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A young pulsar with a long radio trail emergA young pulsar with a long radio trail emerging from SNR G315.9-0.0ing from SNR G315.9-0.0
F. Camilo, C.-Y. NG et al.
arxiv :0908.2421v1
Page 2
目录
Introduction
Discussion
Observations and results
Page 3
Introduction
Frying pan SNR G315.9-0.0
contour 2.5 5 7.5
10 15 and 20mJy
Shell ~13'
Jet like tail ~8' no IR
counterpart
Mills 1981 MOST@843MHz
Page 4
MOST @843MHzWhiteoak&Green 1996
Page 5
Observations and results
Image fromATCA 2.4 GHz
ATNF Parkes2008 June 17 6.1 hr @1374MHzwith 288MHz BW
Page 6
Identified pulsar PSR J1437-595
9
P~61ms
DM=549pc cm-3
D~8kpc(from Cordes&Lazio NE2
001 electron density model)
~50% linearly polarized througho
ut the pulse profile
Page 7
Page 8
9.6ks Swift observation on 2008 July 5
only one photon within 5" of the pulsar position
NH =1.6 × 1022 cm−2
photon index Γ = 1.5
assume 5 photons as the limit
fX < 4.5 × 10−14 erg cm−2 s−1
LX < 3.5 × 1032 d8^2 erg s−1
LX / Edot < 2.5 × 10−4 d8^2
Page 9
Discussion
Suggesting PSR association with the SNR NE2001 model uncertainty for the system~25%
d8 = 1 ± 0.25 τc = 114 kyr
τ114 = τ/τc
Vt = 300 d8/τ114 km s−1
RSNR = 17 d8 pc the SNR shell radius is small for such the age 114 kyr
Page 10
Sedov solution constraints on age τ≈ 22 d8
5/2(n0/E51)1/2 kyr
hydrogen ambient medium density n0cm-3
SN explosion kinetic energy 1051E51
Page 11
Other constraints on age
the trail ~RSNR = 17 d8 pc τc = 114 kyr
The pulsar wind trail collimated for about 50kyr. Detailed study of PWN will find if it's resonable.(under way using ATCA)
If τ114 = τ/τc<<1, e.g. τ114∽0.2, Vt≈ 1500 km s−1
The proper motion is µ = 8/τ114 mas yr−1 , this could be measurable with the ATCA.
Page 12
PSR J1437–5959 has a very small flux density
luminosity L1.4 ≡ S1.4d2≈5d8^2 mJy kpc2
now unremarkable following numerous young pulsar disc
overies in recent years
Parkes multibeam survey 1997(Manchester et al. 2001)
Page 13
the faint tail of the population remains out of reach in a significant Galactic volume
谢谢观赏谢谢观赏