Images
| Filename | Description | Content | SDP Pipeline |
|---|---|---|---|
| acis_cntr_img2.fits | high-resolution image of the center of the field |
HIRESIMG | ACIS2 |
| hrc_cntr_img2.fits | high-resolution image of the center of the field |
HIRESIMG | HRC2 |
| acis_full_img2.fits | full-field sky image | LORESIMG | ACIS2 |
| hrc_full_img2.fits | full-field sky image | LORESIMG | HRC2 |
The creation process for the two types of images in the same for ACIS and HRC.
High-resolution Image
| Filename | Description | Content | SDP Pipeline |
|---|---|---|---|
| acis_cntr_img2.fits | high-resolution image of the center of the field |
HIRESIMG | ACIS2 |
| hrc_cntr_img2.fits | high-resolution image of the center of the field |
HIRESIMG | HRC2 |
Description:
A 1024x1024 pixel image of the center of the field at full resolution (~0.5 arcsec/pixel). The field is centered at the target position of the observation. This image is created from the level=2 event file, which is filtered for bad pixels, bad times, etc. The array axes are specified in sky(x,y) coordinates (for more information, see the coords ahelp file).
Creator pipeline: acis_L2
dmcopy - the image may be recreated by using dmcopy on the level=2 event file with a region of 1024x1024 pixels centered at the target position.
unix% dmcopy "evt2.fits[sky=region(field.reg)]" image.fits
IMAGE-specific columns:
| Column Name | Units | Description |
|---|---|---|
| IMAGE[1024,1024] | counts | an array of the counts |
Full-field Sky Image
| Filename | Description | Content | SDP Pipeline |
|---|---|---|---|
| acis_full_img2.fits | full-field sky image | LORESIMG | ACIS2 |
| hrc_full_img2.fits | full-field sky image | LORESIMG | HRC2 |
Description:
An image of the whole field of an observation, centered at the target position of the observation. The image size depends on the detector:
| Detector | Bin Factor | Image Size (pixels) |
|---|---|---|
| ACIS | 8 | 1024x1024 |
| HRC-I | 32 | 1024x1024 |
| HRC-S | 32 | 2048x2048 |
The array axes are specified in sky(x,y) coordinates (for more information, see the coords ahelp file).
Creator pipeline: acis_L2
dmcopy - the image may be recreated by using dmcopy on the level=2 event file with the binning from the table, above.
unix% dmcopy "acis_evt2.fits[bin sky=8]" acis_image.fits
IMAGE-specific columns:
| Column Name | Units | Description |
|---|---|---|
| IMAGE[1024,1024] | counts | an array of the counts |