(soft X-ray and extreme ultraviolet)
(electromagnetic radiation in the range of 0.15-124 nm)
The term XEUV (soft X-ray and extreme ultraviolet)
is used for a spectrum-range covering some astronomical phenomena
and attendant studies.
Papers do not always specify the range they associate with the term,
but clearly it is meant to cover extreme ultraviolet (EUV) and
the less energetic part of the X-ray band (soft X-rays).
The term is useful because any defined boundary between UV and
X-rays would result in sources that emit on both sides the
boundary, in effects of either/both such as photoevaporation,
and in optics techniques appropriate to both. Cited
lower-wavelength boundaries are generally in the 0.1 and 0.2
nm range. However the term may sometimes be intended to cover much
or all of X-rays and/or ultraviolet.
| || |
Referenced by pages:
O-type star (O)