General Information
This web tool allows you to calculate a population synthesis for cooling young isolated neutron stars in the solar vicinity.
A new test for cooling curves of compact objects was proposed by Popov et al. 2006, A&A 448, 327 based on the population synthesis of
closeby isolated cooling neutron stars.
Further details can be found in
 Popov & Prokhorov 2007, Physics Uspekhi 50, 1123
 Popov et al. 2003, A&A 406, 111
 Popov et al. 2005, Ap&SS 299, 117
 Popov et al. 2006, Phys. Rev. C 74, 025803
 Posselt et al. 2008, A&A 482, 617 (A&A 512, id. C2)
 Popov et al. 2010, MNRAS 401, 2675

The webtool is based on the latest version of the population synthesis code (Popov et al. 2010, MNRAS 401, 2675).
We calculate the evolution of young (typically ~1Myr) closeby (<3kpc) neutron stars. For details we refer the user
to Boldin et al. 2010, AN. 

Parameters 
Number of stars: 
Number of simulations. We suggest to use ~5000, typically enough to avoid statistical fluctuations. In any case, please use at least a value of 100. 
Masses and cooling curves: 
Properties of the equation of state 

Mass: 
This is a set of neutron star masses (in solar masses) for the respective cooling curves. Masses are gravitational. 

Mass fraction: 
The mass spectrum is normalized to unity.
The mass fraction for each bin can be defined manually
or the default mass fraction can be used. In the latter case, the mass fraction for each mass specified
will be calculated by the program. The final mass spectrum is available together with the final results.


Radius: 
This is a set of neutron star radii (in cm) corresponding to the masses defined. Radii are circumferential. 

Cooling curves: 
This section defines cooling curves by calculating the temperature for
each timestep as a linear interpolation between two values of the uploaded tables.
They need to be uploaded as ASCII tables including two columns with
Time in years
Temperature in Kelvin





Information on output data 
Figures 
agedist_0_1: 
Age distribution for neutron stars with ROSAT count rates S > 1 cts/s. 
agedist_1_0: 
Age distribution for neutron stars with ROSAT count rates 0.1 cts/s < S < 1 cts/s. 
agedist_2_1: 
Age distribution for neutron stars with ROSAT count rates 0.01 cts/s < S < 0.1 cts/s. 
logNlogS: 
Log N  Log S distribution and ROSAT data points with poissonian errors. 
masspdf: 
Mass spectrum used in the calculations.
If the mass spectrum is defined by the user, it is rebinned for the given number of masses (up to eight). Otherwise,
the default spectrum is used. 
rdist_0_1: 
Distance distribution for neutron stars with ROSAT count rates S > 1 cts/s. 
rdist_1_0: 
Distance distribution for neutron stars with ROSAT count rates 0.1 cts/s < S < 1 cts/s. 
rdist_2_1: 
Distance distribution for neutron stars with ROSAT count rates 0.01 cts/s < S < 0.1 cts/s. 

Data files 
agedist_0_1: 
Age distribution for neutron stars with ROSAT count rates S > 1 cts/s (see also corresponding figure).
First column  age in Myr,
second column  number of sources with the count rate S > 1 cts/s per age bin. 
agedist_1_0: 
Age distribution for neutron stars with ROSAT count rates 0.1 cts/s < S < 1 cts/s (see also corresponding figure).
First column  age in Myr,
second column  number of sources with the count rate 0.1 cts/s < S < 1 cts/s per age bin. 
agedist_2_1: 
Age distribution for neutron stars with ROSAT count rates 0.01 cts/s < S < 0.1 (see also corresponding figure).
First column  age in Myr,
second column  number of sources with the count rate 0.01 cts/s < S < 0.1 per age bin. 
cts_N: 
Log N  Log S data normalised to the birthrate 270 neutron stars in a Myr inside 3 kpc.
First column  count rate,
second column  number of sources with the count rate larger than the given value. 
cts_Nnot: 

galac_map: 
Expected source distribution in galactic coordinates.
First column  galactic longitude l in degrees,
second column  galactic latitude b in degrees,
third column  ...,
fourth column  ...,
fifth column  ... . 
logcts_N: 
Log N  Log S data normalised to the birthrate 270 neutron stars in a Myr inside 3 kpc.
First column  logarithmic count rate,
second column  number of sources with the count rate larger than the given value. 
population_params: 
Summary of parameters as inserted by the user.
First column  neutron star masses in solar masses corresponding to each cooling curve,
second column  neutron star radii in cm corresponding to each cooling curve,
third column  mass spectrum coefficient corresponding to each cooling curve,
fourth column  ...,
fifth column  name of cooling curve data file as uploaded by the user. 
rdist_0_1: 
Distance distribution for neutron stars with ROSAT count rates S > 1 cts/s (see also corresponding figure).
First column  distance in pc,
second column  number of sources with the count rate S > 1 cts/s per distance bin. 
rdist_1_0: 
Distance distribution for neutron stars with ROSAT count rates 0.1 cts/s < S < 1 cts/s (see also corresponding figure).
First column  distance in pc,
second column  number of sources with the count rate 0.1 cts/s < S < 1 cts/s per distance bin. 
rdist_2_1: 
Distance distribution for neutron stars with ROSAT count rates 0.01 cts/s < S < 0.1 cts/s (see also corresponding figure).
First column  distance in pc,
second column  number of sources with the count rate 0.01 cts/s < S < 0.1 cts/s per distance bin. 


