J/A+A/691/A15 High-redshift quasars spectra (Deconto-Machado+, 2024)
Exploring the links between quasar winds and radio emission along the
main sequence at high redshift.
Deconto-Machado A., del Olmo A., Marziani P.
<Astron. Astrophys. 691, A15 (2024)>
=2024A&A...691A..15D 2024A&A...691A..15D (SIMBAD/NED BibCode)
ADC_Keywords: QSOs ; Redshifts ; Radio sources ; Spectra, infrared
Keywords: quasar: emission lines - quasars: general -
quasars: supermassive black holes
Abstract:
Despite the increasing prevalence of radio-loud (RL) sources at cosmic
noon, our understanding of the underlying physics that governs the
accretion disc outflows in these particular sources and its
dissimilarity with radio-quiet (RQ) quasars remains somewhat limited.
Disentangling the real impact of the radio-loudness and accretion on
the outflow parameters remains a challenge to this day.We present 10
new spectra of high-redshift and high-luminosity quasars and combine
it with previous data at both high and low redshift with the aim to
evaluate the role of the feedback from RL and RQ AGN. The final
high-redshift (1.5≲z≲3.9) high-luminosity (47.1≤log(L)≤48.5)
sample consists of a combination of 60 quasars from our ISAAC and the
Hamburg-ESO surveys. The low-redshift (z≤0.8) sample has 84 quasars
with optical and Faint Object Spectrograph (FOS) reanalyzed data.
We perform a multicomponent analysis of optical and UV emission line
profiles along the quasar main sequence, and provide a relation to
estimate the outflow main parameters (mass rate, thrust and kinetic
power) in both the BLR and NLR through the analysis of the
[OIII]λ5007 and CIVλ1549 emission lines.
Spectrophotometric properties and line profile measurements are
presented for Hβ+[OIII]λλ4959,5007,
SiIVλ1397+OIV]λ1402, CIVλ1549+HeIIλ1640,
and the 1900Å blend. High-ionization lines as such CIVλ1549
and [OIII]λ5007 usually present a significant asymmetry towards
the blue especially in radio-quiet sources that is strong evidence of
outflow motions. In the ISAAC sample, 72% of the quasars where [OIII]
is clearly detected present significant outflows, with centroid
velocity at half intensity blueshifted to values greater than
∼250km/s. Radio-loud quasars tend to present slightly more modest
blueshifted components in both the UV and optical ranges. The behavior
of [OIII]λ5007 mirrors the one of CIVλ1549, with
blueshift amplitudes between the two lines showing a high degree of
correlation that appears unaffected by the presence of radio emission.
In contrast to low redshift, both RL and RQ AGN outflow parameters at
high luminosity appear in the range needed to provide feedback effects
on their host galaxies. Both high- and low-z RL quasars exhibit
smaller outflows compared to RQ, suggesting a potential role of
radioloudness in mitigating outflow effects. Nevertheless, the
radio-loudness effect on the AGN feedback is much less significant
than the one of accretion that emerges as the main driver of the
nuclear outflows.
Description:
The radio properties of the HEMS and FOS sample are listed in Table
B.1 together with the UV and optical full profile measured parameters
for this sample and used in this paper.
We present an additional sample of 10 high-redshift, highluminosity
quasars observed with the VLT/ISAAC spectrograph that complete our
ISAAC sample, discussed in Paper I (Deconto-Machado et al.,
2023A&A...669A..83D 2023A&A...669A..83D, Cat. J/A+A/669/A83).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 112 10 Source identification
sp/* . 10 Individual spectra
table2.dat 123 112 Identification of the sources, radio properties, and
results of the UV and optical parameters obtained
through the re-analysis by multi-component fitting
and used in this study for both the
HEMS and FOS samples
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See also:
J/A+A/669/A83 : High-redshift quasars spectra (Deconto-Machado+, 2023)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name QSO name
17- 18 I2 h RAh Simbad right ascension (J2000)
20- 21 I2 min RAm Simbad right ascension (J2000)
23- 27 F5.2 s RAs Simbad right ascension (J2000)
29 A1 --- DE- Simbad declination sign (J2000)
30- 31 I2 deg DEd Simbad declination (J2000)
33- 34 I2 arcmin DEm Simbad declination (J2000)
36- 40 F5.2 arcsec DEs Simbad declination (J2000)
42- 47 F6.4 --- z Redshift
49- 54 F6.4 --- e_z Redshift error
56- 60 F5.2 mag Hmag 2MASS H magnitude
62- 67 F6.2 mag iMAG Absolute i magnitude
69- 86 A18 --- FileName Name of the spectrum file in subdirectory sp
88-112 A25 --- SName Simbad name
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 10 F10.4 0.1nm lambda Wavelength in Angstroems
12- 22 E11.5 10mW/m2/nm Flux Rest-frame specific flux
(in units of erg/s/cm2/Å)
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- Sample [HEMS FOS] Sample
6- 29 A24 --- Source Source identification
31- 32 I2 h RAh Right ascension (J2000)
34- 35 I2 min RAm Right ascension (J2000)
37- 40 F4.1 s RAs Right ascension (J2000)
42 A1 --- DE- Declination sign (J2000)
43- 44 I2 deg DEd Declination (J2000)
46- 47 I2 arcmin DEm Declination (J2000)
49- 50 I2 arcsec DEs Declination (J2000)
52- 56 F5.3 --- z Redshift
58 A1 --- l_P1.4GHz Limit flag on P1.4GHz
59- 66 F8.5 10+26W/Hz P1.4GHz Radio power at 1.4GHz
68 A1 --- l_logRk Limit flag on logRk
69- 73 F5.2 --- logRk Radioloudness parameter
75- 76 A2 --- RClass Radio classification
78- 82 I5 km/s c1/4[OIII] ?=- Velocity centroid at 1/4 intensity
of the [OIII] full profile
84- 86 I3 km/s e_c1/4[OIII] ? Velocity centroid at 1/4 intensity
of the [OIII] full profile error
87- 88 A2 --- n_c1/4[OIII] [* ] Note on c1/4[OIII] (1)
90- 94 I5 km/s c1/2[OIII] ?=- Velocity centroid at 1/2 intensity
of the [OIII] full profile
96- 98 I3 km/s e_c1/2[OIII] ? Velocity centroid at 1/2 intensity
of the [OIII] full profile error
99-100 A2 --- n_c1/2[OIII] [* ] Note on c1/2[OIII] (1)
102-106 I5 km/s c1/4CIV ?=- Velocity centroid at 1/4 intensity
of the CIV full profile
108-111 I4 km/s e_c1/4CIV ? Velocity centroid at 1/4 intensity
of the CIV full profile error
112 A1 --- n_c1/4CIV [d] Note on c1/4CIV (1)
114-118 I5 km/s c1/2CIV Velocity centroid at 1/2 intensity
of the CIV full profile
120-122 I3 km/s e_c1/2CIV Velocity centroid at 1/2 intensity
of the CIV full profile error
123 A1 --- n_c1/2CIV [d] Note on c1/2CIV (1)
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Note (1): Notes as follows:
** = [OIII] emission strongly affected by atmospheric lines
d = CIV emission strongly affected by absorptions
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Acknowledgements:
Alice Deconto-Machado, alicedeconto(at)gmail.com
References:
Deconto-Machado et al., Paper I 2023A&A...669A..83D 2023A&A...669A..83D, Cat. J/A+A/669/A83
(End) Patricia Vannier [CDS] 19-Aug-2024