J/ApJ/899/141 VLBA observations of the AGN TXS 0128+554 (Lister+, 2020)
TXS 0128+554: A Young Gamma-Ray-emitting Active Galactic Nucleus with Episodic
Jet Activity.
Lister M.L., Homan D.C., Kovalev Y.Y., Mandal S., Pushkarev A.B.,
Siemiginowska A.
<Astrophys. J., 899, 141 (2020)>
=2020ApJ...899..141L 2020ApJ...899..141L
ADC_Keywords: BL Lac objects; Active gal. nuclei; Photometry, millimetric/submm;
Positional data
Keywords: X-ray active galactic nuclei ; Radio jets ; Active galactic nuclei ;
Jets ; Relativistic jets ; Gamma-ray astronomy ; Radio galaxies ;
Radio lobes ; Extragalactic radio sources ;
Very long baseline interferometry
Abstract:
We have carried out a Chandra X-ray and multifrequency radio Very Long
Baseline Array study of the active galactic nucleus (AGN) TXS0128+554,
which is associated with the Fermi γ-ray source
4FGLJ0131.2+5547. The AGN is unresolved in a target 19.3ks Chandra
image, and its spectrum is well fit by a simple absorbed power-law
model, with no distinguishable spectral features. Its relatively soft
X-ray spectrum compared to other compact symmetric objects (CSOs) may
be indicative of a thermal emission component, for which we were able
to obtain an upper temperature limit of kT=0.08keV. The compact radio
morphology and measured advance speed of 0.32c±0.07c indicate a
kinematic age of only 82yr±17yr, placing TXS0128+554 among the
youngest members of the CSO class. The lack of compact, inverted
spectrum hotspots and an emission gap between the bright inner jet and
outer radio lobe structure indicate that the jets have undergone
episodic activity, and were relaunched a decade ago. The predicted
γ-ray emission from the lobes, based on an inverse
Compton-emitting cocoon model, is three orders of magnitude below the
observed Fermi-LAT flux. A comparison to other Fermi-detected and
non-Fermi-detected CSOs with redshift z<0.1 indicates that the
γ-ray emission likely originates in the inner jet/core region,
and that nearby, recently launched AGN jets are primary candidates for
detection by the Fermi-LAT instrument.
Description:
We observed TXS 0128+554 over a 13hr period on 2018 June 29 (obscode
BL251) with the Very Long Baseline Array (VLBA). During each of the
target and calibrator pointings, scans were made successively at
central observing frequencies of 2.3, 5.0, 6.6, 8.4, 15.4, 22.2GHz.
The data were recorded at 2048Mbps in dual circular polarization, with
a bandwidth of 256MHz at each frequency.
Objects:
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RA (2000) DE Designation(s)
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01 31 13.82 +55 45 13.0 TXS 0128+554 = 2MASS J01311382+5545128
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 41 76 Fitted 15GHz jet features
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See also:
VIII/10 : Bell Laboratories H I Profiles (Stark+ 1992)
VIII/28 : Bell Laboratories H I Survey (Stark+ 1992)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
J/ApJS/79/77 : Bell Lab. H I Survey - High Velocity Clouds (Stark+ 1992)
J/A+AS/122/235 : ROSAT active galaxies identif. (Laurent-Muehleisen+,1997)
J/ApJ/560/675 : Chandra X-ray point sources in Cen A (Kraft+, 2001)
J/A+A/435/521 : Radio Sources in Low-Luminosity AGNs. IV (Nagar+, 2005)
J/A+A/450/959 : VLBA images of High Frequency Peakers (Orienti+, 2006)
J/AJ/133/1236 : Fifth VLBA calibrator survey: VCS5 (Kovalev+, 2007)
J/AJ/136/580 : Sixth VLBA calibrator survey: VCS6 (Petrov+, 2008)
J/A+A/482/483 : GHz-peaked spectrum (GPS) sources (Torniainen+, 2008)
J/ApJ/707/L56 : VLBI and bright Fermi/LAT sources (Kovalev, 2009)
J/AJ/137/3718 : 15GHz monitoring of AGN jets with VLBA (Lister+, 2009)
J/AJ/138/1874 : MOJAVE. VI. Kinematic analysis of blazar jets (Lister+, 2009)
J/ApJ/742/27 : 15GHz and jet properties of MOJAVE blazars (Lister+, 2011)
J/ApJS/194/29 : Observations of blazars at 15GHz (Richards+, 2011)
J/ApJS/199/26 : The 2MASS Redshift Survey (2MRS) (Huchra+, 2012)
J/A+A/545/A113 : MOJAVE IX. Core shift effects (Pushkarev+, 2012)
J/ApJ/787/151 : Fitted jet components in BL Lacertae (Cohen+, 2014)
J/AJ/147/143 : MOJAVE. XI. Spectral distributions (Hovatta+, 2014)
J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)
J/ApJ/810/14 : Third catalog of LAT-detected AGNs (3LAC) (Ackermann+, 2015)
J/ApJS/232/18 : The third Fermi-LAT >10GeV catalog (3FHL) (Ajello+, 2017)
J/A+A/598/A78 : The GMRT 150MHz all-sky radio survey (Intema+, 2017)
J/ApJS/234/12 : MOJAVE XV. VLBA 15GHz obs. AGN jets 1996-2016 (Lister+, 2018)
J/A+A/614/A42 : PKS B1718-649 ALMA observations (Maccagni+, 2018)
J/A+A/627/A148 : TANAMI radio galaxies I (Angioni+, 2019)
J/ApJ/874/43 : MOJAVE. XVII. Parsec-scale jet kinematics AGNs (Lister+, 2019)
J/MNRAS/485/1822 : AGN core shift measurements (Plavin+, 2019)
J/ApJS/247/33 : The Fermi LAT fourth source catalog (4FGL) (Abdollahi+, 2020)
J/ApJ/892/105 : 4th catalog of Fermi LAT-detected AGNs (4LAC) (Ajello+, 2020)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- ID Feature identification number (1)
5- 8 I4 yr Obs.Y [2016/2019] Year of the observation
10- 12 A3 "month" Obs.M Month of the observation
14- 15 I2 d Obs.D Day of the observation
17- 20 F4.1 mJy F15 [1.0/63.3] The 15GHz flux density
22- 25 F4.2 mas r [0.02/8.5]? Position offset from core feature (2)
27- 31 F5.1 deg PA [69.5/288.7]? Position angle with respect of core
feature (2)
33- 36 F4.2 mas MajAxis [0.09/3.42]? FWHM major axis of fitted Gaussian
38- 41 F4.1 [K] Tb [6.6/10.4]? log brightness temperature
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Note (1): Zero indicates core feature.
Note (2): Or map center for the core feature entries.
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History:
From electronic version of the journal
(End) Prepared by [AA], Coralie Fix [CDS], 21-Oct-2021