| Abstract : | Abstract:
Over the last 50 years, X-ray observations have been a significant part of our
time-domain astronomy. After rigorous research, the temporal variability in the
X-ray sources as well as their shapes in the X-ray sky was found to carry crucial
information about nature. Centaurus X-2 was the first X-ray transient to be
discovered in May,1967 during a rocket flight, whereas it was not there during
the last exploration at that part of the X-ray wave region during 1965, and it
astonishingly disappeared when it was again scanned in Sept,1967. Shortly
after this, many sources started to show similar behavior and due to such
behavior of randomly appearing and fade away, then again reappearing in the
X-ray wave band, it is named as ‘X-ray transient’, which along with its literal
meaning as well as behavior manifests the dynamic behavior of our universe. In
this paper we are also going to discuss the types of X-ray transients. We will
also concentrate on the recurrent outbursts, which generally take place in Soft
X-ray transients (SXT) which is one of the types of the X-ray transients. It will
also be seen how SXTs are helpful for the investigation of the physics of the
mass accretion flow taking the mass accretion rate as the function.
Key words: X-ray transient, recurrent outbursts, Soft X-ray transient, mass
accretion rate.
References:
[1] De Luca, A., et al., EXTraS: exploring the X-ray transient and variable sky, Astronomy and
Astrophysics, Volume 650, June 2021.
[2] Shaw, Charles, Finding and Understanding the X-ray transients, Astronomy and Geophysics, Volume
54, Issue 6, Pages 6.22–6.26, December 2013.
[3] Eric M. Schlegel, The Restless Universe: Understanding X-ray Astronomy in the Age of Chandra and
Newton, Oxford University Press,2002.
[4] Juhan Frank, Andrew King, Derek Raine, Accretion Power in Astrophysics, Cambridge University Press,
2002. |
