Local Rate of Short-hard Gamma-ray Bursts and Their Progenitor Lifetimes

다국어 초록 (Multilingual Abstract)

Gamma-ray bursts have been divided into two classes, long-soft gamma-ray bursts (L-GRBs) and short-hard gamma-ray bursts (SHBs) according to the bimodal distribution in the duration time.
Due to the harder spectrum and the lack of afterglows of short-hard bursts in optical and radio observations, different progenitors for short-hard bursts and long-soft bursts have been suggested.
Based on the X-ray afterglow observation and the cumulative red-shift distribution of short-hard bursts, Nakar et al. (2006) found that the progenitors of short-hard bursts are consistent with old populations, such as mergers of binary neutron stars. Recently, the existence of two subclasses in long-soft bursts has been suggested after considering multiple characteristics of gamma-ray bursts,including fluences and duration times. In this work, we extended the analysis of the cumulative redshift distribution to two possible subclasses in L-GRBs. We found that two possible subclass GRBs show different red-shift distributions, especially for red-shifts z > 1. Our results indicate that the accumulative red-shift distribution can be used as a tool to constrain the progenitor characteristics of possible subclasses in L-GRBs.

참고문헌 (Reference)

1 C. Kouveliotou, 413 : L101-, 1993

2 S. E. Woosley, 405 : 273-, 1993

3 P. A. Mazzali, 442 : 1018-, 2006

4 E. Pian, 442 : 1011-, 2006

5 S. Campana, 442 : 1008-, 2006

6 T. R. Young, 442 : 992-, 2006

7 N. Gehrels, 444 : 1044-, 2006

8 A. I. MacFadyen, 524 : 262-, 1999

9 J. E. McClintock, 652 : 518-, 2006

10 R. Shafee, 636 : L113-, 2006

11 G. E. Brown, 5 : 191-, 2000

12 C.-H. Lee, 575 : 996-, 2002

13 D. Eichler, 340 : 126-, 1989

14 R. Narayan, 395 : L83-, 1992

15 E. Nakar, 442 : 166-, 2007

16 N. Gehrels, 437 : 851-, 2005

17 D. B. Fox, 437 : 845-, 2005

18 J. S. Bloom, 638 : 354-, 2006

19 J. K. Prochaska, 3700 (3700): 2005

20 S. Covino, 447 : L5-, 2006

21 E. Berger, 438 : 988-, 2005

22 E. Berger, 836 : 33-, 2006

23 A. M. Soderberg, 650 : 261-, 2006

24 J. S. Bloom, 654 : 878-, 2007

25 E. Nakar, 650 : 281-, 2006

26 J. Strnad, 24 : L11-, 2003

27 C. Porciani, 548 : 522-, 2001

28 E. J. Copeland, 15 : 1753-, 2006

29 H. A. Bethe, 442 : 5-, 2007

30 C.-H. Lee, 670 (670): 2007

31 A. S. Fruchter, 441 : 463-, 2006

32 "http://swift.gsfc.nasa.gov/docs/swift/archive/grb table.html"

33 A. Gal-Yam, "arXiv:astro-ph/0509891"

34 T. Chattopadhyay, "arXiv:0705.4020"

35 Hyun Kyu Lee, "Poynting Flux out of a Rotating Black Hole and Accretion Flow through a Force-Free Magnetosphere" 한국물리학회 49 (49): 1798-1804, 2006

36 Chang-Hwan Lee, "Double Neutron Star Binaries: Implications for LIGO" 한국물리학회 49 (49): 803-807, 2006

37 Norita Kawanaka, "A Neutrino-Cooled Accretion Disk as the Central Engine of Gamma-ray Bursts" 한국물리학회 49 (49): 1827-1829, 2006