J/ApJ/758/1 SDSS-Spitzer AGN properties (LaMassa+, 2012)
Exploring the connection between star formation and active galactic nucleus
activity in the local universe.
LaMassa S.M., Heckman T.M., Ptak A., Schiminovich D., O'Dowd M.,
Bertincourt B.
<Astrophys. J., 758, 1 (2012)>
=2012ApJ...758....1L 2012ApJ...758....1L
ADC_Keywords: Active gal. nuclei ; Spectra, infrared ; Galaxies, optical ;
Equivalent widths ; Redshifts ; Surveys
Keywords: galaxies: active; galaxies: Seyfert; galaxies: star formation;
infrared: galaxies; techniques: spectroscopic
Abstract:
We study a combined sample of 264 star-forming, 51 composite, and 73
active galaxies using optical spectra from the Sloan Digital Sky
Survey (SDSS) and mid-infrared (mid-IR) spectra from the Spitzer
Infrared Spectrograph. We examine optical and mid-IR spectroscopic
diagnostics that probe the amount of star formation and relative
energetic contributions from star formation and an active galactic
nucleus (AGN). Overall we find good agreement between optical and
mid-IR diagnostics. Misclassifications of galaxies based on the SDSS
spectra are rare despite the presence of dust obscuration. The
luminosity of the [Ne II] 12.8µm emission line is well correlated
with the star formation rate measured from the SDSS spectra, and this
holds for the star-forming, composite, and AGN-dominated systems. AGNs
show a clear excess of [Ne III] 15.6µm emission relative to
star-forming and composite systems. We find good qualitative agreement
between various parameters that probe the relative contributions of
the AGN and star formation, including the mid-IR spectral slope, the
ratio of the [Ne V] 14.3µm to [Ne II] 12.8µm fluxes, the
equivalent widths of the 7.7µm, 11.3µm, and 17µm polycyclic
aromatic hydrocarbon (PAH) features, and the optical "D" parameter
which measures the distance at which a source lies from the locus of
star-forming galaxies in the optical BPT emission-line diagnostic
diagram. We also consider the behavior of the three individual PAH
features by examining how their flux ratios depend upon the degree of
AGN dominance. We find that the PAH 11.3µm feature is significantly
suppressed in the most AGN-dominated systems.
Description:
Optical spectra for the [OIII], SSGSS (Spitzer-SDSS-GALEX Spectroscopic
Survey (PI: D. Schiminovich)), and S5 (Spitzer SDSS Spectroscopic
Survey (PI: D. Schiminovich)) samples were drawn from SDSS, using the
MPA/JHU galaxy-value-added catalog.
The details of the Spitzer/IRS data reduction for the [OIII] and 12um
samples were presented in LaMassa et al. (2010ApJ...720..786L 2010ApJ...720..786L), the
SSGSS sample in O'Dowd et al. (2009, Cat. J/ApJ/705/885 & 2011,
Cat. J/ApJ/741/79), and the S5 sample in B. Bertincourt et al. (in
preparation), which follows the same procedures as O'Dowd et al.
Throughout this paper, we have adopted a cosmology of Ho=70km/s/Mpc,
ΩM=0.27, and Ωλ=0.73.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 64 33 Emission-line luminosities for SSGSS sample
(Spitzer-SDSS-GALEX Spectroscopic Survey)
table1b.dat 24 68 Additionnal SSGSS with equivalent widths
(table added by CDS)
table2.dat 64 224 Emission-line luminosities for S5 sample
(Spitzer SDSS Spectroscopic Survey)
table3.dat 88 20 Emission-line luminosities for [OIII] sample
table4.dat 88 29 Emission-line luminosities for 12um sample
table5.dat 80 101 PAH luminosities and EWs for SSGSS sample
table6.dat 80 238 PAH luminosities and EWs for S5 sample
table7.dat 86 20 PAH luminosities and EWs for [OIII] sample
table8.dat 86 29 PAH luminosities and EWs for 12um sample
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See also:
J/A+A/561/A33 : SDSS SF galaxies multi-wavelength study (Izotov+, 2014)
J/A+A/560/A99 : NIR spectra of Seyfert galaxies (van der Laan+, 2013)
J/ApJ/741/79 : The Spitzer-SDSS-GALEX Spectroscopic Survey (O'Dowd+, 2011)
J/ApJ/725/2270 : Mid-IR emission lines in AGNs (Pereira-Santaella+, 2010)
J/ApJ/709/1257 : Spitzer spectra of Seyfert galaxies. II. (Tommasin+, 2010)
J/ApJ/705/885 : PAH in galaxies at z∼0.1 (O'Dowd+, 2009)
J/ApJ/705/14 : Seyfert galaxies in the mid-IR (Deo+, 2009)
J/MNRAS/398/1165 : AGN in nearby galaxies (Goulding+, 2009)
J/ApJ/656/770 : Mid-IR spectrum of star-forming galaxies (Smith+, 2007)
J/A+A/418/465 : Mid-infrared and hard X-ray emission in AGN (Lutz+, 2004)
http://www.mpa-garching.mpg.de/SDSS/DR7 : MPA-JHU DR7 release of spectrum
measurements home page
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table[12].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq [1/101]? Source number, in Simbad
5- 11 F7.3 deg RAdeg [36.3/320.2] Right ascension (J2000)
13- 18 F6.3 deg DEdeg [-8.5/64.5] Declination (J2000)
20- 24 F5.3 --- z [0.04/0.2] Redshift
26- 29 A4 --- Type Object type: AGN, SF=Star-Forming galaxy,
Comp=composite
31 A1 --- l_NeII Limit flag on NeII
33- 37 F5.2 10+34W NeII [0.1/18.5] [NeII]12.81um emission line flux
(in 1041erg/s)
39- 42 F4.2 10+34W e_NeII [0.01/0.7]? NeII uncertainty
44- 47 F4.2 10+34W NeV [0.2/1.3]? [NeV]14.32um emission line flux
(in 1041erg/s)
49- 52 F4.2 10+34W e_NeV [0.02/0.2]? NeV uncertainty
54 A1 --- l_NeIII Limit flag on NeIII
56- 59 F4.2 10+34W NeIII [0.02/5] [NeIII]15.56um emission line flux
(in 1041erg/s)
61- 64 F4.2 10+34W e_NeIII [0.01/0.6]? NeIII uncertainty
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Byte-by-byte Description of file: table1b.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq [1/101] Source number
in Simbad
5- 11 F7.3 deg RAdeg [158.2/164.8] Right ascension (J2000) (1)
13- 18 F6.3 deg DEdeg [56.4/59.8] Declination (J2000) (1)
20- 24 F5.3 --- z [0.03/0.3] Redshift (1)
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Note (1): Positions and redshift from O'Dowd et al., 2011, Cat. J/ApJ/741/79
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Byte-by-byte Description of file: table[34].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 23 A23 --- Name Galaxy name
25- 31 F7.3 deg RAdeg Right ascension (J2000)
33- 40 F8.4 deg DEdeg Declination (J2000)
42- 46 F5.3 --- z [0.002/0.2] Redshift
48- 51 A4 --- Type Object type: AGN, SF=Star-Forming galaxy,
Comp=composite
53 A1 --- l_NeII Limit flag on NeII
55- 59 F5.2 10+34W NeII [0.04/35.7] [NeII]12.81um emission line flux
(in 1041erg/s)
61- 64 F4.2 10+34W e_NeII [0/2.5]? NeII uncertainty
66- 70 F5.2 10+34W NeV [0.01/49.1]? [NeV]14.32um emission line flux
(in 1041erg/s)
72- 75 F4.2 10+34W e_NeV [0/2.9]? NeV uncertainty
77 A1 --- l_NeIII Limit flag on NeIII
79- 83 F5.2 10+34W NeIII [0.06/79.3] [NeIII]15.56um emission line flux
(in 1041erg/s)
85- 88 F4.2 10+34W e_NeIII [0/1.8]? NeIII uncertainty
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Byte-by-byte Description of file: table[56].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Seq [1/101]? Source number, in Simbad
5- 11 F7.3 deg RAdeg [36.3/320.2]? Right ascension (J2000)
13- 18 F6.3 deg DEdeg [-8.5/64.5]? Declination (J2000)
20- 23 A4 --- Type Object type: AGN, SF=Star-Forming galaxy,
Comp=composite
25 A1 --- l_L7.7 Limit flag on L7.7
27- 32 F6.2 [10+34W] L7.7 [1.8/415]? log of 7.7um luminosity
34- 37 F4.2 [10+34W] e_L7.7 [0.09/7.5]? L7.7 uncertainty
39- 43 F5.2 um EW7.7 [0.4/47.2]? 7.7um equivalent width
45 A1 --- l_L11.3 Limit flag on L11.3
47- 52 F6.2 [10+34W] L11.3 [0.8/121]? log of 11.3um luminosity
54- 57 F4.2 [10+34W] e_L11.3 [0.02/1.6]? L11.3 uncertainty
59- 62 F4.2 um EW11.3 [0.3/7.7]? 11.3um equivalent width
64 A1 --- l_L17 Limit flag on L17
66- 70 F5.2 [10+34W] L17 [0.5/70]? log of 17um luminosity
72- 75 F4.2 [10+34W] e_L17 [0.04/4.4]? L17 uncertainty
77- 80 F4.2 um EW17 [0.1/7.7]? 17um equivalent width
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Byte-by-byte Description of file: table[78].dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 23 A23 --- Name Galaxy name
25- 28 A4 --- Type Object type (only for table 8)
30- 36 F7.2 [10+34W] L7.7 [0.8/2385]? log of 7.7um luminosity
38- 42 F5.2 [10+34W] e_L7.7 [0.01/17.6]? L7.7 uncertainty
44- 48 F5.2 um EW7.7 [0.09/10.1]? 7.7um equivalent width
50 A1 --- l_L11.3 Limit flag on L11.3
52- 56 F5.2 [10+34W] L11.3 [0.1/93]? log of 11.3um luminosity
58- 61 F4.2 [10+34W] e_L11.3 [0/3.6]? L11.3 uncertainty
63- 66 F4.2 um EW11.3 [0.04/2.3]? 11.3um equivalent width
68 A1 --- l_L17 Limit flag on L17
70- 75 F6.2 [10+34W] L17 [0.2/359]? log of 17um luminosity
77- 81 F5.2 [10+34W] e_L17 [0.01/11.1]? L17 uncertainty
83- 86 F4.2 um EW17 [0.04/5.5]? 17um equivalent width
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 27-Jun-2014