Investigating the spectral nature of gigahertz-peaked spectra pulsar candidates
Fuente:
arXiv
Salvato in:
| Autori principali: | , , , , |
|---|---|
| Natura: | Preprint |
| Pubblicazione: |
2025
|
| Soggetti: | |
| Accesso online: | |
| Tags: |
Aggiungi Tag
Nessun Tag, puoi essere il primo ad aggiungerne!!
|
| _version_ | 1866915236918853632 |
|---|---|
| author | Rożko, K. Kijak, J. Basu, R. Dabhade, P. Lewandowski, W. |
| author_facet | Rożko, K. Kijak, J. Basu, R. Dabhade, P. Lewandowski, W. |
| contents | We report the measurements of low radio frequency spectra of fourteen gigahertz-peaked spectra (GPS) pulsar candidates, between 300~MHz and 700~MHz, using the upgraded Giant Meterwave 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 turn-over 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 turn-over 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 | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_08393 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Investigating the spectral nature of gigahertz-peaked spectra pulsar candidates Rożko, K. Kijak, J. Basu, R. Dabhade, P. Lewandowski, W. High Energy Astrophysical Phenomena We report the measurements of low radio frequency spectra of fourteen gigahertz-peaked spectra (GPS) pulsar candidates, between 300~MHz and 700~MHz, using the upgraded Giant Meterwave 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 turn-over 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 turn-over 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. |
| title | Investigating the spectral nature of gigahertz-peaked spectra pulsar candidates |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2504.08393 |