Cristina Ramos Almeida

📸 Compartimos las primeras imágenes del cometa 2025 A6 Lemmon tomadas por nuestro colaborador Enol Matilla, ingeniero del IAC, desde el Observatorio del Teide la madrugada del domingo.

¡Mantente atento, pronto tendremos más novedades sobre este visitante cósmico que ya podemos seguir en el cielo! ☄️

El Gobierno promete 400 millones de euros para traer a España el Telescopio de Treinta Metros que Trump quiere cancelar El Ministerio de Ciencia impulsa la construcción del mayor observatorio del hemisferio norte en la isla de La Palma en lugar de Hawái

🔴 ÚLTIMA HORA | El Gobierno promete 400 millones para traer a España un telescopio gigante de 30 metros que Trump quiere cancelar

Our QSOFEED work based on JWST/MIRI data is now in press in A&A. Check the press release! #astrosci #jwst

www.iac.es/en/outreach/...

Our QSOFEED work based on JWST/MIRI data is now in press in A&A. Check the press release! #astrosci #jwst

www.iac.es/en/outreach/...

We are now on bluesky!

Follow us here to keep up with all our work using cutting-edge observations to understand the nuclear regions of active galaxies

#astronomy #astrophysics #space #physics #galaxies #blackholes

Slow your scroll! Watch an animation showing how winds and light from massive stars form pillars. The pillars’ tips are the densest.

Where have you seen pillars? Show us #NASAWebb and Hubble images in the comments!

Read more: bit.ly/41HF2Mj 🔭 🧪

Thanks Sarah!!! MIRI MRS is awesome!!!

Thanks!! indeed, this is just a teaser :)

I think I forgot to add the ☄️ #astrosci before posting this thread 🤔

JWST MIRI reveals the diversity of nuclear mid-infrared spectra of nearby type-2 quasars Type-2 quasars (QSO2s) are active galactic nuclei (AGN) seen through a significant amount of dust and gas that obscures the central supermassive black hole and the broad line region. Here we present n...

This research was done at @IAC_Astrofisica and @KICC_official , in collaboration with colleagues at other institutions around the globe. Stay tunned for more ✨QSOFEED✨ JWST/MIRI results!! arxiv.org/abs/2504.01595

This fantastic JWST/MIRI data from Cycle 2 GO proposal 3655 allowed us to start exploring the role of various AGN and galaxy properties including ionizing continuum, obscuration, electron density, and jet-ISM interactions on some of the spectral differences listed above. I hope you like it!

The electron densities that we measure from the [NeV]14.3/24.3 ratio (log ne>2.8 cm-3) range from are similar to those derived from the optical trans-auroral lines, and higher than those from the [SII] doublet.

In the case of J1010 & J1100, these SFRs are much lower than the SFRs measured from optical spectra probing the central 5-6 kpc of the QSO2s. This is likely due to the destruction of some PAH molecules by AGN radiation in the central kpc of the galaxies.

They show PAH emission features with EWs ranging from <0.002 to 0.075 micron, from which we measure a larger contribution from neutral molecules (PAH 11.3/6.2=1.3-3.4) and SFRs of <3-7 Msun/yr.

We measure warm molecular gas masses of 1-4x10^7 Msun and warm-to-cold gas mass ratios of 1-2%, with molecular gas excitation likely due to jet-induced shocks in J1430, and to UV heating and/or turbulence in J1509.

The [NeV]/[NeII] ratios range from 0.1 to 2.1 and [NeIII]/[NeII] from 1.0 to 3.5, indicating different coronal line and ionizing continuum strengths. Look at the low values of these ratios of J1010 (pink circle). The other four QSO2s have values similar to Seyfert galaxies.

In addition, two of the QSO2s show absorption bands of CO, H2O, and aliphatic grains. Together with the different silicate feature strengths, this indicates different levels of nuclear obscuration across the sample.

For comparison, Zakamska et al. (2016) reported a mean value of S9.7=-0.41±0.48 (median of -0.30) for a sample of 46 type-2 AGN (QSOs & Seyferts) observed with Spitzer/IRS.

One of the main differences are the silicate features. They show 9.7 micron silicate features going from emission (strength of S9.7=0.5 in J1010) to relatively strong absorption (S9.7=-1.0 in J1356) and 18 and 23 micron silicates either in emission or flat.

On the other hand, their nuclear mid-infrared spectra, which correspond to the central kiloparsec of the QSO2s, exhibit an unexpected diversity of both continua and features!!! Look at these beautiful JWST/MIRI spectra again 🤩🤩🤩

global SFRs that place them above the main sequence, and practically identical optical spectral shape (see optical SDSS spectra in this plot) and [OIII] luminosity.

Type-2 quasars (QSO2s) are active galactic nuclei (AGN) seen through a significant amount of dust and gas that obscures the central supermassive black hole and the broad line region. The five QSO2s that we studied were selected in the optical and they have log Lbol=45.5-46.0 erg/s,

New ✨QSOFEED✨paper out: "JWST MIRI reveals the diversity of nuclear mid-infrared spectra of nearby type-2 quasars" arxiv.org/abs/2504.01595 Here is a little thread with a summary of the results 👇🧵

Continuamos con las espectaculares composiciones de nuestros colaboradores de GRANTECANpic 2024 (www.gtc.iac.es/multimedia/g...). En este caso una composición de la galaxia M104 de Joaquín Arce y usando datos de la cámara OSIRIS de GTC.

Supermassive black hole caught playing with its food!

A ravenous & messy eater in galaxy NGC 4945 is blowing out powerful winds of material that will end up escaping the galaxy altogether.

Read more: www.eso.org/public/image...

📷 ESO/C. Marconcini et al.

🔭 🧪 ☄️

Angled from the upper left corner to the lower right corner is a cone-shaped orange-red cloud known as Herbig-Haro 49/50. This feature takes up about three-fourths of the length of this angle. The upper left end of this feature has a translucent, rounded end. The conical feature widens slightly from the rounded end at the upper right down to the lower right. Along the cone there are additional rounded edges, like edges of a wave, and intricate foamy-like details, as well as a clearer view of the black background of space. In the upper left, overlapping with the rounded end of Herbig-Haro 49/50, is a background spiral galaxy with a concentrated blue center that fades outward to blend with red spiral arms. The background of space is speckled with some white stars and smaller, more numerous, fainter white galaxies throughout.

NEW: #NASAWebb reveals a distant spiral galaxy perfectly aligned near the tip of Herbig-Haro 49/50—an outflow generated by a nearby still-forming star. This near- and mid-infrared image uncovers intricate details about how stars form: webbtelescope.pub/4iGQg9K 🔭 🧪

I am a professional astrophysicist, and I'd like to post results from our research here

Yes

@bot.astronomy.blue signup

Foto de mi ojo

Trabajo en visión y para explicar cómo vemos suelo empezar diciendo que los colores no existen, que son fruto de cómo nuestro cerebro interpreta las distintas longitudes de onda de la luz que llegan a nuestra #retina. Creo que va siendo hora de que haga por aquí un hilo sobre este tema. Hilo va!🧵