1.1.1.0 image.convertflux

NRAO Home > CASA > CASA Toolkit Reference Manual

image.convertflux - Function

1.1.1 Convert peak intensity to/from flux density for a 2D Gaussian.

Description

This function interconverts between peak intensity and flux density for a Gaussian component. The image must hold a restoring beam.

Arguments


Inputs
value	Flux density to convert. Must be specified.
	allowed:	any
	Default:	variant 0Jy/beam
major	Major axis of component. Must be specified.
	allowed:	any
	Default:	variant 1arcsec
minor	Minor axis of component. Must be specified.
	allowed:	any
	Default:	variant 1arcsec
type	Type of component. String from Gaussian, Disk.
	allowed:	string
	Default:	Gaussian
topeak	Convert to peak or integral flux desnity
	allowed:	bool
	Default:	true
channel	Channel to use if and only if image has per plane beams.
	allowed:	int
	Default:	-1
polarization	Zero-based polarization number to use for beam if and only if image has per plane beams.
	allowed:	int
	Default:	-1

Returns
record

Example

"""
#
print "\t----\t convertflux Ex 1 \t----"
ia.maketestimage(’in.im’, overwrite=true);
p1 = qa.quantity(’1mJy/beam’)
i1 = ia.convertflux(p1, major=’30arcsec’, minor=’10arcsec’, topeak=False);
p2 = ia.convertflux(i1, major=’30arcsec’, minor=’10arcsec’, topeak=True)
print ’peak, integral, peak = ’, p1, i1, p2
#peak, integral, peak =  {’value’: 1.0, ’unit’: ’mJy/beam’}
#                        {’value’: 0.00016396129551656742, ’unit’: ’Jy’}
#                        {’value’: 0.0010000000000000002, ’unit’: ’Jy/beam’}

ia.close()
#
"""

__________________________________________________________________

[next] [prev] [prev-tail] [front] [up]

More information about CASA may be found at the CASA web page

This code is available under the terms of the GNU General Public Lincense