The Close AGN Reference Survey (CARS). Mrk 1018 halts dimming and experiences strong short-term variability
Letter
Krumpe, M., Husemann, B., Tremblay, G.R., Urrutia, T., Powell, M., Davis, T.A., Scharwächter, J., Dexter, J., Busch, G., Combes, F., Croom, S. M., Eckart, A., McElroy, R. E., Pérez-Torres, M. and Leung, G.. 2017. "The Close AGN Reference Survey (CARS). Mrk 1018 halts dimming and experiences strong short-term variability." Astronomy and Astrophysics: a European journal. 607. https://doi.org/10.1051/0004-6361/201731967
| Article Title | The Close AGN Reference Survey (CARS). Mrk 1018 halts dimming and experiences strong short-term variability |
|---|---|
| ERA Journal ID | 1050 |
| Article Category | Letter |
| Authors | Krumpe, M., Husemann, B., Tremblay, G.R., Urrutia, T., Powell, M., Davis, T.A., Scharwächter, J., Dexter, J., Busch, G., Combes, F., Croom, S. M., Eckart, A., McElroy, R. E., Pérez-Torres, M. and Leung, G. |
| Journal Title | Astronomy and Astrophysics: a European journal |
| Journal Citation | 607 |
| Article Number | L9 |
| Number of Pages | 4 |
| Year | 2017 |
| Publisher | EDP Sciences |
| Place of Publication | France |
| ISSN | 0004-6361 |
| 1432-0746 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1051/0004-6361/201731967 |
| Web Address (URL) | https://www.aanda.org/articles/aa/full_html/2017/11/aa31967-17/aa31967-17.html |
| Abstract | After changing optical AGN type from 1.9 to 1 in 1984, the AGN Mrk 1018 recently reverted back to its type 1.9 state. Our ongoing monitoring now reveals that the AGN has halted its dramatic dimming, reaching a minimum around October 2016. The minimum was followed by an outburst rising with 0.25 U-band mag/month. The rebrightening lasted at least until February 2017, as confirmed by joint Chandra and Hubble observations. Monitoring was resumed in July 2017 after the source emerged from sunblock, at which point the AGN was found only 0.4 mag brighter than its minimum. The intermittent outburst was accompanied by the appearance of a red wing asymmetry in broad-line shape, indicative of an inhomogeneous broad-line region. The current flickering brightness of Mrk 1018 following its rapid fading either suggests that the source has reignited, remains variable at a low level, or may continue dimming over the next few years. Distinguishing between these possibilities requires continuous multiwavelength monitoring. <P />Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme(s) 098.B-0672 and 099.B-0159. The scientific results reported in this article are based on observations made by the Chandra X-ray Observatory and the NASA/ESA Hubble Space Telescope. |
| Keywords | galaxies: evolution; quasars: individual: Mrk 1018; accretion, accretion disk |
| Contains Sensitive Content | Does not contain sensitive content |
| ANZSRC Field of Research 2020 | 510102. Astronomical instrumentation |
| Public Notes | Files associated with this item cannot be displayed due to copyright restrictions, but may be accessed online. Please see the link in the URL field. |
| Byline Affiliations | Leibniz Institute for Astrophysics Potsdam, Germany |
| Max Planck Institute for Astronomy, Germany | |
| Center for Astrophysics Harvard and Smithsonian, United States | |
| Yale University, United States | |
| Cardiff University, United Kingdom | |
| Gemini Observatory, United States | |
| Max Planck Institute for Extraterrestrial Physics, Germany | |
| University of Cologne, Germany | |
| Sorbonne University, France | |
| University of Sydney | |
| ARC Centre of Excellence for All Sky Astrophysics in 3 Dimensions, Australia | |
| Max Planck Institute for Radio Astronomy, Germany | |
| Institute of Astrophysics of Andalusia, Spain | |
| University of California San Diego, United States |
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