Download A Statistical and Multi-wavelength Study of Star Formation by Corentin Schreiber PDF

By Corentin Schreiber

This thesis provides a pioneering process for gleaning the utmost details from the private photographs of the far-infrared universe received with the Herschel satellite tv for pc, attaining galaxies fainter by way of an order of significance than in past reviews. utilizing those fine quality measurements, the writer first demonstrates that nearly all of galaxy celebrity formation didn't occur in merger-driven starbursts over ninety% of the heritage of the universe, which means that galaxy progress is as an alternative ruled by way of a gradual infall of subject. the writer extra demonstrates that vast galaxies endure a steady decline of their megastar formation job, offering another course for galaxies to prevent famous person formation. one of many key unsolved questions in astrophysics is how galaxies obtained their mass during cosmic time. within the commonplace thought, the merging of galaxies performs an incredible function in forming new stars. Then, outdated galaxies suddenly cease forming stars via an unknown strategy. Investigating this conception calls for an impartial degree of the megastar formation depth of galaxies, which has been unavailable as a result of the dirt obscuration of stellar light.

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4 µm is called the Balmer break. This is conceptually identical to the Lyman break, except that this time the photons just have enough energy to ionize an hydrogen atom if this atom is in its first excited state, or above. Because a good fraction of the hydrogen atoms are in their ground state, photons with wavelengths shorter than the Balmer break have a fair chance of not being absorbed. However, the Balmer break is almost coincident in wavelength with another feature, called the 4000 Å break.

2010; Rodighiero et al. 2011; Elbaz et al. 2011; Magdis et al. 2012). In this thesis, I present in Chap. 2 (Sect. 6) new results about the evolution of the starburst population (introduced in the previous section) which are only based on this somewhat limited sample. Yet, we would definitely like to be able to measure SFRs for the remaining 85 %, since Herschel and Spitzer detections only unveil about half of the star formation rate density of the Universe (see Sect. , Leiton et al. 2015). This is actually possible by interpreting in a clever way the observed UV spectrum of the galaxy (Calzetti et al.

2000). , what we would see without dust, but we do have a good idea of the shape of this spectrum, in particular its spectral slope β. The spectral slope characterizes the way the light intensity varies with wavelength. 3 µm is fairly blue (see Fig. 5). Then, because the strength of the dust absorption depends on the wavelength, the light at the shortest wavelengths will be more attenuated than the light at the longest wavelengths. In the end, dust will tend to make the observed spectral slope redder (again, see Fig.

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