SIMBAD references

2019MNRAS.488L...1B - Mon. Not. R. Astron. Soc., 488, L1-L5 (2019/September-1)

HST unveils a compact mildly relativistic broad-line region in the candidate true type 2 NGC 3147.

BIANCHI S., ANTONUCCI R., CAPETTI A., CHIABERGE M., LAOR A., BASSANI L., CARRERA F.J., LA FRANCA F., MARINUCCI A., MATT G., MIDDEI R. and PANESSA F.

Abstract (from CDS):

NGC 3147 has been considered the best case of a true type 2 AGN: an unobscured AGN, based on the unabsorbed compact X-ray continuum, which lacks a broad-line region (BLR). However, the very low luminosity of NGC 3147 implies a compact BLR, which produces very broad lines, hard to detect against the dominant background host galaxy. Narrow (0.1 arcsec x 0.1 arcsec) slit HST spectroscopy allowed us to exclude most of the host galaxy light, and revealed an H α line with an extremely broad base (FWZI∼27 000 km s–1). The line profile shows a steep cut-off blue wing and an extended red wing, which match the signature of a mildly relativistic thin accretion disc line profile. It is indeed well fit with a nearly face on thin disc, at i ∼ 23°, with an inner radius at 77 ± 15 rg, which matches the prediction of 62+18–14rg from the RBLR-L1/2 relation. This result questions the very existence of true type 2 AGN. Moreover, the detection of a thin disc, which extends below 100 rg in an L/LEdd ∼ 10–4 system, contradicts the current view of the accretion flow configuration at extremely low accretion rates.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): galaxies: active - galaxies: individual: NGC3147 - galaxies: Seyfert

Simbad objects: 4

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2021.06.12-17:01:34

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