Discern Misclassified flat-spectrum radio quasars from low-frequency peaked BL Lacertae objects
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866916664742772736 |
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| author | Liang, S. Yang, W. G. Zheng, Y. G. Kang, S. J. |
| author_facet | Liang, S. Yang, W. G. Zheng, Y. G. Kang, S. J. |
| contents | A sample of 312 low-frequency peaked BL Lacertae objects (LBLs) and 694 flat spectrum radio quasars (FSRQs) with the parameters both redshift and $γ$-ray photon spectral index ($Γ_γ$) is compiled from the active galactic nuclei (AGNs) Catalog Data Release 2 (4LAC-DR2) from Fermi-LAT. The multi-wavelength data of the sample sources are downloaded from the Space Science Data Center (SSDC), and then match the corresponding gamma-ray data from 4FGL-DR2. The synchrotron radiation peak frequency and Compton dominance (CD) parameters of the sources are obtained by using a log-parabolic to fit the average-state multi-wavelength spectral energy distribution. A support vector machine (SVM) in the $\log L_γ$-$Γ_γ$ frame is utilized to delineate the optimal boundary between FSRQs and LBLs sources. The 1$σ$ position of the Gaussian fitting on the histograms of the $Γ_γ$, $\log ν^{syn}_{peak}$, and CD parameter distributions are also introduced. In the criterion, 25 FSRQ candidates are selected from LBL sample sources. The optical spectral identification result confirms that 8 out of 13 candidate sources available with the optical spectral data exhibit the relationship of $EW > 5 \mathring{\mathrm{A}}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_22229 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Discern Misclassified flat-spectrum radio quasars from low-frequency peaked BL Lacertae objects Liang, S. Yang, W. G. Zheng, Y. G. Kang, S. J. High Energy Astrophysical Phenomena A sample of 312 low-frequency peaked BL Lacertae objects (LBLs) and 694 flat spectrum radio quasars (FSRQs) with the parameters both redshift and $γ$-ray photon spectral index ($Γ_γ$) is compiled from the active galactic nuclei (AGNs) Catalog Data Release 2 (4LAC-DR2) from Fermi-LAT. The multi-wavelength data of the sample sources are downloaded from the Space Science Data Center (SSDC), and then match the corresponding gamma-ray data from 4FGL-DR2. The synchrotron radiation peak frequency and Compton dominance (CD) parameters of the sources are obtained by using a log-parabolic to fit the average-state multi-wavelength spectral energy distribution. A support vector machine (SVM) in the $\log L_γ$-$Γ_γ$ frame is utilized to delineate the optimal boundary between FSRQs and LBLs sources. The 1$σ$ position of the Gaussian fitting on the histograms of the $Γ_γ$, $\log ν^{syn}_{peak}$, and CD parameter distributions are also introduced. In the criterion, 25 FSRQ candidates are selected from LBL sample sources. The optical spectral identification result confirms that 8 out of 13 candidate sources available with the optical spectral data exhibit the relationship of $EW > 5 \mathring{\mathrm{A}}$. |
| title | Discern Misclassified flat-spectrum radio quasars from low-frequency peaked BL Lacertae objects |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2503.22229 |