J/A+A/553/A80 Dust effects on photometric parameters in spirals (Pastrav+, 2013)
The effects of dust on the derived photometric parameters of disks and bulges
in spiral galaxies.
Pastrav B.A., Popescu C.C., Tuffs R.J., Sansom A.E.
<Astron. Astrophys. 553, A80 (2013)>
=2013A&A...553A..80P 2013A&A...553A..80P
ADC_Keywords: Galaxies, photometry ; Morphology
Keywords: galaxies: spiral - galaxies: bulges - galaxies: photometry -
galaxies: structure - dust, extinction - radiative transfer
Abstract:
We present results of a study made to quantify the effects of dust on
the derived photometric parameters of disks (old and young stellar
disks) and bulges: disk scale-lengths, axis-ratios, central
surface-brightness, bulge effective radii, and Sersic indices. The
changes in the derived photometric parameters from their intrinsic
values (as would be seen in the absence of dust) were obtained by
fitting simulated images of disks and bulges produced using radiative
transfer calculations. The simulations were fitted with the GALFIT
3.0.2 data analysis algorithm and the fitted models were the commonly
used infinitely thin disks described by exponential, general Sersic
and de Vaucouleurs distributions.
Description:
The tables from appendix A (tableA) list the corrections for
projection effects while the tables from appendix B (tableB) list
the corrections for dust. The corrections are given for the derived
photometric parameters of the main morphological components of spiral
galaxies: disks, thin disks and bulges. The corrections are given as a
function of inclination, central face-on optical depth in the B band
taufB, and wavelength. The parameter space covered by this is as
follows:
taufB={0.1,0.3,0.5,1.0,2.0,4.0,8.0}
wavelength (in Angstrom):
912,1350,1500,1650,2000,2200,2500,2800,3650,4430,5640,8090,12590,22000
We note here that in the model of Popescu et al. (2011, Cat.
J/A+A/527/A109) the disk consists of an old stellar population that
mainly emits in the optical/near-infrared range. Because of this the
disk is not taken to emit in the ultraviolet, and therefore the
corrections for disks are only listed in the optical/near-infrared
range. Similarly, the corrections for bulge are also presented only
for the optical/near-infrared range.
The corrections are provided for photometric fits done with the following
functions:
i) exponential functions for disks and thin disks
ii) variable index Sersic functions for disks, thin disks and bulges
iii) de Vaucouleurs functions for bulges.
For the case of bulges corrections are provided for both exponential bulges
(i.e. Sersic index fixed to unity) and de Vaucouleurs bulges.
The photometric parameters for which corrections are listed are as follows:
R - the exponential scalelength
Reff - the effective radius
delta SB - the central surface brightness of the disk
Q - the axis ratio of the disk
nsers - the Sersic index
To facilitate access to the information and to allow the corrections to be
calculated for any inclination, the corrections are presented in the form of
polynomial function fits. For most of the cases the fitted function is
given by Eq. 14 of the paper. In the case of the axis-ratio of disks,
Q, the fits are done with a combination of a polynomial and a
constant, as given by Eqs. 19 and 21 of the paper.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 18 30 Projection effects(disk)-exponential fits (B-K bands)
tablea2.dat 12 35 Projection effects(disk)-exponential fits (B-K bands)
tablea3.dat 26 30 Projection effects(disk)-Sersic fits (B-K bands)
tablea4.dat 24 8 Projection effects(bulges)-Sersic fits
tablea5.dat 8 1 Projection effects(bulges)-de Vaucouleurs fits
tableb1.dat 27 42 Dust effects(disk)-exponential fits (B band)
tableb2.dat 27 42 Dust effects(disk)-exponential fits (V band)
tableb3.dat 27 42 Dust effects(disk)-exponential fits (I band)
tableb4.dat 27 41 Dust effects(disk)-exponential fits (J band)
tableb5.dat 27 42 Dust effects(disk)-exponential fits (K band)
tableb6.dat 18 21 Dust effects(disk)-exp. fits(axis-ratios,B band)
tableb7.dat 18 21 Dust effects(disk)-exp. fits(axis-ratios,V band)
tableb8.dat 18 21 Dust effects(disk)-exp. fits(axis-ratios,I band)
tableb9.dat 18 21 Dust effects(disk)-exp. fits(axis-ratios,J band)
tableb10.dat 18 21 Dust effects(disk)-exp. fits(axis-ratios,K band)
tableb11.dat 36 43 Dust effects(disk)-Sersic fits (B band)
tableb12.dat 36 43 Dust effects(disk)-Sersic fits (V band)
tableb13.dat 36 43 Dust effects(disk)-Sersic fits (I band)
tableb14.dat 36 43 Dust effects(disk)-Sersic fits (J band)
tableb15.dat 36 43 Dust effects(disk)-Sersic fits (K band)
tableb16.dat 29 42 Dust effects(thin disk)-exponential fits(UV09, 91.2nm)
tableb17.dat 29 42 Dust effects(thin disk)-exponential fits(UV13, 135nm)
tableb18.dat 29 42 Dust effects(thin disk)-exponential fits(UV15, 150nm)
tableb19.dat 29 42 Dust effects(thin disk)-exponential fits(UV16, 165nm)
tableb20.dat 29 42 Dust effects(thin disk)-exponential fits(UV10, 200nm)
tableb21.dat 29 42 Dust effects(thin disk)-exponential fits(UV22, 220nm)
tableb22.dat 29 42 Dust effects(thin disk)-exponential fits(UV25, 250nm)
tableb23.dat 29 42 Dust effects(thin disk)-exponential fits(UV28, 280nm)
tableb24.dat 29 42 Dust effects(thin disk)-exponential fits(UV36, 360nm)
tableb25.dat 29 42 Dust effects(thin disk)-exponential fits(B band)
tableb26.dat 29 42 Dust effects(thin disk)-exponential fits(V band)
tableb27.dat 29 42 Dust effects(thin disk)-exponential fits(I band)
tableb28.dat 29 42 Dust effects(thin disk)-exponential fits(J band)
tableb29.dat 29 42 Dust effects(thin disk)-exponential fits(K band)
tableb30.dat 29 42 Dust effects(thin disk)-exponential fits(Halpha)
tableb31.dat 36 42 Dust effects(thin disk)-Sersic fits(91.2nm)
tableb32.dat 36 42 Dust effects(thin disk)-Sersic fits(135nm)
tableb33.dat 36 42 Dust effects(thin disk)-Sersic fits(150nm)
tableb34.dat 36 42 Dust effects(thin disk)-Sersic fits(165nm)
tableb35.dat 36 42 Dust effects(thin disk)-Sersic fits(200nm)
tableb36.dat 36 42 Dust effects(thin disk)-Sersic fits(220nm)
tableb37.dat 36 42 Dust effects(thin disk)-Sersic fits(250nm)
tableb38.dat 36 42 Dust effects(thin disk)-Sersic fits(280nm)
tableb39.dat 36 42 Dust effects(thin disk)-Sersic fits(360nm)
tableb40.dat 36 42 Dust effects(thin disk)-exponential fits(B band)
tableb41.dat 36 42 Dust effects(thin disk)-exponential fits(V band)
tableb42.dat 36 42 Dust effects(thin disk)-exponential fits(I band)
tableb43.dat 36 42 Dust effects(thin disk)-exponential fits(J band)
tableb44.dat 36 42 Dust effects(thin disk)-exponential fits(K band)
tableb45.dat 36 42 Dust effects(thin disk)-exponential fits(Halpha)
tableb46.dat 28 42 Dust effects(exponential bulge)-Sersic fits(B band)
tableb47.dat 28 42 Dust effects(exponential bulge)-Sersic fits(V band)
tableb48.dat 28 42 Dust effects(exponential bulge)-Sersic fits(I band)
tableb49.dat 28 42 Dust effects(exponential bulge)-Sersic fits(J band)
tableb50.dat 28 42 Dust effects(exponential bulge)-Sersic fits(K band)
tableb51.dat 28 42 Dust effects(de Vauc. bulge)-Sersic fits(B band)
tableb52.dat 28 42 Dust effects(de Vauc. bulge)-Sersic fits(V band)
tableb53.dat 28 42 Dust effects(de Vauc. bulge)-Sersic fits(I band)
tableb54.dat 28 42 Dust effects(de Vauc. bulge)-Sersic fits(J band)
tableb55.dat 28 42 Dust effects(de Vauc. bulge)-Sersic fits(K band)
tableb56.dat 19 42 Dust effects(de Vauc. bulge)-de Vauc. fits(B)
tableb57.dat 19 42 Dust effects(de Vauc. bulge)-de Vauc. fits(V)
tableb58.dat 19 42 Dust effects(de Vauc. bulge)-de Vauc. fits(I)
tableb59.dat 19 42 Dust effects(de Vauc. bulge)-de Vauc. fits(J)
tableb60.dat 19 42 Dust effects(de Vauc. bulge)-de Vauc. fits(K)
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See also:
J/A+A/527/A109 : Dust and PAH emission SEDs of disk galaxies (Popescu+, 2011)
Byte-by-byte Description of file: tablea1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Band [BVIJK ] Band name
3- 4 A2 --- Coeff Name of the coefficients (a1-a5)
6- 11 F6.3 --- Ri/R0 Corrections for projection effects for the
disk scalelength
13- 18 F6.3 --- delta(SB0) Corrections for projection effects for the
disk central surface-brightness
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Band [BVIJK ] Band name
3- 4 A2 --- Coeff Name of the coefficients (a1-a5 b0)
6- 12 F7.3 --- Qi/Q0 Corrections for projection effects for the
disk axis-ratios
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1 A1 --- Band [BVIJK ] Band name
3- 4 A2 --- Coeff Name of the coefficients (a0-a5)
6- 11 F6.3 --- Ri/R0 Corrections for projection effects for the
disk effective radius
13- 19 F7.3 --- delta(SB0) Corrections for projection effects for the
disk central surface-brightness
21- 26 F6.3 --- ni Corrections for projection effects for the
disk Sersic index
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Byte-by-byte Description of file: tablea4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- trad [3/10] Truncation radius information:
(3R0eff or 10R0eff)
3- 7 A5 --- --- [R0eff]
9- 10 A2 --- Coeff Name of the coefficients (a0)
12 I1 --- n0 bulge Sersic index
14- 18 F5.3 --- Ri/R0 Corrections for projection effects for the
bulge effective radius
20- 24 F5.3 --- ni Corrections for projection effects for the
bulge Sersic index
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Byte-by-byte Description of file: tablea5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 A2 --- Coeff Name of the coefficients (a0)
4- 8 F5.3 --- Ri/R0 Corrections for projection effects for the
bulge effective radius
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Byte-by-byte Description of file: tableb[12345].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Band [BVIJK ] Band name
6- 8 F3.1 --- tau Central face-on optical depth
10- 11 A2 --- Coeff Name of the coefficients (a0, b0, b1)
13- 18 F6.3 --- Rapp/Ri Corrections for dust effects for the
disk scalelength
20- 27 F8.3 --- SBapp/SBi Corrections for dust effects for the
disk central surface-brightness
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tableb[6789].dat tableb10.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Band [BVIJK ] Band name
6- 8 F3.1 --- tau Central face-on optical depth
10- 11 A2 --- Coeff Name of the coefficients (a0, b0, b1)
13- 18 F6.3 --- Qapp/Qi corrections for dust effects for the disk
axis-ratio
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Byte-by-byte Description of file: tableb1[12345].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Band [BVIJK ] Band name
6- 8 F3.1 --- tau Central face-on optical depth
10- 11 A2 --- Coeff Name of the coefficients (a0-a5 b0)
13- 19 F7.3 --- Rapp/Ri corrections for dust effects for the disk
effective radius (or the disk scalelength at
inclination 1-cos(i)=0.95 for Coeff b0,
only for tau=0.8)
21- 28 F8.3 --- SBapp/SBi ?=- corrections for dust effects for the disk
central surface-brightness
30- 36 F7.3 --- napp ?=- corrections for dust effects for the disk
Sersic index
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Byte-by-byte Description of file: tableb1[6789].dat tableb2?.dat tableb30.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Band Band name
6- 8 F3.1 --- tau Central face-on optical depth
10- 11 A2 --- Coeff Name of the coefficients (a0-a5)
13- 20 F8.3 --- Rapp/Ri Corrections for dust effects for the
thin disk scalelength
22- 29 F8.3 --- SBapp/SBi Corrections for dust effects for the
thin disk central surface-brightness
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tableb3[123456789].dat tableb4[012345].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Band Band name
6- 8 F3.1 --- tau Central face-on optical depth
10- 11 A2 --- Coeff Name of the coefficients (a0-a5)
13- 19 F7.3 --- Rapp/Ri Corrections for dust effects for the
thin disk effective radius
21- 28 F8.3 --- SBapp/SBi Corrections for dust effects for the
thin disk central surface-brightness
30- 36 F7.3 --- napp Corrections for dust effects for the
thin disk Sersic index
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tableb4[6789].dat tableb5[012345].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Band [BVIJK ] Band name
6- 8 F3.1 --- tau Central face-on optical depth
10- 11 A2 --- Coeff Name of the coefficients (a0-a5)
13- 19 F7.3 --- Rapp/Ri Corrections for dust effects for the
bulge effective radius
21- 28 F8.3 --- napp Corrections for dust effects for the
bulge Sersic index
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tableb5[6789].dat tableb60.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Band [BVIJK ] Band name
6- 8 F3.1 --- tau Central face-on optical depth
10- 11 A2 --- Coeff Name of the coefficients (a0-a5)
13- 19 F7.3 --- Rapp/Ri Corrections for dust effects for the
de Vaucouleurs bulge effective radius
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Acknowledgements:
Bogdan Adrian Pastrav, bapastrav(at)uclan.ac.uk
(End) Bogdan A. Pastrav [JHI], Patricia Vannier [CDS] 02-Apr-2013