8,641 research outputs found
A Complete Monotonicity of the Gamma Function
The function 1/x ln Ī(x+1)āln x+1 is strictly completely monotonic
on (0,ā)
Logarithmically Completely Monotonic Ratios of Mean Values and an Application
In the article, some strictly Logarithmically completely monotonic
ratios of mean values are presented
Monotonicity and Inequalities for Ratio of the Generalized Logarithmic Means
Let c > b > a > 0 be real numbers. Then the function f(r) =
Lr(a,b)/Lr(a,c) is strictly decreasing on (āā,ā), where Lr(a, b) denotes the generalized (extended) logarithmic mean of two positive numbers a and b
The disappearance of a narrow Mg II absorption system in quasar SDSS J165501.31+260517.4
In this letter, we present for the first time, the discovery of the
disappearance of a narrow Mg II absorption system
from the spectra of quasar SDSS J165501.31+260517.4 (). This
absorber is located at , and has a velocity offset of
with respect to the quasar. According to the velocity
offset and the line variability, this narrow Mg II
absorption system is likely intrinsic to the quasar. Since the corresponding UV
continuum emission and the absorption lines of another narrow Mg II
absorption system at are very
stable, we think that the disappearance of the absorption system is unlikely to
be caused by the change in ionization of absorption gas. Instead, it likely
arises from the motion of the absorption gas across the line of sight
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