東華大學圖書館 |

Language: English

Help

回圖書館首頁

手機版館藏查詢

Back

Switch To: Labeled | MARC Mode | ISBD

Inferences from Surface Thermal Emis...

Alford, Jason Alan Jackson.

Linked to FindBook

Google Book

Amazon

博客來

Inferences from Surface Thermal Emission of Young Neutron Stars.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Inferences from Surface Thermal Emission of Young Neutron Stars./
Author:	Alford, Jason Alan Jackson.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2020,
Description:	105 p.
Notes:	Source: Dissertations Abstracts International, Volume: 82-01, Section: B.
Contained By:	Dissertations Abstracts International82-01B.
Subject:	Physics. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27964158
ISBN:	9798641391113

Inferences from Surface Thermal Emission of Young Neutron Stars.
Alford, Jason Alan Jackson.

Inferences from Surface Thermal Emission of Young Neutron Stars. - Ann Arbor : ProQuest Dissertations & Theses, 2020 - 105 p.

Source: Dissertations Abstracts International, Volume: 82-01, Section: B.

Thesis (Ph.D.)--Columbia University, 2020.

This item must not be sold to any third party vendors.

We consider the question of the magnetic field configuration of central compact objects (CCOs), specifically if their observed spectra allow uniform surface temperatures and carbon atmospheres. Although it is theoretically plausible that young hot neutron stars will deplete their hydrogen and helium atmospheres through diffusive nuclear burning, we find that there is no strong observational evidence to suggest that any particular CCO has a uniform temperature carbon atmosphere. In fact, they all may have small hot spots, similar to what we have measured on the surface of RX J0822−4300, and what has been observed in the cases of two other CCOs, 1E 1207.4−5209 and PSR J1852+0040. We find it is likely that most CCOs have small magnetic inclination angles.We also study the magnetic field configurations of two particular young neutron stars through general relativistic modeling of the X-ray light curves produced by their thermal surface emission. In particular, we have analyzed over a decade of XMM-Newton observations of the central compact object RX J0822−4300 and also the transient magnetar XTEJ1810−197. We show that the CCO RX J0822−4300 has two heated regions with very dif-ferent sizes and temperatures, and we measure a significant deviation angle from a purelyantipodal geometry. This measurement can inform theoretical models of the strength and geometry of the crustal magnetic fields that conduct heat to toward these hot spots. We measure the size, temperature, angular emission pattern and viewing geometry toward the heated surface regions of the magnetar XTE J1810−197 in the years following its 2003 outburst. We demonstrate that, after the size and the temperature of the heated region shrank from what was measured in the initial outburst, the magnetar eventually entered a steady state with the hot spot luminosity powered by magnetic field decay. We find that the magnitude of the flux from the whole surface of XTE J1810−197, combined with several distance estimates, indicates that the mass of XTE J1810−197 must be significantly larger than the canonical 1.4 solar mass neutron star.

ISBN: 9798641391113Subjects--Topical Terms:

516296
Physics.
Subjects--Index Terms:

Neutron star

Inferences from Surface Thermal Emission of Young Neutron Stars.
LDR:03229nmm a2200349 4500 001 2273191
005 20201105110404.5
008 220629s2020 ||||||||||||||||| ||eng d
020 $a 9798641391113
035 $a (MiAaPQ)AAI27964158
035 $a AAI27964158
040 $a MiAaPQ $c MiAaPQ
100 1 $a Alford, Jason Alan Jackson. $3 3550619
245 1 0 $a Inferences from Surface Thermal Emission of Young Neutron Stars.
260 1 $a Ann Arbor : $b ProQuest Dissertations & Theses, $c 2020
300 $a 105 p.
500 $a Source: Dissertations Abstracts International, Volume: 82-01, Section: B.
500 $a Advisor: Halpern, Jules.
502 $a Thesis (Ph.D.)--Columbia University, 2020.
506 $a This item must not be sold to any third party vendors.
520 $a We consider the question of the magnetic field configuration of central compact objects (CCOs), specifically if their observed spectra allow uniform surface temperatures and carbon atmospheres. Although it is theoretically plausible that young hot neutron stars will deplete their hydrogen and helium atmospheres through diffusive nuclear burning, we find that there is no strong observational evidence to suggest that any particular CCO has a uniform temperature carbon atmosphere. In fact, they all may have small hot spots, similar to what we have measured on the surface of RX J0822−4300, and what has been observed in the cases of two other CCOs, 1E 1207.4−5209 and PSR J1852+0040. We find it is likely that most CCOs have small magnetic inclination angles.We also study the magnetic field configurations of two particular young neutron stars through general relativistic modeling of the X-ray light curves produced by their thermal surface emission. In particular, we have analyzed over a decade of XMM-Newton observations of the central compact object RX J0822−4300 and also the transient magnetar XTEJ1810−197. We show that the CCO RX J0822−4300 has two heated regions with very dif-ferent sizes and temperatures, and we measure a significant deviation angle from a purelyantipodal geometry. This measurement can inform theoretical models of the strength and geometry of the crustal magnetic fields that conduct heat to toward these hot spots. We measure the size, temperature, angular emission pattern and viewing geometry toward the heated surface regions of the magnetar XTE J1810−197 in the years following its 2003 outburst. We demonstrate that, after the size and the temperature of the heated region shrank from what was measured in the initial outburst, the magnetar eventually entered a steady state with the hot spot luminosity powered by magnetic field decay. We find that the magnitude of the flux from the whole surface of XTE J1810−197, combined with several distance estimates, indicates that the mass of XTE J1810−197 must be significantly larger than the canonical 1.4 solar mass neutron star.
590 $a School code: 0054.
650 4 $a Physics. $3 516296
650 4 $a Astrophysics. $3 535904
650 4 $a Electromagnetics. $3 3173223
653 $a Neutron star
653 $a Central compact object
653 $a Magnetic field configuration
690 $a 0605
690 $a 0596
690 $a 0607
710 2 $a Columbia University. $b Physics. $3 2101563
773 0 $t Dissertations Abstracts International $g 82-01B.
790 $a 0054
791 $a Ph.D.
792 $a 2020
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=27964158