Windy or not: Radio pc-scale evidence for a broad-line region wind in radio-quiet quasars
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866910580982415360 |
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| author | Chen, Sina Laor, Ari Behar, Ehud Baldi, Ranieri D. Gelfand, Joseph D. Kimball, Amy E. McHardy, Ian M. Orosz, Gabor Paragi, Zsolt |
| author_facet | Chen, Sina Laor, Ari Behar, Ehud Baldi, Ranieri D. Gelfand, Joseph D. Kimball, Amy E. McHardy, Ian M. Orosz, Gabor Paragi, Zsolt |
| contents | Does a broad-line region (BLR) wind in radio-quiet (RQ) active galactic nuclei (AGN) extend to pc scales and produce radio emission? We explore the correlations between a pc-scale radio wind and the BLR wind in a sample of 19 RQ Palomar-Green (PG) quasars. The radio wind is defined based on the spectral slope and the compactness of the emission at 1.5-5 GHz, and the BLR wind is defined by the excess blue wing in the C IV emission line profile. The five objects with both radio and BLR wind indicators are found at high Eddington ratios L/L_Edd (> 0.66), and eight of the nine objects with neither radio nor BLR winds reside at low L/L_Edd (< 0.28). This suggests that the BLR wind and the radio wind in RQ AGN are related to a radiation pressure driven wind. Evidence for free-free absorption by AGN photoionized gas, which flattens the spectral slope, is found in two objects. Radio outflows in three low L/L_Edd (0.05-0.12) objects are likely from a low-power jet, as suggested by additional evidence. The presence of a mild equatorial BLR wind in four intermediate L/L_Edd (0.2-0.4) objects can be tested with future spectropolarimetry. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_15934 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Windy or not: Radio pc-scale evidence for a broad-line region wind in radio-quiet quasars Chen, Sina Laor, Ari Behar, Ehud Baldi, Ranieri D. Gelfand, Joseph D. Kimball, Amy E. McHardy, Ian M. Orosz, Gabor Paragi, Zsolt Astrophysics of Galaxies Does a broad-line region (BLR) wind in radio-quiet (RQ) active galactic nuclei (AGN) extend to pc scales and produce radio emission? We explore the correlations between a pc-scale radio wind and the BLR wind in a sample of 19 RQ Palomar-Green (PG) quasars. The radio wind is defined based on the spectral slope and the compactness of the emission at 1.5-5 GHz, and the BLR wind is defined by the excess blue wing in the C IV emission line profile. The five objects with both radio and BLR wind indicators are found at high Eddington ratios L/L_Edd (> 0.66), and eight of the nine objects with neither radio nor BLR winds reside at low L/L_Edd (< 0.28). This suggests that the BLR wind and the radio wind in RQ AGN are related to a radiation pressure driven wind. Evidence for free-free absorption by AGN photoionized gas, which flattens the spectral slope, is found in two objects. Radio outflows in three low L/L_Edd (0.05-0.12) objects are likely from a low-power jet, as suggested by additional evidence. The presence of a mild equatorial BLR wind in four intermediate L/L_Edd (0.2-0.4) objects can be tested with future spectropolarimetry. |
| title | Windy or not: Radio pc-scale evidence for a broad-line region wind in radio-quiet quasars |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2408.15934 |