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Statistical analysis of Al III and C III] emission lines as virial black hole mass estimators in quasars

Buendia-Rios, T. M. ; Negrete, C. A. ; Marziani, P. ; Dultzin, D.

Astronomy and astrophysics (Berlin), 2023-01, Vol.669, p.A135 [Periódico revisado por pares]

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  • Título:
    Statistical analysis of Al III and C III] emission lines as virial black hole mass estimators in quasars
  • Autor: Buendia-Rios, T. M. ; Negrete, C. A. ; Marziani, P. ; Dultzin, D.
  • É parte de: Astronomy and astrophysics (Berlin), 2023-01, Vol.669, p.A135
  • Descrição: Aims. We test the usefulness of the intermediate ionisation lines Al  III λ 1860 and C  III ] λ 1909 as reliable virial mass estimators for quasars. Methods. We identified a sample of 309 quasars from the Sloan Digital Sky Survey Data Release 16 (SDSS DR16) in the redshift range 1.2 ≤  z  ≤ 1.4 that have [O  II ] λ 3728 recorded on the same spectrum as Al  III λ 1860, Si  III ] λ 1892, and C  III ] λ 1909. We set the systemic quasar redshift using careful measurements of [O  II ] λ 3728. We then classified the sources as Population A (Pop. A), extreme Population A (Pop. xA), and Population B (Pop. B), and analysed the 1900 Å blend using multi-component models to look for systematic line shifts of Al  III λ 1860 and C  III ] λ 1909 along the quasar main sequence. Results. We do not find significant shifts of the Al  III λ 1860 line peak in Pop. B or in the vast majority of Pop. A. For Pop. xA, a small median blueshift of −250 km s −1 was observed, motivating a decomposition of the Al  III line profile into a virialised component centred at rest frame and a blueshifted component for an outflow emission. For Pop. B objects, we proved the empirical necessity to fit a redshifted very broad component, clearly seen in C  III ], and analysed the physical implications on a Pop. B composite spectrum using CLOUDY simulations. We find consistent black hole mass estimations using Al  III and C  III ] as virial estimators for the bulk of Pop. A. Conclusions. Al  III (and even C  III ]) is a reliable virial black hole mass estimator for Pop. A and Pop. B objects. The Pop. xA sources deserve special attention due to the significant blueshifted excess observed in the line profile of Al  III , although it is not as large as the excess observed in C  IV λ 1549.
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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