J/ApJ/861/97 Jet power of blazars from the TGSS at 150MHz (Fan+, 2018)
Constraints on the composition, magnetization, and radiative efficiency in the
jets of blazars.
Fan X.-L., Wu Q., Liao N.-H.
<Astrophys. J., 861, 97 (2018)>
=2018ApJ...861...97F 2018ApJ...861...97F
ADC_Keywords: Active gal. nuclei; QSOs; Radio sources; Redshifts
Keywords: galaxies: jets ; quasars: general
Abstract:
The composition and energy dissipation in jets are two of the
fundamental questions of jet physics that are not fully understood. In
this paper, we attempt to constrain the composition, magnetization,
and radiative efficiency for blazars with the recently released
low-frequency radio catalog of the TIFR GMRT Sky Survey at 150MHz. The
jet power estimated from the low-frequency radio emission is much
lower than that derived from spectral energy distribution fitting
assuming one proton per electron. Assuming the jet power estimated
from low-frequency radio emission is physical, the fraction of
electron/positron pairs can be constrained with npairs/np∼10. By
comparing the power carried by the magnetic field and radiation with
the jet power estimated from the low-frequency radio emission, we find
both the relatively high magnetization parameter of σ∼0.5 and
the radiative efficiency of η∼0.4 in the dissipation region of
blazars. These results suggest that magnetic reconnection processes
may play an important role in the energy dissipation of blazars. We
also explore the connection between these three parameters
(npairs/np, σ, and η) and the black hole mass, disk
luminosity, and Eddington ratio. No significant correlation is found,
except that σ shows a possible correlation with disk luminosity.
Description:
We cross-match the TIFR GMRT Sky Survey (TGSS) ADR1 catalog
(Intema+ 2017, J/A+A/598/A78) with the sample of
Ghisellini+ (2014, J/other/Nat/515.376) within a distance of 3". This
results in a sample of 133 objects. We estimate their jet power with
the 150MHz radio flux from TGSS ADR1 and the Pkin-L151 relation in
Godfrey & Shabala (2013ApJ...767...12G 2013ApJ...767...12G).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 146 79 The source information
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See also:
VIII/100 : GaLactic and Extragalactic All-sky MWA survey (Hurley-Walker+, 2016)
J/ApJ/658/815 : Radio loudness of active galactic nuclei (Sikora+, 2007)
J/ApJ/686/859 : Radio sources at 0.327, 1.4, 4.5, 8.5GHz (Birzan+, 2008)
J/ApJS/194/45 : QSO properties from SDSS-DR7 (Shen+, 2011)
J/other/Sci/338.1445 : Relativistic jets from BH systems (Nemmen+, 2012)
J/ApJ/765/62 : SDSS-DR7 opt. sp. analysis of radio gal. (Sikora+, 2013)
J/other/Nat/515.376 : Relativistic jet power in blazars (Ghisellini+, 2014)
J/MNRAS/448/1060 : Fermi/LAT broad emission line blazars (Ghisellini+, 2015)
J/A+A/598/A78 : The GMRT 150MHz all-sky radio survey (Intema+, 2017)
J/MNRAS/467/4565 : Bimodal radio variability in OVRO blazars (Liodakis+, 2017)
J/A+A/598/A104 : LOFAR Two-metre Sky Survey (Shimwell+, 2017)
J/ApJS/235/39 : Jet properties of γ-ray-loud 3FGL AGNs (Chen, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Name Identifier (HHMM+DDMM, J2000) (1)
12- 20 F9.5 h RAh Hour of Right Ascension (J2000)
23- 31 F9.5 deg DEdeg Degree of Declination (J2000)
34- 39 F6.3 --- z [0.4/3.1] Redshift (1)
42- 46 F5.2 [Msun] logMBH [6.5/10] log black hole mass (1)
49- 53 F5.2 [10-7W] logLb [43.8/47.2] log disk luminosity
in erg/s (1)
56- 61 F6.2 [-] logLb/LE [-1.8/0.4] log Eddington ratio (1)
64- 73 F10.2 mJy F150 [34.5/15324.4] 150MHz radio flux density
derived from TGSS
76- 80 F5.2 [10-7W/Hz/sr] logL150 [31.7/35.2] log of 150MHz radio
luminosity derived from TGSS
in units of erg/s/Hz/sr
83- 87 F5.2 [10-7W] logPkin [44.2/46.6] log kinetic jet power
estimated by Equation 2 (2)
90- 94 F5.2 [10-7W] logPB [43.5/46.1] log magnetic jet power (3)
97-101 F5.2 [10-7W] logPe [43.1/45.9] log electronic jet power (3)
104-108 F5.2 [10-7W] logPp [44.7/48.2] log protonic jet power (3)
111-115 F5.2 [10-7W] logPfit [44.8/48.2] log total jet power from SED
fitting in erg/s
118-122 F5.2 [10-7W] logPrad [43.7/47.3] log radiative jet power
in erg/s
125-130 F6.2 [-] logne/np [-0.6/4.4] log electron/positron pair
fraction
133-138 F6.2 [-] logsigma [-1.6/0.9] log magnetization parameter
141-146 F6.2 [-] logeta [-1.3/-0.03] log radiative efficiency
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Note (1): From Ghisellini+ (2014, J/other/Nat/515.376).
Note (2): Equation 2: Pkin=3x1044(L151/1025W/Hz/sr)0.67erg/s
Note (3): The jet power carried by the magnetic field, electrons, and protons,
respectively, which are derived from Ghisellini+ (2014, J/other/Nat/515.376)
in erg/s.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-Jul-2019