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The Galaxy Zoo survey for giant AGN-ionized clouds: past and present black-hole accretion events

Abstract:

Some active galactic nuclei (AGN) are surrounded by extended emission-line regions (EELRs), which trace both the illumination pattern of escaping radiation and its history over the light-travel time from the AGN to the gas. From a new set of such EELRs, we present evidence that the AGN in many Seyfert galaxies undergo luminous episodes 20,000-200,000 years in duration. Motivated by the discovery of the spectacular nebula known as Hanny's Voorwerp, ionized by a powerful AGN which has apparentl...

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Publication status:
Published

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Journal:
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume:
420
Issue:
1
Pages:
878-900
Publication date:
2011-10-31
DOI:
EISSN:
1365-2966
ISSN:
0035-8711
URN:
uuid:f95cabc1-243a-4e02-958a-94fc99f2c64d
Source identifiers:
204324
Local pid:
pubs:204324
Keywords:

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