State-of-the-art cosmological hydrodynamical simulations have star particles with a typical mass between ∼108 and ∼103 M⊙ according to resolution, and treat them as simple stellar populations. On the other hand, observations in nearby galaxies resolve individual stars and provide us with single star properties. An accurate and fair comparison between predictions from simulations and observations is a crucial task. We introduce a novel approach to consistently populate star particles with stars. We developed a technique to generate a theoretical catalogue of mock stars whose characteristics are derived from the properties of parent star particles from a cosmological simulation. Also, a library of stellar evolutionary tracks and synthetic spectra is used to mimic the photometric properties of mock stars. The aim of this tool is to produce a data base of synthetic stars from the properties of parent star particles in simulations. Such a data base represents the observable stellar content of simulated galaxies and allows a comparison as accurate as possible with observations of resolved stellar populations. With this innovative approach, we are able to provide a colour-magnitude diagram from a cosmological hydrodynamical simulation. This method is flexible and can be tailored to fit output of different codes used for cosmological simulations. Also, it is of paramount importance with ongoing survey data releases (e.g. GAIA and surveys of resolved stellar populations), and will be useful to predict properties of stars with peculiar chemical features and to compare predictions from hydrodynamical models with data of different tracers of stellar populations.

Colour–magnitude diagram in simulations of galaxy formation

Milena Valentini
;
Stefano Borgani;Giuseppe Murante;Luca Tornatore
2018-01-01

Abstract

State-of-the-art cosmological hydrodynamical simulations have star particles with a typical mass between ∼108 and ∼103 M⊙ according to resolution, and treat them as simple stellar populations. On the other hand, observations in nearby galaxies resolve individual stars and provide us with single star properties. An accurate and fair comparison between predictions from simulations and observations is a crucial task. We introduce a novel approach to consistently populate star particles with stars. We developed a technique to generate a theoretical catalogue of mock stars whose characteristics are derived from the properties of parent star particles from a cosmological simulation. Also, a library of stellar evolutionary tracks and synthetic spectra is used to mimic the photometric properties of mock stars. The aim of this tool is to produce a data base of synthetic stars from the properties of parent star particles in simulations. Such a data base represents the observable stellar content of simulated galaxies and allows a comparison as accurate as possible with observations of resolved stellar populations. With this innovative approach, we are able to provide a colour-magnitude diagram from a cosmological hydrodynamical simulation. This method is flexible and can be tailored to fit output of different codes used for cosmological simulations. Also, it is of paramount importance with ongoing survey data releases (e.g. GAIA and surveys of resolved stellar populations), and will be useful to predict properties of stars with peculiar chemical features and to compare predictions from hydrodynamical models with data of different tracers of stellar populations.
2018
Pubblicato
https://watermark.silverchair.com/sty1896.pdf?token=AQECAHi208BE49Ooan9kkhW_Ercy7Dm3ZL_9Cf3qfKAc485ysgAAA1gwggNUBgkqhkiG9w0BBwagggNFMIIDQQIBADCCAzoGCSqGSIb3DQEHATAeBglghkgBZQMEAS4wEQQMkvDewq_3On8nAxrWAgEQgIIDC5yAkvZeGYPUvTnBQ3R0Kxnh8CQwh-B6pZyLb339TnSOFK_LcAT8rMGKl7O2A1y2sJF-ONU2ZrhcZ90iE4KA153nDah1gspRX3dyx-ZLtMYmPkzUp2bg04_kDMN89ahcw0QgkZytFpUIBogB_8LHk8XMkR4G0BC7DqDWLonBer3Fyv_2W6WEIPMifIPDNVNKHs22Ins5NBJQkeqxcoTkrL4JYq0l1jLU7ZtzsfTml9lLEsaID4DfBpISdrSwG1eUhFCgdipFi8or-2kpr58zRp7bCwWbHfiMw-EegQeMu8zg2s6tu2JpZAguZLBWQPC2o8PSBXNvFNT__vemmpT_7_k4r12vy6GEqDoLLHik-91zUSNf8-Et2iOOJz8XM9kkVwdsGcooFneQ2M0clPyGEzN8t-YOpgVF-LhQjmiCDpeOFR2R2fcnOgx_K293x4BFYA1-Y8WSj2WWJYzMKMMoqlMOq0fn_AAWmRxfW7zszCrz12JepblEA4vflJT6DnTcLfNpOf000BXANDXyNQ0LzGCSCjObVJt3aBZ9Ow-BpoJr0SW-Rn14mcQaEdA-bQgJgyNaMbhoRCj4Iyp4_g5NtfxNIdLGrjqaF9O-cDh6b_0WyEgF1TKmVUSgheXuNB1ZoN9ON0KCqVSTnLfDyMjAn_HilraVIKpP8FQTgFuujH5tdFuzrHmBMLOx_d8LXlOmFiKcxkhQ44Np2WZpNsCg6KHp5typuiPDxEt-q1Hj4iUrlQ6YmBxA2k4MLoLX8ax8H6CR8P6KutgXe37P-zquX3nelW7NzUjlqMfgu_SoQNlC49FrDGe13NO8sGzUF9ErEj5awedcE6-TL9ULoEb31MzXnfIkHQQTPTjmQafxqh9qzCzBsgp_-mYGhqmRkRXjPni3S80mOOfSB6NTJ43EmWBKFq_HKk5iTtbacJCqBsj3O0h9w2hpJHcp7TbtbAJCm0rR0-uZ9r8tDp6huYRaKfrCkQA9bT9Y_dhbWyCgezfJEWaQ2Jsv5Dk9GGyG3bvu8UaudlZsQMTduLtA
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/3061738
 Avviso

Attenzione! I dati visualizzati non sono stati sottoposti a validazione da parte dell'ateneo

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 9
  • ???jsp.display-item.citation.isi??? 8
social impact