YouTube video by ЗНАЮ ВСЁ

Scot is co-founder and Co-Director of the 22nd Century Initiative (22CI), a national strategy and action center that is building a movement to resist authoritarianism and preserve the possibility of a...

Scot is co-founder and Co-Director of the 22nd Century Initiative (22CI), a national strategy and action center that is building a movement to resist authoritarianism and preserve the possibility of a...

YouTube video by Cevheri Güven

YouTube video by CBC News

神奈川県横須賀市は、8月20日に開催する、全国の高校生を対象にしたeスポーツ大会「YOKOSUKA e-Sports CUP」第6回大会の参加者の募集を5月20日から開始した。応募 […]

We present observations of ASASSN-22ci (AT2022dbl), a nearby tidal disruption event (TDE) discovered by the All-Sky Automated Survey for Supernovae (ASAS-SN) at a distance of d$_L \simeq 125$ Mpc. Roughly two years after the initial ASAS-SN discovery, a second flare was detected coincident with ASASSN-22ci. UV/optical photometry and optical spectroscopy indicate that both flares are likely powered by TDEs. The striking similarity in flare properties suggests that these flares result from subsequent disruptions of the same star. Each flare rises on a timescale of $\sim$30 days, has a temperature of $\approx$30,000 K, a peak bolometric luminosity of $L_{UV/Opt} = 10^{43.6 - 43.9} \textrm{ erg} \textrm{ s}^{-1}$, and exhibits a blue optical spectrum with broad H, He, and N lines. No X-ray emission is detected during either flare, but X-ray emission with an unabsorbed luminosity of $L_{X} = 3\times10^{41} \textrm{ erg} \textrm{ s}^{-1}$ and $kT = 0.042$ eV is observed between the flares. Pre-discovery survey observations rule out the existence of earlier flares within the past $\approx$6000 days, indicating that the discovery of ASASSN-22ci likely coincides with the first flare. If the observed flare separation of $720 \pm 4.7$ days is the orbital period, the next flare of ASASSN-22ci should occur near MJD 61075 (2026 February 04). Finally, we find that the existing sample of repeating TDE candidates is consistent with Hills capture of a star initially in a binary with a total mass between $\sim$$1 - 4$ M$_{\odot}$ and a separation of $\sim$$0.01 - 0.1$ AU.

Astronomers recently observed a rare cosmic event where a supermassive black hole, located approximately 408 million light-years away, consumed one star from a binary system while the other narrowly escaped. This unusual phenomenon, known as a double-flash tidal disruption event (TDE), occurred in the galaxy WISEA J122045.05+493304.7. These powerful events, visible from billions of light-years away, typically involve a single flare, but the designated event ASASSN-22ci is notable for producing two flares, sparking interest in its origins and implications for black hole research. A Unique Event Observed According to a…

🎤 We’re thrilled to welcome Scot Nakagawa to NWJP’s Celebration of Worker Justice! Scot is a political strategist and organizer with over four decades of experience exploring questions of structural…

Block, Bridge, & Build: Playbook for an Inclusive Multi-racial Democracy is a compilation of tools and frameworks for pro-democracy organizations and the organizers, storytellers, and researchers on…

The Anti-Authoritarian Podcast is a platform to explore strategy questions with Scot Nakagawa, Sue Hyde, and pro-democracy leaders in the U.S. and globally for audiences interested in fighting…