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Super-resolution Fluorescence Microscopy

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An optical supernova associated with the X-ray flash XRF 060218.

E Pian1, P A Mazzali, N Masetti

  • 1Istituto Nazionale di Astrofisica, Trieste Astronomical Observatory, via G. B. Tiepolo 11, I-34131 Trieste, Italy. pian@oats.inaf.it

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This study links X-ray flashes (XRFs) to less luminous supernovae, expanding the known connection between gamma-ray bursts (GRBs) and supernovae. This suggests intrinsically weak XRF events are more common than previously thought.

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Area of Science:

  • * Astrophysics
  • * High-energy astrophysics
  • * Observational cosmology

Background:

  • * Long-duration gamma-ray bursts (GRBs) are typically associated with luminous Type Ic supernovae ejecting material at high velocities.
  • * Less luminous supernovae were not previously linked to GRBs, suggesting GRB-supernovae are rare.
  • * The association of X-ray flashes (XRFs) with supernovae and their nature (intrinsically weak vs. off-axis GRBs) remained unclear.

Purpose of the Study:

  • * To investigate the association between X-ray flashes and supernovae.
  • * To determine if XRFs are intrinsically weak events or classical GRBs viewed off-axis.
  • * To extend the GRB-supernova connection to fainter events.

Main Methods:

  • * Optical discovery and follow-up observations of supernova SN 2006aj.
  • * Spectroscopic analysis to determine ejecta velocities.
  • * Integration of optical data with existing radio and X-ray observations of XRF 060218.

Main Results:

  • * Supernova SN 2006aj, associated with XRF 060218, is less luminous than typical GRB-supernovae but more luminous than supernovae without GRBs.
  • * Ejecta velocities for SN 2006aj are intermediate, consistent with weaker GRB output and radio flux.
  • * Data suggest XRF 060218 is an intrinsically weak and soft event, not an off-axis GRB.

Conclusions:

  • * The GRB-supernova connection is extended to include X-ray flashes and less luminous supernovae.
  • * XRF 060218 represents an intrinsically weak event, challenging previous assumptions.
  • * Events like XRF 060218 are likely more common than classical GRB-supernovae, implying a shared origin.