Variability of Broad and Blueshifted Component of [OIII]λ5007 in I ZWI
نویسندگان
چکیده
Although the existence of asymmetrical profile of [OIII]λ5007 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 Hβ(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 [OIII]n/Hβn(∼ 1.7).
منابع مشابه
Kinematic Linkage between the Broad and Narrow Line Emitting Gas in Agn
We investigate the radial velocity difference between the [OIII]λλ4959,5007 and Hβ lines for a sample of ≈ 200 low redshift AGN. We identify seven objects showing an [OIII]λ5007 blueshift relative to Hβ with amplitude larger than 250 km s (blue “outliers”). These line shifts are found in sources where the broad high ionization lines (e.g. CIVλ1549) also show a large systematic blueshift. Such b...
متن کاملRestframe Optical Spectroscopic Classifications for Submillimeter Galaxies
We report the results of a systematic near-infrared spectroscopic survey using the Subaru, VLT and Keck Telescopes of a sample of high redshift Ultra-luminous Infrared Galaxies (ULIRGs) mainly composed of submillimeter-selected galaxies. Our observations span the restframe optical range containing nebular emission lines such as Hβ, [Oiii]λλ4959, 5007, and [Oii]λ3727, which are essential for mak...
متن کاملRz2109 and Implications for the Mass of Its Black Hole X-ray Source
We present Keck LRIS spectroscopy of the black hole-hosting globular cluster RZ2109 in the Virgo elliptical galaxy NGC 4472. We find that this object has extraordinarily broad [O III]λ5007 and [O III]λ4959 emission lines, with velocity widths of approximately 2,000kms. This result has significant implications for the nature of this accreting black-hole system and the mass of the globular cluste...
متن کاملExtended line emission around seven radio - loud quasars at redshift z ∼ 2
We present near-infrared spectra of seven radio-loud quasars with a median red-shift of 2.1, five of which were previously known to have Lyα nebulae. Extended [OIII]λ5007 and Hα emission are evident around six objects, at the level of a few times 10 −16 erg cm −2 arcsec −2 s −1 within ≃ 2 arcsec of the nucleus (≡ 16 kpc in the adopted cosmology). Nuclear [OII]λ3727 is detected in three of the 5...
متن کاملEmission line outflows in PKS 1549 - 79 : the effects of the early stages of radio source evolution ?
We present new spectroscopic observations of the southern radio galaxy PKS154979 (z = 0.152). Despite the flat spectrum character of the radio emission from this source, our optical spectra show no sign of the broad permitted lines and non-stellar continuum characteristic of quasar nuclei and broad line radio galaxies. However, the high ionization forbidden lines, including [OIII]λλ5007,4959, a...
متن کامل