English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present a comprehensive analysis of 20 years worth of multi-colorphotometric light curves, multi-epoch optical spectra, and X-ray data of anoff-nuclear variable object SDSS1133 in Mrk 177 at $z=0.0079$. The UV-opticallight curves reveal that SDSS1133 experienced four outbursts in 2001, 2014,2019, and 2021. The persistent UV-optical luminosity in the non-outburstingstate is $\sim 10^{41}$ erg/s with small-scale flux variations, and peakluminosities during the outbursts reach $\sim 10^{42}$ erg/s. The opticalspectra exhibit enduring broad hydrogen Balmer P-Cygni profiles with theabsorption minimum at $\sim -2,000$ km/s, indicating the presence of fastmoving ejecta. {\it Chandra} detected weak X-ray emission at a $0.3-10$ keVluminosity of $L_{X} = 4 \times 10^{38}$ erg/s after the 2019 outburst. Theselines of evidence suggests that SDSS1133 is an extreme luminous blue variable(LBV) star experiencing multiple giant eruptions with interactions of theejected shell with different shells and/or circumstellar medium (CSM), anddisfavors the recoiling Active Galactic Nuclei (AGN) scenario suggested in theliterature. We suggest that pulsational pair-instability may provide a viableexplanation for the multiple energetic eruptions in SDSS1133. If the currentactivity of SDSS1133 is a precursor of a supernova explosion, we may be able toobserve a few additional giant eruptions and then the terminal supernovaexplosion or collapse to a massive black hole in future observations.

Multiple giant eruptions and X-ray emission in the recoiling AGN/LBV candidate SDSS1133