2017A&A...603A...1B


C.D.S. - SIMBAD4 rel 1.7 - 2020.09.19CEST05:47:24

2017A&A...603A...1B - Astronomy and Astrophysics, volume 603A, 1-1 (2017/7-1)

Simultaneous detection and analysis of optical and ultraviolet broad emission lines in quasars at z ∼ 2.2.

BISOGNI S., DI SEREGO ALIGHIERI S., GOLDONI P., HO L.C., MARCONI A., PONTI G. and RISALITI G.

Abstract (from CDS):

We studied the spectra of six z∼2.2 quasars obtained with the X-shooter spectrograph at the Very Large Telescope. The redshift of these sources and the X-shooter's spectral coverage allow us to cover the rest of the spectral range ∼1200-7000Å for the simultaneous detection of optical and ultraviolet lines emitted by the broad-line region. Simultaneous measurements, avoiding issues related to quasars variability, help us understand the connection between the different broad-line region line profiles generally used as virial estimators of black hole masses in quasars. The goal of this work is to compare the different emission lines for each object to check on the reliability of Hα, MgII and CIV with respect to Hβ. Hα and MgII linewidths correlate well with Hβ, while CIV shows a poorer correlation, due to the presence of strong blueshifts and asymmetries in the profile. We compared our sample with the only other two whose spectra were taken with the same instrument and for all examined lines our results are in agreement with the ones obtained with X-shooter at z∼1.5-1.7. We finally evaluate CIII] as a possible substitute of CIV in the same spectral range and find that its behaviour is more coherent with those of the other lines: we believe that, when a high quality spectrum such as the ones we present is available and a proper modelization with the FeII and FeIII emissions is performed, it is more appropriate to use this line than that of CIV if not corrected for the contamination by non-virialized components.

Abstract Copyright: © ESO, 2017

Journal keyword(s): galaxies: active - galaxies: nuclei - galaxies: Seyfert - quasars: emission lines - quasars: general - quasars: general

VizieR on-line data: <Available at CDS (J/A+A/603/A1): table1.dat sp/*>

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 Mrk 1502 Sy1 00 53 34.9326560879 +12 41 35.927159668   14.41 14.03     ~ 1038 1
2 CD-32 5613 WD* 08 41 32.4293043356 -32 56 32.916852010   12.07 11.85 12.3   DA5.5 264 0
3 [VV2006] J093147.4+021204 QSO 09 31 47.3799061258 +02 12 04.331371781   19.30 19.03     ~ 19 0
4 [VV2006] J103326.0+012836 QSO 10 33 25.9280141535 +01 28 36.417659751   19.00 18.78     ~ 21 0
5 [VV2006] J105239.4-003707 QSO 10 52 39.3904821446 -00 37 07.256038380   18.64 18.45     ~ 28 0
6 UM 489 QSO 12 19 11.2299423969 -00 43 45.695011325   18.25 18.14     ~ 36 0
7 QSO B1228+077 QSO 12 31 20.5615478137 +07 25 52.640937700   17.58 17.59     ~ 59 0
8 LBQS 1239+0249 QSO 12 42 20.0830659041 +02 32 57.595148071   18.46 18.31     ~ 40 0

    Equat.    Gal    SGal    Ecl

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2020.09.19-05:47:24

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