expanding universe slides

8/20/2019 Expanding Universe Slides

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Dr. Viviana AcquavivaAssistant Professor of PhysicsCUNY City [email protected]

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Supernovae data then…

now" time # past


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and now!

now" time # past

We have since then learned that the acceleration

only started a few billion yrs ago (as expected from$

)


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What comes next?

We have a long way to explore….


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HETDEX

expect: no $

Observations starting later this year,mapping one million galaxies

at a median look-back time of10 billion yrs ago


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The Ly-! line is at rest frame " =1216 Å

Main contaminants are OII emitters(rest frame " = 3727 Å) at redshift < 0.5

Discrimination on the basis of line flux only is difficult.

Imaging survey to detect continuum(luminosity on either side of the line)

will help, but further optimization is required


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DATA(fluxes

at differentwavelengths)

INPUT

B&-,H!Hg

G,HKG&

OUTPUT

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HKK

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DATA I

KFIO- CFHAFHO-IO-

LAE

OII

O@& @&- Hg

HDj&G-@AK-, CFHAF

HO-IO-

W-E?KFKFJ @&-[

DATA II

DATA III

DATA IV

DATA V

DATA VI

OII

LAE

LAE

LAE

?;JHEK-,B

;&?EF@ -,&EO;& AK-,HO-

F&&!KFJ -H CFHA

-,& I,L@KG@

? DATA VI

"

$

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INPUT OUTPUT

1 3

2 3

3 ?

INPUT OUTPUT

one 3

two 3

three 5

four 4

five 4

six ?

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