Fluxes (Starlink-UK API)

java.lang.Object
- uk.ac.starlink.ttools.func.Fluxes

```
public class Fluxes
extends Object
```
Functions for conversion between flux and magnitude values. Functions are provided for conversion between flux in Janskys and AB magnitudes.
Some constants for approximate conversions between different magnitude scales are also provided:
- Constants JOHNSON_AB_*, for Johnson <-> AB magnitude conversions, from Frei and Gunn, Astronomical Journal 108, 1476 (1994), Table 2 (1994AJ....108.1476F).
- Constants VEGA_AB_*, for Vega <-> AB magnitude conversions, from Blanton et al., Astronomical Journal 129, 2562 (2005), Eqs. (5) (2005AJ....129.2562B).
Since:

30 Jun 2006

Author:

Mark Taylor

Field Summary

Fields
Modifier and Type	Field and Description
`static double`	`JOHNSON_AB_B` Approximate offset between Johnson and AB magnitudes in B band.
`static double`	`JOHNSON_AB_Bj` Approximate offset between Johnson and AB magnitudes in Bj band.
`static double`	`JOHNSON_AB_g` Approximate offset between Johnson and AB magnitudes in g band.
`static double`	`JOHNSON_AB_gPrime` Offset between Johnson and AB magnitudes in g' band (zero).
`static double`	`JOHNSON_AB_i` Approximate offset between Johnson and AB magnitudes in i band.
`static double`	`JOHNSON_AB_I` Approximate offset between Johnson and AB magnitudes in I band.
`static double`	`JOHNSON_AB_Ic` Approximate offset between Johnson and AB magnitudes in Ic band.
`static double`	`JOHNSON_AB_iPrime` Offset between Johnson and AB magnitudes in i' band (zero).
`static double`	`JOHNSON_AB_r` Approximate offset between Johnson and AB magnitudes in r band.
`static double`	`JOHNSON_AB_R` Approximate offset between Johnson and AB magnitudes in R band.
`static double`	`JOHNSON_AB_Rc` Approximate offset between Johnson and AB magnitudes in Rc band.
`static double`	`JOHNSON_AB_rPrime` Offset between Johnson and AB magnitudes in r' band (zero).
`static double`	`JOHNSON_AB_uPrime` Offset between Johnson and AB magnitudes in u' band (zero).
`static double`	`JOHNSON_AB_V` Approximate offset between Johnson and AB magnitudes in V band.
`static double`	`JOHNSON_AB_zPrime` Offset between Johnson and AB magnitudes in z' band (zero).
`static double`	`VEGA_AB_H` Approximate offset between Vega (as in 2MASS) and AB magnitudes in H band.
`static double`	`VEGA_AB_J` Approximate offset between Vega (as in 2MASS) and AB magnitudes in J band.
`static double`	`VEGA_AB_K` Approximate offset between Vega (as in 2MASS) and AB magnitudes in K band.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method and Description
`static double`	`abToJansky(double magAB)` Converts AB magnitude to flux in Jansky.
`static double`	`fluxToLuminosity(double flux, double dist)` Converts flux to luminosity given a luminosity distance.
`static double`	`janskyToAb(double fluxJansky)` Converts flux in Jansky to AB magnitude.
`static double`	`luminosityToFlux(double lumin, double dist)` Converts luminosity to flux given a luminosity distance.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - JOHNSON_AB_V
```
public static final double JOHNSON_AB_V
```
    Approximate offset between Johnson and AB magnitudes in V band. V_J~=V_AB+JOHNSON_AB_V.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_B
```
public static final double JOHNSON_AB_B
```
    Approximate offset between Johnson and AB magnitudes in B band. B_J~=B_AB+JOHNSON_AB_B.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_Bj
```
public static final double JOHNSON_AB_Bj
```
    Approximate offset between Johnson and AB magnitudes in Bj band. Bj_J~=Bj_AB+JOHNSON_AB_Bj.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_R
```
public static final double JOHNSON_AB_R
```
    Approximate offset between Johnson and AB magnitudes in R band. R_J~=R_AB+JOHNSON_AB_R.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_I
```
public static final double JOHNSON_AB_I
```
    Approximate offset between Johnson and AB magnitudes in I band. I_J~=I_AB+JOHNSON_AB_I.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_g
```
public static final double JOHNSON_AB_g
```
    Approximate offset between Johnson and AB magnitudes in g band. g_J~=g_AB+JOHNSON_AB_g.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_r
```
public static final double JOHNSON_AB_r
```
    Approximate offset between Johnson and AB magnitudes in r band. r_J~=r_AB+JOHNSON_AB_r.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_i
```
public static final double JOHNSON_AB_i
```
    Approximate offset between Johnson and AB magnitudes in i band. i_J~=i_AB+JOHNSON_AB_i.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_Rc
```
public static final double JOHNSON_AB_Rc
```
    Approximate offset between Johnson and AB magnitudes in Rc band. Rc_J~=Rc_AB+JOHNSON_AB_Rc.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_Ic
```
public static final double JOHNSON_AB_Ic
```
    Approximate offset between Johnson and AB magnitudes in Ic band. Ic_J~=Ic_AB+JOHNSON_AB_Ic.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_uPrime
```
public static final double JOHNSON_AB_uPrime
```
    Offset between Johnson and AB magnitudes in u' band (zero). u'_J=u'_AB+JOHNSON_AB_uPrime=u'_AB.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_gPrime
```
public static final double JOHNSON_AB_gPrime
```
    Offset between Johnson and AB magnitudes in g' band (zero). g'_J=g'_AB+JOHNSON_AB_gPrime=g'_AB.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_rPrime
```
public static final double JOHNSON_AB_rPrime
```
    Offset between Johnson and AB magnitudes in r' band (zero). r'_J=r'_AB+JOHNSON_AB_rPrime=r'_AB.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_iPrime
```
public static final double JOHNSON_AB_iPrime
```
    Offset between Johnson and AB magnitudes in i' band (zero). i'_J=i'_AB+JOHNSON_AB_iPrime=i'_AB.
    
    See Also:
    
    Constant Field Values
  - JOHNSON_AB_zPrime
```
public static final double JOHNSON_AB_zPrime
```
    Offset between Johnson and AB magnitudes in z' band (zero). z'_J=z'_AB+JOHNSON_AB_zPrime=z'_AB.
    
    See Also:
    
    Constant Field Values
  - VEGA_AB_J
```
public static final double VEGA_AB_J
```
    Approximate offset between Vega (as in 2MASS) and AB magnitudes in J band. J_Vega~=J_AB+VEGA_AB_J.
    
    See Also:
    
    Constant Field Values
  - VEGA_AB_H
```
public static final double VEGA_AB_H
```
    Approximate offset between Vega (as in 2MASS) and AB magnitudes in H band. H_Vega~=H_AB+VEGA_AB_H.
    
    See Also:
    
    Constant Field Values
  - VEGA_AB_K
```
public static final double VEGA_AB_K
```
    Approximate offset between Vega (as in 2MASS) and AB magnitudes in K band. K_Vega~=K_AB+VEGA_AB_K.
    
    See Also:
    
    Constant Field Values
- Method Detail
  - abToJansky
```
public static double abToJansky(double magAB)
```
    Converts AB magnitude to flux in Jansky.
    F/Jy=10^{(23-(AB+48.6)/2.5)}
    
    Parameters:
    
    magAB - AB magnitude value
    
    Returns:
    
    equivalent flux in Jansky
  - janskyToAb
```
public static double janskyToAb(double fluxJansky)
```
    Converts flux in Jansky to AB magnitude.
    AB=2.5*(23-log₁₀(F/Jy))-48.6
    
    Parameters:
    
    fluxJansky - flux in Jansky
    
    Returns:
    
    equivalent AB magnitude
  - luminosityToFlux
```
public static double luminosityToFlux(double lumin,
                                      double dist)
```
    Converts luminosity to flux given a luminosity distance.
    F=lumin/(4 x Pi x dist²)
    
    Parameters:
    
    lumin - luminosity
    
    dist - luminosity distance
    
    Returns:
    
    equivalent flux
  - fluxToLuminosity
```
public static double fluxToLuminosity(double flux,
                                      double dist)
```
    Converts flux to luminosity given a luminosity distance.
    lumin=(4 x Pi x dist²) F
    
    Parameters:
    
    flux - flux
    
    dist - luminosity distance
    
    Returns:
    
    equivalent luminosity

Class Fluxes

Field Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

JOHNSON_AB_V

JOHNSON_AB_B

JOHNSON_AB_Bj

JOHNSON_AB_R

JOHNSON_AB_I

JOHNSON_AB_g

JOHNSON_AB_r

JOHNSON_AB_i

JOHNSON_AB_Rc

JOHNSON_AB_Ic

JOHNSON_AB_uPrime

JOHNSON_AB_gPrime

JOHNSON_AB_rPrime

JOHNSON_AB_iPrime

JOHNSON_AB_zPrime

VEGA_AB_J

VEGA_AB_H

VEGA_AB_K

Method Detail

abToJansky

janskyToAb

luminosityToFlux

fluxToLuminosity