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<h4><a name="uk.ac.starlink.ttools.func.Fluxes">10.5.3 Fluxes</a></h4>
<p>Functions for conversion between flux and magnitude values.
Functions are provided for conversion between flux in Janskys and
AB magnitudes.
</p>
<p>Some constants for approximate conversions between different magnitude
scales are also provided:
<ul>
<li>Constants <code>JOHNSON_AB_*</code>, for Johnson <-> AB magnitude
conversions, from
Frei and Gunn, Astronomical Journal <em>108</em>, 1476 (1994),
Table 2
(<a href="http://adsabs.harvard.edu/abs/1994AJ....108.1476F">1994AJ....108.1476F</a>).
</li>
<li>Constants <code>VEGA_AB_*</code>, for Vega <-> AB magnitude
conversions, from
Blanton et al., Astronomical Journal <em>129</em>, 2562 (2005),
Eqs. (5)
(<a href="http://adsabs.harvard.edu/abs/2005AJ....129.2562B">2005AJ....129.2562B</a>).
</li>
</ul>
</p>
<p>
<dl>
<dt><strong><code>abToJansky( magAB )</code></strong></dt>
<dd>Converts AB magnitude to flux in Jansky.
<p>F/Jy=10<sup>(23-(AB+48.6)/2.5)</sup><ul>
<li><code>magAB</code> <em>(floating point)</em>: AB magnitude value
</li>
<li>return value <em>(floating point)</em>: equivalent flux in Jansky
</li>
</ul>
</p>
</dd>
<dt><strong><code>janskyToAb( fluxJansky )</code></strong></dt>
<dd>Converts flux in Jansky to AB magnitude.
<p>AB=2.5*(23-log<sub>10</sub>(F/Jy))-48.6
<ul>
<li><code>fluxJansky</code> <em>(floating point)</em>: flux in Jansky
</li>
<li>return value <em>(floating point)</em>: equivalent AB magnitude
</li>
</ul>
</p>
</dd>
<dt><strong><code>luminosityToFlux( lumin, dist )</code></strong></dt>
<dd>Converts luminosity to flux given a luminosity distance.
<p>F=lumin/(4 x Pi x dist<sup>2</sup>)
<ul>
<li><code>lumin</code> <em>(floating point)</em>: luminosity
</li>
<li><code>dist</code> <em>(floating point)</em>: luminosity distance
</li>
<li>return value <em>(floating point)</em>: equivalent flux
</li>
</ul>
</p>
</dd>
<dt><strong><code>fluxToLuminosity( flux, dist )</code></strong></dt>
<dd>Converts flux to luminosity given a luminosity distance.
<p>lumin=(4 x Pi x dist<sup>2</sup>) F
<ul>
<li><code>flux</code> <em>(floating point)</em>: flux
</li>
<li><code>dist</code> <em>(floating point)</em>: luminosity distance
</li>
<li>return value <em>(floating point)</em>: equivalent luminosity
</li>
</ul>
</p>
</dd>
<dt><strong><code>JOHNSON_AB_V</code></strong></dt>
<dd>Approximate offset between Johnson and AB magnitudes in V band.
V<sub>J</sub>~=V<sub>AB</sub>+<code>JOHNSON_AB_V</code>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_B</code></strong></dt>
<dd>Approximate offset between Johnson and AB magnitudes in B band.
B<sub>J</sub>~=B<sub>AB</sub>+<code>JOHNSON_AB_B</code>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_Bj</code></strong></dt>
<dd>Approximate offset between Johnson and AB magnitudes in Bj band.
Bj<sub>J</sub>~=Bj<sub>AB</sub>+<code>JOHNSON_AB_Bj</code>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_R</code></strong></dt>
<dd>Approximate offset between Johnson and AB magnitudes in R band.
R<sub>J</sub>~=R<sub>AB</sub>+<code>JOHNSON_AB_R</code>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_I</code></strong></dt>
<dd>Approximate offset between Johnson and AB magnitudes in I band.
I<sub>J</sub>~=I<sub>AB</sub>+<code>JOHNSON_AB_I</code>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_g</code></strong></dt>
<dd>Approximate offset between Johnson and AB magnitudes in g band.
g<sub>J</sub>~=g<sub>AB</sub>+<code>JOHNSON_AB_g</code>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_r</code></strong></dt>
<dd>Approximate offset between Johnson and AB magnitudes in r band.
r<sub>J</sub>~=r<sub>AB</sub>+<code>JOHNSON_AB_r</code>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_i</code></strong></dt>
<dd>Approximate offset between Johnson and AB magnitudes in i band.
i<sub>J</sub>~=i<sub>AB</sub>+<code>JOHNSON_AB_i</code>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_Rc</code></strong></dt>
<dd>Approximate offset between Johnson and AB magnitudes in Rc band.
Rc<sub>J</sub>~=Rc<sub>AB</sub>+<code>JOHNSON_AB_Rc</code>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_Ic</code></strong></dt>
<dd>Approximate offset between Johnson and AB magnitudes in Ic band.
Ic<sub>J</sub>~=Ic<sub>AB</sub>+<code>JOHNSON_AB_Ic</code>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_uPrime</code></strong></dt>
<dd>Offset between Johnson and AB magnitudes in u' band (zero).
u'<sub>J</sub>=u'<sub>AB</sub>+<code>JOHNSON_AB_uPrime</code>=u'<sub>AB</sub>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_gPrime</code></strong></dt>
<dd>Offset between Johnson and AB magnitudes in g' band (zero).
g'<sub>J</sub>=g'<sub>AB</sub>+<code>JOHNSON_AB_gPrime</code>=g'<sub>AB</sub>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_rPrime</code></strong></dt>
<dd>Offset between Johnson and AB magnitudes in r' band (zero).
r'<sub>J</sub>=r'<sub>AB</sub>+<code>JOHNSON_AB_rPrime</code>=r'<sub>AB</sub>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_iPrime</code></strong></dt>
<dd>Offset between Johnson and AB magnitudes in i' band (zero).
i'<sub>J</sub>=i'<sub>AB</sub>+<code>JOHNSON_AB_iPrime</code>=i'<sub>AB</sub>.
<ul></ul>
</dd>
<dt><strong><code>JOHNSON_AB_zPrime</code></strong></dt>
<dd>Offset between Johnson and AB magnitudes in z' band (zero).
z'<sub>J</sub>=z'<sub>AB</sub>+<code>JOHNSON_AB_zPrime</code>=z'<sub>AB</sub>.
<ul></ul>
</dd>
<dt><strong><code>VEGA_AB_J</code></strong></dt>
<dd>Approximate offset between Vega (as in 2MASS) and AB magnitudes
in J band.
J<sub>Vega</sub>~=J<sub>AB</sub>+<code>VEGA_AB_J</code>.
<ul></ul>
</dd>
<dt><strong><code>VEGA_AB_H</code></strong></dt>
<dd>Approximate offset between Vega (as in 2MASS) and AB magnitudes
in H band.
H<sub>Vega</sub>~=H<sub>AB</sub>+<code>VEGA_AB_H</code>.
<ul></ul>
</dd>
<dt><strong><code>VEGA_AB_K</code></strong></dt>
<dd>Approximate offset between Vega (as in 2MASS) and AB magnitudes
in K band.
K<sub>Vega</sub>~=K<sub>AB</sub>+<code>VEGA_AB_K</code>.
<ul></ul>
</dd>
</dl>
</p>
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<hr><i>STILTS - Starlink Tables Infrastructure Library Tool Set<br>Starlink User Note256<br>STILTS web page:
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