J/ApJS/189/15 FeII emission in a sample of AGN spectra (Kovacevic+, 2010)
Analysis of optical Fe II emission in a sample of active galactic nucleus
spectra.
Kovacevic J., Popovic L.C., Dimitrijevic M.S.
<Astrophys. J. Suppl. Ser., 189, 15-36 (2010)>
=2010ApJS..189...15K 2010ApJS..189...15K
ADC_Keywords: Atomic physics ; Active gal. nuclei ; Redshifts ;
Equivalent widths
Keywords: atomic processes - galaxies: active - quasars: emission lines
Abstract:
We present a study of optical FeII emission in 302 active galactic
nuclei (AGNs) selected from the Sloan Digital Sky Survey. We group the
strongest FeII multiplets into three groups according to the lower
term of the transition (b4F, a6S, and a4G terms). These
approximately correspond to the blue, central, and red parts,
respectively, of the "iron shelf" around Hβ. We calculate an FeII
template that takes into account transitions into these three terms
and an additional group of lines, based on a reconstruction of the
spectrum of I Zw 1. This FeII template gives a more precise fit of the
FeII lines in broad-line AGNs than other templates. We extract FeII,
Hα, Hβ, [OIII], and [NII] emission parameters and
investigate correlations between them. We find that FeII lines
probably originate in an intermediate line region. We note that the
blue, red, and central parts of the iron shelf have different relative
intensities in different objects. Their ratios depend on continuum
luminosity, FWHM Hβ, the velocity shift of FeII, and the
Hα/Hβ flux ratio. We examine the dependence of the
well-known anti-correlation between the equivalent widths of FeII and
[OIII] on continuum luminosity. We find that there is a Baldwin effect
for [OIII] but an inverse Baldwin effect for the FeII emission. The
[OIII]/FeII ratio thus decreases with Lλ5100. Since the ratio
is a major component of the Boroson & Green Eigenvector 1 (EV1), this
implies a connection between the Baldwin effect and EV1 and could be
connected with AGN evolution. We find that spectra are different for
Hβ FWHMs greater and less than ∼3000km/s, and that there are
different correlation coefficients between the parameters.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table12.dat 439 302 Parameters used in analysis of 302 AGN sample
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See also:
VI/48 : Fe II Reference Catalogue (Viotti+ 1988)
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
J/A+A/309/81 : X-ray properties of AGN (Wang+, 1996)
Byte-by-byte Description of file: table12.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- SDSS SDSS name (HHMMSS.ss+DDMMSS.ss)
21- 28 F8.6 --- z Redshift
30- 36 F7.4 [10-7W] logLc Log Lc 5100Å continuum luminosity
38- 47 F10.4 10+33W LHb Total Hβ line luminosity (1040erg/s)
49- 57 F9.4 km/s WHb Hβ FWHM; broad component only
59- 66 F8.4 km/s W-NHb Width of Hβ NLR (Narrow Line Region) and
central [OIII] component (1)
68- 76 F9.4 km/s S-NHb Shift of Hβ NLR and central [OIII]
component
78- 83 F6.4 --- R-NHb Ratio of Hβ NLR to total Hβ
85- 93 F9.4 km/s W-IHb Width of Hβ ILR (Intermediate Line
Region)
95-104 F10.4 km/s S-IHb Shift of Hβ ILR
106-111 F6.4 --- R-IHb Ratio of Hβ ILR to total Hβ
113-121 F9.4 km/s W-VBHb Width of Hβ VBLR (Very Broad Line Region)
123-132 F10.4 km/s S-VBHb Shift of Hβ VBLR
134-139 F6.4 --- R-VBHb Ratio of Hβ VBLR to total Hβ
141-146 F6.4 --- R-O3 Ratio of [OIII] 5007Å to total Hβ (2)
148-156 F9.4 km/s W-Fe2 Width of FeII
158-167 F10.4 km/s S-Fe2 Shift of FeII
169-174 F6.4 --- R-Fe2t Ratio of total FeII to total Hβ (3)
176-181 F6.4 --- R-Fe2F Ratio of FeII F to total Hβ
183-188 F6.4 --- R-Fe2S Ratio of FeII S to total Hβ
190-195 F6.4 --- R-Fe2G Ratio of FeII G to total Hβ
197-202 F6.4 --- R-Fe2Zw Ratio of FeII 1 Zw I to total Hβ (4)
204-212 F9.4 km/s W-He2 Width of HeII
214-223 F10.4 km/s S-He2 Shift of HeII
225-230 F6.4 --- R-He2 Ratio of HeII to total Hβ
232-238 F7.4 0.1nm EW-NHb Equivalent width of NLR Hβ
240-246 F7.4 0.1nm EW-IHb Equivalent width of ILR Hβ
248-255 F8.4 0.1nm EW-VBHb Equivalent width of VBLR Hβ
257-264 F8.4 0.1nm EW-O3 Equivalent width of [OIII] 5007Å
266-272 F7.4 0.1nm EW-Fe2F Equivalent width of FeII F
274-280 F7.4 0.1nm EW-Fe2S Equivalent width of FeII S
282-288 F7.4 0.1nm EW-Fe2G Equivalent width of FeII G
290-296 F7.4 0.1nm EW-Fe2Zw Equivalent width of FeII 1 Zw I (4)
298-305 F8.4 --- R-Ha ?=-99.999 Ratio of total Hα to total
Hβ
307-314 F8.4 km/s W-Ha ?=-99.999 Width of Hα and [NII] (5)
316-324 F9.4 km/s S-Ha ?=-99.999 Shift of Hα and [NII] (5)
326-333 F8.4 --- R-NHa ?=-99.999 Ratio of NLR Hα to total
Hβ
335-343 F9.4 km/s W-IHa ?=-99.999 Width of ILR Hα
345-354 F10.4 km/s S-IHa ?=-99.999 Shift of ILR Hα
356-363 F8.4 --- R-IHa ?=-99.999 Ratio of ILR Hα to total
Hβ
365-373 F9.4 km/s W-FBHa ?=-99.999 Width of VBLR Hα
375-384 F10.4 km/s S-FBHa ?=-99.999 Shift of VBLR Hα
386-393 F8.4 --- R-BHa ?=-99.999 Ratio of VBLR Hα to total
Hβ
395-402 F8.4 --- R-N2 ?=-99.999 Ratio of [NII] 6583Å to total
Hβ
404-411 F8.4 0.1 EW-NHa ?=-99.999 Equivalent width of NLR Hα
413-421 F9.4 0.1 EW-IHa ?=-99.999 Equivalent width of ILR Hα
423-430 F8.4 0.1 EW-VBHa ?=-99.999 Equivalent width of VBLR Hα
432-439 F8.4 0.1 EW-N2 ?=-99.999 Equivalent width of [NII] 6583Å
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Note (1): Both [OIII] lines (4959 and 5007) are fitted with two Gaussians,
central, and shifted.
Note (2): [OIII] 5007 = central and shifted component of [OIII] 5007
line included.
Note (3): (FeII total) = all FeII lines within range 4400-5500 Angstroms.
Note (4): (FeII 1 Zw 1)= group of lines with relative intensities
obtained from 1 Zw I.
Note (5): It is the same width and shift as of Hb NLR and [OIII] except
in a few objects.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 06-Sep-2010