- CEA, CNRS, Université Paris-Saclay, Université Paris Diderot, Sorbonne Paris Cité
- Astrophysique Instrumentation Modélisation (AIM) & Départment d'AstroPhysique (DAp)
- Laboratoire de Formation des Étoiles et du Milieu Interstellaire (LFEMI)
- Nearby Universe Agents of Galaxy Evolution Studies (NUAGES)
1 RESEARCH ACTIVITY
1.1 Scientific Interests
My research activity revolves around the InterStellar Medium (ISM), which is the complex intertwining of phases, filling the volume of galaxies between the stars. The ISM is constituted of gas and small solid particles. Stars are born out of the graviational collapse of interstellar matter. The ISM is thus the key to understanding galaxy evolution.
I focus my research on cosmic nanoparticles, also vulgarly called dust. My main projects attempt at constraining the grain properties, in various environments (essentially nearby galaxies). Putting in perspective grain properties observed in different physical conditions provides constraints on dust evolution. Indeed, dust constantly evolves, cycling through the different phases of the ISM (cf. Fig. 1).
More generally, I am involved in several aspects of ISMism: studies of photo-ionization and photo-dissociation regions, characterization of the dark gas, and scrutinizing the impact of massive star formation on the surrounding ISM.
1.1.1 Methodological Approach
I usually approach the study of grain properties from the infrared-to-submillimeter Spectral Energy Distribution (SED) point of view (Fig. 2). The complex shape of the SED contains information about the composition, size and excitation of the grains. I have developed my own hierarchical Bayesian dust SED fitting model (HerBIE; Galliano, 2018). Such a code allows an optimal inference of the physical parameters, rigorously accounting for the different sources of uncertainty.
1.1.2 Participation to Large International Collaborations
- chargé de recherche (CNRS) at the Département d'Astrophysique, CEA/Saclay, France
- postdoctoral researcher at the University of Maryland, College Park, USA
- postdoctoral researcher (NRC/NPP fellow) at the NASA Goddard Space Flight Center, Greenbelt, Maryland, USA
- PhD thesis (CFR fellow) at the Service d'Astrophysique, CEA/Saclay, France
1.3 Publications, Oral Communications & Softwares
1.3.1 Publications in Scientific Journals
- Exhaustive publication list:
- Most notable papers
- by inverse chronological order:
- The Interstellar Dust Properties of Nearby Galaxies, F. Galliano, M. Galametz & A. P. Jones, 2018, Annual Review of Astronomy and Astrophysics, volume 56, pages 673-713 (open access PDF).
- A dust spectral energy distribution model with hierarchical Bayesian inference - I. Formalism and benchmarking, F. Galliano, 2018, Monthly Notices of the Royal Astronomical Society, volume 476, pages 1445-1469 (open access PDF).
- Non-standard grain properties, dark gas reservoir, and extended submillimeter excess, probed by Herschel in the Large Magellanic Cloud, F. Galliano, S. Hony, J.-P. Bernard, et al., 2011, Astronomy and Astrophysics, volume 536, article A88, 32 pages (open access PDF).
- Variations of the mid-IR fromatic features inside and among Galaxies, F. Galliano, S. C. Madden, A. G. G. M. Tielens, et al., 2008, The Astrophysical Journal, volume 679, pages 310-345 (open access PDF).
- Stellar Evolutionary Effects on the Abundances of Polycyclic Aromatic Hydrocarbons and Supernova-Condensed Dust in Galaxies, F. Galliano, E. Dwek & P. Chanial, 2008, The Astrophysical Journal, volume 672, pages 214-243 (open acess PDF).
- ISM properties in low-metallicity environments. III. The spectral energy distributions of II Zw 40, He 2-10 and NGC 1140, F. Galliano, S. C. Madden, A.P. Jones, et al., 2005, Astronomy and Astrophysics, volume 434, pages 867-885 (open access PDF).
- ISM properties in low-metallicity environments. II. The dust spectral energy distribution of NGC 1569, F. Galliano, S. C. Madden, A. P. Jones, et al., 2003, Astronomy and Astrophysics, volume a407, pages 159-176 (open access PDF).
1.3.2 Recent Talks
- The Interstellar Dust Properties and their Evolution in Galaxies: lecture given at the Ecole Doctorale d'Astronomie & Astrophysique d'Île de France, in 2021, consisting in an introduction to interstellar dust and its application to galaxies.
- A Nearby Galaxy Perspective on Dust Evolution: seminar given during a Supernova Teletalk, in 2020, presenting results of the DustPedia project.
- Hierarchical Bayesian Inference - Its Application to Dust Emission Modelling: talk given at the Institut Pascal, in 2019, during the AstroDat meeting, presenting my approach to modelling astrophysical data.
- The Quantification of Beliefs, from Bayes to A.I., and Its Consequence on the Scientific Method: talk at DAp, in 2019, during an Astromind meeting, presenting some thoughts and research in epistemology and history of science.
- Explorer l'écosystème interstellaire: outreach article on The Conversation (in french).
1.3.4 Select Research Notes
- Interstellar dust grain properties:
- computation and implementation in SwING:
- Photometric filters:
- color corrections and calibration uncertainties:
- Robust estimators
- of the moments of a distribution:
- Displaying uncertainties
- in correlation plots:
- Gitlab page:
- (SoftWare for Investigating Nebulae and Galaxies).
- Small utilities
- in Python:
2 ADMINISTRATIVE RESPONSABILITIES
2.1 The Scientific Council of PCMI
- is a national program of the Institut National des Sciences de l'Univers (INSU) within CNRS. It stands for Physique et Chimie du Milieu Interstellaire. It is aimed at bringing together the french researchers working on different aspects of the ISM: observations, simulations and laboratory experiments. Each year, it distributes operating grants. It organizes a biennial colloquium.
2.2 The DAp Seminar Committee
2.2.1 For Speakers
2.3 An International School for Astronomers
- the interstellar medium of galaxies, from the epoch of reionization to the Milky Way.
- July 19 to 23, 2021.
- observatoire océanographique de Banyuls-sur-Mer, France.