SkyMapper colours of Seyfert galaxies and changing-look AGN – II. Newly discovered changing-look AGN. Issue 1 (21st December 2021)
- Record Type:
- Journal Article
- Title:
- SkyMapper colours of Seyfert galaxies and changing-look AGN – II. Newly discovered changing-look AGN. Issue 1 (21st December 2021)
- Main Title:
- SkyMapper colours of Seyfert galaxies and changing-look AGN – II. Newly discovered changing-look AGN
- Authors:
- Hon, Wei Jeat
Wolf, Christian
Onken, Christopher A
Webster, Rachel
Auchettl, Katie - Abstract:
- ABSTRACT: Changing-look active galactic nuclei (CLAGN) are AGN that change type as their broad emission lines appear or disappear, which is usually accompanied by strong flux changes in their blue featureless continuum. We search for turn-on CLAGN by selecting type-2 AGN from the spectroscopic Six-degree Field Galaxy Survey (6dFGS), whose colours, observed ∼15 yr later by the SkyMapper Southern Survey, are suggestive of type-1 AGN. Starting from 1092 type-2 AGN, we select 20 candidates for follow-up and confirm that 14 of them have changed into type-1 and are thus turn-on CLAGN; further observations reveal 11 more turn-on CLAGN. While our search was not tailored to efficiently discover turn-off CLAGN, we discover two such cases as well. The result suggests a turn-on CLAGN rate of over 3 per cent over ∼15 yr and imply a total CLAGN rate of more than ∼6 per cent over this period. Finally, we present observations of AGN that are atypical for the CLAGN phenomenology, including J1109146 – a type-1 that did not appear as an AGN at all in 6dFGS; J1406507 – the second reported changing-look narrow-line Seyfert 1; and J1340153 – a CLAGN with a change time-scale of 3 months.
- Is Part Of:
- Monthly notices of the Royal Astronomical Society. Volume 511:Issue 1(2022)
- Journal:
- Monthly notices of the Royal Astronomical Society
- Issue:
- Volume 511:Issue 1(2022)
- Issue Display:
- Volume 511, Issue 1 (2022)
- Year:
- 2022
- Volume:
- 511
- Issue:
- 1
- Issue Sort Value:
- 2022-0511-0001-0000
- Page Start:
- 54
- Page End:
- 70
- Publication Date:
- 2021-12-21
- Subjects:
- galaxies: active -- quasars: emission lines -- quasars: general -- galaxies: Seyfert
Astronomy -- Periodicals
Periodicals
520.5 - Journal URLs:
- http://mnras.oxfordjournals.org/ ↗
http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1365-2966 ↗
http://www.blackwell-synergy.com/issuelist.asp?journal=mnr ↗
http://www.blackwell-synergy.com/loi/mnr ↗
http://ukcatalogue.oup.com/ ↗ - DOI:
- 10.1093/mnras/stab3694 ↗
- Languages:
- English
- ISSNs:
- 0035-8711
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - 5943.000000
British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 20696.xml