HI Rich Galaxies Probing Gas Accretion Joo Heon Yoon Jacqueline - - PowerPoint PPT Presentation

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Aug 29, 2022 362 likes •542 views

HI Rich Galaxies Probing Gas Accretion Joo Heon Yoon Jacqueline van Gorkom Virgo HI-rich Galaxies N4713 N4383 N4772 N4561 N4808 Samples Image Credit: Aeree Chung Faint Tail of NGC4808 15~90kpc V-band Imaging To find extended

SLIDE 1

HI Rich Galaxies

Probing Gas Accretion

Joo Heon Yoon Jacqueline van Gorkom

SLIDE 2

Virgo HI-rich Galaxies

N4383 N4561 N4713 N4772 N4808

SLIDE 3

Samples

Image Credit: Aeree Chung

SLIDE 4

Faint Tail

f NGC4808

15’~90kpc

SLIDE 5

V-band Imaging

To find extended light
1.3m McGraw-Hill
Feb. 13th ~ Feb. 17th, 5 nights
4x10min exposure for each target + sky

SLIDE 6

SLIDE 7

Surface Phot.

NGC 4808

SLIDE 8

Surface Phot.

NGC 4713

SLIDE 9

Surface Phot.

NGC 4561

SLIDE 10

Problems

V-band 2nd Skyflat 1st flat/2nd flat NGC4713

SLIDE 11

Metallicity

Mass-metallicity relation of Tremonti+04
estimate Z statistically ([OII],Hβ,

[OIII],Hα, [NII],[SII])

N2 index ([NII]/Hα)

SLIDE 12

Result

HI ➣ Found faint HI tail
V-band Imaging ➣ Not promising
Spectroscopy ➣ something is going on.

SLIDE 13

Further Study

Kinematics Modeling

Fraternali+01

SLIDE 14

Further Study

VLA obs. in ???

✦ D-array ✦ N4808, N4713,N4383,N4561 ✦ nHI = 3-5x1019cm-2 ⇒ nHI = 1018cm-2

Spectroscopy? UBV imaging?

SLIDE 15

Bonus! Great Discovery!

SLIDE 16

THE END

SLIDE 17