J/ApJ/872/16 Integrated star formation law revisited. I. (de los Reyes+, 2019)
Revisiting the integrated star formation law.
I. Non-starbursting galaxies.
de los Reyes M.A.C., Kennicutt R.C.
<Astrophys. J., 872, 16 (2019)>
=2019ApJ...872...16D 2019ApJ...872...16D
ADC_Keywords: Galaxies, photometry; Ultraviolet; Infrared; Abundances;
References; Radio sources
Keywords: galaxies: dwarf ; galaxies: spiral ; galaxies: star formation
Abstract:
We use new and updated gas- and dust-corrected star formation rate
(SFR) surface densities to revisit the integrated star formation law
for local "quiescent" spiral, dwarf, and low surface brightness
galaxies. Using UV-based SFRs with individual IR-based dust
corrections, we find that "normal" spiral galaxies alone define a
tight Σ(HI+H2)-ΣSFR_ relation described by an
n=1.41-0.07+0.07 power law with a dispersion of 0.28-0.02+0.02
(errors reflect fitting and statistical uncertainties). The SFR
surface densities are only weakly correlated with HI surface
densities alone, exhibiting a stronger and roughly linear correlation
with H2 surface densities, similar to what is seen in spatially
resolved measurements of disks. However, many dwarf galaxies lie below
the star formation law defined by spirals, suggesting a low-density
threshold in the integrated star formation law. We consider
alternative scaling laws that better describe both spirals and dwarfs.
Our improved measurement precision also allows us to determine that
much of the scatter in the star formation law is intrinsic, and we
search for correlations between this intrinsic scatter and secondary
physical parameters. We find that dwarf galaxies exhibit second-order
correlations with the total gas fraction, stellar mass surface
density, and dynamical time, which may explain much of the scatter in
the star formation law. Finally, we discuss various systematic
uncertainties that should be kept in mind when interpreting any study
of the star formation law, particularly the X(CO) conversion factor
and the diameter chosen to define the star-forming disk in a galaxy.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 111 307 General properties of sample
table2.dat 86 307 UV photometric data
table3.dat 83 307 IR photometric data
table4.dat 94 307 SFRs, gas masses, and SFR and gas surface densities;
from erratum published in 2019, ApJ, 878, 74
table5.dat 63 307 Other properties of sample
refs.dat 196 141 References
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See also:
II/328 : AllWISE Data Release (Cutri+ 2013)
VII/155 : Third Reference Cat. of Bright Galaxies (RC3) (de Vaucouleurs+ 1991)
J/A+AS/115/407 : Short WSRT HI observations of spiral galaxies (Rhee+, 1996)
J/A+A/324/877 : HI properties of spiral & irregular galaxies (Broeils+, 1997)
J/A+A/370/765 : HI synthesis observations in UMa cluster (Verheijen+, 2001)
J/AJ/126/1607 : IRAS Revised Bright Galaxy Sample (Sanders+, 2003)
J/A+A/442/137 : HI observations of WHISP disk galaxies (Noordermeer+, 2005)
J/ApJS/164/81 : Spectrophotometry of nearby galaxies (Moustakas+, 2006)
J/PASP/119/994 : MIPS 24um calibrators (Engelbracht+, 2007)
J/ApJS/173/185 : GALEX UV atlas of nearby galaxies (Gil de Paz+, 2007)
J/ApJ/671/333 : Aperture photometry in NGC 5194 (Kennicutt+, 2007)
J/ApJS/173/538 : XUV-Disk galaxies in the Local Universe (Thilker+, 2007)
J/ApJS/178/247 : Hα and [NII] survey in local 11 Mpc (Kennicutt+, 2008)
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/703/517 : The Spitzer Local Volume Legacy: IR photometry (Dale+, 2009)
J/ApJ/706/599 : Hα and UV SFR in the local volume (Lee+, 2009)
J/ApJS/190/233 : Spectroscopy & abundances of SINGS gal. (Moustakas+, 2010)
J/PASP/122/1397 : Spitzer Survey of Stellar Structure in Gal. (Sheth+, 2010)
J/ApJS/192/6 : A GALEX UV imaging survey of nearby galaxies (Lee+, 2011)
J/ApJ/733/87 : Star formation efficiency in galaxies (Shi+, 2011)
J/MNRAS/414/940 : ATLAS3D project. IV. (Young+, 2011)
J/MNRAS/423/197 : MIPS photometry for Herschel SAG2 Programs (Bendo+, 2012)
J/A+A/544/A101 : GALEX obs. of Herschel Reference Survey (Cortese+, 2012)
J/AJ/144/134 : LITTLE THINGS survey of nearby dwarf galaxies (Hunter+, 2012)
J/ApJ/771/59 : S4G face-on gal. surface brightnesses (Munoz-Mateos+, 2013)
J/A+A/564/A65 : Cold gas data of Herschel Reference Survey (Boselli+, 2014)
J/MNRAS/445/899 : LVL SEDs and physical properties (Cook+, 2014)
J/A+A/566/A71 : HI study of 18 nearby dwarf galaxies (Lelli+, 2014)
J/A+A/569/A124 : GUViCS. Ultraviolet Source Catalogs (Voyer+, 2014)
J/ApJS/220/6 : Updated catalog of GALEX nearby galaxies (Bai+, 2015)
J/ApJ/805/31 : IR-Rad luminosities & surface densities of gal. (Liu+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/307] Running index number
5- 26 A22 --- Name Galaxy ID preferred by NED (G1)
28- 29 I2 h RAh Hour of Right Ascension (J2000)
31- 32 I2 min RAm Minute of Right Ascension (J2000)
34- 38 F5.2 s RAs Second of Right Ascension (J2000)
40 A1 --- DE- Sign of the Declination (J2000)
42- 43 I2 deg DEd Degree of Declination (J2000)
45- 46 I2 arcmin DEm Arcminute of Declination (J2000)
48- 51 F4.1 arcsec DEs Arcsecond of Declination (J2000)
53- 57 F5.2 Mpc Dist [0.5/75.4]? Distance (1)
59- 63 F5.2 mag Bmag [4.16/15.8]? Apparent B-band (AB)
magnitude (2)
65- 68 F4.2 mag e_Bmag [0.04/0.99]? Mean error on Bmag (2)
70- 73 F4.2 mag B-V [0.21/1.07]? B-V color index (2)
75- 78 F4.2 mag e_B-V [0.01/0.19]? Mean error B-V (2)
80 A1 --- MType Galaxy type; s=spiral, d=dwarf
82- 89 F8.4 deg PA [-75/203] Position angle (2)
91- 94 F4.2 --- E(B-V) [0.01/0.8] Reddening E(B-V) (3)
96-100 I5 arcsec Diam25 [25/11433]? D25 diameter (2)
102-105 I4 arcsec DiamHa [8/5940] D(Halpha) diameter (4)
107-111 F5.3 --- b/a [0.1/1.0]? Axis ratio measured
from B-band isophotes (2)
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Note (1): Distance, adopted from the 11Mpc Hα UV Galaxy Survey
(11HUGS; Kennicutt+ 2008, J/ApJS/178/247) catalog when possible or
from NED otherwise.
Note (2): Obtained from from RC3 (de Vaucouleurs+ 1991, VII/155)
Note (3): Adopted from Schlegel+ (1998ApJ...500..525S 1998ApJ...500..525S) unless otherwise
noted in text.
Note (4): DHα diameter, defined as the semimajor axis of the region
containing ∼95% of the Hα flux (see Section 2.2).
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/307] Running index number
5- 26 A22 --- Name Galaxy ID preferred by NED (G1)
28 I1 --- l_UVmag [0/1] Upper limit flag on UVmag; 1=yes, 0=no
30- 33 F4.1 mag UVmag [8.2/20.7]? GALEX apparent UV magnitude
35- 37 F3.1 mag e_UVmag [0.1/1]? Mean error on UVmag
39- 41 I3 --- r_UVmag [401/408]? Reference for UVmag (see refs.dat file)
43- 50 F8.2 s tUV [87/21177.4]? Exposure time (5)
52- 83 A32 --- Tile GALEX tile name (5)
85- 86 I2 --- f_UVmag [0/1]? NUV flag; 1=only NUV available;
0=FUV used (5)
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Note (5): Values listed only for galaxies with UV fluxes measured in this paper.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq [1/307] Running index number
5- 26 A22 --- Name Galaxy ID preferred by NED (G1)
28 I1 --- l_IRflux [0/1] Upper limit flag on IR flux; 1=yes, 0=no
30- 37 E8.2 Jy IRflux [1.9e-05/139]? 24um IR flux density
39- 45 E7.1 Jy e_IRflux [0.0001/23]? Mean error on IRflux
47- 49 I3 --- r_IRflux [301/404] Reference for IRflux
(see refs.dat file)
51- 57 F7.2 s tIR [146.8/1404.7]? Exposure time (s) (6)
59- 65 A7 --- Survey For Spitzer MIPS images, name of survey (7)
67- 69 I3 --- Nfr [99/558]? For AllWISE images, number of frames
71- 83 A13 --- CoaddID For AllWISE images, the co-add ID
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Note (6): MIPS LG files (Bendo+ 2012MNRAS.423..197B 2012MNRAS.423..197B) do not list exposure times.
Note (7): Survey as follows:
LVL = Spitzer Local Volume Legacy; Dale+, 2009, J/ApJ/703/517 and
Lee+, 2011, J/ApJS/192/6
MIPS LG = MIPS 24-160um photometry for the Herschel-SPIRE Local Galaxies;
Bendo+, 2012, J/MNRAS/423/197
SINGS = Spitzer Infrared Nearby Galaxies Survey; Dale+ 2007ApJ...655..863D 2007ApJ...655..863D
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/307] Running index number
5- 26 A22 --- Name Galaxy ID preferred by NED (G1)
28 I1 --- l_logSFR [0/1]? Upper limit flag on logSFR
(1=yes)
30- 34 F5.2 [Msun/yr] logSFR [-4.5/1.5]? Log uncorrected SFR
36- 39 F4.2 [Msun/yr] e_logSFR [0.02/0.4]? Mean error on logSFR
41 I1 --- l_logSFRc [0/1]? Upper limit flag on logSFRc
(1=yes)
43- 47 F5.2 [Msun/yr] logSFRc [-5.4/1.5]? Log dust-corrected SFR
49- 52 F4.2 [Msun/yr] e_logSFRc [0.02/0.5]? Mean error on logSFRcorr
54- 58 F5.2 [Msun/yr/kpc2] logSigSFRc [-5.7/1.2]? Log dust-corrected SFR
surface density
60- 64 F5.2 [Msun/yr/pc2] logSigHI [-0.3/1.5]? Log HI surface density (8)
66- 76 A11 --- r_logSigHI Reference for logSigHI
(see refs.dat file)
78 I1 --- l_logSigH2 [0/1] Upper limit flag on logSigH2
(1=yes)
80- 84 F5.2 [Msun/yr/pc2] logSigH2 [-1.3/3.5]? Log H2 surface density (8)
86- 94 A9 --- r_logSigH2 Reference for logSigH2
(see refs.dat file)
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Note (8): As noted in the text, we assume conservative measurement
uncertainties of ±0.1dex for HI and H2 surface densities.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq [1/307] Running index number
5- 26 A22 --- Name Galaxy ID preferred by NED (G1)
28- 32 F5.2 [Msun] Mass [5.8/11.5]? Log stellar mass
34- 36 I3 --- r_Mass [501/503]? Reference for stellar mass
(see refs.dat file)
38- 41 F4.2 --- Z [7.3/9.2]? Gas-phase metallicity;
12+log[O/H]
43- 45 I3 --- r_Z [601/605]? Reference for Z
(see refs.dat file)
47- 50 F4.2 --- C42 [1.7/6.7]? Concentration index
52- 56 F5.2 10+8yr tDyn [0.2/17.4]? Dynamical time (9)
58- 63 F6.3 10-8kpc/yr vRot [0.6/43]? Rotational velocity (9)
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Note (9): References for dynamical time and rotational velocity are largely the
same as the references for HI and H2 listed in Table 4
(see refs.dat file).
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Ref [1/605] Reference code
5- 30 A26 --- Auth First author's name(s)
32- 50 A19 --- BibCode Bibcode of the reference
52-196 A145 --- Comm Comment
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Global notes:
Note (G1): AGC 110482, row 269, was a misprint for AGC 231980; corrected at CDS.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 30-Jul-2020