Nicolas Tejos

Nicolas Tejos


  • Profesor Asociado
  • Instituto de Fisica, Facultad de Ciencias
  • Pontificia Universidad Catolica de Valparaiso
  • Casilla 4059, Valparaiso, Chile
  • ☎ +56 32 227 4900

Last update: May, 2018

About me

News (01/02/18): Nota de prensa El Mercurio
News (01/10/17): Entrevista El Mercurio de Valparaiso

I am a Chilean astrophysicist working in the Instituto de Fisica at Pontificia Universidad Catolica de Valparaiso (PUCV). My main research interest is on the connection between the intergalactic medium (IGM) and galaxies, in the context of the large-scale structure of the Universe. I am mainly focused on how this relationship depends on cosmic environment (voids, filaments, groups, clusters), and cosmic time (early and late Universe). Ultimately, I wish to test the current cosmological paradigm prediction that baryonic matter follows the cosmic web shaped by dark matter and dark energy.

I obtained my B.Sc. and M.Sc. degrees in Astronomy at Universidad de Chile; my M.Sc. thesis was on Absorption systems in optical spectra of gamma-ray bursts (GRBs) afterglows, under supervision of Prof. Sebastian Lopez. Then I moved to the UK, where I obtained my Ph.D. degree in Astrophysics at University of Durham; my Ph.D. thesis was on The relationship between the intergalactic medium and galaxies under supervision of Prof. Simon L. Morris and Prof. Tom Theuns. My first postdoctoral position was at the University of California, Santa Cruz where I worked in close collaboration with Prof. J Xavier Prochaska and the IMPS group. I then moved back to Chile, for my second postdoctoral position at the Millennium Institute of Astrophysics being hosted by the Pontificia Universidad Catolica de Chile. After that, I moved to Valparaiso as a faculty at PUCV since August 2017. During my professional career, I have been the PI on multiple world-class telescope projects, including five on the Hubble Space Telescope (HST) and several on the Very Large Telescope (VLT), Gemini, Magellan, among others.

Scientific Interests

  • Intergalactic medium
  • Galaxy evolution
  • IGM-galaxy connection
  • Large-scale structure
  • Cosmology
  • Spectroscopy
  • Active Galactic Nuclei
  • Gamma-ray Bursts
  • Fast Radio Bursts

"Believe nothing on the faith of traditions,
even though they have been held in honor
for many generations and in diverse places.
Do not believe a thing because many people speak of it.
Do not believe on the faith of the sages of the past.
Do not believe what you yourself have imagined,
persuading yourself that a God inspires you.
Believe nothing on the sole authority of your masters and priests.
After examination, believe what you yourself have tested
and found to be reasonable,
and conform your conduct thereto."

- Siddhartha Gautama