Cristina Ramos Almeida
@astrocra.bsky.social
Staff Scientist at the Instituto de Astrofísica de Canarias, Tenerife, Spain. Studying supermassive black holes and the galaxies they inhabit!
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/...
www.iac.es/en/outreach/...
June 18, 2025 at 10:09 AM
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/...
www.iac.es/en/outreach/...
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.
April 3, 2025 at 9:11 AM
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.
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.
April 3, 2025 at 9:11 AM
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.
April 3, 2025 at 9:11 AM
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.
April 3, 2025 at 9:11 AM
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.
April 3, 2025 at 9:11 AM
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 🤩🤩🤩
April 3, 2025 at 9:11 AM
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.
April 3, 2025 at 9:11 AM
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.
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 👇🧵
April 3, 2025 at 9:11 AM
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 👇🧵
March 16, 2025 at 11:22 PM
Wrapping up the Spanish ALMA Days at the IAC 📡📡📡 beautifully organized by Evanthia Hatziminaoglou
February 20, 2025 at 10:15 PM
Wrapping up the Spanish ALMA Days at the IAC 📡📡📡 beautifully organized by Evanthia Hatziminaoglou
Happy International Day of Women and Girls in Science!!!
February 11, 2025 at 2:49 PM
Happy International Day of Women and Girls in Science!!!