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J/ApJ/671/323   Spitzer Spectra of a 10mJy galaxy sample        (Houck+, 2007)

Spitzer spectra of a 10mJy galaxy sample and the star formation rate in the Local universe. Houck J.R., Weedman D.W., Le Floc'h E., Hao L. <Astrophys. J., 671, 323-332 (2007)> =2007ApJ...671..323H
ADC_Keywords: Galaxies, IR ; Spectra, infrared Keywords: dust, extinction - infrared: galaxies - galaxies: starburst Abstract: A complete flux-limited sample of 50 galaxies is presented having fν(24um)>10mJy, chosen from a survey with MIPS on Spitzer of 8.2deg2 in the NOAO Deep Wide-Field Survey (NDWFS) region in Bootes. Spectra obtained with the low-resolution modules of IRS on Spitzer are described for 36 galaxies in this sample; 25 show strong PAH emission features characteristic of starbursts, and 11 show silicate absorption or emission, emission lines, or featureless spectra characteristic of AGNs. Infrared or optical spectral classifications are available for 48 of the entire sample of 50; 33 galaxies are classified as starbursts and 15 as AGNs. Description: Of the 50 sources, we describe new IRS results for 26 sources in our program and 10 from the Spitzer public archive (program 20113; H. Dole, in preparation). Adding optical spectral classifications from the Sloan Digital Sky Survey (SDSS) allows the spectroscopic classification of the sources as starbursts or AGNs for 48 of the 50 sources in the complete sample. Spitzer spectroscopic observations were made with the IRS3 Short-Low module in orders 1 and 2 (SL1 and SL2) and with the Long-Low module in orders 1 and 2 (LL1 and LL2). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 100 50 The Bootes 10mJy sample notes.dat 56 17 Individual notes table3.dat 103 25 Redshifts, luminosities, and star formation rates of PAH sources
Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [HWL2007] Sequential number 4- 8 A5 --- --- [SST24] 10- 28 A19 --- SST24 Source name (JHHMMSS.ss+DDMMSS.s), in Simbad [HWL2007] SST24 JHHMMSS.ss+DDMMSS.s (1) 30- 37 I8 --- AOR ? AOR number (observation number in the Spitzer archive) 39- 47 A9 --- Prog Program number(s) 49- 51 I3 s expSL ? Total integration time in IRS Short-Low orders 1 and 2 53- 55 I3 s expLL ? Total integration time in IRS Long-Low orders 1 and 2 57- 61 F5.1 mJy F24um Flux at 24um (2) 62 A1 --- n_F24um [r] Note on F24um (3) 64- 67 F4.1 mJy F24um2 ? Flux at 24um measured independently from the extracted IRS spectra (2) 68 A1 --- f_F24um [g] Note on F24um (3) 69 A1 --- l_F70um Limit flag on 70um 70- 73 I4 mJy F70um ? Flux at 70um (4) 74 A1 --- u_F70um [?] Uncertainty flag on F70um 75 A1 --- n_F70um [r] Note on F70um (2) 77- 98 A22 --- Class Classification of IRS spectrum (5) 100 A1 --- n_Class [*] Note on Class, in notes.dat file
Note (1): SST24 source name derives from discovery with the MIPS 24um images; coordinates listed are J2000.0 24um positions with typical 3σ uncertainty of ±1.2". Note (2): Values of fν(24um) are for an unresolved point source measured from MIPS images, except that source noted by (r). The mean difference of ±4% between IRS and MIPS values gives an estimate of uncertainties in results Note (3): Notes as follows: g = Spiral galaxy and liner NGC 5656, with SDSS z=0.01055 r = sources resolved in the same galaxy in the 24um or 70um image, and the flux listed is the total flux for all components. Note (4): Values of fν(70um) are for an unresolved point source, measured from MIPS images; fluxes are uncertain for sources 13 and 14 because these are two closely interacting galaxies. Sources without measured fν(70um) are outside of the field of view for the 70um survey. Note (5): Classification of IRS spectrum, whether showing PAH emission, emission lines, absorption by the 9.7um Si feature, emission by the 9.7um silicate feature, or no features; numerical value gives classification according to scheme of Spoon et al. (2007ApJ...654L..49S)
Byte-by-byte Description of file: notes.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [HWL2007] Source number 4- 56 A53 --- Note Note
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- [HWL2007] Sequential number 4- 12 A9 --- Source Source name (HHMM+DDMM) (1) 14- 19 F6.4 --- z IRS redshift (3) 21- 26 F6.4 --- z2 ?=- SDSS redshift (2) 28- 42 A15 --- Class SDSS class 43- 46 I4 Mpc DL Luminosity distance 48- 51 F4.2 um EW6.2um Equivalent width at 6.2um (4) 53- 56 F4.2 um e_EW6.2um rms uncertainty on EW6.2um 58- 61 F4.1 mJy F7.7um Flux density at peak of 7.7um feature 63- 66 F4.1 mJy F7.7um2 Flux density at peak of 7.7um feature after subtraction of underlying continuum at 7.7um 68- 72 F5.2 [10-7W] log(nuLnu) Luminosity at 7.7um in source rest frame (5) 74- 78 F5.2 [solLum] log(LIR) Infrared luminosity 80- 85 F6.2 Msun/yr SFR Stellar formation rate (6) 87- 90 F4.2 Msun/yr SFR2 ? Second value of stellar formation rate (7) 92- 98 F7.4 10-5Mpc-3 Dens Space density (8) 100-103 F4.1 10-5Msun/yr/Mpc3 SFRdens Stellar formation rate density (9)
Note (1): Source name is truncated name from Table 1. Note (2): SDSS redshifts are from optical spectra. Note (3): IRS redshifts are determined from PAH emission features, assuming rest wavelengths of 6.2, 7.7, 8.6, and 11.3um; mean difference between SDSS and IRS redshifts of 0.0012 is estimate of uncertainty in IRS redshift. Note (4): Equivalent widths listed (EW) are in the observed frame; equivalent widths in the rest frame are EW/(1+z). Note (5): determined from peak flux density of 7.7um feature without continuum subtraction. Note (6): SFR for this source as determined from relation log(SFR)=log[nuLnu(7.7um)]-42.57. Note (7): SFR that would be derived using the f(Hα) for KISS sources and the relation log(SFR)=log[L(Hα)]-41.1, with no correction for extinction. Note (8): Space density for this source determined from inverse of comoving volume Vmax which source could occupy and remain within sample fν(24um)>10mJy; luminosity distances and comoving volumes determined by E.L. Wright, for H0=71km/s/Mpc, ΩM=0.27, and ΩΛ=0.73 (http://www.astro.ucla.edu/~wright/CosmoCalc.html) Note (9): SFR density produced by this source as determined from νLν(7.7um).
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Feb-2010
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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