Bernardita Ried Guachalla

Imprints of Large-Scale Structures in the Anisotropies of the Cosmological Gravitational Wave Background We compute the cross-correlation between the anisotropies of the cosmological gravitational wave background (CGWB) and the galaxy density contrast. We show that the cross-correlation is non-zero due t...

From last week arXiv!
Check our new paper (with @rafalafelo.bsky.social) on how Cosmological Gravitational Waves could correlate with Large-Scale Structures, and its potential synergies with Primordial non-Gaussianity.

arxiv.org/abs/2505.15084

My photographic work is now on display at Stanford University, in the Kavli Institute for Particle Astrophysics and Cosmology 😍

También se puede tener un evento en español y en Chile 😄! Solo revisar el link y cambiar a español :)

En Chile, ahora la cámara del Observatorio Verá Rubin abrió sus ojos. Es un momento histórico

Is the sigma-8 tension being sheared away? Cosmology with weak lensing from KiDS Today's bite looks at the final data release from the Kilo-Degree Survey, reporting a measurement of the clumpiness of the Universe as measured by weak gravitational lensing.

From Abbé Whitford: Today’s bite looks at the final data release from the Kilo-Degree Survey, reporting a measurement of the clumpiness of the Universe as measured by weak gravitational lensing. 🔭✨☄️
astrobites.org/2025/04/03/sigma8-tension-kids-legacy-galaxyshear/

Backlighting extended gas halos around luminous red galaxies: kinematic Sunyaev-Zel'dovich effect from DESI Y1 x ACT The gas density profile around galaxies, shaped by feedback and affecting the galaxy lensing signal, is imprinted on the cosmic microwave background (CMB) by the kinematic Sunyaev-Zel'dovich effect (k...

Come and check our most recent paper on measuring the kinematic Sunyaev-Zel'dovich effect using @desisurvey.bsky.social luminous red galaxies and the latest dataset from @act-pol.bsky.social 😍

arxiv.org/abs/2503.19870

¡La carta está siendo informada por los medios de comunicación chilenos!

La carta: drive.google.com/file/d/1HzgJ...

Entre los firmantes, el premio nobel de física Michael Mayor, junto a más de 700 académicos, 1400 investigadores y 800 estudiantes

Carta de miles de astrónomos de todo el mundo solicitándole a las autoridades chilenas que se protejan los cielos de Chile y su legado astronómico.

¡Orgullo Chileno! 🇨🇱

Grande Enrique Paillas 💪

¡La nueva página del Observatorio Simons ya está disponible! Por ahora solo en inglés, pronto viene la versión en castellano. ¿Qué les parece? ¡Déjennos sus comentarios!

simonsobservatory.org/institutions/

The current situation for international Fulbrighters right now. This is an amazing program that has enabled significant advancements in astronomy in both Chile and the US. I hope they don't end it 🙏

A map of the globe with bands indicating where the lunar eclipse will be visible. It's a total eclipse across North And South America and some of Western Europe.

A map of the globe with bands marking where the solar eclipse will be visit. It's a partial eclipse everywhere, with the most of the Sun obscured in eastern Canada and Greenland. Scandinavia, the UK and Western Europe will see about a third of the Sun obscured.

Eclipse preppers assemble! It's time to buy some solar eclipse glasses and set notifications in your diary.

🗓️13/14 Mar: Lunar Eclipse
🗓️29 Mar: Partial Solar Eclipse

Time/spectacle depends on your location 🔭🧪

↙️Lunar: www.timeanddate.com/eclipse/luna...
↘️Solar: www.timeanddate.com/eclipse/sola...

Please let me know which ones I missed! :)

10. Universidad Diego Portales: At the Instituto de Estudios Astrofísicos, they focus on observational astronomy at different wavelengths and have a diverse, international community.

astronomia.udp.cl/en/

9. Catholic University of the North: The astronomy institute specializes in galactic astronomy and astronomical instrumentation, with research focusing on galactic archaeology, exoplanets, the interstellar medium, and stellar surface imaging.

www.iaucn.cl

8. Catholic University of Valparaíso: The Astrophysics Group focuses on various areas of extragalactic astrophysics, utilizing multi-wavelength observations and international observatories in Chile and space-based instruments to enhance understanding of the universe.

fis.ucv.cl/astro/

astrounab

7. Andrés Bello University: It provides various programs in astronomy, supported by a team of academics and postdoctoral researchers focusing on stellar and extragalactic astronomy. It is located in many cities across the country.

astrounab.cl

6. University of Santiago: is one of the leading public universities in Chile, with a strong reputation in various fields. It offers a solid program of astronomy, particularly through its Department of Physics.

fisica.usach.cl/en/astrophys...

5. University of Antofagasta: It offers a Master's program in Astronomy through its Center for Research, Technology, Education, and Astronomical Outreach (CITEVA), featuring observatories like Ckoirama.

www.uantof.cl/centros/cite...

4. University of La Serena: This university is the closest to Las Campanas, CTIO and the Rubin Observatory. It is near the AURA facility and frequently exchanges with astronomers visiting to observe at the AURA facilities and the Carnegie Institution for Science

fciencias.userena.cl/tag/astronom...

3. University of Concepción: Located in the city of Concepción, it has a strong emphasis on scientific research, particularly in the fields of astronomy and astrophysics. The university is known for its collaboration with national and international institutions.

www.astro.udec.cl/e/index-es.h...

2. Pontifical Catholic University of Chile: This university's Institute of Astrophysics offers advanced research opportunities and hosts several astronomical observatories, including the Manuel Foster Observatory.

astro.uc.cl

1. University of Chile: Established in 1842, it is the country's oldest and largest university. Its Department of Astronomy (DAS) provides comprehensive undergraduate and graduate programs and operates the National Astronomical Observatory.

das.uchile.cl

Regarding the cuts to the science budget in the US, I wanted to highlight Chilean universities that offer graduate studies in astronomy. Because Chile will host 60% of the world’s ground-based telescopes by the end of the decade, they are leading many important research projects.

Starting a 🧵:

Mapa del cielo mostrando el área que observará el Observatorio Simons en comparación a DES, DESI, Euclid y Rubin.

Hoy publicamos dos artículos en el repositorio #arXiv. En el primero de ellos (arxiv.org/abs/2503.00636) discutimos los principales objetivos científicos de nuestro LAT (recuerden: Large Aperture Telescope, Telescopio de Gran Apertura), que observará la mitad del cielo

A spiral galaxy seen close up and almost face on. It is filled with puffy, patchy clouds of hot gas and dust. Red, orange and yellow colours indicate light emitted by different particles. The brightest colours are in the centre and along the two spiral arms, which wind out from the centre. Star clusters hide in the gas along the arms. A few large, bright white stars are prominent in the foreground, near to us.

New JWST image dropped: NGC 2283.
ESA chose this spiral galaxy to be Picture Of The Month (POTM) for February 2025.

ESA/Webb, NASA & CSA, A. Leroy
esawebb.org/images/potm2...

Los amigos de @almaobservatory.bsky.social me enviaron este regalo, el que justo llegó unos días antes de mi cumpleaños 😍

Para los que no saben, ALMA es uno de los radiotelescopios más importantes del mundo, y ¡está en Chile! 🇨🇱🌟

Ojalá pronto pueda visitarlos 🌌

I was not expecting this paper today when I was reading the ArXiv 😮