J/ApJS/281/57 Star formation rates of SDSS z<0.3 galaxies (Le+, 2025)
A comparison of star formation rates by different tracers in nearby galaxies.
Le H.A.N., Woo J.-H., Xue Y., Ayubinia A., Kim C., Lin X.
<Astrophys. J. Suppl. Ser., 281, 57 (2025)>
=2025ApJS..281...57L 2025ApJS..281...57L
ADC_Keywords: Galaxies, spectra; Active gal. nuclei; Galaxies, Seyfert;
Redshifts; Spectra, optical
Keywords: Active galaxies ; Star formation
Abstract:
We utilize a large sample of ∼113,000 galaxies (z<0.3) from the Sloan
Digital Sky Survey with high-quality data to compare star formation
rates (SFRs) across multiple diagnostic methods and examine their
connection to the strength of active galactic nuclei (AGNs), indicated
by Eddington ratio. Our sample encompassed star-forming, composite,
Seyfert, and LINER galaxies. Our analysis utilizes various SFR
indicators, including observed infrared flux (SFRFIR) from
AKARI/Herschel (∼4100 sources), the MPA-JHU catalog (SFRDn4000), the
artificial neural network (ANN) catalog (SFRANN), the GSWLC catalog
(SFRSED and SFRMIR), as well as [OII] and Hα emission lines
(SFR[OII] and SFRHα). Within star-forming galaxies, SFR
measurements from different tracers exhibited differences, with
offsets and scatter below 0.26 and 0.29 dex, respectively. Moreover,
non-star-forming galaxies (composite, Seyfert, and LINER) displayed
discrepancies among SFR tracers, particularly for LINER galaxies, with
offsets below 0.86 dex and a scatter of 0.57 dex. Additionally, our
findings revealed robust correlations between SFRs and specific SFRs
(sSFRs) with Eddington ratios. The Eddington ratio exhibited gradual
transitions in the (s)SFRs-stellar mass diagrams. Galaxies with high
Eddington ratios displayed high star formation activity, similar to
blue star-forming galaxies. Furthermore, we observed decreasing sSFR
trends from star-forming galaxies to composite, Seyfert, and LINER
galaxies. Our results may provide insight into our understanding of
(s)SFRs traced by different approaches and their connection to AGN
activities.
Description:
We selected the sample from the MPA-JHU catalog, based on the Sloan
Digital Sky Survey (SDSS) Data Release 7 (see II/294).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 155 112573 Target properties
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/ApJ/666/806 : SED of Spitzer quasars (QUEST) (Netzer+, 2007)
J/ApJ/720/368 : Color-magnitude relations of galaxies in CDFs (Xue+, 2010)
J/MNRAS/455/370 : Predicted LIR for SDSS galaxies (Ellison+, 2016)
J/ApJ/859/11 : The GALEX-SDSS-WISE Legacy Catalog 2 (GSWLC-2) (Salim+, 2018)
http://wwwmpa.mpa-garching.mpg.de/SDSS/ : MPA/JHU SDSS online catalogs
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- ObjID Object ID
14- 24 F11.7 deg RAdeg Right Ascension (J2000)
26- 36 F11.7 deg DEdeg [-11.3/70.3] Declination (J2000)
38- 41 I4 --- Plate [266/2974] Plate number of the SDSS
spectrum
43- 45 I3 --- Fiber [1/640] Fiber ID of the SDSS spectrum
47- 51 I5 d MJD [51608/54592] Modified Julian Date of
the SDSS spectrum
53- 57 F5.2 --- SNsp [10/82] Optical continuum 5100Å
spectrum signal-to-noise
59- 63 F5.3 --- zppxf [0.003/0.3] pPXF measured redshift
65- 67 F3.1 --- OClass [1/4] Classification of targets (1)
69- 75 F7.5 --- fAGN [0/1] Rainbow package calculated AGN
fraction
77- 85 F9.3 mag umagTot [14.68/30.85]?=-9999 SDSS u-band MODELMAG
87- 95 F9.3 mag umagFib [16.43/30.51]?=-9999 SDSS u-band FIBERMAG
97- 103 F7.4 [Msun] logMs [6.17/12.64]?=-1 Log, measured stellar
mass (2)
105- 109 F5.3 --- Dn4000 [0/3.8] Measured Dn(4000) flux (2)
111- 115 F5.3 --- e_Dn4000 [0/0.9] Uncertainty in Dn4000 (2)
117- 125 F9.4 [Msun/yr] logSFROII [-19.6/16.4]?=-999 Log, star formation
rate, [OII] emission line
127- 135 F9.4 [Msun/yr] e_logSFROII [0/2]?=-999 Uncertainty in logSFR-OII
137- 145 F9.4 [Msun/yr] logSFRHa [-18.7/11.3]?=-999 Log, star formation
rate, Hα emission line
147- 155 F9.4 [Msun/yr] e_logSFRHa [0/1969]?=-999 Uncertainty in logSFR-Ha
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Note (1): Classification of targets as follows:
1.0 = Composite (20681 occurrences)
2.0 = SF galaxy (69165 occurrences)
3.0 = Seyfert (14049 occurrences)
4.0 = LINER (8678 occurrences)
Note (2): Taken from the MPA-JHU catalog
(http://wwwmpa.mpa-garching.mpg.de/SDSS/)
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History:
From electronic version of the journal
License: CC-BY-4.0
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 29-Jun-2026