Detection of giant component

from pulsar PSR J0653+8051

V.M. Malofeev, D.A. Teplykh, O.I. Malov and S.V. Logvinenko

Pushchino Radio Astronomy Observatory ASC LPI RAS

Observations of B0643+8051 in 1996

Malofeev et al., 1998

Observations

LPA: 111.5 ± 1.5 МHz,

3.3 m / cos , Aef 20 000 m2

Digital receiver: 512 5 kHz, t =2.45; 5.12 ms

Apr.2012 – Apr.2014

360 observation sessions

1 observation session = 994 periods

B0643+80 (J0653+8051)

p = 1,214 s

p' = 3,8 10-15 s/s

T = 5 106 years

B = 2 1012 G

DM = 32,5 pc/cm3

Examples of integrated profiles

22.03.2013

S/n < 3

26.5%

31.12.2012

3 < S/n < 5

62%

12.12.2012

S/n > 5

12%Inte

nsi

ty in

arb

itra

ry u

nits

Pulse longitude (samples)

1.08.2013

S/n > 10

0,4%

The fluctuations of the component intensity

C1

C2

C30246810121416182022242628

562

35

562

39

562

43

562

47

562

51

562

55

562

59

562

63

562

67

562

71

562

75

562

79

562

83

562

87

562

91

562

95

562

99

563

03

563

07

563

11

563

15

563

19

563

23

563

27

563

31

563

35

563

39

563

43

563

47

563

51

563

55

563

59

563

63

563

67

563

71

563

75

563

79

563

83

563

87

563

91

563

95

563

99

564

03

564

07

564

11

564

15

564

19

564

23

564

27

564

31

564

35

564

39

564

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564

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564

51

564

55

564

59

564

63

564

67

564

71

564

75

564

79

564

83

564

87

564

91

564

95

564

99

565

03

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07

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51

Pulsar

Components

SNR

MJD

J0653+8051

C1 C2 C3

The fluctuations of the component intensity

Outburst (1.08.2013)

Sum of 408 double periods

Integrated pulse profile

Sum of 816 pulses

Inte

nsi

ty

Inte

nsi

ty

Fre

qu

en

cy

Pulse longitude (samples)

Outburst (1.08.2013)

Sum of 378 pulses: S/n(C2) < 5

Sum of 31 pulses: S/n(C1, C3) > 2,5,

S/n(C2) < 5

Sum of 32 pulses: S/n > 5

C1 C2 C3

Inte

nsi

ty in

arb

itra

ry u

nit

s

Inte

nsi

ty

Pulse longitude (samples) = 80 deg

158 pulses (C2 – 134) S/n ≥ 2.5

56 pulses (C2 – 56) S/n ≥ 5

16 pulses (C2 – 16) S/n ≥ 10

Intensity variations of pulses during “outburst” sessions

Pu

lse

nu

mb

er

Pulse longitude in sample(1 sample = 5,12 ms)

Double period

Pu

lse

nu

mb

er

Pulse longitude in sample(1 sample = 5,12 ms)

Double period

24.05.2012 1.08.2013

Intensity variations of pulses during session of 24.05.2012

Pu

lse

nu

mb

er

Pulse longitude in sample(1 sample = 5,12 ms)

Double period

C1 C2 C3

Sum of 439 double pulses

Sum of 30 double pulses

Sum of 495 double pulses

The examples of the

individual pulses

(1.08.2013)

C1 C2 C3

Inte

nsi

ty in

arb

itra

ry u

nit

s

Pulse longitude (samples) = 80 deg

The dispersion slope in time-frequency plane

fre

qu

en

cy

Time (2 periods)

16 pulses

Nature of events

Mode-switching – NO (very rare event)

Giant pulses – NO (very wide pulses ~ 10 ms)

RRATs (McLaughlin et al., 2006) – POSSIBLE

Duration of pulses is 2 – 30 ms and burst rates ranging: 0,4 – 0,01%

We have 20 pulses with 𝐼

𝐼≥ 100 (S/n ≥ 10), total number of pulses is ~105 and

our bursts rates is 0.01%.

Bright radio burst of B0656+14 (Weltevrede et al., 2006) has wide emission

window ~ 40o, B0643+80 has emission window ~ 5o.

Core emission - ? (Empirical model core-cone emission by J.Rankin)

Giant component - ?

Summary

We confirmed the presence of the bursts in second component of

three-components profile (Malofeev et al., 1998)

We detected that intensity of this component can be a factor 170

higher than its mean value. The duration of the bursts is about 300

periods (~6 min) and such event is extremely rare ~ 0.01% of

observing time

We find the long-time (a few months) variation of intensity of all

components, then this value changed in two times with the

average intensity of pulse emission.