| Attributs | Valeurs |
|---|
| type
| |
| Is Part Of
| |
| Subject
| |
| Title
| - The near-UV pulse profile and spectrum of the pulsar PSR B0656+14
|
| Date
| |
| has manifestation of work
| |
| related by
| |
| Author
| |
| Abstract
| - We have observed the middle-aged pulsar PSR B0656+14 with the prism and the NUV MAMA detector of the Space Telescope Imaging Spectrograph (STIS) to measure the pulsar spectrum and periodic pulsations in the near-ultraviolet (NUV). The pulsations are clearly detected, double-peaked and very similar to the optical pulse profile. The NUV pulsed fraction is $70\pm12$%. The spectral slope of the dereddened phase-integrated spectrum in the ~ $1800{-}3200$ Å range is ~ $\alpha_{u}=0.35\pm0.5$ which together with the high pulse fraction indicates a non-thermal origin for the NUV emission. The total flux in the range ~ $1700{-}3400$ Å is estimated to be $3.4\pm0.3\times10^{-15}$ erg s -1 cm -2 when corrected for $E(B-V)=0.03$ mag. At a distance of 288 pc this corresponds to a luminosity $L_{\rm NUV}=3.4\times10^{28}$ erg s -1 assuming isotropy of the emission. We compare the NUV pulse profile with observations from radio to gamma-rays. The first NUV sub-pulse is in phase with the gamma-ray pulse marginally detected with EGRET, while the second NUV sub-pulse is similar both in shape and in phase with the non-thermal pulse in hard X-rays. This indicates a single origin of the non-thermal emission in the optical-NUV and in the X-rays. This is also supported by the observed NUV spectral slope, which is compatible with a blackbody plus power-law fit extended from the X-ray range, but dominated by the power-law component in most of the NUV range.
|
| article type
| |
| publisher identifier
| |
| Date Copyrighted
| |
| Rights
| |
| Rights Holder
| |
| is part of this journal
| |
| is primary topic
of | |
