Optical Spectrum of Main‐, Inter‐, and Off‐Pulse Emission from the Crab Pulsar | Zendy

A. Carramiñana | Zendy; A. Čadež | Zendy; T. Zwitter | Zendy

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Optical Spectrum of Main‐, Inter‐, and Off‐Pulse Emission from the Crab Pulsar

Author(s) -

A. Carramiñana,

A. Čadež,

T. Zwitter

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/317063

Subject(s) - pulsar , physics , nebula , astrophysics , crab pulsar , emission spectrum , crab nebula , spectral line , astronomy , spectral index , pulse (music) , flux (metallurgy) , line (geometry) , optics , stars , geometry , mathematics , materials science , detector , metallurgy

A dedicated stroboscopic device was used to obtain optical spectra of theCrab main-pulse and inter-pulse as well as the spectrum of the underlyingnebula when the pulsar is turned off. As the nebular emission is veryinhomogeneous, our ability to effectively subtract the nebular backgroundsignal is crucial. No spectral lines intrinsic to the pulsar are detected. The main-pulse andthe inter-pulse behave as power laws, both with the same de-reddened indexAlpha = +0.2 +- 0.1. This value was obtained by subtracting the nebularspectrum at the exact position of the pulsar. The underlying nebula is redder,Alpha = -0.4 +- 0.1. Its emission lines are split into approaching (sim. -1200km/s) and receding (sim. +600 km/s) components. The strength of emission linecomponents and the flux in nebular continuum vary on arcsec scale. The nebularline and continuum intensities along the N-S slit are given.Comment: Accepted for publication in the Astrophysical Journal. 10 pages, 3 Tables, 4 Figure

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