Wind-luminosity evolution in NLS1 AGN 1H 0707−495

Abstract

Ultrafast outflows (UFOs) have been detected in the high-quality X-ray spectra of a number of active galactic nuclei (AGNs) with fairly high accretion rates and are thought to significantly contribute to the AGN feedback. After a decade of dedicated study, their launching mechanisms and structure are still not well understood, but variability techniques may provide useful constraints. In this work therefore we perform a flux-resolved X-ray spectroscopy on a highly accreting and variable NLS1 AGN, 1H 0707−495, using all archival XMM–Newton observations to study the structure of the UFO. We find that the wind spectral lines weaken at higher luminosities, most likely due to an increasing ionization parameter as previously found in a few similar sources. Instead, the velocity is anticorrelated with the luminosity, which is opposite to the trend observed in the NLS1 IRAS 13224−3809. Furthermore, the detection of the emission lines, which are not observed in IRAS 13224−3809, indicates a wind with a larger opening angle in 1H 0707−495, presumably due to a higher accretion rate. The emitting gas is found to remain broadly constant with the luminosity. We describe the variability of the wind with a scenario where the strong radiation extends the launch radius outwards and shields the outer emitting gas, similarly to super-Eddington compact objects, although other possible explanations are discussed. Our work provides several hints for a multiphase outflow in 1H 0707−495.

Ejection–accretion connection in NLS1 AGN 1H 1934-063

“…To locate the global best-fitting solution, we build a systematic scan o v er a large grid of the parameter space before directly fitting to the spectra (e.g. Kosec et al 2020 ;Xu et al 2021a ). We create a multidimension grid of the log ξ (0-6 with log ξ = 0.12) and z LOS (from −0.25 to 0.02 with z LOS = 0.001), and allow N H to be free.…”

“…MNRAS 513, 1910-1924 (2022) Previous works have shown that UFOs can have some degree of variability and that their properties seem to be affected by variations in the source X-ray luminosity, at least in three sources for which a large amount of data was available: PDS 456 (Matzeu et al 2017 ), IRAS 13224-3809 (Parker et al 2017b ;Pinto et al 2018 ), and 1H 0707-495 (Xu et al 2021a ). The wind structure determined by the acceleration mechanism has also been suggested to play a role for the UFO variability recently (e.g.…”

Detection of an Unidentified Soft X-ray Emission Feature in NGC 5548

“…In their Figure 2, a broad emission feature is seen at restframe 18.6 Å, which has been interpreted as a blueshifted component of O viii line. Deeper XMM-Newton data of 1H0707−495 reveal that the emitting gas has a radial velocity of about 8000 km s −1 , and a velocity dispersion of 3000 − 6000 km s −1 (Kosec et al 2018a;Xu et al 2021). Similar blueshifted emission features are found at the wavelengths of N vii, Fe xvii, Ne x, S xvi, and Fe xxv/Fe xxvi.…”

Ejection-accretion connection in NLS1 AGN 1H 1934-063

“…NLS1 AGN host low-mass, high-accretion-rate SMBHs with a strong radiation field, which is therefore expected to be a dominant driving force for UFOs (see review by Komossa 2007). Previous works have shown that UFOs can have some degree of variability and that their properties seem to be affected by variations in the source Xray luminosity, at least in three sources for which a large amount of data was available: PDS 456 (Matzeu et al 2017), IRAS 13224-3809 (Parker et al 2017b;Pinto et al 2018) and 1H 0707-495 (Xu et al 2021a). The wind structure determined by the acceleration mechanism, has also been suggested to play a role for the UFO variability recently (e.g.…”

“…To locate the global best-fit solution, we build a systematic scan over a large grid of the parameter space before directly fitting to the spectra (e.g. Kosec et al 2020;Xu et al 2021a). We create a multi-dimension grid of the log (0-6 with Δ log = 0.12) and LOS (from −0.25 to 0.02 with Δ LOS = 0.001), and allow H to be free.…”