J/A+A/697/A176 Accretion and Jet for LERGs (Ye+, 2025)
Accretion properties and jet mechanisms for the low-excitation radio
galaxies.
Ye X.-H., Baldi R.D., Chen Y.-Y., Bastieri D., Fan J.-H.
<Astron. Astrophys. 697, A176 (2025)>
=2025A&A...697A.176Y 2025A&A...697A.176Y (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Radio sources ; Redshifts ; Stars, masses
Keywords: accretion, accretion disks - galaxies: active -
BL Lacertae objects: general - galaxies: jets
Abstract:
Radio galaxies (RGs) are a subclass of active galactic nuclei, which
are suggested to be the parent populations of blazars. According to
the accretion-ejection paradigm, RGs can be classified into
low-excitation or high-excitation radio galaxies (LERGs or HERGs). In
this paper, we compiled a distance-limited (z<0.15) sample of 431
LERGs (Fanaroff-Riley, or FR, type 0, I, and II RGs) to discuss their
jet formation mechanism with the ADAF (advection-dominated accretion
flow) scenario, and compare their accretion properties with Fermi BL
Lacertae objects. We explored different jet mechanisms
(Blandford-Znajek [BZ] model and a mixture of the BZ and Blandford-
Payne, hybrid, model) within the framework of ADAF-type disc around a
Kerr black hole for both LERGs and Fermi BL Lacs. Based on standard
assumptions on the accretion-ejection coupling in RGs, the maximum
kinetic jet and accretion power for FR 0s, FR Is, FR IIs can be,
explained by an ADAF with the pure BZ mechanism or hybrid jet
mechanism. In addition, for one third of the FR IIs, to account for
their higher kinetic jet power than what is simply expected by the
hybrid jet mechanism, the magnetic field could play an important role
as in the form of magnetization-driven outflows or stronger magnetic
structures, as observed in some BL Lacs with high jet powers.
Similarities between BL Lacs and LERGs (e.g., accretion-ejection and
clustering properties) suggest that high synchrotron peaked BL Lacs
could be the beamed counterparts of FR 0s, and a potential general
unification between LERGs and BL Lacs populations is discussed.
However, a complete sample of BL Lacs is needed to robustly compare
the jet and accretion properties with those of LERGs in the future.
Description:
In this paper, a sample for nearby 431 low-excitation radio galaxies
and 75 Fermi BL Lacertae objects with available redshifts, 1.4GHz
NVSS radio emissions, bolometric emissions, jet powers, and BH masses
are complied.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 61 506 Summary of 431 LERGs and 75 BL Lacs
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See also:
J/A+A/598/A49 : FRICAT. FIRST catalog of FR I radio galaxies (Capetti+, 2017)
J/A+A/601/A81 : FRIICAT. FIRST catalog of FR II radio galaxies (Capetti+, 2017)
J/A+A/609/A1 : FR0CAT. a FIRST catalog of FR 0 radio galaxies (Baldi+, 2018)
J/ApJS/253/46 : Optical spectroscopy of Fermi blazars (Paliya+, 2021)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 19 A19 --- Name Source name
21- 25 A5 --- Class Classification
27- 31 F5.3 --- z Redshift
33- 37 F5.2 [10-7W] logL1.4GHz ? Logarithm of 1.4GHz radio luminosity
39- 43 F5.2 [10-7W] logLkin ? Logarithm of kinetic jet power
45- 49 F5.2 [10-7W] logLline ? Logarithm of total line luminosity
51- 55 F5.2 [Msun] logMBH Logarithm of the black hole mass
57- 61 F5.2 [-] lambda ? Logarithm of the line accretion rate
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Acknowledgements:
Xu-Hong Ye, xuhong.ye(at)studenti.unipd.it
(End) Patricia Vannier [CDS] 28-Mar-2025