2004A&A...413.1065N


Query : 2004A&A...413.1065N

2004A&A...413.1065N - Astronomy and Astrophysics, volume 413, 1065-1072 (2004/1-3)

BeppoSAX observation of PSR B1937+21.

NICASTRO L., CUSUMANO G., LOEHMER O., KRAMER M., KUIPER L., HERMSEN W., MINEO T. and BECKER W.

Abstract (from CDS):

We present the results of a BeppoSAX observation of the fastest rotating pulsar known: PSR B1937+21. The ∼200ks observation (78.5ks MECS/34ks LECS on-source time) allowed us to investigate with high statistical significance both the spectral properties and the pulse profile shape. The pulse profile is clearly double peaked at energies >4keV. Peak widths are compatible with the instrumental time resolution and the second pulse lags the main pulse 0.52 in phase, like is the case in the radio. In the 1.3-4keV band we detect a ∼45% DC component; conversely the 4-10keV pulsed fraction is consistent with 100%. The on-pulse spectrum is fitted with an absorbed power-law of spectral index ∼1.2, harder than that of the total flux which is ∼1.9. The total unabsorbed (2-10keV) flux is F2–10=4.1x10–13erg/cm2/s, implying a luminosity of LX=5.0x1031Θ(d/3.6kpc)2erg/s and a X-ray efficiency of η=4.5x10–5Θ, where Θ is the solid angle spanned by the emission beam. These results are in agreement with those obtained by ASCA and a more recent Rossi-XTE observation. The hydrogen column density NH∼2x1022/cm2 is ∼10 times higher than expected from the radio dispersion measure and average Galactic density of e. Though it is compatible (within 2 σ) with the Galactic (HI derived) value of ∼1x1022/cm2, inspection of dust extinction maps reveal that the pulsar falls in a highly absorbed region. In addition, 1.4GHz radio map shows that the nearby (likely unrelated) HII source 4C21.53W is part of a circular emission region ∼4' across.

Abstract Copyright:

Journal keyword(s): stars: neutron - stars: pulsars individual: PSR B1937+21 - X-rays: stars

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 PSR J0218+42 Psr 02 18 06.3604 +42 32 17.365           ~ 322 2
2 PSR B0540-69 Psr 05 40 10.84 -69 19 54.2           ~ 865 3
3 PSR B1112+50 Psr 11 15 38.400 +50 30 12.29           ~ 142 0
4 PSR J1824-2452A Psr 18 24 32.009 -24 52 11.10           ~ 474 2
5 PSR B1937+21 Psr 19 39 39.6 +21 37 22           ~ 1032 2
6 4C 21.53W HII 19 39 40.0 +21 37 28           ~ 16 0

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2023.02.02-19:40:18

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