2016A&A...585A..87S


C.D.S. - SIMBAD4 rel 1.7 - 2020.03.30CEST10:24:22

2016A&A...585A..87S - Astronomy and Astrophysics, volume 585A, 87-87 (2016/1-1)

An X-Shooter composite of bright 1 < z < 2 quasars from UV to infrared.

SELSING J., FYNBO J.P.U., CHRISTENSEN L. and KROGAGER J.-K.

Abstract (from CDS):

Quasi-stellar object (QSO) spectral templates are important both to QSO physics and for investigations that use QSOs as probes of intervening gas and dust. However, combinations of various QSO samples obtained at different times and with different instruments so as to expand a composite and to cover a wider rest frame wavelength region may create systematic effects, and the contribution from QSO hosts may contaminate the composite. We have constructed a composite spectrum from luminous blue QSOs at 1<z<2.1 selected from the Sloan Digital Sky Survey (SDSS). The observations with X-Shooter simultaneously cover ultraviolet (UV) to near-infrared (NIR) light, which ensures that the composite spectrum covers the full rest-frame range from Lyβ to 11350Å without any significant host contamination. Assuming a power-law continuum for the composite we find a spectral slope of αλ=1.70 ±0.01, which is steeper than previously found in the literature. We attribute the differences to our broader spectral wavelength coverage, which allows us to effectively avoid fitting any regions that are affected either by strong QSO emissions lines (e.g., Balmer lines and complex [Fe II] blends) or by intrinsic host galaxy emission. Finally, we demonstrate the application of the QSO composite spectrum for evaluating the reddening in other QSOs.

Abstract Copyright:

Journal keyword(s): quasars: general - galaxies: ISM - methods: data analysis - techniques: spectroscopic

VizieR on-line data: <Available at CDS (J/A+A/585/A87): spectrum.dat>

Status at CDS:  

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 9279 1
2 [VV2000] J082045.4+130618 QSO 08 20 45.3869699577 +13 06 18.958549640   15.7       ~ 15 0
3 4C -00.47 QSO 11 50 43.8708922658 -00 23 54.203269861   17.51 17.38 17.1   ~ 336 1
4 [VV2006] J121940.3-010007 QSO 12 19 40.3723381824 -01 00 07.464959386   17.12 16.92     ~ 19 0
5 [VV2006] J123602.4-033130 QSO 12 36 02.3396549831 -03 31 29.913898322   17.32 17.16     ~ 20 0
6 [VV2000] J135425.2-001359 QSO 13 54 25.2335588156 -00 13 57.985921597   16.98 16.77     ~ 28 1
7 QSO J1431+0535 QSO 14 31 48.0918688712 +05 35 58.038891826   17.35 17.13     ~ 19 0
8 LBQS 1435-0134 QSO 14 37 48.2856366322 -01 47 10.817420126   16.11 15.78 16.39   ~ 65 0

    Equat.    Gal    SGal    Ecl

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2020.03.30-10:24:22

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