STIS Near Ultraviolet Time-Tagged Spectra of the Crab Pulsar

Details STIS Near Ultraviolet Time-Tagged Spectra of the Crab Pulsar STIS Near Ultraviolet Time-Tagged Spectra of the Crab Pulsar

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aas...19111114g&link_type=abstract

American Astronomical Society, 191st AAS Meeting, #111.14; Bulletin of the American Astronomical Society, Vol. 29, p.1392

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Scientific paper

We present the spectrum and pulse profile of the Crab Pulsar in the near ultraviolet (1600-3200 Angstroms) with the Space Telescope Imaging Spectrograph (STIS) during the Hubble Space Telescope (HST) Second Servicing Mission Orbital Verification (SMOV) period. The two-dimensional Near Ultraviolet Multi-Anode Microchannel Array (NUV-MAMA) was used in time-tag mode with a 2arcsec x 2arcsec aperture and the low dispersion grating, G230L, to obtain a three dimensional data cube in detector coordinates and time. The internally derived pulse period is consistent with radio measurements, and the pulse profile agrees well with previous near ultraviolet broadband measurements by the High Speed Photometer. The pulsar spectrum includes the 2200 Angstroms diffuse feature, plus several interstellar absorption lines. Dereddening the spectrum using the Savage-Mathis model with E(B-V)=0.55 +/- 0.05 leads to a good fit to a power law with slope alpha _ν= -0.3 +/- 0.2 . Spectra of the primary pulse, the interpulse, the individual rising edges and falling edges are similar to the total spectrum to the limits of photon statistics. Breaking the spectrum into 200 Angstroms bins and comparing the pulse and interpulse profiles shows the profiles to be stable across the NUV spectral range. Histogram analysis reveals no evidence for giant pulses as seen at radio wavelengths.

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