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J/ApJ/719/1191     Mid-IR indicators of SF and AGN in galaxies   (Treyer+, 2010)

Mid-infrared spectral indicators of star formation and active galactic nucleus activity in normal galaxies. Treyer M., Schiminovich D., Johnson B.D., O'Dowd M., Martin C.D., Wyder T., Charlot S., Heckman T., Martins L., Seibert M., van der Hulst J.M. <Astrophys. J., 719, 1191-1211 (2010)> =2010ApJ...719.1191T
ADC_Keywords: Galaxies, IR ; Spectra, infrared ; Line Profiles ; Interstellar medium ; Equivalent widths Keywords: galaxies: active - galaxies: ISM - galaxies: star formation - infrared: galaxies - surveys Abstract: We investigate the use of mid-infrared (MIR) polycyclic aromatic hydrocarbon (PAH) bands, the continuum, and emission lines as probes of star formation (SF) and active galactic nucleus (AGN) activity in a sample of 100 "normal" and local (z∼0.1) emission-line galaxies. The MIR spectra were obtained with the Spitzer Space Telescope Infrared Spectrograph as part of the Spitzer-SDSS-GALEX Spectroscopic Survey (SSGSS), which includes multi-wavelength photometry from the ultraviolet to the far-infrared and optical spectroscopy. The continuum and features were extracted using PAHFIT, a decomposition code which we find to yield PAH equivalent widths (EWs) up to ∼30 times larger than the commonly used spline methods. Despite the lack of extreme objects in our sample (such as strong AGNs, low-metallicity galaxies, or ULIRGs), we find significant variations in PAH, continuum, and emission-line properties, and systematic trends between these MIR properties and optically derived physical properties, such as age, metallicity, and radiation field hardness. We revisit the diagnostic diagram relating PAH EWs and [NeII]12.8um/[OIV]25.9um line ratios and find it to be in much better agreement with the standard optical SF/AGN classification than when spline decompositions are used, while also potentially revealing obscured AGNs. Description: The Spitzer-SDSS-GALEX Spectroscopic Survey (SSGSS) is an MIR spectroscopic survey of 101 local star-forming galaxies using the IRS on board the Spitzer satellite. The sample is drawn from the Lockman Hole region which has been extensively surveyed at multiple wavelengths. A detailed description of the data acquisition and reduction can be found in O'Dowd et al. (2011, Cat. J/ApJ/741/79). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 101 82 Absorption corrected continuum, PAH and line fluxes derived from the PAHFIT decompositions table2.dat 20 82 Aperture corrections in magnitudes table3.dat 56 82 PAH equivalent widths
See also: J/ApJ/741/79 : The Spitzer-SDSS-GALEX Spectroscopic Survey (O'Dowd+, 2011) J/ApJ/705/885 : PAH in galaxies at z∼0.1 (O'Dowd+, 2009) J/A+A/507/713 : Galaxies with strong PAH emission (Haas+, 2009) J/ApJ/686/127 : Starbursts luminosities based on PAH (Weedman+, 2008) : SSGSS home page Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 3 I3 --- SSGSS [1/99] Identification number 5- 9 F5.2 10+10Jy.Hz C8 Absorption corrected 8um continuum flux (1) 11- 14 F4.2 10+10Jy.Hz e_C8 Uncertainty in C8 16- 20 F5.2 10+10Jy.Hz C16 Absorption corrected 16um continuum flux (1) 22- 25 F4.2 10+10Jy.Hz e_C16 Uncertainty in C16 27- 31 F5.2 10+10Jy.Hz C24 Absorption corrected 24um continuum flux (1) 33- 37 F5.2 10+10Jy.Hz e_C24 Uncertainty in C24 39- 43 F5.2 10+10Jy.Hz P7.7 PAH 7.7 micron flux 45- 48 F4.2 10+10Jy.Hz e_P7.7 Uncertainty in PAH7.7 50- 53 F4.2 10+10Jy.Hz P17 PAH 17 micron flux 55- 58 F4.2 10+10Jy.Hz e_P17 Uncertainty in PAH17 60- 64 F5.2 10+8.Jy.Hz L12.8 The [NeII] 12.8 micron flux 66- 69 F4.2 10+8.Jy.Hz e_L12.8 Uncertainty in L12.8 71- 74 F4.2 10+8.Jy.Hz L15.5 The [NeIII] 15.5 micron line flux 76- 79 F4.2 10+8.Jy.Hz e_L15.5 Uncertainty in L15.5 81- 84 F4.2 10+8.Jy.Hz L25.9 The [OIV] 25.9 micron line flux 86- 90 F5.2 10+8.Jy.Hz e_L25.9 Uncertainty in L25.9 92- 96 F5.2 10+8.Jy.Hz LH2 Sum of H2S(0) to S(2) lines flux 98-101 F4.2 10+8.Jy.Hz e_LH2 Uncertainty in LH2
Note (1): Defined as νFν.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 3 I3 --- SSGSS [1/99] Identification number 5- 8 F4.2 mag AC8 Spitzer/IRAC 8 micron aperture correction 10- 14 F5.2 mag AC16 Spitzer/IRS 16 micron aperture correction 16- 20 F5.2 mag AC24 Spitzer/MIPS 24 micron aperture correction
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 3 I3 --- SSGSS [1/99] Identification number 5- 9 F5.2 um W6.2 PAH 6.2 micron feature equivalent width 11- 14 F4.2 um e_W6.2 Uncertainty in W6.2 16- 20 F5.2 um W7.7 PAH 7.7 micron feature equivalent width 22- 26 F5.2 um e_W7.7 Uncertainty in W7.7 28- 31 F4.2 um W8.6 PAH 8.6 micron feature equivalent width 33- 36 F4.2 um e_W8.6 Uncertainty in W8.6 38- 41 F4.2 um W11.3 PAH 11.3 micron feature equivalent width 43- 46 F4.2 um e_W11.3 Uncertainty in W11.3 48- 51 F4.2 um W17 PAH 17 micron feature equivalent width 53- 56 F4.2 um e_W17 Uncertainty in W17
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 19-Jun-2012
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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