2018/09/30 by R. Mignani, R. P. Mignani, A. Shearer +12 · 15 citations
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Crab Pulsar #Galaxy #Hubble space telescope #Infrared #Large Magellanic Cloud #Light curve #Nebula #Optics #Physics #Pulsar #Pulsar wind nebula #Pulsars and Gravitational Waves Research #Space Telescope Imaging Spectrograph #Spectral index #Spectral line #Stars #Stellar, planetary, and galactic studies #Ultraviolet #Wavelength #astro-ph.HE
paper · pdf · doi:10.3847/1538-4357/aafb04
published in The Astrophysical Journal 871(2), 246 (IOP Publishing) · 33 pages, 6 figures, accepted for publication on ApJ
arxiv created 2018/12/27 · openalex publication_date 2019/02/01 · arxiv updated 2019/02/13 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Abstract We observed the young (∼1700 yr) pulsar PSR B0540−69 in the ultraviolet for the first time with the Space Telescope Imaging Spectrograph on board the Hubble Space Telescope . Imaging observations with the NUV-MAMA and ultraviolet FUV-MAMA detectors in TIME-TAG mode allowed us to clearly detect the pulsar in two bands around 2350 and 1590 Å, with magnitudes m NUV = 21.45 ± 0.02 and m FUV = 21.83 ± 0.10. We also detected the pulsar wind nebula in the NUV-MAMA image, with a morphology similar to that observed in the optical and near-infrared (IR). The extinction-corrected NUV and FUV pulsar fluxes are compatible with a very steep power-law spectrum with spectral index α UV ∼ 3, and incompatible with a Rayleigh–Jeans spectrum, indicating a non-thermal origin of the emission. The comparison with the optical/near-IR power-law spectrum (spectral index α O,nIR ∼ 0.7), indicates an abrupt turnover at wavelengths below 2500 Å, not yet observed in other pulsars. We detected pulsations in both the NUV and FUV data at the 50 ms pulsar period. In both cases, the folded light curve features a broad pulse with two peaks closely spaced in phase, as observed in the optical and X-ray light curves. The NUV/FUV peaks are also aligned in phase with those observed in the radio (1.4 GHz), optical, X-ray, and γ -ray light curves, as in the Crab pulsar, implying a similar beaming geometry across all wavelengths. PSR B0540−69 is now the fifth isolated pulsar, together with Crab, Vela, PSR B0656+14, and the radio-quiet Geminga, detected in the optical, UV, near-IR, X-rays, and γ -rays, and seen to pulsate in at least four of these energy bands.