Transients Classification Tools

Gosia Pietka

Transcript

1. Transients Classification Tools
   TKP meeting
   4 Dec 2012, Amsterdam
   Gosia Pietka, Rob Fender, Adam Stewart, Teo Muñoz-Darias
   

   View Slide

2. TraP process flow  
   Data Imaging Source Finder
   Initial classification
   based on the radio
   information
   Classification based on
   radio + optical data
   No  further  
   observa.ons  
   Fast ToO
   Slow ToO Slow
   Fast
   Not exciting
   Request for
   more
   observations
   Optical,
   X-ray, radio
   follow up
   

   View Slide

3. Van der Laan Synchrotron Bubble Model
   −  ℎ∝    
   ≫1   ≪1  
    ℎ    ℎ  
   ≈1  
   

   View Slide

4. Flux as a function of time  
   

   View Slide

5.  
   Phase 1: Slope
   

   View Slide

6.  
   Phase 1: Slope
   

   View Slide

7. Phase 1: Slope
   (Pietka & Fender in prep.)
   Peak  radio  luminosity  [erg/s]  vs  rising  rate  of  the  lightcurve  
   Slow Fast
   

   View Slide

8.    
   Probability  distribu:on  of  source  classifica:on  a          SN  
            GRB  
   Blazar  
   XRB  
   Flare  
   Stars  
   QSO  
   Binary  
   AGN  
   TDE  
   Nova  
    
   Phase 1: Slope
   Slow   Fast  
   

   View Slide

9.  
   Phase 2: Slope + Rise Time
   

   View Slide

10. Phase 2: Slope + Rise Time
    (Pietka & Fender in prep.)
    Fast
    Fast
    Slow
    Slow  
    

    View Slide

11.  
    Phase 2: Slope + Rise Time
    Fast
    Fast
    

    View Slide

12.  
     
    Phase 2: Slope + Rise Time
    

    View Slide

13.  
    Phase 3: Slope + Rise Time + Decline time
    

    View Slide

14. Flux vs time for different types of objects
    Flux (Jy)
    Time(day)
    XRB  
     
    SN  
     
    Blazar  
    

    View Slide

15. Flux density at different frequencies
     
    

    View Slide

16. TraP process flow  
    Data Imaging Source Finder
    Initial classification
    based on the radio
    information
    Classification based on
    radio + optical data
    No  further  
    observa.ons  
    Fast ToO
    Slow ToO
    Optical,
    X-ray, radio
    follow up
    Slow
    Fast
    Not exciting
    Request for
    more
    observations
    

    View Slide

17. ● 
    RADIO/OPTICAL IDENTIFICATION of point sources
    (Stewart, Muñoz-Darias & Fender in prep.)
    "  
    Diagrams using Optical/IR/Radio fluxes and colours
    o 
    The simpler the better
    o 
    Quick identification of the nature of the transients:
    follow up?
    "  (simultaneous) Radio (few GHz), Optical (V/R bands):
    
    ★  Supernovae, Gamma Ray Burst
    
    ★  X-ray binaries, CVs, different flavours of pulsars
    
    ★  Active stars ( many thanks to Manuel Güdel)
    
    ★  QSOs - Radio (e.g. PKS) and optically selected (SLOAN)
    
    

    View Slide

18. Colour magnitude diagram
    

    View Slide

19. Conclusion
     
     
    •  Radio  informa.on:  
    ü Slope  
    ü Rise  .me  
    ü Decline  .me  
    •  Radio  +  op.cal    
     
    •  Extrapola.on  of  the  results  to  the  lower  frequencies  
    data,  based  on  the  van  der  Laan  model  
    

    View Slide

20. Conclusion
     
     
    

    View Slide