Asymmetric emission of the [OIII]<i>λ</i>5007 profile in narrow-line Seyfert 1 galaxies

Schmidt, E. O.; Oío, G. A.; Ferreiro, D. L.; Vega, L. R.; Weidmann, W. A.

doi:10.1051/0004-6361/201731557

Cited by 32 publications

(52 citation statements)

References 64 publications

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“…a wing component with FWHM of ∼500 km s −1 −1500 km s −1 ). The blue-shifted [O III] broad-line component is thought to originate from outflows and strong winds near the AGN (Heckman et al 1981;Whittle et al 1988;Véron-Cetty et al 2001;Bian et al 2005;Komossa et al 2008;Crenshaw et al 2010;Cracco et al 2016;Schmidt et al 2018). We performed spectral decomposition again with this broad-line component (green color), present the results in the third panels in Fig.…”

Section: Spectral Decomposition Of Known Dagns and Dagn Candidatesmentioning

confidence: 99%

Dual AGN Candidates with Double-peaked [O iii] Lines Matching that of Confirmed Dual AGNs

Kim

Yoon

Evans

et al. 2020

ApJ

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We have performed a spectral decomposition to search for dual active galactic nuclei (DAGNs) in the Sloan Digital Sky Survey (SDSS) quasars with z < 0.25. Potential DAGN candidates are searched by referencing velocity offsets and spectral shapes of double-peaked [O III] lines of known DAGNs. Out of 1271 SDSS quasars, we have identified 77 DAGN candidates. Optical and mid-infrared diagnostic diagrams are used to investigate the ionizing source in the DAGN candidates. The optical diagnostic analysis suggests 93% of them are powered by AGNs, and mid-infrared diagnostic analysis suggests 97% are powered by AGNs. About 1/3 of the SDSS images of the DAGN candidates show signs of tidal interaction, but we are unable to identify double nuclei in most of them due to the low spatial resolution of the archival imaging data available for most of the sample. The radio-loud fraction of the DAGN candidates (∼10%) is similar to that of typical AGNs.

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Section: Spectral Decomposition Of Known Dagns and Dagn Candidatesmentioning

confidence: 99%

Dual AGN Candidates with Double-peaked [O iii] Lines Matching that of Confirmed Dual AGNs

Kim

Yoon

Evans

et al. 2020

ApJ

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“…It is suggested that the blue-shifted [O III]5007Å line is mainly related to nuclear outflows and strong winds [21,22,20]. The shocks produced from AGN can act as a source of excitation which leads to nuclear photoionization.…”

Section: Pos(heasa2019)031mentioning

confidence: 99%

Analysis of optical Fe II emission with the X-ray properties of a selected sample of I Zw 1 type objects

Paul¹,

Winkler²,

Potter³

2020

Proceedings of 7th Annual Conference on High Energy Astrophysics in Southern Africa — PoS(HEASA2019)

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We report the analysis of medium resolution optical spectra of I Zwicky 1 type objects observed with the 1.9 m telescope at South African Astronomical Observatory (SAAO) at Sutherland. Fourteen bright objects were observed in the southern hemisphere during at least two epochs in the two year period from December 2016 to December 2018. We present our analysis of changes in line strength and profile of three objects, Mkn 1044, 1H 0707-495 and IRAS 03450+0055. Spectra of high signal-to-noise ratio are achieved by combining between 4 and 10 spectra for each epoch. This enables us to decompose and identify the weak individual lines of Fe II and other emissions. To confirm the nature and extent of spectral changes, we compare these combined spectra between the epochs. Mkn 1044 and IRAS 03450+0055 show extended [O III]5007 blue wings with a line width of around 1000 km/s. Both [O III] blue wing and Hβ ILR components match the Fe II profiles, suggesting that they all originate in the same region. No dramatic flux variations are found in Hβ (<10%), Fe II bands (<18%, with majority of the Fe II bands varying less than 4%), and in X-rays (<34% for 1H 0707-495, and <60% for Mkn 1044 between adjacent epochs). The minimum variability found in Fe II lines may imply that the origin of Fe II lines is far from the accretion disk.

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“…Chen et al ( 2018) 1 (hereafter C18) classified 167 southern hemisphere galaxies as NLSy1s from the Six-degree Field Galaxy Survey (6dFGS) final data release (DR3) (Jones et al 2004(Jones et al , 2009 2 ; they derived flux-calibrated spectra and found strong correlations between the monochromatic luminosity at 5100 Å and the luminosities of H β and [O iii]λ5007 lines, with typical SMBH masses (10 6 -10 8 M ) and high Eddington ratios (a median of 0.96) for the AGN class. The survey of Schmidt et al (2018) 3 (hereafter S18) (28 galaxies) was focused on [O iii]λ5007 line profile asymmetries associated with outflows, confirming the correlation between the blueshift and FWHM of the line core, between the outflow velocity and the black hole mass and with the width of the broad component of H β. Removing objects common to the two catalogs gave a target list of 189 galaxies with declination < 10 • .…”

Section: Sample Selectionmentioning

confidence: 81%

“…We have presented a near-infrared spectroscopic survey (using the SOFI instrument on the ESO-NTT telescope) of narrow-line Seyfert 1 galaxies in the southern hemisphere. These have been sampled from the optical surveys of Chen et al ( 2018) and Schmidt et al (2018). We have examined the kinematics of the broad-line region, probed by the emission line width of hydrogen (Pa α and H β).…”

Section: Discussionmentioning

confidence: 99%

The Southern Hemisphere Narrow-Line Seyfert 1 Infrared Survey

Durré,

Mould

2021

Preprint

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We present a near-infrared spectroscopic survey of narrow-line Seyfert 1 galaxies in the southern hemisphere (using the SOFI instrument on the ESO-NTT telescope), sampled from optical surveys. We examine the kinematics of the broad-line region, probed by the emission line width of hydrogen (Pa α and H β). We observed 57 objects, of which we could firmly measure Pa α in 49 cases. We find that a single Lorentzian fit (preferred on theoretical grounds) is preferred over multi-component Gaussian fits to the line profiles; a lack of narrow-line region emission, overwhelmed by the pole-on view of the broad line region (BLR) light, supports this. We recompute the catalog black hole (BH) mass estimates, using the values of FWHM and luminosity of H β, both from catalog values and re-fitted Lorentzian values. We find a relationship slope greater than unity compared to the catalog values. We ascribe this to contamination by galactic light or difficulties with line flux measurements. However, the comparison of masses computed by the fitted Lorentzian and Gaussian measurements show a slope close to unity. Comparing the BH masses estimated from both Pa αand H β, the line widths and fluxes shows deviations from expected; in general, however, the computed BH masses are comparable. We posit a scenario where an intermixture of dusty and dust-free clouds (or alternately a structured atmosphere) differentially absorbs the line radiation of the BLR, due to dust absorption and hydrogen bound-free absorption.

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Asymmetric emission of the [OIII]λ5007 profile in narrow-line Seyfert 1 galaxies

Cited by 32 publications

References 64 publications

Dual AGN Candidates with Double-peaked [O iii] Lines Matching that of Confirmed Dual AGNs

Dual AGN Candidates with Double-peaked [O iii] Lines Matching that of Confirmed Dual AGNs

Analysis of optical Fe II emission with the X-ray properties of a selected sample of I Zw 1 type objects

The Southern Hemisphere Narrow-Line Seyfert 1 Infrared Survey

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