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

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

Surface Phot. NGC 4808 •

Surface Phot. NGC 4713

Surface Phot. NGC 4561

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

Metallicity • Mass-metallicity relation of Tremonti+04 • estimate Z statistically ([OII],H β , [OIII],H α , [NII],[SII]) • N2 index ([NII]/H α )

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

Further Study • Kinematics Modeling Fraternali+01

Further Study • VLA obs. in ??? ✦ D-array ✦ N4808, N4713,N4383,N4561 ✦ n HI = 3-5x10 19 cm -2 ⇒ n HI = 10 18 cm -2 • Spectroscopy? UBV imaging?

Bonus! Great Discovery!

THE END