Variability of Broad and Blueshifted Component of [OIII]$λ$5007 in IZWI

Details Variability of Broad and Blueshifted Component of [OIII]$λ$5007 in IZWI Variability of Broad and Blueshifted Component of [OIII]$λ$5007 in IZWI

2005-04-04

arxiv.org/abs/astro-ph/0504076v1

New Astron. 10 (2005) 353-360

Astronomy and Astrophysics

Astrophysics

14 pages, 3 figures, NewA in press

Scientific paper

10.1016/j.newast.2005.01.002

Although the existence of asymmetrical profile of [OIII]$\lambda$5007 has been discovered for ages, its filiation and physics are poorly understood. Two new spectra of I ZWI taken on Nov 16, 2001 and on Dec 3, 2002 were compared with the spectra taken by BG92. Following results are obtained. 1)The certain variations of broad [OIII] during about 10 years separating the observations are identified. The inferred length scale of broad [OIII] emitting region ranges from 0.3pc to 3pc. By assuming a Keplerian motion in emitting region, the material emitting broad [OIII] is likely to be located at transient emission line region, between BLR and NLR. 2)We find a positive relation between the FeII emission and flux of H$\beta$(or continuum). On the other hand, the parameter RFe decreases with ionizing continuum marginally. 3)We detect a low ionized NLR in I ZWI, because of the low flux ratios $\rm{[OIII]_{n}/H\beta_{n}}$($\sim1.7$).

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