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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 of New Gamma-ray
Pulsars Discovered by Fermi LAT
  • Nobuyuki Kawai and Yoshikazu Kanai
  • (Tokyo Tech)
  • On behalf of Fermi/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 from timing analysis
Preliminary
95 error in our 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 from temporal analysis
0.5 2 keV 2 10 keV
Preliminary
95 error in our 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 pulsars include pulsars
Suzaku observed, Geminga and the new pulsar in
CTA 1 (meaning no radio detection 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 ongoing with
Chandra and XMM-Newton
16
(No Transcript)
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