Exploring Hard X-ray Properties of $γ$-ray Emitting Narrow Line Seyfert-I Galaxies through NuSTAR Observations
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2025
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866917145712001024 |
|---|---|
| author | Chaudhary, Suvas Chandra Prince, Raj van Soelen, Brian Meintjes, Pieter |
| author_facet | Chaudhary, Suvas Chandra Prince, Raj van Soelen, Brian Meintjes, Pieter |
| contents | We studied the six gamma-ray-detected Narrow Line Seyfert 1 (NLSy1) galaxies using the hard X-ray observations from Nuclear Spectroscopic Telescope Array (NuSTAR) and optical g- \& r-band from Zwicky Transient Facility (ZTF). The X-ray spectra corresponding to all objects are well-fitted with a power-law spectral model, and a strong "redder-when-brighter" trend is seen, which is mostly seen in Blazars. The X-ray light curves were produced for all the available observations, and the F$_{var}$ is estimated. In 1H 0323+342, we found that F$_{var}$ lies between 9$\%$ to 22$\%$, suggesting significant variability in the source. Similarly, for PKS 2004-447, we found F$_{var}$ lies between 10$\%$ to 21$\%$. We see a strong X-ray and $γ$-ray spectral index correlation among these objects, suggesting that these are produced through a similar process. Comparing the X-ray spectral index with other class objects, we see that NLSy1 galaxies are similar to LBL and IBL types. We see a negative trend of X-ray flux with the $γ$-ray luminosity in these objects, suggesting an anti-correlation between them. A similar trend is seen between the X-ray flux, total jet power, and disk luminosity. The X-ray spectral index also shows a negative trend with total jet power and disk luminosity. The optical variability amplitude (in magnitude) lies between 0.90 to 2.32, and the fractional variability varies from 13\% to 40\%. The color-magnitude plot shows mostly the redder-when-brighter (RWB) trend, suggesting $γ$-NLSy1 are much closer to FSRQs than BL Lacs. Our results, overall, summarize how the various parameters in gamma-ray-detected NLSy1 are connected. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_04492 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Exploring Hard X-ray Properties of $γ$-ray Emitting Narrow Line Seyfert-I Galaxies through NuSTAR Observations Chaudhary, Suvas Chandra Prince, Raj van Soelen, Brian Meintjes, Pieter High Energy Astrophysical Phenomena We studied the six gamma-ray-detected Narrow Line Seyfert 1 (NLSy1) galaxies using the hard X-ray observations from Nuclear Spectroscopic Telescope Array (NuSTAR) and optical g- \& r-band from Zwicky Transient Facility (ZTF). The X-ray spectra corresponding to all objects are well-fitted with a power-law spectral model, and a strong "redder-when-brighter" trend is seen, which is mostly seen in Blazars. The X-ray light curves were produced for all the available observations, and the F$_{var}$ is estimated. In 1H 0323+342, we found that F$_{var}$ lies between 9$\%$ to 22$\%$, suggesting significant variability in the source. Similarly, for PKS 2004-447, we found F$_{var}$ lies between 10$\%$ to 21$\%$. We see a strong X-ray and $γ$-ray spectral index correlation among these objects, suggesting that these are produced through a similar process. Comparing the X-ray spectral index with other class objects, we see that NLSy1 galaxies are similar to LBL and IBL types. We see a negative trend of X-ray flux with the $γ$-ray luminosity in these objects, suggesting an anti-correlation between them. A similar trend is seen between the X-ray flux, total jet power, and disk luminosity. The X-ray spectral index also shows a negative trend with total jet power and disk luminosity. The optical variability amplitude (in magnitude) lies between 0.90 to 2.32, and the fractional variability varies from 13\% to 40\%. The color-magnitude plot shows mostly the redder-when-brighter (RWB) trend, suggesting $γ$-NLSy1 are much closer to FSRQs than BL Lacs. Our results, overall, summarize how the various parameters in gamma-ray-detected NLSy1 are connected. |
| title | Exploring Hard X-ray Properties of $γ$-ray Emitting Narrow Line Seyfert-I Galaxies through NuSTAR Observations |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2504.04492 |