Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the peak radio and X-ray emission from neutron star and black hole
  candidate X-ray transients   We have compiled and analysed reports from the literature of
(quasi-)simultaneous observations of X-ray transients at radio and X-ray
wavelengths and compared them with each other and with more unusual
radio-bright sources such as Cygnus X-3, GRS 1915+105 and Circinus X-1. There
exists a significant (>97% likelihood) positive (rank) correlation between the
peak X-ray flux P_X and radio flux density P_R for the black hole candidate
(BHC) systems, and a marginally significant positive (rank) correlation for the
neutron star (NS) systems. This is further evidence for a coupling between
accretion and outflows in X-ray binary systems, in this case implying a
relation between peak disc-accretion-rate and the number of synchroton-emitting
electrons ejected. However, we also show that the distribution of `radio
loudness', P_R/P_X, is significantly different for the two samples, in the
sense that the BHCs generally have a higher ratio of P_R/P_X. The origin of
this discrepancy is uncertain, but probably reflects differences in the
energetics and/or radiative efficiency of flows around the neutron stars and
black holes; we briefly discuss some of these possibilities. We conclude that
these data point to the formation of a mildly relativistic jet whose luminosity
is a function of the accretion rate, in the majority, if not all, of X-ray
transient outbursts, but whose relation to the observed X-ray emission is
dependent on the nature of the accreting compact object. (Abridged).

7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph