eROSITA study of 47 Tuc globular cluster Virtual Observatory Resource

Authors
  1. Saeedi S.
  2. Liu T.
  3. Knies J.
  4. Sasaki M.
  5. Becker W.
  6. Bulbul E.
  7. Dennerl K.,Freyberg M.
  8. Laktionov R.
  9. Merloni A.
  10. Published by
    CDS
Abstract

We present the results of the analysis of five observations of the globular cluster 47 Tucanae (47 Tuc) with eROSITA (extended Roentgen Survey with an Imaging Telescope Array) on board Spektrum-Roentgen-Gamma (Spektr-RG, SRG). The aim of the work is the study of the X-ray population in the field of one of the most massive globular clusters in our Milky Way. We focused on the classification of point-like sources in the field of 47 Tuc. The unresolved dense core of 47 Tuc (1.7' radius) and also the sources, which show extended emission are excluded in this study. We applied different methods of X-ray spectral and timing analysis together with multi wavelength studies for the classification of the X-rays sources in the field of 47 Tuc. We detected 888 point-like sources in the energy range of 0.2-5.0keV. We identified 126 background AGNs and 25 foreground stars. One of the foreground stars is classified as a variable M dwarf. We also classified 14 X-ray sources as members of 47 Tuc, including 1 symbiotic stars, 2 quiescent low mass X-ray binaries, and 4 cataclysmic variable. There are also 5 X-ray sources, which can either be a cataclysmic variable or a contact binary, and also 1 X-ray sources which can be an active binary (Type RS CVn). We identified one X-ray binary, which belongs to the Small Magellanic Cloud. Moreover, we calculated the X-ray luminosity function of 47 Tuc. No significant population that seems to belong to the globular cluster has been observed in the energy range of 0.5-2.0keV using eROSITA observations.

Keywords
  1. globular-star-clusters
  2. x-ray-binary-stars
  3. infrared-photometry
  4. visible-astronomy
Bibliographic source Bibcode
2022A&A...661A..35S
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/661/A35
IVOA Identifier IVOID
ivo://CDS.VizieR/J/A+A/661/A35
Document Object Identifer DOI
doi:10.26093/cds/vizier.36610035

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History

2022-05-18T13:56:18Z
Resource record created
2022-05-18T13:56:18Z
Created
2022-06-13T11:32:07Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr