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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28215
Title: Galaxy Formation in Sterile Neutrino Dark Matter Models
Authors: MENCI, Nicola 
GRAZIAN, Andrea 
LAMASTRA, Alessandra 
CALURA, Francesco 
CASTELLANO, MARCO 
SANTINI, Paola 
Issue Date: 2018
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 854
Issue: 1
First Page: 1
Abstract: We investigate galaxy formation in models with dark matter (DM) constituted by sterile neutrinos. Given their large parameter space, defined by the combinations of sterile neutrino mass {m}<SUB>ν </SUB> and mixing parameter {\sin }<SUP>2</SUP>(2θ ) with active neutrinos, we focus on models with {m}<SUB>ν </SUB>=7 {keV}, consistent with the tentative 3.5 keV line detected in several X-ray spectra of clusters and galaxies. We consider (1) two resonant production models with {\sin }<SUP>2</SUP>(2θ )=5 × {10}<SUP>-11</SUP> and {\sin }<SUP>2</SUP>(2θ )=2 × {10}<SUP>-10</SUP>, to cover the range of mixing parameters consistent with the 3.5 keV line; (2) two scalar-decay models, representative of the two possible cases characterizing such a scenario: a freeze-in and a freeze-out case. We also consider thermal warm DM with particle mass {m}<SUB>X</SUB>=3 {keV}. Using a semianalytic model, we compare the predictions for the different DM scenarios with a wide set of observables. We find that comparing the predicted evolution of the stellar mass function, the abundance of satellites of Milky Way-like galaxies, and the global star formation history of galaxies with observations does not allow us to disentangle the effects of the baryonic physics from those related to the different DM models. On the other hand, the distribution of the stellar-to-halo mass ratios, the abundance of faint galaxies in the UV luminosity function at z≳ 6, and the specific star formation and age distribution of local, low-mass galaxies constitute potential probes for the DM scenarios considered. We discuss how future observations with upcoming facilities will enable us to rule out or to strongly support DM models based on sterile neutrinos.
URI: http://hdl.handle.net/20.500.12386/28215
URL: https://iopscience.iop.org/article/10.3847/1538-4357/aaa773
ISSN: 0004-637X
DOI: 10.3847/1538-4357/aaa773
Bibcode ADS: 2018ApJ...854....1M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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