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X-ray Observations of New Gamma-ray Pulsars Discovered by Fermi LAT

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(2) Gamma-ray studies cannot find any differences. between radio-loud and radio-quiet pulsars ... Only one target lacks obvious counterpart... Nearby source is ... – PowerPoint PPT presentation

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Title: X-ray Observations of New Gamma-ray Pulsars Discovered by Fermi LAT


1
X-ray Observations ofNew Gamma-ray
PulsarsDiscovered by Fermi LAT
  • Nobuyuki Kawaiand Yoshikazu Kanai
  • (Tokyo Tech)
  • On behalf ofFermi/LAT Collaboration

2
Motivation
  • Fermi LAT detected 55 pulsars including 24 new
    ones
  • X-ray observations are essential for those
    newcomers

(1) X-ray counterparts can give unique
information of precise positions in the sky
if the sources cannot be found in the radio
survey (2) Gamma-ray studies cannot find any
differences between radio-loud and
radio-quiet pulsars but how about X-ray
properties?
3
Suzaku Observations
  • - 12 pulsars, 280 ks in total for AO4
  • XIS nominal position
  • No window/burst/timing option- Detecting
    pulsation is NOT aimed
  • 9 pulsars observed as of today

4
Observed Pulsars
5
Observed Pulsars
- Position in the all-sky map
6
PSR J06330632 - Images
XIS03
0.5 2 keV 2 10 keV
3s error fromtiming analysis
Preliminary
95 error inour latest catalog
7
PSR J06330632 - Images
XIS03
0.5 2 keV 2 10 keV
Background
Source
Preliminary
8
PSR J06330632 Spectrum
- Absorbed power-law model is the best
Preliminary
NH lt 4 x 1020 cm-2 G 1.52 cn2 74.73 / 77
0.09 0.08
9
PSR J035732 - Images
XIS03
3s error fromtemporal analysis
0.5 2 keV 2 10 keV
Preliminary
95 error inour latest catalog
10
PSR J035732 - Images
XIS03
0.5 2 keV 2 10 keV
Background
Source
Preliminary
11
PSR J035732 - Spectrum
- Absorbed power-law model is the best
Preliminary
NH lt 6 x 1021 cm-2 G 1.87 cn2 22.23 / 19
0.53 0.41
12
Results Overview
  • X-ray counterparts are found for most of the
    targets
  • Only one target lacks obvious counterpart...
    Nearby source is analyzed
  • PL or PL BB model is preferred

Preliminary
  • Known radio pulsars
  • are radio pulsars
  • Detected by Fermi LAT
  • and
  • Studied in X-ray band.
  • Including 5 EGRET PSRs

Distribution of photon index similar to known
pulsars.
Fermi LAT pulsarsinclude pulsars
Suzakuobserved, Geminga andthe new pulsar in
CTA 1(meaning no radiodetection or radio quiet)
13
Distance Estimation to Calculate X-ray Luminosity
Pulsar Catalog paper(Abdo et al., ApJ submitted)
14
Spin-down Luminosity vs X-ray Luminosity
Lx distribution
Preliminary
Crab
Preliminary
Fermi LAT can find fainter PSRs
More complete population studies
15
Summary
  • We are observing Fermi LAT pulsars with Suzaku
  • Faint X-ray counterparts are found for most of
    targets
  • Power-law component found for all sources
  • Properties similar to those of gamma-ray
    pulsars with radio emission

Further X-ray observations are ongoingwith
Chandra and XMM-Newton
16
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