David Sobral 💫

Paper Day! You may have heard about these "Little Red Dots" in JWST data. Here we use new high quality spectra to show that the their spectral appearance is primarily set by the properties of surrounding gas: LRDs are hot engines covered by dense gas arxiv.org/abs/2603.17667

@sfseiji @Rohan_Naidu @NASAWebb Awesome work, looking forward to know what you find!

And yes, we’ve even been awarded ~40 hours of JWST DDT follow-up time for this candidate, and @Rohan_Naidu and I have been seriously working for it with the awesome GLIMPSE team members! Exciting times ahead!!✨ @NASAWebb

Our recent Pop III paper got a major spotlight in a news article in Science! Appreciate the great highlights from @DanClery!

Great article on our Pop III paper, co-led with @sfseiji. Thanks for capturing the excitement so well @DanClery science.org/content/articl…

J-PLUS: Spectroscopic validation of Hα emission line maps in spatially resolved galaxies, out today ⭐ arxiv.org/abs/2502.05830

Detecting the first stars (PopIII) is a long-held dream for astronomers. We developed a novel technique, applied it to JWST legacy data, and discovered a promising PopIII galaxy candidate at z=6.5 in GLIMPSE!

More exciting measurements on the most luminous little red dot that I know of (F444W=22 at z=4.5!): an unambiguous AGN and a Balmer break in deep UNCOVER and ALT spectroscopy arxiv.org/abs/2412.04557

Yesterday was paper day! With deep JWST data from the ALT survey we provide new independent evidence that the new population of faint AGNs in the early Universe seems to have so-called overly massive black holes compared to their stellar mass arxiv.org/abs/2412.02846

arxiv.org/abs/2411.08627 very nice to see what JWST and the amazing NIR IFU capabilities revealed on CR7, confirming so many interpretations and measurements that got built step by step first from super limited data, to then ALMA, MUSE and now JWST, and also adding so much more

Check out our work using JWST to look at the environment in which ancient supermassive black holes grow. With @jorryt_m @Rohan_Naidu @MinghaoYue and the EIGER team!

The JWST Emission Line Survey (JELS): An untargeted search for Hα emission line galaxies at z>6 and their physical properties arxiv.org/abs/2410.11808

The JWST Emission Line Survey (JELS): Extending rest-optical narrow-band emission line selection into the Epoch of Reionization arxiv.org/abs/2410.09000

#BreakingNews Space oddity: Most distant Milky-Way-like galaxy yet observed. 🌀Dubbed REBELS-25, this disc galaxy seems as orderly as present-day galaxies, but we see it as it was when the Universe was only 700 million years old 🔗almaobservatory.org/en/press-relea…

Loveeee this paper from @Rohan_Naidu and Jorryt Matthee and team!!! Beyond the great science, it has two first authors and has been submitted to the Open Journal of Astrophysics. 🚀💫 The best way forward is action! Hope you don't mind, made you a little podcast with Google Illuminate illuminate.google.com/library?play=I….

Today on the arXiv: All the Little Things in the Abell 2744 field: ~1600 redshifts measured with our Cycle 2 NIRCam grism program, and much, much more, showcasing the discovery space of this instrument Among these 1600: 1) An analog of the Milky Way + local group 12.7 Gyr ago

The earliest galaxies formed amazingly fast after the Big Bang. Do they break the universe or change its age? bit.ly/47OpFU1

@Introspect_Rych @astrojansen @stefanocarniani arxiv.org/abs/1312.0684 finally materialising. If we knew where to point ALMA we could have done it years ago

@astrojansen @stefanocarniani One point we thought was interesting is that (for this galaxy at least) ALMA proved more efficient at detecting [OIII]88 than JWST is at detecting CIII]1907,1909...

We detected oxygen in a galaxy at z=14.18ish, refining the redshift. @stefanocarniani led the paper and we also confirmed the detection of carbon from JWST. arxiv.org/abs/2409.20533

Just wanted to quickly advertise a really exciting new result just obtained by ALMA involving the detection (6.6 sigma) of the [OIII]88 line at z=14.1793 put together by an awesome PhD student in Leiden with the name of Sander Schouws. The [OIII]88 line detection was found by

🌌 Job Opportunity: Postdoc Fellowships in Computational Astrophysics Join my ERC #BlackHoleWeather project (2M Eur) to study black hole feeding & feedback through cutting-edge HPC simulations and multiwavelength data. 💡 3-year position, extendable to 5+ and potentially becoming tenure-track 💰 Tax-free salary + large travel/equipment funding 📝 Apply by Oct 14! 🔗 Details: aas.org/jobregister/ad…

Are you an ECR? Do you like #JWST ? High-z galaxies/SMBHs? Skiing/curling/ice-skating in the Swiss Alps? Applications are now open for the 54th Saas-Fee Course on "Galaxies and Black Holes in the 1 Gyr as seen with the JWST" - Jan 27-31, 2025 - more info: astro.unige.ch/saasfee2025/