Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 445, Issue 1, Pages 515-527Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu1673
Keywords
supernovae: general; galaxies: active; galaxies: dwarf
Categories
Funding
- Swiss National Science Foundation (SNSF) [PP00P2 138979/1]
- SNSF through the Ambizione fellowship
- National Aeronautics and Space Administration (NASA) issued by the Chandra X-ray Observatory Center [AR3-14010X]
- NASA [NAS8-03060, PF2-130093]
- Gary and Cynthia Bengier
- Christopher R. Redlich Fund
- Richard and Rhoda Goldman Fund
- TABASGO Foundation
- NSF [AST-1211916, AST-1238877]
- W. M. Keck Foundation
- Alfred P. Sloan Foundation
- NSF
- U.S. Department of Energy
- NASA
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- Max Planck Institute for Astronomy (Heidelberg)
- Max Planck Institute for Extraterrestrial Physics (Garching)
- Johns Hopkins University
- Durham University
- University of Edinburgh
- Queen's University Belfast
- Harvard-Smithsonian Center for Astrophysics
- Las Cumbres Observatory Global Telescope Network Incorporated
- National Central University of Taiwan
- Space Telescope Science Institute
- NASA issued through the Planetary Science Division of the NASA Science Mission Directorate [NNX08AR22G]
- University of Maryland
- Eotvos Lorand University (ELTE)
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1211916] Funding Source: National Science Foundation
Ask authors/readers for more resources
While performing a survey to detect recoiling supermassive black holes, we have identified an unusual source having a projected offset of 800 pc from a nearby dwarf galaxy. The object, SDSS J113323.97+550415.8, exhibits broad emission lines and strong variability. While originally classified as a supernova (SN) because of its non-detection in 2005, we detect it in recent and past observations over 63 yr and find over a magnitude of rebrightening in the last 2 yr. Using high-resolution adaptive optics observations, we constrain the source emission region to be less than or similar to 12 pc and find a disturbed host-galaxy morphology indicative of recent merger activity. Observations taken over more than a decade show narrow [O III] lines, constant ultraviolet emission, broad Balmer lines, a constant putative black hole mass over a decade of observations despite changes in the continuum, and optical emission-line diagnostics consistent with an active galactic nucleus (AGN). However, the optical spectra exhibit blueshifted absorption, and eventually narrow Fe II and [Ca II] emission, each of which is rarely found in AGN spectra. While this peculiar source displays many of the observational properties expected of a potential black hole recoil candidate, some of the properties could also be explained by a luminous blue variable star (LBV) erupting for decades since 1950, followed by a Type IIn SN in 2001. Interpreted as an LBV followed by an SN analogous to SN 2009ip, the multidecade LBV eruptions would be the longest ever observed, and the broad Ha emission would be the most luminous ever observed at late times (> 10 yr), larger than that of unusually luminous SNe such as SN 1988Z, suggesting one of the most extreme episodes of pre-SN mass-loss ever discovered.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available