Radio Emission from Radio Emission from RRAT J1819-14 at RRAT J1819-14 at Low FrequenciesLow Frequencies
Teplykh D., Malofeev V., Logvinenko S.
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Neutron starsNeutron stars
Rns ~ 10 kmMns ~ M
Bns ~ 1012 — 1013 Gp ~ ms - s
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Anomalous pulsarsAnomalous pulsarsGemingaAnomalous X-ray pulsars (AXPs)Soft gamma-ray repeaters(SGRs)X-ray dim isolated neutron stars (XDINSs)Compact X-ray objects in remnant of
supernova (CCO)Transient pulsars: - Rotating radio transients (RRATs) - switch off (B1931+24)
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RRATsRRATs
• These sources are characterized by the emission of bursts with duration 2–30 ms.
• The maximum burst flux density is 0.1– 4 Jy.• The mean interval between bursts is 4 min–3
hrs• The 10 of 11 sources have periods in the range
0.4–7 s. And the period derivative ˙P was measured for 3 pulsars.
• The inferred magnetic fields are in the 1012 – 1014 G, and ages of these objects are 0.1–3 Myrs.
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RRATsRRATs Name P, s w50, ms dP/dt, 10-15 DM D,kpc S1400, mJy Np /Tobs
J0848-43 5.97748(2) 30 293(19) 5.5 100 27/19
J1317-5759 2.6421979742(3) 10 12.6(7) 145.4(3) 3.2 1100 108/24
J1443-60 4.758565(5) 20 369(8) 5.5 280 32/41
J1754-30 0.422617(4) 16 98(6) 2.2 160 18/30
J1819-1458 4.263159894(6) 3 576(1) 196(3) 3.6 3600 229/13
J1826-14 0.7706187(3) 2 159(1) 3.3 600 18/17
J1839-01 0.93190(1) 15 307(10) 6.5 100 8/13
J1846-02 4.476739(3) 16 239(10) 5.2 250 11/10
J1848-12 6.7953(5) 2 88(2) 2.4 450 10/8
J1911+00 5 100(3) 3.3 250 4/13
J1913+1333 0.9233885242(1) 2 7.87(2) 175.8(3) 5.7 650 66/14
B1931+24 0.813690303 0.6 7.15-10.79
B0656+14 0.384885 2 55.01
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JJ1819-141819-145858
M.A.McLaughlin et al. Nature, 439, 817-820 (2006)
• - pulsars - magnetars - XDINS - RRATs
Burst observational signatures
The rotational properties of neutron stars
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ObservationsObservations
LPA: 111.5 ± 1.5 МHz, 3.3 m / cos , Aef 20 000 m2
Receivers: 96 20 kHz, 460 5 kHz t = 28.06 ms
J18J1819-1419-14 46 periods of pulsars were recorded during a single
observation session. On the whole 33 observation sessions have been
made.
9-th GAMOW SUMMER SCHOOLLarge Phased ArrayLarge Phased Array
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JJ11331133+16+16010209_1133+16_00 SNR=28.0
Номер точки в окне480460440420400380360340320300280260240220200180160140120100806040200
Мощ
ност
ь
264
263
262
261
260
259
• S = 1000 mJy
• Р = 1,1 s• DM = 4,8• Δt = 2,56
ms
• 482 periods470 chan = 111.88 MHz
10 chan = 109.59MHz
at 111 at 111 MHzMHz
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BB2310+42310+422101108_2310+42_00 SNR=11.4
Номер точки в окне12512011511010510095908580757065605550454035302520151050
Мощ
ност
ь
523
522
521
• S = 110 mJy• Р = 0,35 s• DM = 17,3• Δt = 5,12
ms
• 375 groups
101108_2310+42_00 SNR=11.4
Номер точки в окне12512011511010510095908580757065605550454035302520151050
Мощ
ност
ь
523
522
521
Pulse phase (ms)
Rel
ativ
e fl
ux d
ensi
ty
470 chan = 111.88 MHz
10 chan = 109.59MHz
at 111 at 111 MHzMHz
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JJ1819-141819-14
• Sum of 4 days (January 2009)
• 49 pulses
Суммарный профиль
4,0003,5003,0002,5002,0001,5001,0005000
1.006
1.005
1.005
1.004
1.004
1.003
1.003
1.002
1.002
1.001
1.001
1
1
0.999
at 111 at 111 MHzMHz
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1819-1819-1414Суммарный профиль
4,0003,5003,0002,5002,0001,5001,0005000
1.006
1.005
1.005
1.004
1.004
1.003
1.003
1.002
1.002
1.001
1.001
1
1
0.999
• Sum of 4 days (January 2009)
• 49 pulses
• With compensation for DM = 196
at 111 at 111 MHzMHz
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1819-1819-1414Суммарный профиль
4,0003,5003,0002,5002,0001,5001,0005000
1.004
1.004
1.004
1.003
1.003
1.002
1.002
1.001
1.001
1
1
0.999
• Sum of 7 days• (January 2009)• 93 pulses
at 111 at 111 MHzMHz
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1819-1819-1414at 111 at 111
MHzMHz• Sum of 7 days(February - March 2009)
• 109 pulses
Суммарный профиль
4.0003.5003.0002.5002.0001.5001.0005000
1.006
1.0061.005
1.0051.004
1.0041.003
1.0031.002
1.0021.001
1.0011
10.999
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1819-1819-1414at 111 at 111
MHzMHz• Sum of 7 days(February - March 2009)
• 109 pulses
Суммарный профиль
4.0003.5003.0002.5002.0001.5001.0005000
1.006
1.0061.005
1.0051.004
1.0041.003
1.0031.002
1.0021.001
1.0011
10.999
With compensation for DM = 196
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Parameters of J1819-14 at 111 Parameters of J1819-14 at 111 MHzMHz
Sp(111) 17 Jy
w50 70 ms
Sp(1400) 0,4 Jy
1,5 (111-1400 MHz)
Ratio of the total number of bursts detected to the total observation time:
1400 MHz – 2%
111 MHz ~ 5%
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ConclusionsConclusions
• There is radio emission from RRAT J1819-14 at 111MHz.
• The ratio of the total number of bursts detected to the total observation time is close to the ratio at 1400 MHz.
• Spectral index ~ 1.5. It is close to the mean spectral index of normal
pulsars.
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