Commit 642919010ffd6380ac2b288a6b14923e3776a8aa

Authored by Jürgen Knödlseder
1 parent 751b558b

Add document describing the COMPTEL interface

doc/dev/inst/com/com-pulsar-phase.eps 0 → 100644
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doc/dev/inst/com/gammalib_com.tex 0 → 100644
  1 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  2 +% GammaLib COMPTEL Interface
  3 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  4 +
  5 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  6 +% Definitions for manual package
  7 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  8 +\newcommand{\task}{\mbox{GammaLib}}
  9 +\newcommand{\this}{\mbox{\tt \task}}
  10 +\newcommand{\shorttype}{\mbox{COMPTEL}}
  11 +\newcommand{\doctype}{\mbox{COMPTEL interface}}
  12 +\newcommand{\version}{\mbox{draft}}
  13 +\newcommand{\calendar}{\mbox{17 January 2021}}
  14 +\newcommand{\auth}{\mbox{J\"urgen Kn\"odlseder}}
  15 +\newcommand{\approv}{\mbox{J\"urgen Kn\"odlseder}}
  16 +\def\sun{\hbox{$\odot$}}
  17 +
  18 +
  19 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  20 +% Document definition
  21 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  22 +\documentclass{article}[12pt,a4]
  23 +\usepackage{epsfig}
  24 +\usepackage{../manual}
  25 +
  26 +
  27 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  28 +% Begin of document body
  29 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  30 +\begin{document}
  31 +\frontpage
  32 +
  33 +
  34 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  35 +% Introduction
  36 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  37 +\section{Introduction}
  38 +
  39 +The present document describes the COMPTEL specific interface that is implemented in \this.
  40 +
  41 +
  42 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  43 +% Definitions
  44 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  45 +\section{Definitions}
  46 +
  47 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  48 +\subsection{Time}
  49 +
  50 +COMPTEL times are defined by two integers: TJD (Truncated Julian Days) and tics (1/8 ms).
  51 +COMPTEL times are given in UTC, and TJD:tics = 8393:0 converts into 1991-05-17T00:00:00 UTC
  52 +(see COM-RP-UNH-DRG-037).
  53 +
  54 +At 8798:28800000 (1992-06-25T01:00:00) the CGRO clock was corrected, before that date the
  55 +CGRO clock was 2.042144 seconds too fast.
  56 +
  57 +Conversion of COMPTEL times to a {\tt GTime} object is implemented by the {\tt gammalib::com\_time()}
  58 +function. The function applies the CGRO clock correction before 8798:28800000 and stores the
  59 +corrected time as UTC time. Specifically
  60 +\begin{equation}
  61 +{\rm MJD} = {\rm TJD} + 40000 + {\rm tics} \times \frac{0.000125}{86400}
  62 +\end{equation}
  63 +and for ${\rm TJD} < 8798$ or ${\rm TJD} = 8798$ and ${\rm tics} < 28800000$:
  64 +\begin{equation}
  65 +{\rm MJD}_{\rm corr} = {\rm MJD} - \frac{2.042144}{86400}
  66 +\end{equation}
  67 +
  68 +
  69 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  70 +% Pulsar analysis
  71 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  72 +\section{Pulsar}
  73 +
  74 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  75 +\subsection{Barycentre correction}
  76 +
  77 +A Barycentre correction is applied to the event times. The formulae were extracted from the COMPASS
  78 +code {\tt pulphi01.pulphi.f}.
  79 +
  80 +{\tt pulphi01.pulphi.f} reads the pulsar ephemeris from a PPT using the {\tt ppptrd.f} function. Specifically
  81 +the following parameters are read
  82 +\begin{itemize}
  83 +\item $t_0$ is the reference epoch of the pulsar ephemeris (specified as TJD and tics);
  84 +\item $\nu_0$ is the frequency at the reference epoch;
  85 +\item $\dot{\nu}_0$ is the first frequency derivative at the reference epoch (specified in units of $10^{-15}$);
  86 +\item $\ddot{\nu}_0$ is the second frequency derivative at the reference epoch (specified in units of $10^{-20}$);
  87 +\item $\alpha$ is the Right Ascension of the pulsar;
  88 +\item $\delta$ is the Declination of the pulsar;
  89 +\item $\nu_{\rm obs}$ is the observed frequency at radio;
  90 +\item $DM$ is the radio Dispersion measure;
  91 +\item $\Phi_0$ is the zero phase defining main peak for EGRET.
  92 +\end{itemize}
  93 +
  94 +The function computes then the centre time of the observation using
  95 +\begin{equation}
  96 +t_{\rm obs} = \frac{1}{2} (t_{\rm start} + t_{\rm end})
  97 +\end{equation}
  98 +where $t_{\rm start}$ and $t_{\rm end}$ are the start and stop time of the EVP dataset of
  99 +interest.
  100 +Using the {\tt pula32.f} function, the pulsar frequency and frequency derivative as well as the zero phase
  101 +are extrapolated to this centre time using
  102 +\begin{equation}
  103 +\nu = \nu_0 + \dot{\nu}_0 (t_{\rm obs} - t_0) + \frac{\ddot{\nu}_0}{2} (t_{\rm obs} - t_0)^2 ,
  104 +\end{equation}
  105 +\begin{equation}
  106 +\dot{\nu} = \dot{\nu}_0 + \ddot{\nu}_0 (t_{\rm obs} - t_0) ,
  107 +\end{equation}
  108 +and
  109 +\begin{equation}
  110 +\Phi = \Phi_0 + \nu_0 (t_{\rm obs} - t_0) + \frac{\dot{\nu}_0}{2} (t_{\rm obs} - t_0)^2 + \frac{\ddot{\nu}_0}{6} (t_{\rm obs} - t_0)^3
  111 +\label{eq:phase-ephemeris}
  112 +\end{equation}
  113 +with $\Phi$ put in the interval $[0,1]$.
  114 +Note that the second frequency derivative is not updated, as it would required a third frequency derivative for
  115 +that.
  116 +
  117 +The subroutine then retrieves the Solar System Barycentre to CGRO spacecraft vector $\vec{s}$ based on the
  118 +information provided in the {\tt BVC} file.
  119 +Based on the event time $t_{\rm utc}$, given in the UTC time system, the routine uses the {\tt pulbcv.f} routine
  120 +to perform a linear interpolation between the two vectors $\vec{s}(i)$ and $\vec{s}(i+1)$ that enclose the event
  121 +time using
  122 +\begin{equation}
  123 +\vec{s} = (\vec{s}(i+1) - \vec{s}(i)) \frac{t_{\rm utc} - t(i) }{t(i+1) - t(i)} + \vec{s}(i)
  124 +\end{equation}
  125 +where $t(i)$ and $t(i+1)$ are the UTC times to which the vectors $i$ and $i+1$ correspond to.
  126 +If $t_{\rm utc}<t(0)$ then the first vector in the file is returned, if $t_{\rm utc}\ge t(N)$ then the last vector
  127 +is returned, where $N$ is the number of BVC vectors in the {\tt BVC} file.
  128 +Note that the {\tt BVC} file specifies $\vec{s}$ in units of micro light seconds.
  129 +
  130 +The celestial vector of the pulsar position is then computed using
  131 +\begin{equation}
  132 +\vec{p} = \left\{ \cos \delta \cos \alpha, \cos \delta \sin \alpha, \sin \delta \right\}
  133 +\end{equation}
  134 +where $\alpha$ and $\delta$ are the Right Ascension and Declination of the pulsar.
  135 +
  136 +The photon arrival time in the Solar System Barycentre $t_{\rm sbb}$, given in Barycentric Dynamic
  137 +Time (TDB), is then computed from the event time $t_{\rm utc}$ in the subroutine {\tt pula04.f} using
  138 +\begin{equation}
  139 +t_{\rm sbb} = t_{\rm utc} + \Delta t_{\rm travel} - \Delta t_{\rm relativistic} + \Delta t_{\rm system}
  140 +\end{equation}
  141 +where
  142 +\begin{equation}
  143 +\Delta t_{\rm travel} = 10^{-6} \times \vec{s} \cdot \vec{p}
  144 +\end{equation}
  145 +is the light travel time from the CGRO to the Solar System Barycentre along the pulsar direction,
  146 +\begin{equation}
  147 +\Delta t_{\rm relativistic} = -2 t_{\sun} \log \left( 1 + \frac{ \Delta t_{\rm travel} }{10^{-6} | \vec{s} |} \right)
  148 +\end{equation}
  149 +is the relativistic delay due to the Sun, also known as Shapiro delay, with
  150 +$t_{\sun} \equiv G M_{\sun} c^{-3} = 4.9254909 \times 10^{-6}$ s
  151 +being half the Schwarzschild radius of the Sun divided by the speed of light, and
  152 +\begin{equation}
  153 +\Delta t_{\rm system} = N_{\rm leaps} + 32.184 + \Delta t_{TT \to TBD}
  154 +\end{equation}
  155 +converts from UTC to the TDB time system, with $N_{\rm leaps}$ being the number of leap seconds.
  156 +In all equations, time is expressed in units of seconds.
  157 +
  158 +The pulse phase $\Phi_{\rm COMPTEL}$ for COMPTEL is then evaluated using
  159 +\begin{equation}
  160 +\Phi_{\rm COMPTEL} = \theta_0 + \Phi + \nu (t_{\rm sbb} - t_{\rm obs}) + \frac{\dot{\nu}}{2} (t_{\rm sbb} - t_{\rm obs})^2 + \frac{\ddot{\nu}_0}{6} (t_{\rm sbb} - t_{\rm obs})^3
  161 +\label{eq:phase-comptel}
  162 +\end{equation}
  163 +with $\Phi_{\rm COMPTEL}$ put in the interval $[0,1]$, where
  164 +\begin{equation}
  165 +\theta_0 = \frac{-DM \times 10^{4}}{2.41 \times \nu_{\rm obs}^2}
  166 +\end{equation}
  167 +is the phase shift of radio pulsars due to the dispersion in the Interstellar Medium, with $DM$ in units of g/cm$^3$,
  168 +and $\theta_0=0$ for infinite frequency pulsar ephemerides.
  169 +
  170 +Figure \ref{fig:pulsar-phase} compares the phase computation using Eq.~(\ref{eq:phase-comptel}) to the one using
  171 +Eq.~(\ref{eq:phase-ephemeris}), i.e.~without passing through an intermediate reference time $t_{\rm obs}$.
  172 +Obviously the phase difference is negligible, and the computation, implemented in {\tt pula32.f}, of an intermediate
  173 +reference time can be avoided.
  174 +
  175 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  176 +\begin{figure}[!t]
  177 +\center
  178 +\epsfig{figure=com-pulsar-phase.eps, width=12cm}
  179 +\caption{Maximum phase difference between computing the phase via an intermediate
  180 +reference time $t_{\rm obs}$ using Eq.~(\ref{eq:phase-comptel}) or via using the ephemeris
  181 +reference time $t_0$ using Eq.~(\ref{eq:phase-ephemeris}). The phase difference is negligible.}
  182 +\label{fig:pulsar-phase}
  183 +\end{figure}
  184 +%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  185 +
  186 +
  187 +
  188 +\end{document}
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