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Understanding dim globular cluster X-ray sources

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Understanding dim globular cluster X-ray sources
作者:	Heinke, Craig Owen.
面頁冊數:	360 p.
附註:	Adviser: Jonathan E. Grindlay.
附註:	Source: Dissertation Abstracts International, Volume: 65-05, Section: B, page: 2451.
Contained By:	Dissertation Abstracts International65-05B.
標題:	Physics, Astronomy and Astrophysics.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3131860
ISBN:	0496791001

Understanding dim globular cluster X-ray sources
Heinke, Craig Owen.

Understanding dim globular cluster X-ray sources [electronic resource] - 360 p.

Adviser: Jonathan E. Grindlay.

Thesis (Ph.D.)--Harvard University, 2004.

I detect nine faint X-ray sources in the dense, obscured globular cluster Terzan 5, in addition to the known LMXB which entered a rare bright state. The rich globular cluster M80 presents nineteen faint X-ray sources. I identify probable qLMXBs and cataclysmic variables (CVs) in Terzan 5 and M80 based on their X-ray spectra and colors.

ISBN: 0496791001Subjects--Topical Terms:

227131
Physics, Astronomy and Astrophysics.

Understanding dim globular cluster X-ray sources
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520 # $a I detect nine faint X-ray sources in the dense, obscured globular cluster Terzan 5, in addition to the known LMXB which entered a rare bright state. The rich globular cluster M80 presents nineteen faint X-ray sources. I identify probable qLMXBs and cataclysmic variables (CVs) in Terzan 5 and M80 based on their X-ray spectra and colors.
520 # $a I detect three hundred X-ray sources within the half-mass radius of 47 Tuc, of which seventy may be background sources. Twenty-nine sources are newly identified with chromospherically active binaries (ABs). X-ray color, spectral, and variability information indicates that fewer than sixty of the X-ray sources are millisecond pulsars. Three new qLMXB candidates are identified in 47 Tuc, one showing variable absorption and eclipses. The other two qLMXB candidates' spectra are dominated by hard power-law components, and show relatively low X-ray luminosities.
520 # $a I investigate the dim (LX < 10 35 ergs s-1) X-ray sources in galactic globular clusters, constraining their nature and properties with Chandra X-ray observations. Three faint X-ray sources are identified in a short Chandra observation of the globular cluster NGC 6652, in addition to a known low-mass X-ray binary (LMXB).
520 # $a I review several X-ray studies of globular clusters to study the populations of qLMXBs and probable CVs. Most of the identified qLMXBs show little evidence for a power-law component to their X-ray spectra. Their distribution among globular clusters is consistent with formation through close encounters. The distribution of probable CVs shows a weaker dependence on cluster density than that of qLMXBs, indicating that CVs undergo additional processes of destruction or formation.
520 # $a I study the spectral and temporal properties of two quiescent LMXBs (qLMXBs) in 47 Tuc, fitting their spectra with unmagnetized hydrogen-atmosphere neutron star models. Neither shows evidence for a power-law component, as observed in most qLMXBs in the galaxy. Spectral modeling of one (X7) requires a relatively high neutron star mass, >1.8 M&odot; , for a plausible radius range of 9--14 km. However, if accretion is continuing, it could alter the atmospheric opacity and allow a smaller mass.
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791 $a Ph.D.
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