J/MNRAS/498/1278 VLA NLS1s southern sample (Chen+, 2020)
Radio morphology of southern narrow-line Seyfert 1 galaxies with
Very Large Array observations.
Chen S., Jarvela E., Crepaldi L., Zhou M., Ciroi S., Berton M., Kharb P.,
Foschini L., Gu M., La Mura G., Vietri A.
<Mon. Not. R. Astron. Soc. 498, 1278-1297 (2020)>
=2020MNRAS.498.1278C 2020MNRAS.498.1278C (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, Seyfert ; Galaxies, radio ; Morphology
Keywords: galaxies: active - galaxies: jets - galaxies: nuclei -
galaxies: Seyfert - radio continuum: galaxies
Abstract:
We present the results of new radio observations carried out with the
Karl G. Jansky Very Large Array C-configuration at 5.5GHz for a
sample of southern narrow-line Seyfert 1 galaxies (NLS1s). This work
increases the number of known radio-detected NLS1s in the southern
hemisphere, and confirms that the radio emission of NLS1s is mainly
concentrated in a central region at kpc-scale and only a few sources
show diffuse emission. In radio-quiet NLS1s, the radio luminosity
tends to be higher in steep-spectrum sources and be lower in
flat-spectrum sources, which is opposite to radio-loud NLS1s. This may
be because the radio emission of steep NLS1s is dominated by
misaligned jets, AGN-driven outflows, or star formation superposing on
a compact core. Instead the radio emission of flat NLS1s may be
produced by a central core which has not yet developed radio jets and
outflows. We discover new NLS1s harboring kpc-scale radio jets and
confirm that a powerful jet does not require a large-mass black hole
to be generated. We also find sources dominated by star formation.
These NLS1s could be new candidates in investigating the radio
emission of different mechanisms.
Description:
The targets were selected from Chen et al. (2018, J/A+A/615/A167), who
presented a catalog of NLS1s in the southern hemisphere.
We observed 62 sources which are higher than the declination limit of
the VLA (-30°). The redshifts of these targets range from 0.01 to
0.44.
We were granted 55 hours observing time in C configuration centered at
5.5GHz with a bandwidth of 2GHz and an angular resolution of
3.5-arcsec for this NLS1 sample. These observations were carried out
between November 2018 and February 2019 with an exposure time of 30
minutes on each target, yielding an image sensitivity of 7Jy/beam.
Such a resolution and sensitivity enable us to see diffuse emission
that is missing in A-configuration and discover extended structure. We
reduced the data using the VLA calibration pipeline version 5.4.0 and
the Common Astronomy Software Applications (CASA) version 5.5.0. A
standard ux density calibrator, 3C 147 or 3C 286, was used for every
target. The measurement set is split into 16 spectral windows
(centered at 4.55, 4.68, 4.81, 4.94, 5.06, 5.19, 5.32, 5.45, 5.55,
5.68, 5.81, 5.94, 6.06, 6.19, 6.32, 6.45 GHz).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 117 49 The radio measurements at 5.5GHz of the
southern NLS1 sample
table2.dat 72 49 The radio and optical properties of the
southern NLS1 sample
table3.dat 64 21 The radio measurements of 21 NLS1s
detected at 1.4 GHz
--------------------------------------------------------------------------------
See also:
J/A+A/596/A95 : SNLS1 galaxies spectral nuclear properties (Schmidt, 2016)
J/A+A/603/A100 : 37GHz observations of NLS1 galaxies (Lahteenmaki+, 2017)
J/other/NewA/54.30 : NLS1s 2MASS and WISE photometry (Chen+, 2017)
J/A+A/614/L1 : NLS1 at 37GHz (Lahteenmaki+, 2018)
J/A+A/615/A13 : Narrow line Seyfert 1 galaxies spectra (Schmidt+, 2018)
J/A+A/615/A167 : Catalog of NLS1s galaxies in 6dFGS survey (Chen+, 2018)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Name (JHHMM+DDMM)
12- 13 I2 h RAh Right ascension (J2000)
15- 16 I2 min RAm Right ascension (J2000)
18- 22 F5.2 s RAs Right ascension (J2000)
24 A1 --- DE- Declination sign (J2000)
25- 26 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
31- 35 F5.2 arcsec DEs Declination (J2000)
37- 41 F5.3 --- z Redshift
43- 47 F5.2 kpc/arcsec Scale Scale
49 A1 --- l_Cmaj Limit flag on Cmaj
50- 54 F5.2 kpc Cmaj Core major axis
56 A1 --- l_Cmin Limit flag on Cmin
57- 61 F5.2 kpc Cmin Core minor axis
63- 65 I3 deg CPA ? Core position angle
67 A1 --- l_Sint Limit flag on Sint
68- 74 F7.1 uJy Sint Integrated flux density at 5.5GHz
76- 80 F5.1 uJy e_Sint Integrated flux density at 5.5GHz error
82- 88 F7.1 uJy/beam Sp Peak flux density at 5.5GHz
90- 94 F5.1 uJy/beam e_Sp Peak flux density at 5.5GHz error
96 A1 --- l_logLint Limit flag on logLint
97-101 F5.2 [10-7W] logLint Integrated luminosity at 5.5GHz
103-106 F4.2 [10-7W] e_logLint Integrated luminosity at 5.5GHz error
108-112 F5.2 [10-7W] logLp Peak luminosity at 5.5GHz
114-117 F4.2 [10-7W] e_logLp Peak luminosity at 5.5GHz error
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Name (JHHMM+DDMM)
12- 15 F4.1 --- R5.5 Radio loudness based on 5.5GHz flux
17- 20 F4.1 --- e_R5.5 Radio loudness based on 5.5GHz flux error
22- 23 A2 --- RL/RQ [RL RQ] Radio classification based
on 5.5GHz flux
25- 28 F4.2 --- fc Flux concentration
30- 33 F4.2 --- e_fc Flux concentration error
35 A1 --- C/D [CD] Concentration classification
37- 41 F5.2 --- alpha5-6 In-band spectral index between 5 and 6GHz
43- 46 F4.2 --- e_alpha5-6 In-band spectral index between 5 and 6GHz
error
47 A1 --- F/S [FS] Spectral classification based on
in-band spectral index
49- 55 F7.2 10-19W/m2/nm S4400A Flux density in optical B-band
(in 10-17erg/c/cm2/Å)
57- 62 F6.2 10-19W/m2/nm e_S4400A Flux density in optical B-band
(in 10-17erg/c/cm2/Å) error
64- 67 F4.2 [Msun] logMBH Black hole mass
69- 72 F4.2 [Msun] e_logMBH Black hole mass error
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Name Name (JHHMM+DDMM)
12- 16 A5 --- Inst Instrument
18- 21 F4.1 mJy S1.4 Flux density at 1.4GHz
23- 25 F3.1 mJy e_S1.4 Flux density at 1.4GHz error
27- 31 F5.2 [10-7W] logL1.4 Luminosity at 1.4GHz
33- 36 F4.2 [10-7W] e_logL1.4 Luminosity at 1.4GHz
38- 42 F5.2 --- R1.4 Radio loudness based on 1.4GHz flux
44- 48 F5.2 --- e_R1.4 Radio loudness based on 1.4GHz flux error
50- 51 A2 --- RL/RQ [RL RQ] Radio classification based on
1.4GHz flux
53- 57 F5.2 --- alpha1-5 Spectral index between 1.4 and 5.5GHz
59- 62 F4.2 --- e_alpha1-5 Spectral index between 1.4 and 5.5GHz error
64 A1 --- F/S [FS] Spectral classification based on
spectral index between 1.4 and 5.5GHz
--------------------------------------------------------------------------------
Acknowledgements:
Sina Chen, sina.chen.120(at)gmail.com
(End) Patricia Vannier [CDS] 01-Sep-2020