Effelsberg-Bonn HI Survey (EBHIS) Jürgen Kerp 1,Benjamin Winkel 2, Nadya Ben Bekhti 1, Shahram Faridani 1, Lars Flöer 1, Peter Kalberla 1, Daniel Lenz.

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Presentation transcript:

Effelsberg-Bonn HI Survey (EBHIS) Jürgen Kerp 1,Benjamin Winkel 2, Nadya Ben Bekhti 1, Shahram Faridani 1, Lars Flöer 1, Peter Kalberla 1, Daniel Lenz 1,Tobias Röhser 1 1 Argelander-Institut für Astronomie 2 Max-Planck-Institut für Radioastronomie

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

7-beam receiver system On-the fly observing mode Fully sampled sky coverage above Dec = -5 ⁰ EBHIS observations started in August 2008 First full sky coverage finished in April 2013!

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

EBHIS concept HVC Brüns & Westmeier 2004, A&A 426, L9 Beam filling is different ! LAB 100-m

EBHIS concept

Image: B. Winkel

EBHIS: extragalactic science prospects

EBHIS “The HI Nearby Galaxy Survey” Walter et al. 2008, AJ 136, 2563

EBHIS: THINGS ensemble Kerp et al. 2013, in prep.

EBHIS: THINGS ensemble Kerp et al. 2013, in prep.

EBHIS: THINGS ensemble Kerp et al. 2013, in prep.

EBHIS vs. THINGS: flux comparison I

THINGS: NGC 3031 (M81) Walter et al. 2008, AJ 136, 2563

ETHINGS: NGC 3031 (M81) Kerp et al. 2013, in prep. ON-OFF

ETHINGS: NGC 3031 (M81) Background: EBHIS Inset: THINGS

ETHINGS: NGC 3031 (M81) Background: EBHIS Inset: THINGS Poster: Shahram Faridani

EBHIS vs. HyperLeda: flux comparison II

EBHIS: Milky Way science prospects

The northern polar cap (LAB) b=30 ⁰ l=270 ⁰ l=90 ⁰

The northern polar cap (EBHIS) b=30 ⁰ l=270 ⁰ l=90 ⁰

The northern polar cap (EBHIS) IVC Draco IVC IVC Spur & Arc

The northern polar cap (EBHIS) IVC Draco IVC IVC Spur & Arch

EBHIS-Planck correlation 24

EBHIS-Planck correlation (H 2 formation) Ph. D. Tobias Röhser 25

EBHIS-Planck correlation (H 2 formation) Ph. D. Tobias Röhser 26

EBHIS-Planck correlation (H 2 formation) Ph. D. Tobias Röhser 27 Poster: Tobias Röhser

The northern polar cap (EBHIS) IVC Draco IVC 88+56

IVC (velocity bridge) Lenz et al., in prep.

IVC (HVC deceleration) Lenz et al., in prep.

IVC (dust-to-gas ratio) -0.43±0.12 dex (Feige 48) Hernandez et al. 2013, submitted Lenz et al., in prep.

IVC (EBHIS-Planck → H 2 map) Lenz et al., in prep.

IVC (EBHIS-Planck → H 2 map) Lenz et al., in prep.

H 2 rain? (HVC triggered IVC H 2 formation?) 1.Towards the northern polar cap we observe about 1 ∙ 10 6 M 500 pc altitude 2.Say 10% of the mass H 2 3.Northern polar cap 1sr 4.Yielding 1 ∙ 10 6 M Sun of H 2 full sky 5.Free fall time t ~ M sun /year (low metallicity) Extent 5 pc distance about 500 pc → 500 pc → 50 kpc (LMC/SMC) → 3.5 Mpc (Ursa Major) “Dark Gas” Wolfire, Hollenbach & McKee 2010, ApJ 716, 1191

EBHIS products 35 Ph. D. Lars Flöer

The future: second coverage > 30 ⁰ Image: B. Winkel

Thank you! KE757/7-1 to 7-3