Recent content by RHK

The time, in MJD (modified julian date, it is like "days").

Hello everyone. I am trying to translate the flux of a source observed by a telescope, in different units. In my case, I have the flux equal to counts/cm^2/sec in a given energy band (15-50 keV) and I want to translate this information in erg/cm^2/sec, in the same energy band Here you can...

Hello to everybody. I am studying the accreting neutron stars (pulsars) in the X-ray band. Reading a number of papers, I noticed that there are two kinds of transients: the "outbursts" and the "flares". Unfortunately, I still don't understand what is the difference between them, if it is...

So, is there no model for the polar emission? I have found some (not well understood) explanations about the emission from the open field lines around the magnetic polar axis... is not this the "standard model"?

From the pdf document: "In polar cap models, the beaming is explained in terms of the relativistic beaming eect for relativistic particles propagating along the magnetic eld lines, which implies that the radiation is conned to a cone with half-angle 1/γ about the direction of the magnetic...

Is there any other idea?

I am sorry, I can not understand. From the link: "The beam originates from the rotational energy of the neutron star, which generates an electrical field from the movement of the very strong magnetic field, resulting in the acceleration of protons and electrons on the star surface and the...

Too much short, perhaps :) Pulsars have a magnetosphere: why does the beaming occur only through the poles?

Hello everybody. I am searching for an explanation about the beamed emission of pulsars, either in radio and in X-rays bands. I can not find a "standard" reason (with demonstration, eventually) for the beaming of this objects' radiation. Please, can you suggest to me something, or even a link...

Thank you very much!

Thank you. Some other questions: So, every follow up survey naturally brings to multi-wavelengths catalogues, right? Is it possible for you to give a "simple" example of data reduction (with programs, procedures, etc.)? FITS files are reduced files?

Hi I am looking for the actual meaning of some technical/procedure words in astronomy, like: 1) Follow-up 2) Pipeline As far I know, the follow up is the observation of an object or a field for a given amount of time, isn't it? Then, if it is, what's the difference with "standard" surveys...

Any ideas please?

Homework Statement The spectroscopic observation of an interstellar gas cloud shows emission lines H (λ=6563 A), Hβ λ=4862 A) e OI (λ=1304 A), each one with a gaussian profile of the kind: g(\nu)=A e^[-\frac{(\nu-\nu_0)^2}{2\sigma^2}] Per Hα si osserva σ_{Hα} = 1.2 \times 10^{10} Hz...

Generally, the background level is estimated from an extraction of the photon counts in a region that doe not contain the source (any source)... As an alternative (maybe) you can consider a certain statistics, and then value the variance, but I am not sure of this.