SIMULTANEOUS OBSERVATIONS OF GIANT PULSES FROM THE CRAB PULSAR, WITH THE MURCHISON WIDEFIELD ARRAY AND PARKES RADIO TELESCOPE: IMPLICATIONS FOR THE GIANT PULSE EMISSION MECHANISM

被引：12

作者：

Oronsaye, S. I. ^{[1
,2
]}

Ord, S. M. ^{[1
,2
]}

Bhat, N. D. R. ^{[1
,2
]}

Tremblay, S. E. ^{[1
,2
]}

McSweeney, S. J. ^{[1
]}

Tingay, S. J. ^{[1
,2
]}

van Straten, W. ^{[2
,3
]}

Jameson, A. ^{[2
,3
]}

Bernardi, G. ^{[4
,5
,6
]}

Bowman, J. D. ^{[7
]}

Briggs, F. ^{[8
]}

Cappallo, R. J. ^{[9
]}

Deshpande, A. A. ^{[10
]}

Greenhill, L. J. ^{[5
]}

Hazelton, B. J. ^{[11
]}

Johnston-Hollitt, M. ^{[12
]}

Kaplan, D. L. ^{[13
]}

Lonsdale, C. J. ^{[9
]}

McWhirter, S. R. ^{[9
]}

Mitchell, D. A. ^{[2
,14
]}

Morales, M. F. ^{[11
]}

Morgan, E. ^{[15
]}

Oberoi, D. ^{[16
]}

Prabu, T. ^{[10
]}

Shankar, N. Udaya ^{[10
]}

Srivani, K. S. ^{[10
]}

Subrahmanyan, R. ^{[2
,10
]}

Wayth, R. B. ^{[1
,2
]}

Webster, R. L. ^{[2
,17
]}

Williams, A. ^{[1
]}

Williams, C. L. ^{[15
]}

机构：

[1] Curtin Univ, ICRAR, Bentley, WA 6102, Australia

[2] ARC Ctr Excellence All Sky Astrophys CAASTRO, Sydney, NSW, Australia

[3] Swinburne Univ Technol, Ctr Astrophys & Supercomp, Hawthorn, Vic 3122, Australia

[4] SKASA, ZA-7405 Pinelands, South Africa

[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[6] Rhodes Univ, Dept Phys & Elect, ZA-6140 Grahamstown, South Africa

[7] Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ 85287 USA

[8] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia

[9] MIT, Haystack Observ, Westford, MA 01886 USA

[10] Raman Res Inst, Bangalore 560080, Karnataka, India

[11] Univ Washington, Dept Phys, Seattle, WA 98195 USA

[12] Victoria Univ Wellington, Sch Chem & Phys Sci, Wellington 6140, New Zealand

[13] Univ Wisconsin, Dept Phys, Milwaukee, WI 53201 USA

[14] CASS, Epping, NSW 1710, Australia

[15] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[16] Tata Inst Fundamental Res, Natl Ctr Radio Astrophys, Pune 411007, Maharashtra, India

[17] Univ Melbourne, Sch Phys, Parkville, Vic 3010, Australia

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 809卷 / 01期

基金：

美国国家科学基金会; 澳大利亚研究理事会;

关键词：

ISM: individual objects (Crab Nebula); ISM: structure; pulsars: general; pulsars: individual (Crab pulsar); scattering; NEBULA PULSAR; INTERSTELLAR SCINTILLATION; STATISTICAL PROPERTIES; NP; 0532; UNIVERSE; SCATTERING; SPECTRA; VARIABILITY; FREQUENCIES; DISPERSION;

D O I：

10.1088/0004-637X/809/1/51

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on observations of giant pulses from the Crab pulsar performed simultaneously with the Parkes radio telescope and the incoherent combination of the Murchison Widefield Array (MWA) antenna tiles. The observations were performed over a duration of approximately one hour at a center frequency of 1382 MHz with 340 MHz bandwidth at Parkes, and at a center frequency of 193 MHz with 15 MHz bandwidth at the MWA. Our analysis has led to the detection of 55 giant pulses at the MWA and 2075 at Parkes above a threshold of 3.5 sigma and 6.5 sigma, respectively. We detected 51% of the MWA giant pulses at the Parkes radio telescope, with spectral indices in the range of -3.6 > alpha > -4.9 (S-nu alpha nu(alpha)). We present a Monte Carlo analysis supporting the conjecture that the giant pulse emission in the Crab is intrinsically broadband, the less than 100% correlation being due to the relative sensitivities of the two instruments and the width of the spectral index distribution. Our observations are consistent with the hypothesis that the spectral index of giant pulses is drawn from normal distribution of standard deviation 0.6, but with a mean that displays an evolution with frequency from -3.00 at 1382 MHz, to -2.85 at 192 MHz.

引用

页数：10

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