J/A+A/614/L1 NLS1 at 37GHz (Lahteenmaki+, 2018)
Radio jets and gamma-ray emission in radio-silent narrow-line Seyfert 1
galaxies.
Lahteenmaki A., Jarvela E., Ramakrishnan V., Tornikoski M., Tammi J.,
Vera R.J.C., Chamani W.
<Astron. Astrophys. 614, L1 (2018)>
=2018A&A...614L...1L 2018A&A...614L...1L (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, radio ; Galaxies, Seyfert
Keywords: galaxies: active - galaxies: Seyfert - gamma rays: galaxies
Abstract:
We have detected six narrow-line Seyfert 1 (NLS1) galaxies at 37GHz
that were previously classified as radio silent and two that were
classified as radio quiet. These detections reveal the presumption
that NLS1 galaxies labelled radio quiet or radio silent and hosted by
spiral galaxies are unable to launch jets to be incorrect. The
detections are a plausible indicator of the presence of a powerful,
most likely relativistic jet because this intensity of emission at
37GHz cannot be explained by, for example, radiation from supernova
remnants. Additionally, one of the detected NLS1 galaxies is a newly
discovered source of gamma rays and three others are candidates for
future detections.
Description:
37GHz 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 72 8 Basic data and statistics of 37GHz and
gamma-ray observations
nls1-37.dat 58 326 37 GHz data of our sample
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See also:
J/A+A/573/A76 : Multifrequency study of NL Seyfert 1 galaxies (Jarvela+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 24 A24 --- Name Source name (SDSS JHHMMSS.ss+DDMMSS.s)
26- 30 F5.3 --- z Redshift
32- 35 F4.2 Jy S37GHzave Average 37GHz flux
37 A1 --- l_Sgamma Upper limit flag on Sgamma
38- 42 F5.2 10-9ph/cm2/s Sgamma gamma-ray flux
44- 47 F4.2 10-9ph/cm2/s e_Sgamma ? rms uncertainty on Sgamma
49- 50 I2 --- TS ?=- Maximum-likelihood test statistic
on the gamma-ray emission detection
51 A1 --- n_TS [b] b for detection and candidates
53- 64 A12 --- LSE Large-scale environment
66- 69 F4.2 [Msun] logMBH Black hale mass (1)
71- 72 I2 --- RL ?=- Radio source loudness (2)
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Note (1): Black hole mass from Jarvela et al. (2015, Cat. J/A+A/573/A76) for the
radio-quiet sources or estimated as described in appendix C for the
radio-silent sources.
Note (2): Radio source loudness from Jarvela et al. (2015, Cat. J/A+A/573/A76).
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Byte-by-byte Description of file: nls1-37.dat
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Bytes Format Units Label Explanations
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1- 24 A24 --- Name Source name (SDSS JHHMMSS.ss+DDMMSS.s)
26- 29 F4.1 GHz Freq Frequency
31- 41 F11.6 yr Time Time of the observation in decimal years
43- 46 F4.2 Jy Flux ? Flux density (1)
48- 51 F4.2 Jy e_Flux ? Flux density error
52- 53 A2 --- n_Flux [nd] nd for non-detection
55- 58 F4.2 Jy lFlux ? Flux upper limit
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Note (1): no value means a non-detection.
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Acknowledgements:
Emilia Jarvela, emilia.jarvela(at)aalto.fi
Aalto University Metsahovi Radio Observatory
(End) Emilia Jarvela [AUMRO], Patricia Vannier [CDS] 28-May-2018