Time-domain and spectral properties of pulsars at 154 MHz

被引：43

作者：

Bell, M. E. ^{[1
,2
]}

Murphy, Tara ^{[2
,3
]}

Johnston, S. ^{[1
]}

Kaplan, D. L. ^{[4
]}

Croft, S. ^{[5
,6
]}

Hancock, P. ^{[2
,7
]}

Callingham, J. R. ^{[1
,2
,3
]}

Zic, A. ^{[3
]}

Dobie, D. ^{[3
]}

Swiggum, J. K. ^{[4
]}

Rowlinson, A. ^{[8
,9
]}

Hurley-Walker, N. ^{[7
]}

Offringa, A. R. ^{[9
]}

Bernardi, G. ^{[10
,11
,12
]}

Bowman, J. D. ^{[13
]}

Briggs, F. ^{[14
]}

Cappallo, R. J. ^{[15
]}

Deshpande, A. A. ^{[16
]}

Gaensler, B. M. ^{[2
,3
,17
]}

Greenhill, L. J. ^{[12
]}

Hazelton, B. J. ^{[18
]}

Johnston-Hollitt, M. ^{[19
]}

Lonsdale, C. J. ^{[15
]}

McWhirter, S. R. ^{[15
]}

Mitchell, D. A. ^{[1
,2
]}

Morales, M. F. ^{[18
]}

Morgan, E. ^{[5
]}

Oberoi, D. ^{[19
]}

Ord, S. M. ^{[2
,7
]}

Prabu, T. ^{[16
]}

Shankar, N. Udaya ^{[16
]}

Srivani, K. S. ^{[16
]}

Subrahmanyan, R. ^{[2
,16
]}

Tingay, S. J. ^{[2
,7
]}

Wayth, R. B. ^{[2
,7
]}

Webster, R. L. ^{[2
,20
]}

Williams, A. ^{[7
]}

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

机构：

[1] CSIRO Astron & Space Sci, POB 76, Epping, NSW 1710, Australia

[2] Univ Sydney, ARC Ctr Excellence All Sky Astrophys CAASTRO, Sydney, NSW 2006, Australia

[3] Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia

[4] Univ Wisconsin, Dept Phys, 1900 E Kenwood Blvd, Milwaukee, WI 53211 USA

[5] Univ Calif Berkeley, Dept Astron, 501 Campbell Hall 3411, Berkeley, CA 94720 USA

[6] Eureka Sci Inc, 2452 Delmer St Suite 100, Oakland, CA 94602 USA

[7] Curtin Univ, Int Ctr Radio Astron Res, Bentley, WA 6845, Australia

[8] Univ Amsterdam, Anton Pannekoek Inst, Postbus 94249, NL-1090 GE Amsterdam, Netherlands

[9] Netherlands Inst Radio Astron ASTRON, POB 2, NL-7990 AA Dwingeloo, Netherlands

[10] SKA SA, 3rd Floor,Pk Rd, ZA-7405 Pinelands, South Africa

[11] Rhodes Univ, Dept Phys & Elect, POB 94, ZA-6140 Grahamstown, South Africa

[12] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

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

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

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

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

[17] Univ Toronto, Dunlap Inst Astron & Astrophys, Toronto, ON M5S 3H4, Canada

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

[19] Victoria Univ Wellington, Sch Chem & Phys Sci, POB 600, Wellington 6140, New Zealand

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

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2016年 / 461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：

pulsars: general; radio continuum: stars; MURCHISON WIDEFIELD ARRAY; LONG-TERM SCINTILLATION; FLUX-DENSITY; INTERSTELLAR SCATTERING; GIANT PULSES; RADIO; SKY; DISCOVERY; EMISSION; J0437-4715;

D O I：

10.1093/mnras/stw1293

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present 154 MHz Murchison Widefield Array imaging observations and variability information for a sample of pulsars. Over the declination range -80 degrees < delta < 10 degrees, we detect 17 known pulsars with mean flux density greater than 0.3 Jy. We explore the variability properties of this sample on time-scales of minutes to years. For three of these pulsars, PSR J0953+0755, PSR J0437-4715, and PSR J0630-2834, we observe interstellar scintillation and variability on time-scales of greater than 2 min. One further pulsar, PSR J0034-0721, showed significant variability, the physical origins of which are difficult to determine. The dynamic spectra for PSR J0953+0755 and PSR J0437-4715 showdiscrete time and frequency structure consistent with diffractive interstellar scintillation and we present the scintillation bandwidth and timescales from these observations. The remaining pulsars within our sample were statistically non-variable. We also explore the spectral properties of this sample and find spectral curvature in pulsars PSR J0835-4510, PSR J1752-2806, and PSR J0437-4715.

引用

页码：908 / 921

页数：14

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