Population study of radio-quiet and thermally emitting isolated neutron stars
Langue Anglais
Ce document est protégé en vertu du Code de la Propriété Intellectuelle.
Auteur : Mancini Pires, Adriana
Date de soutenance : 30-11-2009
Directeur(s) de thèse : Motch, Christian - Janot-Pacheco, Eduardo
Établissement de soutenance : Université de Strasbourg
École doctorale : École doctorale Sciences de la Terre et Environnement (Strasbourg ; 2000-....)
Discipline : Astrophysique
Classification : Astronomie, cartographie, géodésie
Mots-clés libres : étoiles à neutrons , rayons X , hautes énergies , optique , catalogues
Mots-clés :
- Sources galactiques de rayons X
- Thèses et écrits académiques
- Étoiles
- Thèses et écrits académiques
- Étoiles à neutrons
- Thèses et écrits académiques
- Astronomie des rayons X
- Thèses et écrits académiques
- Modèles mathématiques
- Thèses et écrits académiques
Résumé : The main objective of the thesis is to study the properties of the Galactic population of radio-quiet and thermally emitting isolated neutron stars (INSs). This is done by studying further the existing neutron star sample of nearby seven sources, known as the Magnificent Seven (M7), as well as by searching for new candidates and constraining possible populations. During the thesis, we investigated the proper motions of three of the faintest M7 in X-rays with the satellite Chandra. This work allowed us to constrain the neutron star displacement in two cases as well as to accurately determine the high proper motion of a third source, for the first time in X-rays with a significance approaching 10 standard deviations (Motch, Pires, Haberl, & Schwope, 2007, Ap&SS, 308, 217; Motch, Pires, Haberl, Schwope, & Zavlin, 2009, A&A 497, 423). The search of new INS candidates in the serendipitous catalogue of the XMM-Newton Observatory, with more than 120; 000 X-ray sources, had as well the aim to constrain the spatial density of thermally emitting sources located beyond the solar vicinity. This work allowed the long awaited discovery of a new thermally emitting INS with properties similar to those of the seven nearby sources discovered by ROSAT (Pires, Motch, Turolla, Treves, & Popov, 2009, A&A 498, 233). Moreover, deep optical observations with SOAR and the ESO-VLT have been obtained during the thesis work in order to optically identify a handful of INS candidates that have been selected among more than 72; 000 sources (Pires, Motch, & Janot-Pacheco, 2009, A&A, 504, 185). Finally, population synthesis of Galactic thermally emitting INSs allows constraining the global properties of this population based on the whole sample of XMM-Newton observations. By estimating the density of similar sources at more remote distances in the Milky Way, the final objective is to determine whether the spatial density derived from the group of seven nearby sources is a local anomaly caused by the Sun s'current location near regions of active stellar formation of the Gould Belt.
Entrepôt d'origine : 
Identifiant : ecrin-ori-300139
Type de ressource : Thèse
