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Persistent and Transient Blank Field Sources

This study presents a comprehensive analysis of persistent and transient blank field sources (BFS) associated with isolated neutron stars (DINS). We explore residual internal energy and interactions with surrounding environments. Notably, we examine low X-ray luminosity sources (Lx ~ 10^30 erg/s) and absorption lines below 1 keV. Using the ROSAT HRI wavelet catalogue, we outline progress on identifying transient blank field sources, offer spectral fits, and discuss future prospects for investigating the elusive nature of these astronomical phenomena.

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Persistent and Transient Blank Field Sources

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  1. Persistent and TransientBlank Field Sources A. TrevesInsubria University, Italy S. CampanaBrera Observatory, Italy M. ChieregatoInsubria University, Italy – Zürich University, Switzerland T. NelsonWisconsin University M. OrioTorino, Italy – Wisconsin University LONDON - April 2006

  2. Dim Isolated Neutron Stars (DINS) • Residual Internal Energy • Interaction with the surrounding • N ~ 108 – 109 LONDON - April 2006

  3. ROSAT – DINS • Blank Field Sources • Low X-ray Luminosity: Lx ~ 1030 erg/s • T < 100 eV • d ~ 100 pc • P ~ 5 – 10 s • Absorption lines < 1 KeV LONDON - April 2006

  4. Outline of the Contribution • BFS in the ROSAT HRI Wavelet Catalogue (Chieregato et al., 2005, A&A 444, 69) • Progress in ROSAT BFS • Transient Blank Field Sources • Future perspectives LONDON - April 2006

  5. BFS from HRI Catalogue • Blank Field Sources • fx > 2.7 x 10-13 erg/s • Nph>25 LONDON - April 2006

  6. BFS – HRI LONDON - April 2006

  7. 0421-57X-ray position and blue image LONDON - April 2006

  8. 1357+18X-ray position and blue image LONDON - April 2006

  9. 0421-57Spectral fits for PSPC observation LONDON - April 2006

  10. 0421-57Power law spectral fits for PSPC observation LONDON - April 2006

  11. Progress in BSF – HRI Reconsideration of 4 sources: • 0433+15 is a fake • 1357+18, 2007-48 are not spiky X-ray (SWIFT – Campana) • 1357+18 fx < 10-14 erg / s Optical (WIYN – Orio) • 1357+18 R > 23.4 LONDON - April 2006

  12. If the two TBSF were real… Total Number: • THRI~ 3 x 107 s • Ω~ 0.2 deg2 • Isotropic N ~ 105 y -1 Extragalactic: unlikely Gamma Ray Burst: unlikely LONDON - April 2006

  13. TBSF Non Collapsed Companions: unlikely • White Dwarfs • Neutron Stars Relation with transient PSR? Hiccups? LONDON - April 2006

  14. Progress Search for BFS with fx ~ 10-14 erg / s (Chandra, XMM, SWIFT) X- and optical archives LONDON - April 2006

  15. What we expect(dreams?) • DINS: accretion powered • TBFS • DINS cousins Isolated Black Holes Intermediate Mass Black Holes (ULX) LONDON - April 2006

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