Short hard bursts
description
Transcript of Short hard bursts
![Page 1: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/1.jpg)
Short hard bursts
S. R. Kulkarni
![Page 2: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/2.jpg)
References
• This is a tutorial • Primary reference: E. Berger (2013) Annual
Review• GW perspective: Kalsiwal & Nissanke (2013)
![Page 3: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/3.jpg)
Properties
• Defined primary by duration (T<2 s) and further refined by hardness ratio
• In the BATSE sample the rate of short hard bursts (SHBs) is one quarter that of the total population (the remaining are Long Soft bursts).
• Less fluence relative to long duration GRBs
![Page 4: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/4.jpg)
![Page 5: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/5.jpg)
![Page 6: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/6.jpg)
![Page 7: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/7.jpg)
Host Galaxies
• Found in all types of environments– Clusters of galaxies – Elliptical galaxies– Field star forming galaxies
• Interesting Clue: Association with ULRGs– GRB 100206A (dusty ULIRG, z=0.407)– GRB 120804A (dusty ULIRG, z=1.3)– But only 1% of mass is in ULIRGs
![Page 8: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/8.jpg)
![Page 9: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/9.jpg)
Comparing to other samples
• Long duration GRBs are primarily found in low mass star-forming galaxies
• SHBs appear to trace the field population of star forming galaxies
• Just like SN of type Ia, SHBs arise infield galaxies of both old population and young star forming field galaxies– However the SN rate is higher in star-forming
galaxies
![Page 10: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/10.jpg)
![Page 11: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/11.jpg)
![Page 12: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/12.jpg)
![Page 13: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/13.jpg)
![Page 14: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/14.jpg)
![Page 15: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/15.jpg)
![Page 16: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/16.jpg)
![Page 17: Short hard bursts](https://reader035.fdocuments.us/reader035/viewer/2022062222/56815fb0550346895dceaa3c/html5/thumbnails/17.jpg)