Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...474l..51m&link_type=abstract
Astrophysical Journal Letters v.474, p.L51
Astronomy and Astrophysics
Astronomy
39
Stars: Neutron, Stars: Pulsars: General, Stars: Pulsars: Individual Alphanumeric: Psr 1055-52
Scientific paper
Optical/UV emission from isolated neutron stars, if detected, represents a valuable indicator of the pulsar's emission mechanisms, and more so for those objects of "intermediate" age, where thermal and nonthermal processes are known to coexist. PSR 1055-52 is a middle-aged pulsar and a strong gamma -ray emitter. As such, it represents a logical target, but the presence of a nearby star renders optical ground-based searches totally hopeless. The Hubble Space Telescope Faint Object Camera (FOC), however, was successful in detecting the pulsar's emission through its U (F342) filter. It is interesting to compare such emission with an extrapolation of the soft, thermal part of the ROSAT X-ray spectrum. Within the uncertainties, it appears that the FOC flux is compatible with the Rayleigh-Jeans side of such a spectrum, as was the case for Geminga, in many ways a similar object. PSR 1055-52 becomes one of three pulsars (besides the Crab and Vela) visible at all wavelengths.
Bignami Giovanni F.
Caraveo Patricia A.
Mignani Roberto
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