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J/ApJ/836/185  SEDs of the radio continuum from KINGFISHER  (Tabatabaei+, 2017)

The radio spectral energy distribution and star-formation rate calibration in galaxies. Tabatabaei F.S., Schinnerer E., Krause M., Dumas G., Meidt S., Damas-Segovia A., Beck R., Murphy E.J., Mulcahy D.D., Groves B., Bolatto A., Dale D., Galametz M., Sandstrom K., Boquien M., Calzetti D., Kennicutt R.C., Hunt L.K., De Looze I., Pellegrini E.W. <Astrophys. J., 836, 185-185 (2017)> =2017ApJ...836..185T (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Radio continuum ; Magnetic fields Keywords: galaxies: ISM; galaxies: star formation; infrared: galaxies; radio continuum: galaxies; surveys Abstract: We study the spectral energy distribution (SED) of the radio continuum (RC) emission from the Key Insight in Nearby Galaxies Emitting in Radio (KINGFISHER) sample of nearby galaxies to understand the energetics and origin of this emission. Effelsberg multi-wavelength observations at 1.4, 4.8, 8.4, and 10.5GHz combined with archive data allow us, for the first time, to determine the mid-RC (1-10GHz, MRC) bolometric luminosities and further present calibration relations versus the monochromatic radio luminosities. The 1-10GHz radio SED is fitted using a Bayesian Markov Chain Monte Carlo technique leading to measurements for the nonthermal spectral index (Sνnt_^) and the thermal fraction (fth) with mean values of αnt=0.97±0.16 (0.79±0.15 for the total spectral index) and fth=(10±9)% at 1.4GHz. The MRC luminosity changes over ∼3 orders of magnitude in the sample, 4.3x102L<MRC<3.9x105L. The thermal emission is responsible for ∼23% of the MRC on average. We also compare the extinction-corrected diagnostics of the star-formation rate (SFR) with the thermal and nonthermal radio tracers and derive the first star-formation calibration relations using the MRC radio luminosity. The nonthermal spectral index flattens with increasing SFR surface density, indicating the effect of the star-formation feedback on the cosmic-ray electron population in galaxies. Comparing the radio and IR SEDs, we find that the FIR-to-MRC ratio could decrease with SFR, due to the amplification of the magnetic fields in star-forming regions. This particularly implies a decrease in the ratio at high redshifts, where mostly luminous/star-forming galaxies are detected. Description: The KINGFISH sample consists of 61 nearby galaxies of different morphological types. From this sample, we selected all galaxies with declinations ≥-21° and named this subsample KINGFISHER (KINGFISH galaxies Emitting in Radio). These galaxies can be observed with the Effelsberg 100m single-dish telescope to obtain global measurements of the radio continuum at 20cm, 6cm, and 3.6cm. The non-KINGFISH galaxy, M51, is also included in this study. We observed 35 of these galaxies at 6cm, 10 galaxies at 20cm, and 7 at 3.6cm to complete already existing archival data during four observation runs (2008 Dec, 2009 Dec, 2010 Apr and 2010 Dec & 2012 Mar). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 85 51 Basic properties of the galaxy sample table4.dat 119 51 Radio monochromatic flux densities and the mid-radio continuum (1-10GHz) luminosities refs.dat 347 30 References
See also: VII/109 : IRAS Observations of Large Optical Galaxies (Rice+, 1988) VIII/17 : The North 20cm Survey (White+ 1992) VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) J/AJ/80/771 : 5-GHz Survey of Bright Galaxies (Sramek 1975) J/ApJS/36/53 : 2380 MHz survey of bright galaxies (Dressel+, 1978) J/ApJ/378/65 : 8.4GHz observations of compact starbursts (Condon+ 1991) J/A+AS/114/21 : Shapley-Ames Galaxies at 2.8cm (Niklas+, 1995) J/ApJ/586/794 : Multiwavelength luminosities of galaxies (Bell, 2003) J/A+A/418/1 : Radio continuum spectra in Virgo cluster reg. (Vollmer+, 2004) J/ApJ/633/871 : Positions and photometry of HII knots in M51 (Calzetti+, 2005) J/ApJ/622/772 : Redshift survey of submillimeter galaxies (Chapman+, 2005) J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+, 2007) J/AJ/136/2782 : Star formation efficiency in nearby galaxies (Leroy+, 2008) J/ApJ/703/1672 : Far-IR and Hα fluxes in galaxies (Kennicutt+, 2009) J/ApJ/692/556 : Star forming galaxy templates (Rieke+, 2009) J/ApJ/714/1256 : Far-IR star formation rate indicators (Calzetti+, 2010) J/ApJ/731/L41 : 1.4GHz obs. of bright early-type galaxies (Brown+, 2011) J/ApJ/761/140 : Spectroscopy of Herschel-SPIRE galaxies (Casey+, 2012) J/ApJ/745/95 : Herschel FIR & submm photom. of KINGFISH sample (Dale+, 2012) J/A+A/555/A23 : M82-A radio continuum & polarisation study I. (Adebahr+, 2013) J/A+A/552/A19 : Radio-farIR correlation in NGC 6946 (Tabatabaei+, 2013) J/A+A/568/A74 : Low-frequency (115-175MHz) image of M51 (Mulcahy+, 2014) J/A+A/578/A93 : IC 342 multi-frequency radio polarization study (Beck, 2015) J/A+A/576/A33 : KINGFISH galaxy sample radial profile SED (Hunt+, 2015) J/AJ/149/32 : Integrated radio continuum spectra of galaxies (Marvil+, 2015) J/A+A/588/A114 : M101 polarization & magnetic structure (Berkhuijsen+, 2016) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Name Galaxy identifier 10- 11 I2 h RAh Hour of Right Ascension (J2000) 13- 14 I2 min RAm Minute of Right Ascension (J2000) 16- 19 F4.1 s RAs Second of Right Ascension (J2000) 21 A1 --- DE- Sign of the Declination (J2000) 22- 23 I2 deg DEd Degree of Declination (J2000) 25- 26 I2 arcmin DEm Arcminute of Declination (J2000) 28- 29 I2 arcsec DEs Arcsecond of Declination (J2000) 31- 36 A6 --- MType Hubble morphological type from NED 38- 48 A11 --- Size NED angular size; arcmin x arcmin 50- 51 I2 deg i [12/83] Inclination (1) 53 I1 --- r_i [2]? Flag on i (see refs.dat file) 55- 59 F5.2 Mpc Dist [3/31] Distance (2) 61 I1 --- r_Dist [3]? Flag on Dist (see refs.dat file) 63- 68 A6 --- NType Nuclear type ("AGN": 15 occurrences, "SF": 24 occurrences or "SF/AGN": 4 occurrences) (2) 70 I1 --- r_NType [4]? Flag on NType (see refs.dat file) 72- 75 F4.1 [Lsun] logL [6.5/11] log total IR luminosity (3) 77 I1 --- r_logL [1/5]? Flag on logL (see refs.dat file) 79- 83 F5.3 Msun/yr SFR [0.001/8]? Star Formation Rate (2) 85 I1 --- r_SFR [6]? Flag on SFR (see refs.dat file)
Note (1): From Hunt+ (2015, J/A+A/576/A33) and references therein. Note (2): From Kennicutt+ (2011PASP..123.1347K) and references therein. Note (3): Dale+ (2012, J/ApJ/745/95).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Name Galaxy name 10 A1 --- l_S10.7 Limit flag on S10.7 11- 13 I3 mJy S10.7 [3/376]? Flux density at 10.7GHz 15- 16 I2 mJy e_S10.7 ? Uncertainty in S10.7 18 A1 --- r_S10.7 Kbegmy]`Flag on S10.7 (see refs.dat file) 20- 24 F5.1 mJy S8.4 [3/430]? Flux density at 8.4GHz 26- 30 F5.1 mJy e_S8.4 ? Uncertainty in S8.4 32 A1 --- r_S8.4 [abkmop] Flag on S8.4 (see refs.dat file) 34- 36 I3 mJy S5 [13/472]? Flux density at 5GHz 38- 39 I2 mJy e_S5 ? Uncertainty in S5 41 A1 --- r_S5 [gv] Flag on S5 (see refs.dat file) 43 A1 --- l_S4.8 Limit flag on S4.8 44- 49 F6.2 mJy S4.8 [0.4/860]? Flux density at 4.8GHz 51- 55 F5.1 mJy e_S4.8 ? Uncertainty in S4.8 57 A1 --- r_S4.8 [abciklms] Flag on S4.8 (see refs.dat file) 59- 61 I3 mJy S3.7 [254]? Flux density at 3.7GHz 63- 64 I2 mJy e_S3.7 ? Uncertainty in S3.7 66 A1 --- r_S3.7 [g] Flag on S3.7 (see refs.dat file) 68- 70 I3 mJy S2.7 [8/794]? Flux density at 2.7GHz 72- 73 I2 mJy e_S2.7 ? Uncertainty in S2.7 75 A1 --- r_S2.7 [bghjq] Flag on S2.7 (see refs.dat file) 77 A1 --- l_S1.4 Limit flag on S1.4 (1) 78- 83 F6.1 mJy S1.4 [1.5/1800]? Flux density at 1.4GHz 85- 89 F5.1 mJy e_S1.4 ? Uncertainty in S1.4 91 A1 --- r_S1.4 Flag on S1.4 (see refs.dat file) 93- 96 I4 mJy S1.36 [49/1100]? Flux density at 1.36 GHz 98- 99 I2 mJy e_S1.36 ? Uncertainty in S1.36 101 A1 --- r_S1.36 [f] Flag on S1.36 (see refs.dat file) 103-106 F4.2 [Lsun] MRC [2.6/5.6]? Log mid-radio continuum luminosity (2) 108-111 F4.1 10-10T B [4/28]? Magnetic field in µGauss 113-115 F3.1 10-10T E_B ? Upper limit on B 117-119 F3.1 10-10T e_B ? Lower limit on B
Note (1): Upper limits at 20cm (1.4GHz) refer to the 3σ limit of the NVSS at these positions. Note (2): Calculated using Equation (6). See section 4.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1 A1 --- Ref Reference code 3- 21 A19 --- BibCode Bibcode of the reference 23- 39 A17 --- Auth First author name(s) 41-347 A307 --- Comm Comment
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Oct-2017
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