Zobrazeno 1 - 10
of 93
pro vyhledávání: '"Haemmerle, L."'
Autor:
Martinet, S., Meynet, G., Nandal, D., Ekström, S., Georgy, C., Haemmerlé, L., Hirschi, R., Yusof, N., Gounelle, M., Dwarkadas, V.
Publikováno v:
A&A 664, A181 (2022)
The $^{26}$Al short-lived radioactive nuclide is the source of the observed galactic diffuse $\gamma$-ray emission at 1.8 MeV. While different sources of $^{26}$Al have been explored, such as AGB stars, massive stars winds, and supernovae, the contri
Externí odkaz:
http://arxiv.org/abs/2205.15184
Publikováno v:
A&A 652, L7 (2021)
The formation of the most massive quasars observed at high redshifts requires extreme inflows of gas down to the length scales of the central compact object. Here, we estimate the maximum inflow rate allowed by gravity down to the surface of supermas
Externí odkaz:
http://arxiv.org/abs/2105.13373
Autor:
Holgado, G., Simón-Díaz, S., Haemmerlé, L., Lennon, D. J., Barbá, R. H., Cerviño, M., Castro, N., Herrero, A., Meynet, G., Arias, J. I.
Publikováno v:
A&A 638, A157 (2020)
The apparent lack of massive O-type stars near the zero-age main sequence (at ages < 2 Myr) is a topic widely discussed. Different explanations for this elusive detection have been proposed, but no firm conclusions have been reached yet. We reassess
Externí odkaz:
http://arxiv.org/abs/2005.05446
Publikováno v:
A&A 633, A9 (2020)
Globular clusters contain multiple stellar populations with peculiar chemical compositions. Pollution of the intracluster gas by an early population of fast-evolving stars is the most common scenario for explaining the observations. Stars with masses
Externí odkaz:
http://arxiv.org/abs/1911.04763
Major mergers of gas-rich galaxies provide promising conditions for the formation of supermassive black holes (SMBHs; $\gtrsim10^5$ M$_\odot$) by direct collapse because they can trigger mass inflows as high as $10^4-10^5$ M$_\odot$ yr$^{-1}$ on sub-
Externí odkaz:
http://arxiv.org/abs/1910.04776
Massive young stellar object (MYSOs) form during the collapse of high-mass pre-stellar cores, where infalling molecular material is accreted through a centrifugally-balanced accretion disc that is subject to efficient gravitational instabilities. In
Externí odkaz:
http://arxiv.org/abs/1906.02015
Autor:
Haemmerlé, L., Eggenberger, P., Ekström, S., Georgy, C., Meynet, G., Postel, A., Audard, M., Sørensen, M., Fragos, T.
Publikováno v:
A&A 624, A137 (2019)
Grids of stellar models are useful tools to derive the properties of stellar clusters, in particular young clusters hosting massive stars, and to provide information on the star formation process in various mass ranges. Because of their short evoluti
Externí odkaz:
http://arxiv.org/abs/1903.10550
Massive protostars grow and evolve under the effect of rapid accretion of circumstellar gas and dust, falling at high rates ($\ge 10^{-4}$-$10^{-3}\, \rm M_{\odot}\, \rm yr^{-1}$). This mass infall has been shown, both numerically and observationally
Externí odkaz:
http://arxiv.org/abs/1812.10762
Autor:
Schleicher, D. R. G., Fellhauer, M. A., Boekholt, T., Reinoso, B., Klessen, R. S., Vergara, M. Z. C., Seguel, P. J. Alister, Bovino, S., Olave, C., Díaz, V. B., Fibla, P., Riaz, R., Bandyopadhyay, B., Martin-Perez, R. I. San, Zamponi, J., Haemmerle, L.
To explain the observed population of supermassive black holes at z~7, very massive seed black holes or, alternatively, super-Eddington scenarios are needed to reach final masses of the order of 10^9 solar masses. A popular explanation for massive se
Externí odkaz:
http://arxiv.org/abs/1812.02052
Autor:
Boekholt, T. C. N., Schleicher, D. R. G., Fellhauer, M., Klessen, R. S., Reinoso, B., Stutz, A. M., Haemmerle, L.
Models aiming to explain the formation of massive black hole seeds, and in particular the direct collapse scenario, face substantial difficulties. These are rooted in rather ad hoc and fine-tuned initial conditions, such as the simultaneous requireme
Externí odkaz:
http://arxiv.org/abs/1801.05841