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J/ApJ/805/31 IR-radio luminosities & surface densities of galaxies  (Liu+, 2015)

The global star formation laws of galaxies from a radio continuum perspective. Liu L., Gao Y., Greve T.R. <Astrophys. J., 805, 31 (2015)> =2015ApJ...805...31L (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Radio continuum ; Galaxies, IR Keywords: galaxies: evolution; galaxies: ISM; galaxies: spiral; galaxies: starburst; stars: formation Abstract: We study the global star formation law --the relation between gas and star formation (SF) rates-- in a sample of 181 local galaxies with infrared (IR) luminosities spanning almost five orders of magnitude (107.8-1012.3L), which includes 115 normal spiral galaxies and 66 (ultra)luminous IR galaxies ((U)LIRGs, LIR≫1011L). We derive their atomic, molecular gas, and dense molecular gas masses using newly available HI, CO, and HCN data from the literature, and SF rates are determined both from total IR (8-1000um) and 1.4GHz radio continuum (RC) luminosities. In order to derive the disk-averaged surface densities of gas and SF rates, we have taken a novel approach and used high-resolution RC observations to measure the radio sizes for all 181 galaxies. In our sample, we find that the surface density of dense molecular gas (as traced by HCN) has the tightest correlation with that of SF rates (ΣSFR), and is linear in log-log space (power-law slope of N=1.01±0.02) across the full galaxy sample. The correlation between surface densities of molecular gas (ΣH2, traced by CO) and ΣSFR is sensitive to the adopted value of the CO-to-H2 conversion factor (αCO) used to infer molecular gas masses from CO luminosities. For a fixed Galactic value of αCO, a power law index of 1.14±0.02 is found. If instead we adopt values for αCO of 4.6 and 0.8 for disk galaxies and (U)LIRGs, respectively, we find the two galaxy populations separate into two distinct ΣSFR versus ΣH2 relations. Finally, applying a continuously varying αCO to our sample, we recover a single ΣSFRH2 relation with slope of 1.60±0.03. The ΣSFR is a steeper function of total gas Σgas (molecular gas with atomic gas) than that of molecular gas ΣH2, and are tighter among low-luminosity galaxies. We find no correlation between global surface densities of SFRs and atomic gas (HI). Description: HI maps or sizes for 95 of the 115 normal star-forming galaxies in our sample were obtained from HI imaging surveys carried out with the (J)VLA and the Westerbork Synthesis Radio Telescope (see section 2.2.1 for the detailed surveys used). Velocity-integrated CO fluxes were gathered from the literature and, when available, preference was given to CO fluxes derived directly from galaxy-integrated imaging measurements (see section 2.2.2). In order to obtain the largest possible HCN (1-0) sample, we collected all robust measurements available in the literature (see section 2.2.3). Total-IR 8-1000um luminosities were calculated using 12, 25, 60, 100um photometry from the Infrared Astronomical Satellite (IRAS) and the formulas presented in Table 1 of Sanders & Mirabel (1996ARA&A..34..749S). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 74 181 Luminosities table2.dat 101 181 Surface density refs.dat 102 92 References
See also: VIII/81 : Sydney University Molonglo Sky Survey (SUMSS V2.1) (Mauch+ 2008) VIII/71 : The FIRST Survey Catalog, Version 03Apr11 (Becker+ 2003) VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) II/156 : IRAS Faint Source Catalog, |b| > 10, Version 2.0 (Moshir+ 1989) II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986) J/AJ/144/134 : LITTLE THINGS survey of nearby dwarf galaxies (Hunter+, 2012) J/ApJ/723/993 : Spatial extent of (U)LIRGs in the MIR. I. (Diaz-Santos+, 2010) J/A+A/522/A3 : M33 CO(2-1) and HI integrated intensity maps (Gratier+, 2010) J/ApJ/704/842 : VIRUS-P spectroscopy of NGC 5194 (Blanc+, 2009) J/AJ/136/2782 : Star formation efficiency in nearby galaxies (Leroy+, 2008) J/AJ/136/2563 : HI Nearby Galaxy Survey, THINGS (Walter+, 2008) J/ApJ/671/333 : Aperture photometry in NGC 5194 (Kennicutt+, 2007) J/A+A/462/507 : AMIGA III. IRAS data (Lisenfeld+, 2007) J/A+A/462/81 : LIR-Tdust relation in galaxies (Chanial+, 2007) J/A+A/442/137 : HI observations of WHISP disk galaxies (Noordermeer+, 2005) J/AJ/126/1607 : IRAS Revised Bright Galaxy Sample (Sanders+, 2003) J/A+A/390/863 : CCD R Photometry of WHISP Dwarf Galaxies (Swaters, 2002) J/ApJ/554/803 : New VLA Sky Survey (NVSS) of IRAS 2 Jy Galaxies (Yun+ 2001) J/A+AS/131/73 : Catalogue of HI maps of galaxies. I. (Martin 1998) J/A+AS/115/439 : CO survey of galaxies (Elfhag+, 1996) J/A+AS/115/407 : Short WSRT HI observations of spiral galaxies (Rhee+, 1996) J/ApJS/73/359 : 1.49 GHz atlas of the IRAS bright galaxies (Condon+, 1990) J/ApJS/65/485 : 1.49GHz Atlas of Spiral Galaxies (Condon, 1987) : NRAO archive home page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Type Galaxy type: "Normal" Galaxies or "(U)LIRG" = (ultra)luminous IR Galaxy 8- 15 A8 --- --- [Galaxies ] 17- 26 A10 --- Name Identifier 28- 33 F6.2 Mpc Dist [0.8/313.6] Distance 35- 40 F6.2 LCO [0.01/226.5] The CO line luminosity 42- 46 F5.2 LHCN [0.02/50.6]? The HCN line luminosity 48- 52 F5.2 Lsun LIR [7.8/12.5] Total 8-1000 micron luminosity 54- 59 F6.2 ZW/Hz LRC [-6.4/864] The 1.4GHz radio continuum luminosity (in 10+21W.Hz-1) 61- 74 A14 --- Ref Luminosity references (see refs.dat file)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Type Galaxy type: "Normal" Galaxies or "(U)LIRG" = (ultra)luminous IR Galaxy 8- 15 A8 --- --- [Galaxies ] 17- 26 A10 --- Name Galaxy identifier 28- 34 F7.2 arcsec Diam1 Diameter (deconvolved major axes) 36- 39 F4.2 arcsec Diam2 ? Second diameter for interacting galaxies (1) 41- 45 F5.2 [Msun/pc2] logSHI [-0.6/1.3]? Log HI atomic surface density 47- 51 F5.2 [Msun/pc2] logSH2a [-0.4/6.1] Log molecular H2 gas mass surface density (2) 53- 57 F5.2 [Msun/pc2] logSH2b [-0.2/4.9] Log molecular H2 gas mass surface density (3) 59- 63 F5.2 [Msun/pc2] logSgas [-0.2/6.1] Log total gas surface density 65- 69 F5.2 [Msun/pc2] logSden [-0.5/5.5]? Log dense molecular gas surface density 71- 75 F5.2 [Msun/yr/kpc2] logSIR [-2.8/3.9] Star formation rate from 8-1000µm 77- 81 F5.2 [Msun/yr/kpc2] logSRC [-3.2/3.6] Star formation rate from 1.4GHz radio continuum 83- 89 A7 --- Ref2 References (see refs.dat file) 91-101 A11 --- NRAO Project code(s) in NRAO archive (4)
Note (1): For interacting galaxies which clearly show two independent components, such as Arp 055 and Arp 220, we gave the radio sizes for both components. Note (2): Calculated using a fixed CO-to-H2 conversion factor value of 4.6 solar masses ( Note (3): Calculated using continuously-varying αCO. Note (4): See NRAO archive ( The (J)VLA observation project codes were given for the radio images reduced in this work. Two project codes were given in the cases that the data sets from two different (J)VLA configurations were combined.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 3 I3 --- Ref [1/140] Reference code (1) 5- 23 A19 --- BibCode Bibcode 25- 47 A23 --- Auth First author's name(s) 49-102 A54 --- Comm Comment
Note (1): Reference number 1-19 are for CO data, 20-35 are for HCN data, 36-41 for IR data and 42-52 for 1.4GHz radio continuum data; 101-112 are references for the Radio map and 113-140 for the HI atomic surface density.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 03-Sep-2015
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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