J/A+A/681/A69 TANAMI III. First-epoch S band images (Benke+, 2024)
TANAMI: Tracking active galactic nuclei with austral milliarcsecond
interferometry. III. First-epoch S band images.
Benke P., Roesch F., Ros E., Kadler M., Ojha R., Edwards P.G., Horiuchi S.,
Hyland L.J., Phillips C., Quick J.F.H., Stevens J., Tzioumis A.K., Weston S.
<Astron. Astrophys. 681, A69 (2024)>
=2024A&A...681A..69B 2024A&A...681A..69B (SIMBAD/NED BibCode)
ADC_Keywords: Radio sources ; Active gal. nuclei ; Gamma rays
Keywords: galaxies: active - galaxies: jets - galaxies: nuclei -
gamma rays: galaxies
Abstract:
With the emergence of very high energy astronomy (VHE; E>100GeV), new
open questions were presented to astronomers studying the
multi-wavelength emission from blazars. Answers to these open
questions, such as the Doppler crisis, and finding the location of the
high-energy activity have eluded us thus far. Recently,
quasi-simultaneous multi-wavelength monitoring programs have shown
considerable success in investigating blazar activity.
After the launch of the Fermi Gamma-ray Space Telescope in 2008, such
quasi-simultaneous observations across the electromagnetic spectrum
became possible. In addition, with very long baseline interferometry
(VLBI) observations we can resolve the central parsec region of active
galactic nuclei (AGN) and compare morphological changes to the
gamma-ray activity to study high-energy emitting blazars. To achieve
our goals, we need sensitive, long-term VLBI monitoring of a complete
sample of VHE detected AGN. We performed VLBI observations of
TeV-detected AGN and high likelihood neutrino associations as of
December of 2021 with the Long Baseline Array (LBA) and other southern
hemisphere radio telescopes at 2.3GHz.
In this paper we present first light TANAMI S-band images, focusing on
the TeV-detected sub-sample of the full TANAMI sample. Apart from
these very high energy-detected sources, we also show images of the
two flux density calibrators and two additional sources included in
the observations. We study the redshift, 0.1-100GeV photon flux and
S-band core brightness temperature distributions of the TeV-detected
objects, and find that flat spectrum radio quasars and low synchrotron
peaked sources on average show higher brightness temperatures than
high-synchrotron-peaked BL Lacs. Sources with bright GeV gamma-ray
emission also show higher brightness temperature values than gamma-low
sources.
Long-term monitoring programs are crucial to study the
multi-wavelength properties of active galactic nuclei. With the
successful detection of even the faintest sources with flux densities
below 50mJy, future work will entail kinematic analysis and spectral
studies both at 2.3 and 8.4GHz to investigate the connection between
the radio and gamma-ray activity of these objects.
Description:
The images presented here are the first results of the S-band TANAMI
monitoring.
The observations include all twenty-four TeV-detected active galactic
nuclei of the southern sky.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 91 28 Sources observed during the first three S band
epochs
tablea2.dat 69 4 Image properties of non-TeV sources and
calibrators observed during 2020-2021 in S band
tablea3.dat 148 24 Image properties of the TeV-detected AGN in
our observations
list.dat 179 28 List of fits images
fits/* . 28 Individual fits images
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See also:
J/A+A/627/A148 : TANAMI radio galaxies I (Angioni+, 2019)
J/A+A/610/A1 : TANAMI II. Additional sources (Mueller+, 2018)
Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Source Source name (HHMM-DDMM)
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 20 F5.2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 33 F5.2 arcsec DEs Declination (J2000)
35- 55 A21 --- AName Alternative name
59- 63 A5 --- Class Class (1)
66- 70 F5.3 --- z Redshift
73- 74 I2 --- r_z Redshift reference (2)
76- 77 I2 --- Xep ? X band first epoch reference (3)
80- 91 A12 --- Assoc Association
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Note (1): Class code as follows:
LBL = low frequency peaked blazar
IBL = intermediate frequency peaked blazar
HBL = high frequency peaked blazar
EHBL = extremely high frequency peaked blazar
RG = radio galaxy
FSRQ = flat spectrum radio quasar
CSO = compact symmetric object
U = unidentified
Note (2): References as follows:
1 = Jones et al. (2009MNRAS.399..683J 2009MNRAS.399..683J)
2 = Mao (2011NewA...16..503M 2011NewA...16..503M)
3 = Arsioli et al. (2015A&A...579A..34A 2015A&A...579A..34A)
4 = Craig & Fruscione (1997AJ....114.1356C 1997AJ....114.1356C)
5 = Lauer et al. (2014ApJ...797...82L 2014ApJ...797...82L)
6 = Thompson et al. (1990PASP..102.1235T 1990PASP..102.1235T)
7 = Neeleman et al. (2016ApJ...818..113N 2016ApJ...818..113N)
8 = Jackson et al. (2002A&A...386...97J 2002A&A...386...97J)
9 = Lavaux & Hudson (2011MNRAS.416.2840L 2011MNRAS.416.2840L)
10 = Truebenbach & Darling (2017ApJS..233....3T 2017ApJS..233....3T)
11 = Chang et al. (2019A&A...632A..77C 2019A&A...632A..77C)
12 = Goldoni et al. (2016A&A...586L...2G 2016A&A...586L...2G)
13 = Paturel et al. (2002LEDA.........0P 2002LEDA.........0P)
14 = Keeney et al. (2018ApJS..237...11K 2018ApJS..237...11K)
Note (3): X band first epoch references as follows:
15 = Ganguly et al. (2013MNRAS.435.1233G 2013MNRAS.435.1233G)
16 = Muller et al. (2018A&A...610A...1M 2018A&A...610A...1M)
17 = Ojha et al. (2010A&A...519A..45O 2010A&A...519A..45O)
18 = Muller et al. (2014A&A...569A.115M 2014A&A...569A.115M)
19 = Ojha et al. (2004AJ....127.1977O 2004AJ....127.1977O)
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Source Source name (HHMM-DDMM)
12- 13 A2 --- Mtype Morphology (1)
17- 26 A10 "date" Epoch Date
30- 34 F5.2 mas bmaj Beam major axis
38- 40 F3.1 mas bmin Beam minor axis
44- 45 I2 deg PA [] Beam position angle
49- 55 F7.1 mJy Stot Total flux density at 2.3GHz
59- 62 F4.1 mJy/beam sigma Rms noise of the image
66- 69 F4.1 mJy/beam Ibase Lowest contour
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Note (1): Morphology code as follows:
SS = single-sided jet morphology
DS = double-sided jet morphology
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Source Source name (HHMM-DDMM)
12- 13 A2 --- MType Morphology (1)
17- 26 A10 "date" Epoch Date
30- 33 F4.1 mas bmaj Beam major axis
37- 39 F3.1 mas bmin Beam minor axis
43- 44 I2 deg PA [] Beam position angle
48- 53 F6.1 mJy Stot Total flux density at 2.3GHz
59- 61 F3.1 mJy/beam sigma rms noise of the image
65- 68 F4.1 mJy/beam Ibase Lowest contour
72- 77 F6.1 mJy Score Flux density of the core at 2.3GHz
81- 85 F5.1 mJy e_Score Error of flux density of the core
89- 92 F4.1 mas Thetacore FWHM of the core
96- 99 F4.2 mas e_Thetacore Error on FWHM of the core
102-108 E7.2 K Tb Brightness temperature
112-118 E7.2 K e_Tb Error of brightness temperature
122-129 E8.3 ph/cm2/s S 0.1-100GeV photon flux (2)
133-140 E8.3 ph/cm2/s e_S Error of 0.1-100GeV photon flux (2)
144-148 F5.3 Crab STeV ? Very high energy flux in Crab units
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Note (1): Morphology code as follows:
C = core component only
SS = single-sided jet morphology
DS = double-sided jet morphology
Note (2): from Abdollahi et al. (2022ApJS..260...53A 2022ApJS..260...53A, Cat. IX/67)
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Source Source name (HHMM-DDMM)
10- 11 I2 h RAh Right ascension (J2000)
13- 14 I2 min RAm Right ascension (J2000)
16- 20 F5.2 s RAs Right ascension (J2000)
22 A1 --- DE- Declination sign (J2000)
23- 24 I2 deg DEd Declination (J2000)
26- 27 I2 arcmin DEm Declination (J2000)
29- 33 F5.2 arcsec DEs Declination (J2000)
35- 44 A10 "date" Obs.date Observation date
46- 71 A26 --- FileName Name of the fits file in subdirectory fits
73-179 A107 --- Title Title of the fits file
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Acknowledgements:
Petra Benke, pbenke(at)mpifr-bonn.mpg.de
References:
Angioni et al., Paper I 2019A&A...627A.148A 2019A&A...627A.148A, Cat. J/A+A/627/A148
Muller et al., Paper II 2018A&A...610A...1M 2018A&A...610A...1M, Cat. J/A+A/610/A1
(End) Patricia Vannier [CDS] 18-Oct-2023