| 10 | | The objects of interest are simulated galaxies which are described by the following parameters |
| 11 | | |
| 12 | | {{{ |
| 13 | | - x y centre of object in pixels |
| 14 | | - mag total magnitude |
| 15 | | - bt build/disk ratio |
| 16 | | - br bulge effective radii (half light arcsec) |
| 17 | | - bi bulge inclination (always 1 in this sample) |
| 18 | | - ba bulge position angle |
| 19 | | - dl disk scale length (arcsec) |
| 20 | | - di disk inclincation (always 1 in this sample) |
| 21 | | - da disk position angle |
| 22 | | - z redshift |
| 23 | | - ht hubble type (10 for pure disks, -6 for pure bulges) |
| 24 | | }}} |
| 25 | | |
| 26 | | These images were run though psphot using the STACKPHOT recipe. The parameters for the set of sources psphot selected for extended source fitting were |
| 27 | | matched by coordinates to the list of simulated galaxies. In the following sections we examine the fits for the 3 different models. |
| 28 | | We concentrate mostly on the simple galaxy models, pure disks (exponential profile) and and pure bulges (de Vaucouleur 1/4 profile). |
| 29 | | |
| 30 | | == Sersic Model == |
| 31 | | |
| 32 | | {{{ |
| 33 | | I(r) = I(0) exp[ -k * R ** (1 / m) ] |
| 34 | | |
| 35 | | psphot extended source parameters measured for PS_MODEL_SERSIC |
| 36 | | EXT_INST_MAG |
| 37 | | EXT_WIDTH_MAJ |
| 38 | | EXT_WIDTH_MIN |
| 39 | | EXT_THETA |
| 40 | | EXT_PAR_07 (0.5 / m) |
| 41 | | }}} |
| 42 | | |
| 43 | | Since all of the simulated galaxies in this sample have bulge inclination == 1 and disk inclination == 1, |
| 44 | | the major an minor axes should be equal and the angle will |
| 45 | | unmeasurable due to noise. |
