The Role of Thermal Instabilities on the Theoretical Mass Function of MACHOs | Zendy

E. M. de Gouveia Dal Pino | Zendy; J. E. Horvath | Zendy; J. A. de Freitas Pacheco | Zendy

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The Role of Thermal Instabilities on the Theoretical Mass Function of MACHOs

Author(s) -

E. M. de Gouveia Dal Pino,

J. E. Horvath,

J. A. de Freitas Pacheco

Publication year - 1996

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/309868

Subject(s) - protogalaxy , instability , thermal , physics , thermal instability , function (biology) , mechanics , astrophysics , halo , thermodynamics , galaxy , evolutionary biology , biology , galaxy rotation curve

We analyze the primordial protogalactic gas to investigate the role ofthermal instabilities in the formation of condensations that could contributeto the MACHO mass function. We find that the previrialized protogalaxy couldhave undergone a thermally unstable regime which defines a peak in masscondensations starting around $0.1 \, M_{\odot}$ after being reprocessed by theenvironment which may be identified as giving origin to the MACHOs. Effects ofmagnetic fields on this instability-driven MACHOs scenario are also addressed.Comment: Latex file (uses aasms.sty), 13 pp. , no figures, to appear in ApJLett, January 10 issu

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