1. Wide-Field Slitless Spectr scopy with NIRISS Van Dixon STScI TIPS/JIM 2012 September 20

2. TIPS/JIM 2012 September 20 NIRISS at a Glance ParameterValue Array Size2048 x 2048 (2040 x 2040 active) Pixel size18 μm x 18 μm Dark rate< 0.02 e-/s Noise23 e- (correlated double sample) Gain1.5 e-/ADU Field of View2.2’ x 2.2’ Plate scale in x0.0654 arcsec/pixel Plate scale in y0.0658 arcsec/pixel

3. TIPS/JIM 2012 September 20 Dual-Wheel Configuration GR150RGR150C

4. TIPS/JIM 2012 September 20 Dual-Wheel Configuration GR150RGR150C GR150R

5. TIPS/JIM 2012 September 20 Blaze Function for GR150 Grisms

6. TIPS/JIM 2012 September 20 First-Order Sensitivity: Emission Lines Minimum line flux to reach S/N = 10 in 10 ks

7. TIPS/JIM 2012 September 20 First-Order Sensitivity: Emission Lines z = 9 z = 17 Redshifted Lyman α

8. TIPS/JIM 2012 September 20 The Software  The aXe software package was developed to support slitless spectroscopy with ACS and WFC3 (Kümmel et al. 2009). aXeSIM generates synthetic direct and dispersed images of the sky. aXe extracts and calibrates spectra. aXedrizzle allows for the combination of dithered images. aXe2web displays the extracted spectra in a convenient HTML format. aXe was originally developed by the Space Telescope - European Coordinating Facility (ST-ECF). The code is now supported by STScI.  Source Extractor builds a catalog of objects from an astronomical image (Bertin & Arnouts 1996).

9. TIPS/JIM 2012 September 20 Input for aXeSIM  Configuration file Location, trace, and dispersion of each spectral order  Sensitivity (including grating) e - per erg/cm2  Throughput (w/out grating; used to make direct image)  Flat Field (may be wavelength-dependent)  Master Sky Background Image  Input Catalog (output from Source Extractor) Specify image size and shape or point to image file  Postage-stamp images  Spectra

10. TIPS/JIM 2012 September 20 Location of Each Order (F150W) -1 0 +1 +2 +3 -601 -512 -227 0 53 148 336 520 619 893 Direct Image 2040 pixels 1.03 1.3 1.7 (μm)

11. TIPS/JIM 2012 September 20 Model Object Table # 1 NUMBER Object number # 2 X_IMAGE X coordinate (pixels) # 3 Y_IMAGE Y coordinate (pixels) # 4 A_IMAGE Length of semi-major axis (pixels) # 5 B_IMAGE Length of semi-minor axis (pixels) # 6 THETA_IMAGEAngle of major axis # 7 MAG_F1537 Magnitude at 1537 nm (WFC3 F160W) # 8 SPECTEMP Key to spectral template # 9 Z Redshift # 10 MODIMAGE Key to model image 1 900.00 1500.00 0.6 0.6 0.0 22.5 0 0.0 0 2 900.00 1250.00 30.0 10.0 45.0 18.0 0 0.0 0 3 900.00 1000.00 18.0 10.0 -30.0 18.0 1 0.0 1 4 900.00 750.00 5.0 2.0 60.0 18.0 2 0.0 0 5 900.00 700.00 5.0 2.0 60.0 18.0 2 0.075 0 6 900.00 650.00 5.0 2.0 60.0 18.0 2 0.15 0 7 900.00 600.00 5.0 2.0 60.0 18.0 2 0.22 0 x y a b θ mag sp z image

12. TIPS/JIM 2012 September 20 Dispersed Image (log stretch) -1 0 +1 +2 +3 2040 pixels

13. TIPS/JIM 2012 September 20 Millennium Run Observatory H-band image using the WFC3/F160W bandpass Overzier et al. 2012 (MNRAS, in press) Semi-analytic galaxy-formation models based on the Millennium Run dark-matter simulations

14. TIPS/JIM 2012 September 20 Direct Image w/ NIRISS PSF

15. TIPS/JIM 2012 September 20 Direct Image w/ Background (100 s)

16. TIPS/JIM 2012 September 20 Source Extractor Apertures

17. TIPS/JIM 2012 September 20 Dispersed Image: Horizontal

18. TIPS/JIM 2012 September 20 Dispersed Image: Vertical

19. TIPS/JIM 2012 September 20 aXe2web