New large-scale CIB maps from Planck

Lunch Colloquium at the University of Bonn/Max-Planck-Institute for Radio Astronomy on new large-scale CIB maps from Planck.

Transcript

1. New large-scale CIB maps from Planck data in collaboration with O. Doré, B. Hensley, G. Lagache Daniel Lenz Lunch Colloquium @MPIfR/AIfA June 6 © 2018 California Institute of Technology. Government sponsorship acknowledged.
2. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Conclusions ❖ New CIB maps for 25% of the sky, 4 Planck bands ❖ Fewer systematics, larger sky fraction than previous studies ❖ Powerful for cross- correlations and de- lensing !2
3. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data What is the CIB? Cosmic infrared background (CIB): Made up from dust in galaxies at z=1-3 Extragalactic background light !3
4. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data What is the CIB? Cosmic infrared background (CIB): Made up from dust in galaxies at z=1-3 Extragalactic background light !3
5. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Schmidt+ (2015) ❖ Strong constraints on star formation history ❖ Probe dust temperature across cosmic times ❖ Understand star formation in DM halos !4 Why study the CIB? Star-formation!
6. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Why study the CIB? Grav. lensing! ❖ Large-scale structure induces weak gravitational lensing !5
9. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Manzotti (2017) Why study the CIB? Grav. lensing! ❖ CIB kernel and the CMB lensing kernel are well matched !8
10. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Planck collaboration (2013, XVII) !9 Why study the CIB? Grav. lensing! ❖ Cross-correlation of CIB and CMB lensing strongly detected in Planck data ❖ Lots of room for improvement: Sky fraction, CIB data, new CMB lensing map
11. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data How to obtain CIB maps? ❖ Galactic thermal dust and CIB dust dominate on large scales at ~200 to 1000 GHz ❖ How to disentangle them? !10
12. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data How to obtain CIB maps? A. Fit different frequency channels with modified blackbody spectra B. Utilize the different angular power spectra of these components C. Use template maps of Galactic dust (e.g. HI-based) ❖ Galactic thermal dust and CIB dust dominate on large scales at ~200 to 1000 GHz ❖ How to disentangle them? !10
13. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Correlation of dust and gas HI Dust Linear relation to first order, but better model required to get to CIB levels !11
14. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Planck data !12
15. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data HI4PI Survey ❖ Merges data from Effelsberg and Parkes ❖ Replaces LAB as state-of-the-art full-sky HI survey ❖ Higher sensitivity & resolution, fewer systematics, full sampling 20 21 22 log(NHI [cm 2]) 180 135 90 45 0 315 270 225 180 60 30 0 30 60 HI4PI collaboration
 (2017) !13
18. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Two challenges !15 ❖ Spectrally ❖ O(1000) velocity channels in HI ❖ Need to control overfitting
19. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Two challenges ❖ Spatially ❖ Dust-to-gas ratios vary over the sky ❖ Need to preserve large-scale CIB power !15 ❖ Spectrally ❖ O(1000) velocity channels in HI ❖ Need to control overfitting
20. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data HI-based dust models • • Velocity separation difficult for complex structures and large scales Radial Velocity HVC IVC LVC I = ✏HVC NHVC + ✏IVC NIVC + ✏LVC NLVC !16
21. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data • Generalised linear model (GLM) • Radial Velocity I = X i ✏iTi B !17 HI-based dust models
22. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data • Generalised linear model (GLM) • • Regularised: • • Accounts for all features along line of sight I = X i ✏iTi B Radial Velocity |Datai Modeli |2 + ↵ · |✏i | !18 HI-based dust models
23. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Large-scale bias !19 Input CIB
24. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Large-scale bias !19 Mean per field Input CIB
25. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Large-scale bias !19 Mean per field After mean subtraction Input CIB
26. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Large-scale bias !20 Large scales Small scales
27. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Large-scale bias !20 ❖ Separating one region at a time removes large-scale power ❖ Not properly recognized before ❖ Essential for CIB reconstruction at low l Large scales Small scales
28. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Spatial selection ❖ Build dust models that preserve large-scale power ❖ Use consistency checks and cross correlations ❖ Difficult trade-off! !21 Offsets in the HI/ dust correlation
29. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Spatial selection !22 Offsets in the HI/ dust correlation (smoothed) ❖ Build dust models that preserve large-scale power ❖ Use consistency checks and cross correlations ❖ Difficult trade-off!
30. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Results: Maps !23 (preliminary)
31. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Smaller regions !24
32. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Large-scale CIB maps !25
33. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Comparison to earlier work !26
34. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Based on spatial information: GNILC ❖ Power-spectrum based ❖ Designed to remove CIB from Galactic dust maps ❖ Over-subtraction of CIB Planck (2016 XLVIII !27
35. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data HI-based: Planck (2014 XXX) ❖ ~10 individual fields, HI data from the GBT ❖ Two larger fields from EBHIS and GASS ❖ One field cleaned at a time ❖ Manual fine-tuning !28
36. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Comparison to earlier work: Small fields ❖ Very similar morphologies despite totally different spatial selections ❖ Yet differences remain! MJy/sr !29
37. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Comparison to earlier work: Small fields ❖ Very similar morphologies despite totally different spatial selections ❖ Yet differences remain! MJy/sr !29
38. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Comparison to earlier work: Small fields ❖ Differences can be partially attributed to the underlying HI data ❖ Radial velocity cuts have strong effect !30
39. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Comparison to earlier work: Small fields !31
40. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Comparison to earlier work: Small fields !31
41. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Comparison to earlier work: Large field Planck (2014 XXX) This work !32
42. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Comparison to earlier work: Large field Planck (2014 XXX) This work Planck 2014 - This work !32
43. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Comparison to earlier work !33 Power spectra
44. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data CIB - CMB lensing cross power !34
45. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Conclusions ❖ Large-scale Planck CIB maps for 5 frequencies ❖ Significant improvement in component separation ❖ Much better understanding of systematics ❖ Large scales are challenging! !35
46. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Conclusions ❖ Large-scale Planck CIB maps for 5 frequencies ❖ Significant improvement in component separation ❖ Much better understanding of systematics ❖ Large scales are challenging! ❖ CIB is powerful probe of large-scale structure ❖ Study cosmic star-formation ❖ De-lensing for current and future CMB experiments !35
47. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data The next generation of space-based CMB probes PICO !36
48. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Probe of Inflation and Cosmic Origins !37 ❖ NASA’s preparation for the 2020s ❖ Set up 8 Probe Missions studies; $400M - $1000M* *The cost information contained in this document is of a budgetary and planning nature and is intended for informational purposes only. It does not constitute a commitment on the part of JPL and/or Caltech.
49. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Probe of Inflation and Cosmic Origins ❖ PICO ❖ 21 bands, 21-800 GHz, full polarization ❖ 1.4m -> 38’ to 1’ ❖ 5yr survey -> 0.6 uK arcmin RMS full sky ❖ Planck: 50 uK (full sky) ❖ CMB-S4: 0.8 uK (3% sky) !37 ❖ NASA’s preparation for the 2020s ❖ Set up 8 Probe Missions studies; $400M - $1000M* *The cost information contained in this document is of a budgetary and planning nature and is intended for informational purposes only. It does not constitute a commitment on the part of JPL and/or Caltech.
50. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Probe of Inflation and Cosmic Origins !38 ❖ Key science: CMB B-modes, tensor-to-scalar ratio r ❖ Dominated by foregrounds
51. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Thank you! !39
52. Daniel Lenz, JPL/Caltech Large-scale CIB maps from Planck data Based on spatial information: GNILC Planck (2016 XLVIII !40