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EBHIS: All-Sky Galactic HI Survey with 100m-Class Telescope

Conducted by the Argelander Institut für Astronomie and Max-Planck-Institut für Radioastronomie, the EBHIS is an ambitious project that aims to survey Galactic and extragalactic HI emissions through a fully sampled sky coverage above a certain declination. With a 100 MHz bandwidth and high angular resolution, the survey spans 21,400 square degrees and involves 14 spectrometers with 16,384 spectral channels each. Observations started in August 2008 and concluded with the first full sky coverage in April 2013, marking a significant milestone in astronomical research.

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EBHIS: All-Sky Galactic HI Survey with 100m-Class Telescope

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  1. Jürgen Kerp1,Benjamin Winkel2, Nadya Ben Bekhti1, Shahram Faridani1, Lars Flöer1, Peter Kalberla1, Daniel Lenz1,Tobias Röhser1 1Argelander-Institut für Astronomie 2Max-Planck-Institut für Radioastronomie jkerp@astro.uni-bonn.de Effelsberg-Bonn HI Survey (EBHIS)

  2. jkerp@astro.uni-bonn.de To make an all-sky survey of Galactic 21-cm emission with a 100m-class telescope has been a dream for many decades, now the dream is finally coming true. anonymous referee

  3. jkerp@astro.uni-bonn.de • 7-beam receiver system • On-the fly observing mode • Fully sampled sky coverage above Dec = -5⁰ • EBHIS observations started in August 2008 • First full sky coverage finished in April 2013!

  4. jkerp@astro.uni-bonn.de EBHIS concept • Galactic and extragalactic HI survey in parallel: • 21.400 square degrees • 100 MHz bandwidth z ≤ 0.07 (270 Mpc) • 14 spectrometer with 16384 spectral channels each • High angular resolution → fully sampled grid 1/44 LAB • Complementary to the Parkes multi-feed survey projects (HIPASS,GASS)

  5. EBHIS concept • HVC 289+33+251 • Brüns & Westmeier 2004, A&A 426, L9 Beam filling is different ! LAB 100-m

  6. jkerp@astro.uni-bonn.de EBHIS concept

  7. jkerp@astro.uni-bonn.de Image: B. Winkel

  8. jkerp@astro.uni-bonn.de EBHIS: extragalactic science prospects

  9. jkerp@astro.uni-bonn.de EBHIS “The HI Nearby Galaxy Survey” Walter et al. 2008, AJ 136, 2563

  10. jkerp@astro.uni-bonn.de EBHIS: THINGS ensemble Kerp et al. 2013, in prep.

  11. jkerp@astro.uni-bonn.de EBHIS: THINGS ensemble Kerp et al. 2013, in prep.

  12. jkerp@astro.uni-bonn.de EBHIS: THINGS ensemble Kerp et al. 2013, in prep.

  13. jkerp@astro.uni-bonn.de EBHIS vs. THINGS: flux comparison I

  14. jkerp@astro.uni-bonn.de THINGS: NGC 3031 (M81) Walter et al. 2008, AJ 136, 2563

  15. jkerp@astro.uni-bonn.de ETHINGS: NGC 3031 (M81) ON-OFF Kerp et al. 2013, in prep.

  16. jkerp@astro.uni-bonn.de ETHINGS: NGC 3031 (M81) Background: EBHIS Inset: THINGS

  17. jkerp@astro.uni-bonn.de ETHINGS: NGC 3031 (M81) Background: EBHIS Inset: THINGS Poster: Shahram Faridani

  18. jkerp@astro.uni-bonn.de EBHIS vs. HyperLeda: flux comparison II

  19. jkerp@astro.uni-bonn.de EBHIS: Milky Way science prospects

  20. jkerp@astro.uni-bonn.de The northern polar cap (LAB) l=90⁰ l=270⁰ b=30⁰

  21. jkerp@astro.uni-bonn.de The northern polar cap (EBHIS) l=90⁰ l=270⁰ b=30⁰

  22. jkerp@astro.uni-bonn.de The northern polar cap (EBHIS) IVC Spur & Arc IVC135+53 Draco IVC 88+56

  23. jkerp@astro.uni-bonn.de The northern polar cap (EBHIS) IVC Spur & Arch IVC135+53 Draco IVC 88+56

  24. jkerp@astro.uni-bonn.de EBHIS-Planck correlation

  25. jkerp@astro.uni-bonn.de EBHIS-Planck correlation (H2 formation) Ph. D. Tobias Röhser

  26. jkerp@astro.uni-bonn.de EBHIS-Planck correlation (H2 formation) Ph. D. Tobias Röhser

  27. jkerp@astro.uni-bonn.de EBHIS-Planck correlation (H2 formation) Poster: Tobias Röhser Ph. D. Tobias Röhser

  28. jkerp@astro.uni-bonn.de The northern polar cap (EBHIS) IVC 88+56 IVC135+53 Draco IVC 88+56

  29. jkerp@astro.uni-bonn.de IVC 135+53 (velocity bridge) Lenz et al., in prep.

  30. jkerp@astro.uni-bonn.de IVC 135+53 (HVC deceleration) Lenz et al., in prep.

  31. jkerp@astro.uni-bonn.de IVC 135+53 (dust-to-gas ratio) -0.43±0.12 dex (Feige 48) Hernandez et al. 2013, submitted Lenz et al., in prep.

  32. jkerp@astro.uni-bonn.de IVC 135+53 (EBHIS-Planck → H2 map) Lenz et al., in prep. Lenz et al., in prep.

  33. jkerp@astro.uni-bonn.de IVC 135+53 (EBHIS-Planck → H2 map) Lenz et al., in prep.

  34. jkerp@astro.uni-bonn.de H2 rain? (HVC triggered IVC H2 formation?) • Towards the northern polar cap we observe about 1∙106Msun @ 500 pc altitude • Say 10% of the mass H2 • Northern polar cap 1sr • Yielding 1∙106MSunof H2 full sky • Free fall time t ~ 106 1 Msun/year (low metallicity) Extent 5 pc distance about 500 pc → 35’ @ 500 pc → 21” @ 50 kpc (LMC/SMC) → 0.3” @ 3.5 Mpc (Ursa Major) “Dark Gas” Wolfire, Hollenbach & McKee 2010, ApJ 716, 1191

  35. jkerp@astro.uni-bonn.de EBHIS products Ph. D. Lars Flöer

  36. jkerp@astro.uni-bonn.de The future: second coverage > 30⁰ Image: B. Winkel

  37. jkerp@astro.uni-bonn.de Thank you! KE757/7-1 to 7-3

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