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
43
564
47
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
565
07
565
11
565
15
565
19
565
23
565
27
565
31
565
35
565
39
565
43
565
47
565
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.
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