98.70.-f Unidentified sources of radiation outside the Solar System
- 98.70.Dk Radio sources; Quasars, see 98.54.Aj
- 98.70.Lt IR sources (for IR sources in interstellar medium, see 98.38.Jw and/or 98.58.Jg)
- 98.70.Qy X-ray sources; X-ray bursts (see also 97.30.Qt Novae, dwarf novae, recurrent novae, and other cataclysmic (eruptive) variables; 97.80.Jp X-ray binaries)
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98.70.Rz gamma-ray sources; gamma-ray bursts
(2)
- 98.70.Sa Cosmic rays (including sources, origin, acceleration, and interactions) (see also 26.40.+r Cosmic ray nucleosynthesis-in Nuclear astrophysics)
- 98.70.Vc Background radiations