1. Ariel Bowers (Baltimore Polytechnic Institute) Max Mutchler (Space Telescope Science Institute) Version 21 Dec 2007 Hubble imaging of the Carina Nebula

2. Ariel Bowers (Baltimore Polytechnic Institute) Max Mutchler (Space Telescope Science Institute)

3. Hubble imaging of the Carina Nebula Hubble programs 10241 and 10475; Principal Investigator Nathan Smith (UC-Berkeley) Large ACS H-alpha mosaic covering Trumpler 14 and 16: 48 pointings with F658N filter (H- alpha and N II) Separate smaller fields: HH666, NGC 3324, POS 19-30 WFPC2 parallel F656N, F673N exposures

5. Location of the main mosaic in the Carina Nebula North

6. Hubble observing programs 10241 and 10475 (PI Nathan Smith) ACS primary pointings are blue, WFPC2 parallel pointings are pink North

7. 20 22 21 23 24 26 27 HH666 25 19 30 28 Carina Nebula ACS mosaic fields (excluding NGC 3324) Tr 16 Tr 14 North

8. Tr 14 Tr 16 Tr 15 Carina Nebula WFC2 F656N fields (excluding NGC 3324)

9. Main mosaic drizzling Main mosaic 15x27 arcminutes: too big! Make 4 slightly overlapping sub-mosaics: 13x7 arcminutes with North at -40 degrees (320 degrees) Make 2 alternate North-up sub-mosaics: 11x9 arcminutes centered on Trumpler 14 and 16 Make full mosaic at quarter-scale; or half-scale to match WFPC2 data? Some small featured fields, e.g Tr14 jets

10. Main mosaic: 48 pointings 15 x 27 arcminutes North 320 deg (-40 deg) c4f7 c3ec c2do c1d0 b4f3 b3e8 b2dk b1cw b4ez b3e4 b2dg b1cs c8h2 c7e4 c6be c5aq b8gy b7e0 b6ba b5am b8gu b7dw b6b6 b5ai a4ev a3e0 a2dc a1co 04er 03dw 02d8 01ck 04eo 03dt 02d5 01ch a8gq a7ds a6b2 a5ae 08gm 07do 06ay 05aa 08gj 07dl 06av 05a7 15’ 27’

11. 4 sub-mosaics: 13 x 7 arcminutes 15600 x 8400 pixels North 320 deg (-40 deg) carina14a_n05 carina14b_n05 7’ 13’ carina16a_n05 carina16b_n05

12. Full mosaic at low-resolution (scale 0.10 or 0.20) 15 x 27 arcminutes North 320 deg (-40 deg) 27’ 15’ carina10_n20

13. Alternate North-up sub-mosaics 11x9 arcminutes 13200x10800 pixels Smaller featured fields 4x3 arcmin North carina14_n05 14j carina16_n05

14. Image registration Choose arbitrary reference image (0,0) Identify minimal number of “intertiles” and smallest image dimensions needed for shift measurement, i.e. the “backbone” Drizzle single intertile images: run pretweak script to make single_sci images Measure shifts between intertile images using stars in overlap areas (with imexam) Re-drizzle single intertile images using shifts, iterate for outer frames Run tweakshifts? Not enough stars? Try cross correlation instead? Align to some astrometric standard?

15. Sub-mosaic registration backbone 3 x 14 arcminutes 3600 x 16800 pixels North 320 deg (-40 deg) 27’ 15’

16. reference (0,0): j900b2dgq Carina mosaic 14a: reference image, intertile shift measurement

17. MultiDrizzle: combine and clean Applies geometric distortion correction Combines images: N total for main mosaic Rejects cosmic rays and detector artifacts Visually inspect and verify: blink drz, weight, and sum images Iterate: experiment with parameters, re-drizzle Make smaller low-resolution versions (scale 0.20); cosmetic fill for missing via interpolation (mainly for “quick-look”, educational purposes, and nice graphics)

18. Sub-mosaic Trumpler 14a 14400x8400 pixels = 13x7 arcminutes North

19. Featured field: Trumpler 14 jets 4800x3600 pixels = 4x3 arcmin North down here

20. Featured field: Trumpler 14 jets 4800x3600 pixels = 4x3 arcmin North down here, with cosmetic fill

21. Carina Nebula HH666 field

22. Carina Nebula HH666 jets

23. Carina Nebula HH666 field: proplyds

24. MAST High Level Science Products (HLSP) ACS full-scale (0.05): 4 main sub-mosaics, HH666, NGC 3324, POS… WFPC2 full scale (0.10): main mosaic, other fields ACS half-resolution (0.10): monolithic main mosaic; also matches WFPC2 scale Eta Carina sub-sampled HRC? Preview GIF images README file, PASP paper http://archive.stsci.edu/hst/carina/

25. http://archive.stsci.edu/prepds/heritage/ High Level Science Products (HLSP)