We have a weekly journal club where the group members and researchers at IAG interested in black holes and high-energy astrophysics gather to discuss and critique recent papers in the literature.


  • Black holes on all mass scales (stellar-mass, intermediate and supermassive); distances from close to the event horizon (hopefully not inside) to galactic scales (galaxy-SMBH coevolution)
  • Active galactic nuclei
  • Compact objects (e.g. neutron stars)
  • High-energy astrophysics
  • Observational, theoretical and computational papers welcomed
  • Eventual breakthrough discoveries in other fields also welcomed for discussion!

There will be no discrimination against any wavelength, given the multiwavelength interests in the group.


  • Keep up with the literature
  • Practice critical evaluation and discussion of papers
  • Identify ideas for future research
  • Put researchers at IAG talking to each other

Where and when

Thursdays, 4pm, sala A-305 @ IAG

Organizer: Fabio Cafardo


Update Oct 17 2020: we are moving away from Vox Charta and investigating other options. More news soon here.


  • Throughout the week, upvote papers that you find interesting and would be willing to talk about in our vox charta. Try to read the abstracts of the papers you vote for and be ready to talk about why you upvoted them.
Voting for a paper in vox charta.
  • Selecting your paper: You are free to select any paper in the topics mentioned above. You should browse the list of new papers at vox charta or have a look at papers upvoted by other people for inspiration. Sometimes, interesting papers from other areas outside astrophysics are also welcome. If you are not sure about which paper to present, pick one from the voted list.
  • Once you decide which paper you want to present, you should commit it to present (after upvoting it).
This is how you mark the paper you will present

At the meeting, we will display the list of upvoted papers. Each week, two people are assigned to present a recent paper (schedule available on Slack).


You should prepare to present your paper in about 20 minutes. Prepare alguns slides (de 3 a 5) abordando de maneira esquemática:

  1. Título, autores, número arXiv
  2. Contexto do trabalho (breve introdução, qual a questão científica abordada)
  3. Um ou dois dos principais resultados do paper
  4. Por que o paper lhe interessou?
  5. Alguma crítica em relação aos métodos ou abordagem?
  • Os slides vão facilitar para que as pessoas acompanhem melhor a discussão e consigam formular perguntas.
  • Procure não dissecar o seu paper durante a apresentação, entrando em detalhes exaustivos. Mantenha-se nos pontos essenciais

These guides may be of help: (1) How to read a scientific article. (2) HOWTO: • locate papers and assimilate their results • present a paper to colleagues • collect notes, PDFs and references


  • A day before the meeting, an e-mail will be sent to the JC mailing list with the agenda of voted papers
  • Vetoing: Occasionally, your paper can be vetoed—usually by Rodrigo—because it is judged to be not very interesting. Examples: strange theory papers, niche applications. If that happens, don’t take it personally and find another paper to present.
  • Free flow of ideas, critique and discussion will be encouraged. It is important that everybody should feel free to ask questions and criticize (this is what science is all about).
  • Everybody is welcomed to participate in the meetings even if they don’t bring a paper. However, if you regularly attend the journal club, it is recommended that you bring papers for discussion and participate in vox charta.


1 hour

Screenshot 2016-06-26 16.22.57
Black hole populations in the universe. Credit: R. Nemmen, based on images by NASA, VLA, STSCI

How to sign up for Vox Charta?

  1. Go to USP Black Holes Vox Charta and sign up
Screenshot 2018-04-15 23.38.59

2. Read “how to participate”

Please visit this link for more detailed information (and screenshots).

Mailing list, blog

Blog with papers that we discuss each week: agnclub.wordpress.com. Occasionally outdated.

Mailing list of the journal club.