EVIDENCE FOR A PHOTOSPHERIC COMPONENT IN THE PROMPT EMISSION OF THE SHORT GRB 120323A AND ITS EFFECTS ON THE GRB HARDNESS-LUMINOSITY RELATION

被引：126

作者：

Guiriec, S. ^{[1
]}

Daigne, F. ^{[2
,3
]}

Hascoet, R. ^{[2
,3
]}

Vianello, G. ^{[4
,5
]}

Ryde, F. ^{[6
,7
]}

Mochkovitch, R. ^{[2
,3
]}

Kouveliotou, C. ^{[8
]}

Xiong, S. ^{[9
]}

Bhat, P. N. ^{[9
]}

Foley, S. ^{[10
]}

Gruber, D. ^{[11
]}

Burgess, J. M. ^{[9
]}

McGlynn, S. ^{[10
]}

McEnery, J. ^{[1
,12
,13
]}

Gehrels, N. ^{[1
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[2] Univ Paris 06, Inst Astrophys Paris, UMR 7095, F-75014 Paris, France

[3] CNRS, F-75014 Paris, France

[4] Stanford Univ, Dept Phys, Kavli Inst Particle Astrophys & Cosmol, WW Hansen Expt Phys Lab, Stanford, CA 94305 USA

[5] Stanford Univ, SLAC Natl Accelerator Lab, Stanford, CA 94305 USA

[6] AlbaNova, Royal Inst Technol, Dept Phys, SE-10691 Stockholm, Sweden

[7] AlbaNova, Oskar Klein Ctr Cosmo Particle Phys, SE-10691 Stockholm, Sweden

[8] NASA, George C Marshall Space Flight Ctr, Off Sci & Technol, Huntsville, AL 35812 USA

[9] Univ Alabama, NSSTC, Huntsville, AL 35805 USA

[10] Univ Coll Dublin, UCD Sch Phys, Dublin 4, Ireland

[11] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

[12] Univ Maryland, Dept Phys, College Pk, MD 20742 USA

[13] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

来源：

ASTROPHYSICAL JOURNAL | 2013年 / 770卷 / 01期

关键词：

acceleration of particles; cosmology: miscellaneous; gamma-ray burst: individual (GRB 120323A); gamma rays: stars; radiation mechanisms: non-thermal; radiation mechanisms: thermal; GAMMA-RAY BURST; PEAK ENERGY; FERMI OBSERVATIONS; THERMAL EMISSION; SPECTRAL CATALOG; BATSE OBSERVATIONS; INTERNAL SHOCKS; EVOLUTION; JETS; ACCELERATION;

D O I：

10.1088/0004-637X/770/1/32

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The short GRB 120323A had the highest flux ever detected with the Gamma-Ray Burst Monitor on board the Fermi Gamma-Ray Space Telescope. Here we study its remarkable spectral properties and their evolution using two spectral models: (1) a single emission component scenario, where the spectrum is modeled by the empirical Band function (a broken power law), and (2) a two-component scenario, where thermal (a Planck-like function) emission is observed simultaneously with a non-thermal component (a Band function). We find that the latter model fits the integrated burst spectrum significantly better than the former, and that their respective spectral parameters are dramatically different: when fit with a Band function only, the E-peak of the event is unusually soft for a short gamma-ray burst (GRB; 70 keV compared to an average of 300 keV), while adding a thermal component leads to more typical short GRB values (E-peak similar to 300 keV). Our time-resolved spectral analysis produces similar results. We argue here that the two-component model is the preferred interpretation for GRB 120323A based on (1) the values and evolution of the Band function parameters of the two component scenario, which are more typical for a short GRB, and (2) the appearance in the data of a significant hardness-intensity correlation, commonly found in GRBs, when we employee two-component model fits; the correlation is non-existent in the Band-only fits. GRB 110721A, a long burst with an intense photospheric emission, exhibits the exact same behavior. We conclude that GRB 120323A has a strong photospheric emission contribution, observed for the first time in a short GRB. Magnetic dissipation models are difficult to reconcile with these results, which instead favor photospheric thermal emission and fast cooling synchrotron radiation from internal shocks. Finally, we derive a possibly universal hardness-luminosity relation in the source frame using a larger set of GRBs (L-i(Band) = (1.59 +/- 0.84) x 10(50)(E (rest)(peak,i))(1.33 +/- 0.07) erg s(-1)), which could be used as a possible redshift estimator for cosmology.

引用

页数：25

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