A Chandra X-ray study of millisecond pulsars in the globular cluster Omega Centauri: a correlation between spider pulsar companion mass and X-ray luminosity
| Title: | A Chandra X-ray study of millisecond pulsars in the globular cluster Omega Centauri: a correlation between spider pulsar companion mass and X-ray luminosity |
|---|---|
| Authors: | Zhao, Jiaqi, Heinke, Craig O. |
| Publication Year: | 2023 |
| Collection: | Astrophysics |
| Subject Terms: | Astrophysics - High Energy Astrophysical Phenomena |
| More Details: | Millisecond pulsars (MSPs) are faint X-ray sources commonly observed in Galactic globular clusters (GCs). In this work, we investigate 18 MSPs newly found in the GC Omega Centauri ($\omega$ Cen) and search for their X-ray counterparts using Chandra observations with a total exposure time of 290.9 ks. We identify confident X-ray counterparts for 11 of the MSPs, with 9 of them newly identified in this work based on their positions, spectral properties, and X-ray colours. The X-ray spectra of 9 MSPs are well described by a neutron star hydrogen atmosphere model, while 2 MSPs are well fitted by a power-law model. The identified MSPs have X-ray luminosities ranging from $1.0\times10^{30}$ erg s$^{-1}$ to $1.4\times10^{31}$ erg s$^{-1}$. Additionally, for population comparison purposes, we study the X-ray counterpart to MSP E in the GC M71, and find its X-ray spectrum is well described by blackbody-like models with a luminosity of $1.9\times10^{30}$ erg s$^{-1}$. We investigate the empirical correlations between X-ray luminosities and minimum companion masses, as well as mass functions, of spider pulsars. Clear correlations are observed, with best-fit functions of $\log_{10}{L_X} = (1.0\pm0.1) \log_{10}{M_{c, min}} + (32.5\pm0.2)$ and $\log_{10}{L_X} = (0.35\pm0.04) \log_{10}{\rm MF} + (32.71\pm0.20)$, respectively, with an intrinsic scatter of $\log_{10}{L_X}$ of $\sim$0.3, where $L_X$ is the 0.5$-$10 keV X-ray luminosity, $M_{c, min}$ is the minimum companion mass, and MF represents the mass function, in solar masses. Comment: 18 pages, 8 figures, 8 tables; accepted for publication in MNRAS |
| Document Type: | Working Paper |
| Access URL: | http://arxiv.org/abs/2309.13189 |
| Accession Number: | edsarx.2309.13189 |
| Database: | arXiv |
| FullText | Text: Availability: 0 CustomLinks: – Url: http://arxiv.org/abs/2309.13189 Name: EDS - Arxiv Category: fullText Text: View this record from Arxiv MouseOverText: View this record from Arxiv – Url: https://resolver.ebsco.com/c/xy5jbn/result?sid=EBSCO:edsarx&genre=article&issn=&ISBN=&volume=&issue=&date=20230922&spage=&pages=&title=A Chandra X-ray study of millisecond pulsars in the globular cluster Omega Centauri: a correlation between spider pulsar companion mass and X-ray luminosity&atitle=A%20Chandra%20X-ray%20study%20of%20millisecond%20pulsars%20in%20the%20globular%20cluster%20Omega%20Centauri%3A%20a%20correlation%20between%20spider%20pulsar%20companion%20mass%20and%20X-ray%20luminosity&aulast=Zhao%2C%20Jiaqi&id=DOI: Name: Full Text Finder (for New FTF UI) (s8985755) Category: fullText Text: Find It @ SCU Libraries MouseOverText: Find It @ SCU Libraries |
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| Header | DbId: edsarx DbLabel: arXiv An: edsarx.2309.13189 RelevancyScore: 1065 AccessLevel: 3 PubType: Report PubTypeId: report PreciseRelevancyScore: 1065.2587890625 |
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| Items | – Name: Title Label: Title Group: Ti Data: A Chandra X-ray study of millisecond pulsars in the globular cluster Omega Centauri: a correlation between spider pulsar companion mass and X-ray luminosity – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Zhao%2C+Jiaqi%22">Zhao, Jiaqi</searchLink><br /><searchLink fieldCode="AR" term="%22Heinke%2C+Craig+O%2E%22">Heinke, Craig O.</searchLink> – Name: DatePubCY Label: Publication Year Group: Date Data: 2023 – Name: Subset Label: Collection Group: HoldingsInfo Data: Astrophysics – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Astrophysics+-+High+Energy+Astrophysical+Phenomena%22">Astrophysics - High Energy Astrophysical Phenomena</searchLink> – Name: Abstract Label: Description Group: Ab Data: Millisecond pulsars (MSPs) are faint X-ray sources commonly observed in Galactic globular clusters (GCs). In this work, we investigate 18 MSPs newly found in the GC Omega Centauri ($\omega$ Cen) and search for their X-ray counterparts using Chandra observations with a total exposure time of 290.9 ks. We identify confident X-ray counterparts for 11 of the MSPs, with 9 of them newly identified in this work based on their positions, spectral properties, and X-ray colours. The X-ray spectra of 9 MSPs are well described by a neutron star hydrogen atmosphere model, while 2 MSPs are well fitted by a power-law model. The identified MSPs have X-ray luminosities ranging from $1.0\times10^{30}$ erg s$^{-1}$ to $1.4\times10^{31}$ erg s$^{-1}$. Additionally, for population comparison purposes, we study the X-ray counterpart to MSP E in the GC M71, and find its X-ray spectrum is well described by blackbody-like models with a luminosity of $1.9\times10^{30}$ erg s$^{-1}$. We investigate the empirical correlations between X-ray luminosities and minimum companion masses, as well as mass functions, of spider pulsars. Clear correlations are observed, with best-fit functions of $\log_{10}{L_X} = (1.0\pm0.1) \log_{10}{M_{c, min}} + (32.5\pm0.2)$ and $\log_{10}{L_X} = (0.35\pm0.04) \log_{10}{\rm MF} + (32.71\pm0.20)$, respectively, with an intrinsic scatter of $\log_{10}{L_X}$ of $\sim$0.3, where $L_X$ is the 0.5$-$10 keV X-ray luminosity, $M_{c, min}$ is the minimum companion mass, and MF represents the mass function, in solar masses.<br />Comment: 18 pages, 8 figures, 8 tables; accepted for publication in MNRAS – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/2309.13189" linkWindow="_blank">http://arxiv.org/abs/2309.13189</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.2309.13189 |
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| RecordInfo | BibRecord: BibEntity: Subjects: – SubjectFull: Astrophysics - High Energy Astrophysical Phenomena Type: general Titles: – TitleFull: A Chandra X-ray study of millisecond pulsars in the globular cluster Omega Centauri: a correlation between spider pulsar companion mass and X-ray luminosity Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Zhao, Jiaqi – PersonEntity: Name: NameFull: Heinke, Craig O. IsPartOfRelationships: – BibEntity: Dates: – D: 22 M: 09 Type: published Y: 2023 |
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