Gertie Geertsema

Full-polarization millimeter wavelength variability of Sagittarius A* during the 2018 EHT campaign

Ezequiel Albentosa-Ruíz, Jasmin E. Washington, Nicola Marchili, Iván Martí-Vidal et autres

Sagittarius A* (Srg A*), the supermassive black hole at the center of the Milky Way, provides a unique laboratory to study accretion dynamics and plasma processes near the event horizon. We investigated the variability and polarization properties of Srg A* using ALMA …

Full-polarization millimeter wavelength variability of Sagittarius A

Ezequiel Albentosa-Ruíz, Jasmin E. Washington, Nicola Marchili, I. Martí‐Vidal et autres

Context. Sagittarius A* (Sgr A*), the supermassive black hole at the center of the Milky Way, provides a unique laboratory to study accretion dynamics and plasma processes near the event horizon. Aims. We investigated the variability and polarization properties of Sgr A* …

Spatially resolved polarization swings in the supermassive binary black hole candidate OJ 287 with first Event Horizon Telescope observations

José L. Gómez, Ilje Cho, Efthalia Traianou, Thomas P. Krichbaum et autres

We present the first Event Horizon Telescope 1.3 mm observations of the supermassive binary black hole candidate OJ 287. The observations achieved an unprecedented angular resolution of 18 μas and reveal significant structural and polarization variability over just five days, marking the …

Full-polarization millimeter wavelength variability of Sagittarius A * during the 2018 EHT campaign

Ezequiel Albentosa-Ruíz, E. Washington, N. Marchili, Iván Martí-Vidal et autres

Context. Sagittarius A* (Sgr A * ), the supermassive black hole at the center of the Milky Way, provides a unique laboratory to study accretion dynamics and plasma processes near the event horizon. Aims. We investigated the variability and polarization properties of …

es, us, it, de, rs, cu, sk, nl, jp, ca, my, au, tw, se, cl, fr, cn, kr, mx, Afrique du Sud, dk, gt (code pays fourni par la source)

Spatially resolved polarization swings in the supermassive binary black hole candidate OJ 287 with first Event Horizon Telescope observations

José L. Gómez, Ilje Cho, Efthalia Traianou, P. Thomas Krichbaum et autres

We present the first Event Horizon Telescope 1.3 mm observations of the supermassive binary black hole candidate OJ 287. The observations achieved an unprecedented angular resolution of 18 μas and reveal significant structural and polarization variability over just five days, marking the …

es, kr, de, it, us, jp, dk, in, fi, my, au, tw, se, cl, fr, ca, nl, br, cu, cn, mx, Afrique du Sud, gt (code pays fourni par la source)

Horizon-scale variability of M87* from 2017–2021 EHT observations

Kazunori Akiyama, Ezequiel Albentosa-Ruíz, A. Alberdi, Walter Alef et autres

We report three epochs of polarized images of M87* at 230 GHz using data from the Event Horizon Telescope (EHT) taken in 2017, 2018, and 2021. The baseline coverage of the 2021 observations is significantly improved through the addition of two new …

us, jp, es, de, my, au, tw, rs, se, cl, fr, ca, nl, br, cu, cn, kr, mx, it, Afrique du Sud, dk, gt, sk (code pays fourni par la source)

Origin of the ring ellipticity in the black hole images of M87 *

Rohan Dahale, Ilje Cho, Kotaro Moriyama, K. Wiik et autres

We investigate the origin of the elliptical ring structure observed in the images of the supermassive black hole M87 * , aiming to disentangle contributions from gravitational, astrophysical, and imaging effects. Leveraging the enhanced capabilities of the Event Horizon Telescope (EHT)'s 2018 …

es, kr, jp, fi, us, dk, de, tw, mx, ca, nl, fr, my, se, cl, br, cn, it, Afrique du Sud (code pays fourni par la source)

The Added Value of Statistical Seasonal Forecasts

Folmer Krikken, Gertie Geertsema, Kristian Fog Nielsen, Alberto Troccoli

Seasonal climate predictions can assist with timely preparations for extreme episodes, such as dry or wet periods that have associated additional risks of droughts, fires and challenges for water management. Timely warnings for extreme warm summers or cold winters can aid in …

nl, gb (code pays fourni par la source)

The Value-Add of Tailored Seasonal Forecast Information for Industry Decision Making

C. M. Goodess, Alberto Troccoli, Nicholas Vasilakos, Stephen Dorling et autres

There is a growing need for more systematic, robust, and comprehensive information on the value-add of climate services from both the demand and supply sides. There is a shortage of published value-add assessments that focus on the decision-making context, involve participatory or …

gb, it, nl (code pays fourni par la source)

First Sagittarius A* Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole in the Center of the Milky Way

Kazunori Akiyama, A. Alberdi, W. Alef, Juan Carlos Algaba et autres

Abstract We present the first Event Horizon Telescope (EHT) observations of Sagittarius A* (Sgr A*), the Galactic center source associated with a supermassive black hole. These observations were conducted in 2017 using a global interferometric array of eight telescopes operating at a …

us, jp, es, de, my, tw, ca, fr, nl, kr, se, it, Afrique du Sud, cn, dk, mx (code pays fourni par la source)

First Sagittarius A* Event Horizon Telescope Results. II. EHT and Multiwavelength Observations, Data Processing, and Calibration

Kazunori Akiyama, A. Alberdi, W. Alef, Juan Carlos Algaba et autres

Abstract We present Event Horizon Telescope (EHT) 1.3 mm measurements of the radio source located at the position of the supermassive black hole Sagittarius A* (Sgr A*), collected during the 2017 April 5–11 campaign. The observations were carried out with eight facilities …

us, jp, es, de, my, tw, ca, fr, nl, kr, se, it, Afrique du Sud, cn, dk, mx (code pays fourni par la source)

Anticipated Verification: A Simple Method for Representing Confidence and Trust in Metocean Forecast Information to Effectively Enhance Operational Decision-Making

Edward C. C. Steele, Kenneth R. Mylne, Robert A. Neal, Jessica Standen et autres

Abstract It is easy to look back at a past forecast and assess how well it performed relative to the observed weather, but it is an obvious fact that such verification is only possible after the event has passed. Despite advances in …

gb, nl, jp (code pays fourni par la source)