J/MNRAS/448/3354 Spectra of quasar narrow-line regions (Tammour+, 2015)
Tracing quasar narrow-line regions across redshift:
a library of high-S/N optical spectra.
Tammour A., Gallagher S.C., Richards G.
<Mon. Not. R. Astron. Soc. 448, 3354 (2015)>
=2015MNRAS.448.3354T 2015MNRAS.448.3354T
ADC_Keywords: QSOs ; Spectroscopy
Keywords: catalogues - galaxies: active - quasars: emission lines -
quasars: supermassive black holes
Abstract:
In a single optical spectrum, the quasar narrow-line region (NLR)
reveals low density, photoionized gas in the host galaxy interstellar
medium, while the immediate vicinity of the central engine generates
the accretion disk continuum and broad emission lines. To isolate
these two components, we construct a library of high S/N optical
composite spectra created from the Sloan Digital Sky Survey
(SDSS-DR7). We divide the sample into bins of continuum luminosity and
Hβ FWHM that are used to construct median composites at different
redshift steps up to 0.75. We measure the luminosities of the
narrow-emission lines [NeV]λ3427, [NeIII]λ3870,
[OIII]λ5007, and [OII]λ3728 with ionization potentials
(IPs) of 97, 40, 35, and 13.6eV respectively. The high IP lines'
luminosities show no evidence of increase with redshift consistent
with no evolution in the AGN SED or the host galaxy ISM illuminated by
the continuum. In contrast, we find that the [OII] line becomes
stronger at higher redshifts, and we interpret this as a consequence
of enhanced star formation contributing to the [OII] emission in host
galaxies at higher redshifts. The SFRs estimated from the [OII]
luminosities show a flatter increase with z than non-AGN galaxies
given our assumed AGN contribution to the [OII] luminosity. Finally,
we confirm an inverse correlation between the strength of the
FeIIλ4570 complex and both the [OIII] EW (though not the
luminosity) and the width of the Hβ line as known from the
eigenvector 1 correlations.
Description:
This is a catalogue of 62 median optical composite spectra that we
created from subsets of spectra selected from the SDSS-DR7 with
redshift <0.75. We binned the sample according to their redshift,
L5100 and H{beta }FWHM as described in the paper (eprint
arXiv:1502.00735). This library includes only the composites that are
made of >10 spectra.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 63 84 Measured line luminosities for the four forbidden
lines [OII], [OIII], [NeIII], and [NeV]
list.dat 199 62 List of FITS average spectra
sp/* . 62 Individual FITS files
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See also:
VII/260 : The SDSS-DR7 quasar catalog (Schneider+, 2010)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- FileName Name of the composite spectrum (1)
13- 15 F3.1 --- z Centre of the redshift bin
17- 21 F5.2 10+33W LNeV ?=- Line luminosity of the [Ne V] line
23- 26 F4.2 10+33W e_LNeV ?=- rms uncertainty on LNeV
28- 32 F5.2 10+33W LNeIII ?=- Line luminosity of the [Ne III] line
34- 37 F4.2 10+33W e_LNeIII ?=- rms uncertainty on LNeIII
39- 43 F5.2 10+33W LOII ?=- Line luminosity of the [OII] line
45- 48 F4.2 10+33W e_LOII ?=- rms uncertainty on LOII
50- 55 F6.2 10+33W LOIII ?=- Line luminosity of the [OIII] line
57- 61 F5.2 10+33W e_LOIII ?=- rms uncertainty on LOIII
63 A1 --- sp [*] * indicates spectrum file in sp
sudirectory
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Note (1): Fits spectra in subdirectory sp.
n: narrow Hbeta, i: intermediate Hbeta, b: broad Hbeta.
l1: lowest L5100 bin, l10: highest L5100 bin.
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 "date" Cre.Date Creation date
12- 15 I4 0.1nm lam.min [2300] Lower value of wavelength interval
17- 20 I4 0.1nm lam.max [7000] Upper value of wavelength interval
22 I1 0.1nm dlam [1] Spectral resolution
24- 25 I2 Kibyte size [39/45] Size of FITS file
27 I1 Mm/s Hb.min [0/4] Lower range of Hβ FWHM bin
29- 30 I2 Mm/s Hb.max [2/20] Upper range of Hβ FWHM bin
32- 36 F5.2 [10-7W] Lo.min [43.15/44.63] Lower range of log(L5100)
luminosity bin [log(erg/s)]
37 A1 --- --- [-]
38- 42 F5.2 [10-7W] Lo.max [44.17/44.72] Upper range of log(L5100 )
luminosity bin [log(erg/s)]
44- 47 F4.2 --- z.min [0/0.75] Lower range of redshift bin
49- 52 F4.2 --- z.max [0.15/0.75] Upper range of redshift bin
54- 64 A11 --- FileName Name of the FITS spectrum in subdirectory sp
67-199 A133 --- Title Title of the file
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Acknowledgements:
Aycha Tammour, atammour(at)uwo.ca
History:
* 17-Mar-2015: First on-line data
* 18-Jan-2016: table3 added
(End) Aycha Tammour [Western University], Patricia Vannier [CDS] 18-Feb-2015