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Exploring Short Hard Bursts in Star-Forming Galaxies

Discover the intriguing properties of Short Hard Bursts (SHBs) in different galaxy environments. Learn about their association with ULIRGs and the contrast with long duration GRBs. This tutorial delves into the field population of star-forming galaxies hosting SHBs and sheds light on their distribution.

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Exploring Short Hard Bursts in Star-Forming Galaxies

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  1. Short hard bursts S. R. Kulkarni

  2. References • This is a tutorial • Primary reference: E. Berger (2013) Annual Review • GW perspective: Kalsiwal & Nissanke (2013)

  3. 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

  4. 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

  5. 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

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