@pgperezgonzalez.bsky.social
¿Qué hemos necesitado para llegar a ser una civilización como la actual y qué ha influido en ello a nivel cósmico? Hoy en @elpais.com.
elpais.com/ciencia/vaci...
El dilema de qué va primero, el huevo o la gallina, versión cósmica, hoy en @elpais.com #Vacíocósmico
elpais.com/ciencia/vaci...
What can ELT add to what we are learning about galaxy evolution with JWST? Answering that question is one of our goals this week in Ringberg Castle during a workshop organized by @maxplanck.de
15.06.2025 19:50 — 👍 0 🔁 0 💬 0 📌 02000 años no son nada en astronomía. De Ptolomeo a
@nasawebb.extwitter.link pasando por Azarquiel, hoy en
@elpais.com.
elpais.com/ciencia/vaci...
La ciencia básica avanza poco a poco: un viaje en globo de tres animales que quizás acabaron en una gran cena desemboca en el descubrimiento de protones, electrones, partículas alpha,... que impactan e ionizan la atmósfera. Hoy en Materia de @elpais.com
elpais.com/ciencia/vaci...
Hoy en @elpais.com hablamos de “cambios de paradigma”. Quizás un buen día para hablar de un concepto como ese, me centro en paradigmas básicos de la humanidad.
03.04.2025 20:52 — 👍 0 🔁 0 💬 0 📌 0The project has been a roller coaster ride, with ups and downs, but collaborating with great people and all together (in Europe and the US) trying to learn more about the Universe. Thank you all for your great contributions!!
21.03.2025 12:49 — 👍 0 🔁 0 💬 0 📌 0
We find several candidates with very blue spectral energy distributions. Those would point to very young stars, maybe Pop III and/or with many very massive stars, and/or also with low escape fractions of ionizing photons.
21.03.2025 12:49 — 👍 0 🔁 0 💬 1 📌 0
What must be happening in those dark matter halos at z>12? We don’t know in detail, but we tried to constrain the number of UV photons that halos of different mass es should produce (with stars or with super-massive black holes).
21.03.2025 12:49 — 👍 0 🔁 0 💬 1 📌 0
We compare with some of the latest galaxy formation simulations, and we find that the efficiency of star formation at z>12 should increase, at least up to z~17. At z~25, no model predicts that we should be finding any galaxy. If those guys are confirmed, how they got there?!
21.03.2025 12:49 — 👍 0 🔁 0 💬 1 📌 0
We are witnessing the rise of the galactic empire, when galaxies started their journey in the Universe. From z~12, where we already have several confirmed galaxies , to z~17, the cosmic UV luminosity density decreases by a factor of 4, and by a factor of 25 up to z~25.
21.03.2025 12:49 — 👍 1 🔁 0 💬 1 📌 0
We estimate luminosity functions at z~17 and z~25. We are consistent with all previously estimated upper limits, and a bit below the numbers obtained by recent works at z~17. At z~25, we are the first ones to find candidates.
21.03.2025 12:49 — 👍 0 🔁 0 💬 1 📌 0
This work has only been possible thanks to all the folks in MIDIS and NGDEEP. Adding both datasets we have 40-80 hours exposure time per band, reaching magnitude 31.5 in all the relevant filters! (F200W through F444W).
21.03.2025 12:49 — 👍 0 🔁 0 💬 1 📌 0
We have just submitted a paper with z~17 and z~25 galaxy candidates discovered with @esawebb.org.web.brid.gy @nasawebb.extwitter.link . Hard task searching for those beasts, but we have 6 and 3 candidates at each redshfit. arxiv.org/abs/2503.15594
21.03.2025 12:49 — 👍 0 🔁 0 💬 1 📌 0
Quejas a la @raeinforma.bsky.social (y a la jefa de Materia @pflis.bsky.social ) por no dejarme escribir 'Universo' (el único que hay, con mayúscula), pero hoy hablamos en @elpais.com de "nuestro universo", y los que existen pero son de otros.
elpais.com/ciencia/vaci...
Había que escribir sobre Vega, aunque profesionalmente la "odio", tendría que explotar ya y así nos libraríamos (espero) de referenciar todas las magnitudes a algo que no es estándar. Fuera de bromas, ¡qué bonita es Vega! Nuevo artículo en Vacío cósmico, @elpais.com
elpais.com/ciencia/vaci...
