2022ApJ...938..152D

Query : 2022ApJ...938..152D

2022ApJ...938..152D - Astrophys. J., 938, 152 (2022/October-3)

Low-frequency Radio Continuum Imaging and SED Modeling of 11 LIRGs: Radio-only and FUV to Radio Bands.

DEY S., GOYAL A., MALEK K., GALVIN T.J., SEYMOUR N., DIAZ SANTOS T., PIOTROWSKA J. and CHARMANDARIS V.

Abstract (from CDS):

We present a detailed analysis of 11 local luminous infrared galaxies from ultraviolet through far-infrared to radio (∼70 MHz to ∼15 GHz) bands. We derive the astrophysical properties through spectral energy distribution (SED) modeling using the Code Investigating GALaxy Emission (CIGALE) and UltraNest codes. The radio SEDs include our new observations at 325 and 610 MHz from the GMRT and the measurements from public archives. Our main results are (1) radio SEDs show turnovers and bends, (2) the synchrotron spectral index of the fitted radio spectra ranges between -0.5 and -1.7, and (3) the infrared luminosity, dust mass, dust temperature, stellar mass, star formation rates (SFRs), and active galactic nuclei (AGN) fraction obtained from CIGALE fall within the range exhibited by galaxies of the same class. The ratio of 60 μm infrared and 1.4 GHz radio luminosity, the 1.4 GHz thermal fraction, and emission measure range between 2.1 and 2.9, 0.1% and 10%, 0.02 and 269.5 × 106 cm–6 pc, respectively. We conclude that the turnovers seen in the radio SEDs are due to free-free absorption; this is supported by the low AGN fraction derived from the CIGALE analysis. The decomposed 1.4 GHz thermal and nonthermal radio luminosities allowed us to compute the SFR using scaling relations. A positive correlation is observed between the SFRIR obtained 10 Myr ago (compared to 100 Myr ago) and 1.4 GHz radio (total and nonthermal) because similar synchrotron lifetimes are expected for typical magnetic field strengths observed in these galaxies (≈50 μG).

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Radio continuum emission - Luminous infrared galaxies - Spectral energy distribution - Interstellar medium - Galaxy photometry

Simbad objects: 18

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Number of rows : 18
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 ICRF J054236.1+495107 Sy1 05 42 36.13789710 +49 51 07.2337139   18.45 17.80 17.210   ~ 1573 1
2 MCG-04-25-006 Sy2 10 24 31.4324894928 -23 33 10.567872576   14.45 14.21 12.89   ~ 82 1
3 NGC 3508 Sy1 11 02 59.6529633144 -16 17 21.667120980   13.6   12.67 13.0 ~ 58 1
4 QSO J1130-1449 Bla 11 30 07.0523452128 -14 49 27.388021944   17.17 16.90 16 16.97 ~ 739 1
5 ESO 440-58 IG 12 06 51.8 -31 56 47   15.44   14.89   ~ 64 0
6 QSO B1245-197 QSO 12 48 23.89808243 -19 59 18.5899475   21.52 20.5     ~ 145 1
7 MCG-04-31-023 Sy1 13 02 52.3177169808 -23 55 17.932558692   14.77 14.78 13.24 13.59 ~ 131 1
8 NGC 5135 Sy2 13 25 44.059 -29 50 01.24   12.58 13.35 11.53 12.2 ~ 500 1
9 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
10 IC 4280 Sy1 13 32 53.390 -24 12 25.83   13.48   12.17 15.22 ~ 86 1
11 NGC 6000 Sy2 15 49 49.556 -29 23 12.50   13.02   11.27 12.0 ~ 116 1
12 IRAS 16164-0746 Sy1 16 19 11.792 -07 54 02.61   15.49       ~ 88 1
13 QSO J1626-2951 Bla 16 26 06.02084013 -29 51 26.9712990   18.41 20.5 17.6   ~ 452 1
14 ESO 453-5 EmG 16 47 31.0738092240 -29 21 21.125984148   16.8       ~ 52 1
15 PKS 1827-36 rG 18 30 58.9044114912 -36 02 30.801933924           ~ 85 1
16 LEDA 84885 Sy1 18 32 41.177 -34 11 27.46   15.63   13.66   ~ 142 1
17 ESO 593-8 rG 19 14 31.09656 -21 19 08.7564   14.70   13.70   ~ 88 2
18 3C 468.1 rG 23 50 54.845 +64 40 19.59           ~ 73 1

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