J/A+A/603/A100 37 GHz observations of NLS1 galaxies (Lahteenmaki+, 2017)
37 GHz observations of narrow-line Seyfert 1 galaxies.
Lahteenmaki A., Jarvela E., Hovatta T., Tornikoski M., Harrison D.L.,
Lopez-Caniego M., Max-Moerbeck W., Mingaliev M., Pearson T.J.,
Ramakrishnan V., Readhead A.C.S., Reeves R.A., Richards J.L., Sotnikova Y.,
Tammi J.
<Astron. Astrophys. 603, A100 (2017)>
=2017A&A...603A.100L 2017A&A...603A.100L (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, radio ; Galaxies, Seyfert
Keywords: galaxies: active - galaxies: Seyfert
Abstract:
Observations performed at Metsahovi Radio Observatory at 37GHz are
presented for a sample of 78 radio-loud and radio-quiet narrow-line
Seyfert 1 (NLS1) galaxies, together with additional lower and higher
frequency radio data from RATAN-600, Owens Valley Radio Observatory,
and the Planck satellite. Most of the data have been gathered between
February 2012 and April 2015 but for some sources even longer light
curves exist. The detection rate at 37GHz is around 19%, which is
comparable to other populations of active galactic nuclei presumed to
be faint at radio frequencies, such as BL Lac objects. Variability and
spectral indices are determined for sources with enough detections.
Based on the radio data, many NLS1 galaxies show a blazar-like radio
spectra exhibiting significant variability. The spectra at a given
time are often inverted or convex. The source of the high-frequency
radio emission in NLS1 galaxies, detected at 37GHz, is most probably
a relativistic jet rather than star formation. Jets in NLS1 galaxies
are therefore expected to be a much more common phenomenon than
earlier assumed.
Description:
Multifrequency data of a sample of narrow-line Seyfert 1 galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 94 50 Metsahovi NLS1 sample 1: Basic data and
statistics of the 37 GHz observations
plus 5 studied sources
table7.dat 55 567 Multifrequency data of our sample
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See also:
J/AJ/124/3042 : Narrow-line Seyfert 1 galaxies from SDSS EDR (Williams+, 2002)
J/A+A/459/55 : Narrow-band imaging of 5 Seyfert-1 galaxies (Bennert+, 2006)
J/AJ/131/1948 : Narrow line Seyfert 1 galaxies in the FBQS (Whalen+, 2006)
J/AJ/132/321 : Morphology of narrow-line Seyfert 1 galaxies (Deo+, 2006)
J/ApJS/166/128 : Narrow line Seyfert 1 galaxies from SDSS-DR3 (Zhou+, 2006)
J/AJ/143/83 : Properties of a sample of Seyfert 1 galaxies (Xu+, 2012)
J/A+A/573/A76 : Multifrequency study of NL Seyfert 1 galaxies (Jarvela+, 2015)
J/A+A/575/A55 : Radio jet emission from GeV-emitting NLSy1 (Angelakis+, 2015)
J/A+A/588/A146 : The gNLS1 galaxy PKS 2004-447. VLBI images (Schulz+, 2016)
J/A+A/591/A88 : [OIII] of radio-emitting narrow-line Seyfert 1 (Berton+, 2016)
J/A+A/596/A95 : Spectral nuclear properties of NLS1 galaxies (Schmidt+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Source Source name
25- 29 F5.3 --- z Redshift
31- 32 I2 h RAh Right ascension (J2000)
34- 35 I2 min RAm Right ascension (J2000)
37- 41 F5.2 s RAs Right ascension (J2000)
43 A1 --- DE- Declination sign (J2000)
44- 45 I2 deg DEd Declination (J2000)
47- 48 I2 arcmin DEm Declination (J2000)
50- 54 F5.2 arcsec DEs Declination (J2000)
56- 57 I2 --- NDet ? Number of detections
58 A1 --- --- [/]
59- 61 I3 --- NObs ? Number of observations
64- 65 I2 % Det ? Detection percentage
67- 70 F4.2 Jy S37GHz ? Maximum 35GHz flux density
72- 76 F5.1 mJy S1.4GHz ? 1.4GHz flux density
78- 82 I5 --- RL ? Radio loudness from Jarvela et al.
(2015, Cat. J/A+A/573/A76)
84 A1 --- r_RL Reference for RL if not Jarvela et al.
(2015, Cat. J/A+A/573/A76) (1)
86- 88 F3.1 [Msun] logMBH ? Black hole mass from Foschini et al.
(2015A&A...575A..13F 2015A&A...575A..13F)
90 A1 --- r_logMBH Reference for logMBH if not Foschini et al.
(2015A&A...575A..13F 2015A&A...575A..13F) (1)
92- 94 I3 --- Nmeas ? Number of measurements in table7
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Note (1): References as follows:
1 = Foschini (2011, in Narrow-Line Seyfert 1 Galaxies and their Place in the
Universe, 24)
2 = Berton et al. (2015A&A...578A..28B 2015A&A...578A..28B)
3 = Jarvela et al. (2015, Cat. J/A+A/573/A76)
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Byte-by-byte Description of file: table7.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Source Source name
24 A1 --- Note [*] Note (1)
26- 30 F5.1 GHz Freq Frequency
32- 42 F11.6 yr Time Time of the observation
44- 47 F4.2 Jy Flux ?=- Flux density
49- 52 F4.2 Jy e_Flux ? Flux density error
54- 55 A2 --- n_Flux [nd] nd for non-detection
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Note (1): * means that the time of the observation, the flux density and its
error are averages of multiple observations.
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Acknowledgements:
Emilia Jarvela, emilia.jarvela(at)aalto.fi
Aalto University Metsahovi Radio Observatory
(End) Emilia Jarvela [Aalto Univ.], Patricia Vannier [CDS] 25-Apr-2017