J/MNRAS/510/2495 OH megamaser sample (Sotnikova+, 2022)
Radio continuum properties of OH megamaser galaxies.
Sotnikova Y.V., Wu Z., Mufakharov T.V., Mikhailov A.G., Mingaliev M.G.,
Erkenov A.K., Semenova T.A., Bursov N.N., Udovitskiy R.Y., Stolyarov V.A.,
Tsybulev P.G., Chen Y.J., Zhang J.S., Shen Z., Jiang D.R.
<Mon. Not. R. Astron. Soc., 510, 2495-2508 (2022)>
=2022MNRAS.510.2495S 2022MNRAS.510.2495S (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, radio ; Galaxy catalogs ;
Infrared sources ; Radio continuum
Keywords: galaxies: active - quasars: general - galaxies: star formation -
infrared: galaxies - radio continuum: galaxies
Abstract:
We present a study of the radio continuum properties of two
luminous/ultraluminous infrared galaxy samples: the OH megamaser (OHM)
sample (74 objects) and the control sample (128 objects) without
detected maser emission. We carried out pilot observations for 140
objects with the radio telescope RATAN-600 at 1.2, 2.3, 4.7, 8.2,
11.2, and 22.3GHz in 2019-2021. The OHM sample has two times more
flat-spectrum sources (32 per cent) than the control sample. Steep
radio spectra prevail in both samples. The median spectral index at
4.7GHz α4.7=-0.59 for the OHM sample, and α4.7=-0.71
for the non-OHM galaxies. We confirm a tight correlation of the
far-infrared (FIR) and radio luminosities for the OHM sample. We found
correlations between isotropic OH line luminosity LOH and the
spectral index α4.7 (ρ=0.26, p-val.=0.04) and between
LOH and radio luminosity P1.4 (ρ=0.35, p-val.=0.005).
Reviewing subsamples of masers powered by active galactic nuclei
(AGNs) and star formation revealed insignificant differences for their
FIR and radio properties. None the less, AGN-powered galaxies exhibit
larger scatter in a range of parameters and their standard deviations.
The similarities in the radio and FIR properties in the two samples
are presumably caused by the presence of a significant amount of AGN
sources in both samples (47 and 30 per cent in the OHM and control
samples) and/or possibly by the presence of undetected OH emission
sources in the control sample.
Description:
We present flux densities for the OH megamasers and the control sample
of luminous/ultraluminous infrared galaxies without OH emission. For
the sources for which there is no detection at any RATAN frequency, we
provide upper flux density limits at 4.7GHz denoted by the symbol "<".
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 130 74 The OHM sample parameters
tablea2.dat 130 128 The control sample parameters
table3.dat 98 166 Flux densities for OHM galaxies sample
table4.dat 98 178 Flux densities for control sample
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tablea1.dat tablea2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- NVSS NVSS name (JHHMMSS+DDMMSS)
16- 17 I2 h RAh Right ascension (J2000)
19- 20 I2 min RAm Right ascension (J2000)
22- 26 F5.2 s RAs Right ascension (J2000)
28 A1 --- DE- Declination sign (J2000)
29- 30 I2 deg DEd Declination (J2000)
32- 33 I2 arcmin DEm Declination (J2000)
35- 38 F4.1 arcsec DEs Declination (J2000)
40- 45 F6.4 --- z Redshift
47- 52 F6.3 Jy S1.4 Flux density at 1.4GHz
54- 58 F5.3 Jy e_S1.4 Flux density at 1.4GHz error
60- 67 F8.2 10+23W/Hz P1.4 Radio luminosity at 1.4GHz
69- 76 F8.3 10+23W/Hz e_P1.4 Radio luminosity at 1.4GHz error
78- 82 F5.2 --- logR Radio loudness
84- 88 F5.3 --- E_logR Error on radio loudness (upper value)
90- 94 F5.3 --- e_logR Error on radio loudness (lower value)
96-100 F5.2 --- alpha1.4 Spectral index at 1.4GHz
102-105 F4.2 --- e_alpha1.4 Spectral index at 1.4GHz error
108-112 F5.2 --- alpha4.7 Spectral index at 4.7GHz
114-117 F4.2 --- e_alpha4.7 Spectral index at 4.7GHz error
120-130 A11 --- Type Type of radio spectrum
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3.dat table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- NVSS NVSS name (JHHMMSS+DDMMSS)
16- 22 I7 d JD Observing epoch (Julian date)
24- 25 I2 --- N Number of observations
27- 32 F6.3 Jy S22 ?=- Flux density at 22.3GHz
34- 38 F5.3 Jy e_S22 ?=- Uncertainty of flux density at 22.3GHz
39- 44 F6.3 Jy S11 ?=- Flux density at 11.2GHz
46- 50 F5.3 Jy e_S11 ?=- Uncertainty of flux density at 11.2GHz
51- 56 F6.3 Jy S8 ?=- Flux density at 8.2GHz
58- 62 F5.3 Jy e_S8 ?=- Uncertainty of flux density at 8.2GHz
64 A1 --- l_S4 Upper limit flag on S4
65- 70 F6.3 Jy S4 ?=- Flux density at 4.7GHz
72- 76 F5.3 Jy e_S4 ?=- Uncertainty of flux density at 4.7GHz
77- 82 F6.3 Jy S2 ?=- Flux density at 2.3GHz
84- 88 F5.3 Jy e_S2 ?=- Uncertainty of flux density at 2.3GHz
89- 93 F5.2 Jy S1 ?=- Flux density at 1.0GHz
95- 98 F4.2 Jy e_S1 ?=- Uncertainty of flux density at 1.0GHz
--------------------------------------------------------------------------------
Acknowledgements:
Yu. Sotnikova, lacerta999(at)gmail.com
(End) Patricia Vannier [CDS] 10-Mar-2023