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Persistent and Transient Blank Field Sources

Persistent and Transient Blank Field Sources. A. Treves Insubria University, Italy S. Campana Brera Observatory, Italy M. Chieregato Insubria University, Italy – Z ü rich University, Switzerland T. Nelson Wisconsin University M. Orio Torino, Italy – Wisconsin University.

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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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