected measurements with archival results, the spectral nature of each pulsar was examined...
Saved in:
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2025-01-01
|
| Series: | The Astrophysical Journal |
| Subjects: | |
| Online Access: | https://doi.org/10.3847/1538-4357/adc726 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849315541532016640 |
|---|---|
| author | K. Rożko J. Kijak R. Basu P. Dabhade W. Lewandowski |
| author_facet | K. Rożko J. Kijak R. Basu P. Dabhade W. Lewandowski |
| author_sort | K. Rożko |
| collection | DOAJ |
| description | We report the measurements of low radio frequency spectra of 14 gigahertz-peaked spectra (GPS) pulsar candidates, between 300 and 700 MHz, using the upgraded Giant Metrewave Radio Telescope. Combining newly collected measurements with archival results, the spectral nature of each pulsar was examined using four different physical models: simple power law, broken power law, low-frequency turnover power law, and free–free thermal absorption. Based on this analysis, we confirm the GPS nature of five pulsars, three of them being new detections. In addition, one pulsar can be classified as having a broken power law spectrum, and we found the typical power-law spectra in four other cases. In the remaining four pulsars, the spectra showed tendencies of low-frequency turnover that require further investigations at lower frequency ranges. These results demonstrate the effectiveness of wideband measurements at low frequencies, below 1 GHz, in characterizing the spectral nature in pulsars. Our results also underline the need for more systematic theoretical studies to refine existing models and better interpret pulsar emission properties. |
| format | Article |
| id | doaj-art-85d42d9ad76b4a43a8e5c967b50bb93f |
| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-85d42d9ad76b4a43a8e5c967b50bb93f2025-08-20T03:52:07ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01984210210.3847/1538-4357/adc726Investigating the Spectral Nature of Gigahertz-peaked Spectra Pulsar CandidatesK. Rożko0https://orcid.org/0000-0002-1756-9629J. Kijak1https://orcid.org/0000-0001-9577-708XR. Basu2https://orcid.org/0000-0003-1824-4487P. Dabhade3https://orcid.org/0000-0001-9212-3574W. Lewandowski4https://orcid.org/0000-0003-0513-9442Janusz Gil Institute of Astronomy, University of Zielona Góra , ul. Prof. Z. Szafrana 2, 65-516 Zielona Góra, Poland ; krozko@uz.zgora.plJanusz Gil Institute of Astronomy, University of Zielona Góra , ul. Prof. Z. Szafrana 2, 65-516 Zielona Góra, Poland ; krozko@uz.zgora.plJanusz Gil Institute of Astronomy, University of Zielona Góra , ul. Prof. Z. Szafrana 2, 65-516 Zielona Góra, Poland ; krozko@uz.zgora.plAstrophysics Division, National Centre for Nuclear Research , Pasteura 7, 02-093 Warsaw, PolandJanusz Gil Institute of Astronomy, University of Zielona Góra , ul. Prof. Z. Szafrana 2, 65-516 Zielona Góra, Poland ; krozko@uz.zgora.plWe report the measurements of low radio frequency spectra of 14 gigahertz-peaked spectra (GPS) pulsar candidates, between 300 and 700 MHz, using the upgraded Giant Metrewave Radio Telescope. Combining newly collected measurements with archival results, the spectral nature of each pulsar was examined using four different physical models: simple power law, broken power law, low-frequency turnover power law, and free–free thermal absorption. Based on this analysis, we confirm the GPS nature of five pulsars, three of them being new detections. In addition, one pulsar can be classified as having a broken power law spectrum, and we found the typical power-law spectra in four other cases. In the remaining four pulsars, the spectra showed tendencies of low-frequency turnover that require further investigations at lower frequency ranges. These results demonstrate the effectiveness of wideband measurements at low frequencies, below 1 GHz, in characterizing the spectral nature in pulsars. Our results also underline the need for more systematic theoretical studies to refine existing models and better interpret pulsar emission properties.https://doi.org/10.3847/1538-4357/adc726Radio pulsarsInterstellar mediumRadio interferometrySpectral index |
| spellingShingle | K. Rożko J. Kijak R. Basu P. Dabhade W. Lewandowski Investigating the Spectral Nature of Gigahertz-peaked Spectra Pulsar Candidates The Astrophysical Journal Radio pulsars Interstellar medium Radio interferometry Spectral index |
| title | Investigating the Spectral Nature of Gigahertz-peaked Spectra Pulsar Candidates |
| title_full | Investigating the Spectral Nature of Gigahertz-peaked Spectra Pulsar Candidates |
| title_fullStr | Investigating the Spectral Nature of Gigahertz-peaked Spectra Pulsar Candidates |
| title_full_unstemmed | Investigating the Spectral Nature of Gigahertz-peaked Spectra Pulsar Candidates |
| title_short | Investigating the Spectral Nature of Gigahertz-peaked Spectra Pulsar Candidates |
| title_sort | investigating the spectral nature of gigahertz peaked spectra pulsar candidates |
| topic | Radio pulsars Interstellar medium Radio interferometry Spectral index |
| url | https://doi.org/10.3847/1538-4357/adc726 |
| work_keys_str_mv | AT krozko investigatingthespectralnatureofgigahertzpeakedspectrapulsarcandidates AT jkijak investigatingthespectralnatureofgigahertzpeakedspectrapulsarcandidates AT rbasu investigatingthespectralnatureofgigahertzpeakedspectrapulsarcandidates AT pdabhade investigatingthespectralnatureofgigahertzpeakedspectrapulsarcandidates AT wlewandowski investigatingthespectralnatureofgigahertzpeakedspectrapulsarcandidates |