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         Çѱ¹Áö±¸°úÇÐȸ(Ãæ³²´ë, 4¿ùÁß), Çѱ¹Ãµ¹®ÇÐȸ(°æÈñ´ëÇб³,  4¿ù), Çѱ¹¿ìÁÖ°úÇÐȸ(°æÁÖ, 4¿ù) ¿­¸±¿¹Á¤ÀÓ




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¿¬±¸ °ü½É ºÐ¾ß  

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õ¹®ÇÐÀÚ

¡¡¿¬±¸/ÁöµµÁßÀÎ ´ëÇпø»ý  

ÀÌ ¸§

°úÁ¤

¿¬±¸ºÐ¾ß

¼Ò¼Ó, ±âŸ"

À̰­È¯

 ¹Ú»ç°úÁ¤

°ø»ýº°(Symbiotic stars)

ÃæºÏ´ë Áö±¸°úÇаú, ¼¼±¤°í

ÇÑÇý¸²,°­Àº¾Æ

 ¼®»ç°úÁ¤

½ÃÀÌÆáÀºÇÏ (ÇÒµ¿ÀºÇÏÇÙ)

±³»ç

À̼±ÁÖ,Á¶ÁöÀº

 ¼®»ç°úÁ¤

Ç༺»ó¼º¿î

"±èÀμö,À̹ÎÇý, ÀÌÀ絿"

À̼±¾Æ,¾È¿µ±Õ

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°ø»ýº°

"ÇÑ»ó¶ó,  ¹é½Âȯ"

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õ¹®Çп¡ °üÇÑ ¼Ò°³

Our objective is to investigate the gaseous state of the PNs, galaxies and AGNs, utilizing the spectrographic and narrow filter imaging techniques.  Many strategically important diagnostic lines of these celestial objects, e.g. [OIII]4959/5007,4363, [OII]3727, [SII]6717/31, obtainable with the medium to high dispersion spectrometer, would provide an useful information on the physical states. Planetary nebulae, symbiotic stars, and super nova remnants could be studied with relatively small aperture telescopes such as BOAO 1.8m telescope, while AGNs, such as those of Seyferts and Quasars, may require a relatively large aperture telescope. To achieve our goal, we plan to obtain the observing time of the large optical telescopes.  The other approach is to study the narrow band images using the computer simulation technique of hydrodynamic codes.

We have carried out the research program  on PNe and symbiotics, mainly collaborating with Lawrence H. Aller (UCLA) and Walter A. Feibelman (NASA) using the Lick 3-m telescope. Our study on the galaxies began with the nearby Seyfert galaxies from Malkan et al.'s recent HST survey list (1998). According to the unified hypothesis, the viewing direction causes the difference between Seyfert 1s and Seyfert 2s, while the statistical result contradicts this popular scheme.  The other possibility would be that the  excess galactic dust may absorb the BLR emission of Seyfert 2s. With a number of HST archive images of nearby Seyfert galaxies, we try to find the nature and location of the absorbers in Seyfert 2s.  We also try to find the connection between the  morphologies of circumnuclear region and host galaxy.  We investigated the HST WFPC2 (gaseous) and NICMOS (dust) imagings  of nuclear regions to see whether the strong barred potentials exist, whose presence might indicate a primary mechanism of driving gas into the nuclear region. Since the gas easily transfers angular momentum to stars in strong bars, inner bars are likely candidates.  We also investigate whether spiral arms which can be traced to the nucleus up to the limit of a few 10 pc (<0.1") can be a possible fueling mechanism. The velocity field of the ionized gas, secured with the adoptive optic imaging spectrograph, e.g.  CFHT/OASIS,  may provide a clue on  the accretion  flows or outflows of Seyfert AGNs.

ÁøÇàÁßÀÎ ¿¬±¸ °úÁ¦µé

Specific goals are :

1) to study the formation and chemical evolution history of the Galactic PNe, constructing photo-ionization and gas-dynamic models;

2) to investigate chemical enrichments (by spectroscopically observing PNe, HII regions, SNRs) in nearby galaxies (such as M31 and M32)

3) to investigate the formation and evolution of distant galaxies and active galactic nuclei, utilizing the spectroscopic observational results.

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Research Areas

Spectroscopy of Planetary Nebulae (PNe)

Hydrodynamic Simulation of PNe and AGNs (w/ SeongJae Lee, Dongsu Ryu)

Active Galactic Nuclei (AGNs)  (w/ Dr. Pierre Ferruit. DongHoon, Son, SeongJae Lee, )

Evolutionary connection between Planetary-Formation and Interstellar Matter

Symbiotic Stars (w/KangWhan, Lee..)

Supernova Remnants (SAI Supernova Catalog)  

H II regions/Planetary Nebulae in Nearby Galaxies (w/ Her, Seung-Jae, SooRyeon Han, YoungKwang Kim)

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Recent Publications

2010

2009

 

2008


 

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