J/ApJ/693/370 24um flux-limited sample of galaxies (Weedman+, 2009)
Average infrared galaxy spectra from Spitzer flux-limited samples.
Weedman D.W., Houck J.R.
<Astrophys. J., 693, 370-382 (2009)>
=2009ApJ...693..370W 2009ApJ...693..370W
ADC_Keywords: Active gal. nuclei ; Equivalent widths ; Photometry, infrared ;
Redshifts ; Spectra, infrared ; Galaxies, IR
Keywords: infrared: galaxies - galaxies: starburst - galaxies: active -
galaxies: distances and redshifts
Abstract:
The mid-infrared spectroscopic analysis of a flux-limited sample of
galaxies with fν(24um)>10mJy is presented. Sources observed are
taken from the Spitzer First Look Survey (FLS) catalog and from the
NOAO Deep Wide-Field Survey region in Bootes (NDWFS). The
spectroscopic sample includes 60 of the 100 sources in these combined
catalogs having fν(24um)>10 mJy. New spectra from the Spitzer
Infrared Spectrograph are presented for 25 FLS sources and for 11
Bootes active galactic nuclei (AGNs); these are combined with 24
Bootes starburst galaxies previously published to determine the
distribution of mid-infrared spectral characteristics for the total
10mJy sample. Sources have 0.01<z<2.4 and
41.8<logνLν(15um)<46.2(ergs/s).
Description:
In the point source catalog of the FLS (Fadda et al. 2006, Cat.
J/AJ/131/2859), there are 38 sources with fν(24um)>10mJy. Of
these, 13 are bright galactic stars. The remaining 25 sources have
been observed with the Spitzer/IRS (∼5 to ∼35um spectral range).
Characteristics and observational details of these 25 sources are
given in Table 1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 25 The >10mJy extragalactic point source sample in
the Spitzer First Look Survey (FLS)
table2.dat 83 36 PAH and [NeIII] fluxes for starbursts in FLS and
Bootes
table3.dat 66 36 Redshifts and continuum luminosities for
starbursts in FLS and Bootes
table4.dat 64 24 Spectral features for AGN in FLS and Bootes
table5.dat 74 24 Redshifts and continuum luminosities for AGN in
FLS and Bootes
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See also:
J/ApJ/701/1398 : SFR for starburst galaxies (Sargsyan+, 2009)
J/ApJ/686/127 : Starbursts luminosities based on PAH (Weedman+, 2008)
J/ApJ/671/323 : Spitzer Spectra of a 10mJy galaxy sample (Houck+, 2007)
J/AJ/131/2859 : Extragalactic First Look Survey: 24µm data (Fadda+, 2006)
J/ApJ/641/140 : Optical counterparts in the NDWFS Bootes field (Brand+, 2006)
J/ApJ/634/L1 : 16µm sources in the NOAO Bootes field (Kasliwal+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- [WH2009] Source number identification
4- 8 A5 --- --- [SST24]
10- 28 A19 --- SST24 Source name (JHHMMSS.ss+DDMMSS.s) (1)
30- 37 I8 --- AOR AOR number (2)
39- 43 I5 --- Prog Program number (2)
45- 48 F4.1 mJy Fnu Flux density at 24um from Spitzer/MIPS images
(4)(3)
50- 53 F4.1 mJy Fnu2 Flux density at 24um measured from Spitzer/IRS
spectra (4)
55- 69 A15 --- Remark Emission and absorption of IRS spectrum (5)
71- 72 A2 --- Class IRS classification (6)
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Note (1): SST24 source name derives from discovery with the MIPS 24um images;
coordinates listed are J2000 24um positions with typical 3σ
uncertainty of ±1.2".
Note (2): AOR number is the observation number in the Spitzer archive with the
program number which is given.
Note (3): Values of fν(24um) are for an unresolved point source in the FLS
measured from MIPS 24um images.
Note (4): Values are the fν(24um) measured independently using synthetic
photometry of the extracted IRS spectra; the mean difference between
IRS and MIPS values indicates that uncertainties in photometry are
less than ±5%.
Note (5): Classification of IRS spectrum, whether showing PAH emission,
absorption by the 9.7um silicate feature, or emission by the 9.7um
silicate feature. More data for PAH sources are in Tables 2 and 3 and
Figure 1; more data for silicate sources are in Tables 4 and 5 and
Figures 2-4.
Note (6): Classification according to scheme of Spoon et al.
(2007ApJ...654L..49S 2007ApJ...654L..49S): the galaxy spectra are classified into nine
different classes based on their 6.2um PAH EW and 9.7um silicate
strength. Class as follows:
1A = nearly featureless hot dust continuum with a very weak silicate
absorption feature at 9.7um (AGN-heated hot dust spectra).
1B = differs from the class 1A spectrum by clearly showing the family of PAH
emission features at 6.2, 7.7, 8.6, 11.2, 12.7, and 17.3um on top of a
hot dust continuum.
1C = hot dust continuum is nearly absent, allowing the PAH emission features
to dominate the mid-infrared spectral appearance (PAH-dominated
spectra).
2C = Silicate absorption at 9.7um becomes noticable as an increased depth of
the depression between the 6-9 and 11-13um PAH emission complexes (PAH
dominated spectra).
2B = the PAH features appear weaker than those in the class 2C spectrum. In
addition, the spectrum starts to show a 6um water ice and a 6.85um
aliphatic hydrocarbon absorption band.
3B = these absorption features reach their maximum depths, while the 9.7 and
18um silicate features continue to increase in depth up to class 3A.
3A = absorption-dominated spectra.
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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- 4 A4 --- [WH2009] Source identification (SBNN)
6- 7 I2 h RAh Hour of right ascension (J2000) (1)
8- 9 I2 min RAm Minute of right ascension (J2000) (1)
10- 14 F5.2 s RAs Second of right ascension (J2000) (1)
15 A1 --- DE- Declination sign (J2000) (1)
16- 17 I2 deg DEd Degree of declination (J2000) (1)
18- 19 I2 arcmin DEm Arcminute of declination (J2000) (1)
20- 23 F4.1 arcsec DEs Arcsecond of declination (J2000) (1)
25- 28 F4.1 mJy F7.7 Spitzer/IRS flux density at peak of 7.7um
PAH feature (2)
30 A1 --- f_F7.7 [f] differs from incorrect value in Weedman
and Houck (2008, Cat. J/ApJ/686/127)
32 A1 --- l_F6.2 Limit flag on F6.2
33- 38 F6.1 aW/m2 F6.2 Spitzer/IRS total flux of 6.2um PAH
emission feature, in 10-22W/cm2 (3)
40 A1 --- l_W6.2 Limit flag on W6.2
41- 44 F4.2 um W6.2 Equivalent width at 6.2um (3)
46- 49 F4.2 um e_W6.2 ? W6.2 uncertainty
51- 56 F6.1 aW/m2 F11.3 Spitzer/IRS total flux of 11.3um PAH
emission feature, in 10-22W/cm2 (4)
58- 61 F4.2 um W11.3 Equivalent width at 11.3um (4)
63- 66 F4.2 um e_W11.3 W11.3 uncertainty
68 A1 --- l_[NeIII] Limit flag on [NeIII]
69- 72 F4.1 aW/m2 [NeIII] Spitzer/IRS total flux of [NeIII] emission
feature at 15.56um, in 10-22W/cm2 (5)
74 A1 --- l_W15.56 Limit flag on W15.56
75- 78 F4.2 um W15.56 Equivalent width at 15.56um (5)
80- 83 F4.2 um e_W15.56 ? W15.56 uncertainty
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Note (1): Coordinates identify sources from Table 1 for FLS sources or from
Table 1 in Houck et al. (2007, cat. J/ApJ/671/323;
<[HWL2007] SST24 JHHMMSS.ss+DDMMSS.s> in Simbad) for Bootes sources.
Note (2): Used for normalizing spectra shown in Figure 1; values taken from
Houck et al. (2007, cat. J/ApJ/671/323) for Bootes sources.
Note (3): Fit with single gaussian on a linear continuum within rest wavelength
range 5.5um to 6.9um; uncertainties deriving from noise in the feature
and from flux calibration are typically ±10%. Values are from new
spectral extractions for FLS sources in Figure 1 and taken from Houck
et al. (2007, cat. J/ApJ/671/323) for Bootes sources, except that new
extractions were used for Bootes sources from the Spitzer public
archive in program 20113 (P.I.: H. Dole). Equivalent widths (EW) are
in the rest frame.
Note (4): Fit with single gaussian on a linear continuum within rest wavelength
range 10.4um to 12.2um; uncertainties deriving from noise in the
feature and from flux calibration are typically ±10%. Values are
from new spectral extractions for FLS sources in Figure 1 and taken
from Houck et al. (2007, cat. J/ApJ/671/323) for Bootes sources,
except that new extractions were used for Bootes sources from the
Spitzer public archive in program 20113. Equivalent widths (EW) are in
the rest frame.
Note (5): Fit with single gaussian on a linear continuum within rest wavelength
range 14.9um to 16.2um; uncertainties deriving from noise in the
feature and from flux calibration are typically ±10%. Values are
from new spectral extractions for FLS sources in Figure 1 and taken
from Houck et al. (2007, cat. J/ApJ/671/323) for Bootes sources,
except that new extractions were used for Bootes sources from the
Spitzer public archive in program 20113. Equivalent widths (EW) are in
the rest frame.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 4 A4 --- [WH2009] Source identification (SBNN)
6- 7 I2 h RAh Hour of right ascension (J2000) (1)
8- 9 I2 min RAm Minute of right ascension (J2000) (1)
10- 14 F5.2 s RAs Second of right ascension (J2000) (1)
15 A1 --- DE- Declination sign (J2000) (1)
16- 17 I2 deg DEd Degree of declination (J2000) (1)
18- 19 I2 arcmin DEm Arcminute of declination (J2000) (1)
20- 23 F4.1 arcsec DEs Arcsecond of declination (J2000) (1)
25- 30 F6.4 --- zIRS Redshift from IRS spectra
32- 37 F6.4 --- zSDSS ? Optical redshift from SDSS; as given by NED
(2)
39 A1 --- cl [SA] Spectral classification, as
S (Seyfert 2) or N (narrow-line AGN)
41- 44 F4.2 mJy F5.5 ? Spitzer/IRS continuum flux density at 5.5um
(4)
46- 49 F4.1 mJy F15 Spitzer/IRS continuum flux density at 15um (5)
51- 55 F5.2 [10-7W] nuLnu Rest-frame luminosity νLν at 15um
in ergs/s (log scale) (6)
57- 60 F4.2 --- F15/F7.7 Flux ratio between 15um and 7.7um
62- 66 F5.2 --- F24/F7.7 ? Flux ratio between 24um and 7.7um
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Note (1): Coordinates identify sources from Table 1 for FLS sources or from
Table 1 in Houck et al. (2007, cat. J/ApJ/671/323;
<[HWL2007] SST24 JHHMMSS.ss+DDMMSS.s> in Simbad) for Bootes sources.
Note (2): Optical redshift from SDSS as given in National Extragalactic Database
(NED) archive. All SDSS spectral classifications are as starburst
except those noted in f_zSDSS column.
Note (4): Measured as median flux between 5.0um and 6.0um; uncertainties are
typically ±5%, based on uncertainties in flux calibration.
Note (5): Measured as median flux between 14.8um and 15.2um; uncertainties are
typically ±5%, based on uncertainties in flux calibration.
Note (6): Determined using fν(15um) and luminosity distances from E. L.
Wright, http://www.astro.ucla.edu/~wright/CosmoCalc.html, for
H0=71km/s/Mpc, ΩM=0.27 and ΩΛ=0.73.
Log[νLν(15um)(L☉)]=log[νLν(15um)(ergs/s)]-33.59.
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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- 5 A5 --- [WH2009] Source identification (AGNNN)
7- 8 I2 h RAh Hour of right ascension (J2000) (1)
9- 10 I2 min RAm Minute of right ascension (J2000) (1)
11- 15 F5.2 s RAs Second of right ascension (J2000) (1)
16 A1 --- DE- Declination sign (J2000) (1)
17- 18 I2 deg DEd Degree of declination (J2000) (1)
19- 20 I2 arcmin DEm Arcminute of declination (J2000) (1)
21- 24 F4.1 arcsec DEs Arcsecond of declination (J2000) (1)
26 A1 --- l_F6.2 Limit flag on F6.2
27- 30 F4.1 aW/m2 F6.2 ? Spitzer/IRS total flux of 6.2um PAH
emission feature, in 10-22W/cm2 (2)
32 A1 --- l_W6.2 Limit flag on W6.2
33- 36 F4.2 um W6.2 ? Equivalent width at 6.2um (2)
38- 41 F4.2 um e_W6.2 ? W6.2 uncertainty
43 A1 --- l_[NeIII] Limit flag on [NeIII]
44- 47 F4.1 aW/m2 [NeIII] ? Total flux of [NeIII] emission feature (3)
49 A1 --- l_W15.56 Limit flag on W15.56
50- 53 F4.2 um W15.56 ? Equivalent width at 15.56um
55- 58 F4.2 um e_W15.56 ? W15.56 uncertainty
60- 64 A5 --- tau Optical depth (4)
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Note (1): Coordinates identify sources from Table 1 for FLS sources or from
Table 1 in Houck et al. (2007, cat. J/ApJ/671/323;
<[HWL2007] SST24 JHHMMSS.ss+DDMMSS.s> in Simbad) for Bootes sources.
Source 11 is also in Desai et al. (2006ApJ...641..133D 2006ApJ...641..133D).
Note (2): Fit with single gaussian on a linear continuum within rest wavelength
range 5.5um to 6.9um; uncertainties deriving from noise in the feature
and from flux calibration are typically ±10%. EW are in the rest
frame.
Note (3): Fit with single gaussian on a linear continuum within rest wavelength
range 14.9um to 16.2um; uncertainties deriving from noise in the
feature and from flux calibration are typically ±10%. EW are in the
rest frame.
Note (4): Optical depth τsi is measure of depth of 9.7um absorption
feature, defined as τsi=ln[fν(cont)/fν(abs)]
for fν(abs) measured at the maximum depth of absorption and
fν(cont) the unabsorbed continuum extrapolated from either side
of the absorption feature as in Spoon et al. (2007ApJ...654L..49S 2007ApJ...654L..49S).
Strength of silicate emission features is not measured because of
uncertainty in defining underlying continuum.
Log[νLν(15um)(L☉)]=log[νLν(15um)(ergs/s)]-33.59.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 A5 --- [WH2009] Source identification (AGNNN)
7- 8 I2 h RAh Hour of right ascension (J2000) (1)
9- 10 I2 min RAm Minute of right ascension (J2000) (1)
11- 15 F5.2 s RAs Second of right ascension (J2000) (1)
16 A1 --- DE- Declination sign (J2000) (1)
17- 18 I2 deg DEd Degree of declination (J2000) (1)
19- 20 I2 arcmin DEm Arcminute of declination (J2000) (1)
21- 24 F4.1 arcsec DEs Arcsecond of declination (J2000) (1)
26- 30 F5.3 --- zIRS ? Redshift from IRS spectra
31 A1 --- u_zIRS [?] Uncertainty flag on zIRS
33- 38 F6.4 --- z ? Optical redshift from SDSS; as given in NED
39 A1 --- u_z [?] Uncertainty flag on z
40- 41 A2 --- cl Class flag from SDSS; as given in NED (2)
42 A1 --- r_z [g] Redshift from Brown et al.
(2006ApJ...638...88B 2006ApJ...638...88B) using AGES survey
44- 48 F5.2 mJy F5.5 ? Spitzer/IRS continuum flux density at 5.5um (3)
50- 53 F4.1 mJy F8 ? Spitzer/IRS continuum flux density at 8um (4)
55- 59 F5.2 mJy F15 ? Spitzer/IRS continuum flux density at 15um (5)
61- 65 F5.2 [10-7W] nuLnu ? Rest frame luminosity νLν at 15um
in ergs/s (log scale) (6)
67- 70 F4.2 --- F15/F8 ? Flux ratio between 15um and 8um
72- 74 F3.1 --- F24/F8 ? Flux ratio between 24um and 8um
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Note (1): Coordinates identify sources from Table 1 for FLS sources or from
Table 1 in Houck et al. (2007, cat. J/ApJ/671/323;
<[HWL2007] SST24 JHHMMSS.ss+DDMMSS.s> in Simbad) for Bootes sources.
Note (2): Classification flags as follows:
S1 = Sy1
S2 = Sy2
Q = QSO
N = NLSy1 (narrow-line Seyfert)
L = Liner
A = AGN
Note (3): Measured as median flux between 5.0um and 6.0um; uncertainties are
typically ±5%, based on uncertainties in flux calibration.
Note (4): Used for normalizing spectra, as described in text.
Note (5): Measured as median flux between 14.8um and 15.2um; uncertainties are
typically ±5%, based on uncertainties in flux calibration.
Note (6): Determined using fν(15um) and luminosity distances from E.L.
Wright, http://www.astro.ucla.edu/~wright/CosmoCalc.html, for
H0=71km/s/Mpc, ΩM=0.27 and ΩΛ=0.73.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 21-Dec-2010