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PreprintCC BY 4.0arXiv

Constraining the timescale of activity in Mrk 1018

  • Rebecca McElroy
  • Scott M. Croom
  • Thomas Dunn
Open at sourcePDFDOICite

Abstract

We present analysis of an extended emission line region projected 3.77 kpc from the nucleus of the canonical changing-look AGN Mrk~1018, found in MUSE integral-field observations from the Close AGN Reference Survey. Emission-line ratios show that the region exhibits AGN ionisation but has a very low velocity dispersion, 77 ± 1 kms−1, ruling out an ionised outflow. The lower limit on the light travel time is 12,300 ± 2,300 yr, implying that the nucleus has therefore been active for at least this long. This is much longer than the duration of either observed changing-look transition, which occurred over several years. This implies that Mrk 1018's multi-year variations are occurring within a longer term active phase.

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Cite

BibTeXRIS
BibTeX
@misc{mcelroy2026constraining,
  title = {{Constraining the timescale of activity in Mrk 1018}},
  author = {Rebecca McElroy and Scott M. Croom and Thomas Dunn},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.07533},
  eprint = {2611.07533},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.07533},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Constraining the timescale of activity in Mrk 1018
AU  - Rebecca McElroy
AU  - Scott M. Croom
AU  - Thomas Dunn
PY  - 2026
DA  - 2026/11/05
PB  - arXiv
DO  - 10.48550/arxiv.2611.07533
UR  - https://arxiv.org/abs/2611.07533
AB  - We present analysis of an extended emission line region projected 3.77 kpc from the nucleus of the canonical changing-look AGN Mrk~1018, found in MUSE integral-field observations from the Close AGN Reference Survey. Emission-line ratios show that the region exhibits AGN ionisation but has a very low velocity dispersion, 77 ± 1 kms^−1, ruling out an ionised outflow. The lower limit on the light travel time is 12,300 ± 2,300 yr, implying that the nucleus has therefore been active for at least this long. This is much longer than the duration of either observed changing-look transition, which occurred over several years. This implies that Mrk 1018's multi-year variations are occurring within a longer term active phase.
ER  -