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- W2149361469 endingPage "2349" @default.
- W2149361469 startingPage "2342" @default.
- W2149361469 abstract "SAGE1C J053634.78−722658.5 is a galaxy at redshift z = 0.14, discovered behind the Large Magellanic Cloud in the SpitzerSpace Telescope‘Surveying the Agents of Galaxy Evolution’ Spectroscopy survey. It has very strong silicate emission at 10 μm but negligible far-IR and UV emission. This makes it a candidate for a bare active galactic nuclei (AGN) source in the IR, perhaps seen pole-on, without significant IR emission from the host galaxy. In this paper we present optical spectra taken with the Southern African Large Telescope to investigate the nature of the underlying host galaxy and its AGN. We find broad H α emission characteristic of an AGN, plus absorption lines associated with a mature stellar population (>9 Gyr), and refine its redshift determination to z = 0.1428 ± 0.0001. There is no evidence for any emission lines associated with star formation. This remarkable object exemplifies the need for separating the emission from any AGN from that of the host galaxy when employing IR diagnostic diagrams. We estimate the black hole mass, MBH = 3.5 ± 0.8 × 108 M⊙, host galaxy mass, |$M_{rm stars}=2.5^{2.5}_{1.2}times 10^{10}$| M⊙, and accretion luminosity, Lbol(AGN) = 5.3 ± 0.4 × 1045 erg s−1 (≈12 per cent of the Eddington luminosity), and find the AGN to be more prominent than expected for a host galaxy of this modest size. The old age is in tension with the downsizing paradigm in which this galaxy would recently have transformed from a star-forming disc galaxy into an early-type, passively evolving galaxy." @default.
- W2149361469 created "2016-06-24" @default.
- W2149361469 creator A5037517484 @default.
- W2149361469 creator A5075451060 @default.
- W2149361469 date "2015-09-08" @default.
- W2149361469 modified "2023-09-26" @default.
- W2149361469 title "An evolutionary missing link? A modest-mass early-type galaxy hosting an oversized nuclear black hole" @default.
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