A fundamental plane for long gamma-ray bursts with X-ray plateaus
- Department of Physics and Astronomy, Stanford University, Via Pueblo Mall 382, Stanford CA, 94305-4060 (United States)
- The Center for Exploration of Energy and Matter, Indiana University, Bloomington, IN 47405 (United States)
- Instituto de Astronomía, Universidad Nacional Autónoma de México, Ciudad de México 04510, México (Mexico)
A class of long gamma-ray bursts (GRBs) presenting light curves with an extended plateau phase in their X-ray afterglows obeys a correlation between the rest-frame end-time of the plateau, T {sub a}, and its corresponding X-ray luminosity, L {sub a}, (Dainotti et al). In this work we perform an analysis of a total sample of 176 Swift GRBs with known redshifts, exhibiting afterglow plateaus. By adding a third parameter that is the peak luminosity in the prompt emission, L {sub peak}, we discover the existence of a new three-parameter correlation. The scatter of data about this plane becomes smaller when a class-specific GRB sample is defined. This sample of 122 GRBs is selected from the total sample by excluding GRBs with associated supernovae (SNe), X-ray flashes and short GRBs with extended emission. With this sample the three-parameter correlation identifies a GRB “fundamental plane.” Moreover, we further limit our analysis to GRBs with light curves with good data coverage and almost flat plateaus, 40 GRBs forming our “gold sample.” The intrinsic scatter, σ{sub int}=0.27±0.04, for the three-parameter correlation for this last sub-class is more than two times smaller than the value for the L{sub a}−T{sub a} one, making this the tightest three-parameter correlation that involves the afterglow plateau phase. Finally, we also show that a slightly less tight correlation is present between L {sub peak} and a proxy for the total energy emitted during the plateau phase, L{sub a}T{sub a}, confirming the existence of an energy scaling between the prompt and afterglow phases.
- OSTI ID:
- 22868925
- Journal Information:
- Astrophysical Journal Letters, Vol. 825, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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