J/ApJ/715/506 Aromatic inventory of the local volume (Marble+, 2010)
An aromatic inventory of the local volume.
Marble A.R., Engelbracht C.W., van Zee L., Dale D.A., Smith J.D.T.,
Gordon K.D., Wu Y., Lee J.C., Kennicutt R.C., Skillman E.D., Johnson L.C.,
Block M., Calzetti D., Cohen S.A., Lee H., Schuster M.D.
<Astrophys. J., 715, 506-540 (2010)>
=2010ApJ...715..506M 2010ApJ...715..506M
ADC_Keywords: Galaxies, IR ; Galaxies, nearby ; Abundances ;
Photometry, infrared
Keywords: galaxies: ISM - infrared: galaxies - surveys - techniques: photometric
Abstract:
Using infrared photometry from the Spitzer Space Telescope, we perform
the first inventory of aromatic feature emission (also commonly
referred to as polycyclic aromatic hydrocarbon emission) for a
statistically complete sample of star-forming galaxies in the local
volume. The photometric methodology involved is calibrated and
demonstrated to recover the aromatic fraction of the Infrared Array
Camera 8um flux with a standard deviation of 6% for a training set of
40 SINGS galaxies (ranging from stellar to dust dominated; Kennicutt
et al. 2003PASP..115..928K 2003PASP..115..928K) with both suitable mid-infrared Spitzer
Infrared Spectrograph spectra and equivalent photometry. A potential
factor of 2 improvement could be realized with suitable 5.5um and 10um
photometry, such as what may be provided in the future by the James
Webb Space Telescope. The resulting technique is then applied to
mid-infrared photometry for the 258 galaxies from the Local Volume
Legacy (LVL; Dale et al. 2009, Cat. J/ApJ/703/517) survey, a large
sample dominated in number by low-luminosity dwarf galaxies for which
obtaining comparable mid-infrared spectroscopy is not feasible. Using
oxygen abundances compiled from the literature for 129 of the 258 LVL
galaxies, we find a correlation between metallicity and the
aromatic-to-total infrared emission ratio but not the
aromatic-to-total 8um dust emission ratio. A possible explanation is
that metallicity plays a role in the abundance of aromatic molecules
relative to the total dust content, but other factors, such as star
formation and/or the local radiation field, affect the excitation of
those molecules.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 114 283 Local Volume Legacy (LVL) and SINGS galaxies
table3.dat 142 258 Local Volume Legacy (LVL) photometric data
refs.dat 97 143 References
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See also:
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/ApJS/190/233 : Spectroscopy and abundances of SINGS galaxies (Moustakas+,
2010)
J/ApJ/703/517 : The Spitzer Local Volume Legacy (LVL) (Dale+, 2009)
J/ApJ/701/1965 : Radial dust properties of SINGS galaxies (Munoz-Mateos+,
2009)
J/ApJ/656/770 : Mid-IR spectrum of star-forming galaxies (Smith+, 2007)
J/AJ/133/715 : Dwarf galaxies of the Local Group (Whiting+, 2007)
J/ApJS/164/81 : Spectrophotometry of nearby galaxies (Moustakas+, 2006)
J/A+A/448/955 : Abundances of emission galaxies in SDSS-DR3 (Izotov+, 2006)
J/PASP/117/227 : Properties of 101 galaxies from the NFGS (Kewley+, 2005)
J/ApJS/153/429 : SDSS strong emission line HII galaxies (Kniazev+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Galaxy name
16- 17 I2 h RAh Hour of Right Ascension (J2000)
19- 20 I2 min RAm Minute of Right Ascension (J2000)
22- 25 F4.1 s RAs Second of Right Ascension (J2000)
27 A1 --- DE- Sign of the Declination (J2000)
28- 29 I2 deg DEd Degree of Declination (J2000)
31- 32 I2 arcmin DEm Arcminute of Declination (J2000)
34- 35 I2 arcsec DEs Arcsecond of Declination (J2000)
37- 38 I2 --- Ref Coordinate reference (see refs.dat file)
40- 43 I4 km/s cz ? Heliocentric redshift
45 A1 --- f_cz [b] Problem on cz (1)
47- 51 F5.2 Mpc Dist Distance
53- 57 A5 --- r_Dist Reference(s) for Dist (see refs.dat file)
59- 62 F4.2 [-] logO ? Oxygen abundance; 12+log10(O/H)
64- 67 F4.2 [-] e_logO ? Uncertainty in logO
69 A1 --- f_logO [c] unreliable Oxygen abundance (1)
71- 82 A12 --- n_logO Method used to determine logO (2)
84-110 A27 --- r_logO Reference(s) for logO (see refs.dat file)
112 A1 --- LVL Membership in LVL subsample (Dale et al. 2009,
Cat. J/ApJ/703/517); X = yes
114 A1 --- IRS Membership in IRS subsample (Smith et al.
2007, Cat. J/ApJ/656/770); X = yes
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Note (1): Flag as follows:
b = This velocity is erroneously listed as 869 instead of 1469 in
Dale et al. (2009, Cat. J/ApJ/703/517).
c = This oxygen abundance is believed to be affected by tidal
interaction in the M81 group and unrepresentative of the galaxy
(Croxall et al. 2009ApJ...705..723C 2009ApJ...705..723C).
Note (2): The oxygen abundances drawn from the literature are based on either
the 4363Å line, the strong line method, a mix of these two methods,
or, in one case, a planetary nebula (PN) observation.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Galaxy name
16 A1 --- f_Name [c] Flag on name (1)
18 A1 --- l_F8.0 Limit flag on F8.0
19- 25 E7.2 mJy F8.0 ? IRAC 8.0 micron band flux density (2)
27- 33 E7.2 mJy e_F8.0 ? Uncertainty in F8.0
35- 41 E7.2 mJy F4.5s ? Stellar contribution to Spitzer/IRAC 4.5
micron band (3)
43- 49 E7.2 mJy F5.8s ? Stellar contribution to Spitzer/IRAC 5.8
micron band (3)
51 A1 --- l_F8.0s Limit flag on F8.0s
52- 58 E7.2 mJy F8.0s ? Stellar contribution to Spitzer/IRAC 8
micron band (3)
60- 66 E7.2 mJy e_F8.0s ? Uncertainty in F8.0s
68- 74 E7.2 mJy F24s ? Stellar contribution to Spitzer/MIPS 24
micron band (3)
76 A1 --- l_F8d Limit flag on F8d
77- 83 E7.2 mJy F8d ? Dust continuum contribution to Spitzer/IRAC
8 micron band
85- 91 E7.2 mJy e_F8d ? Uncertainty in F8d
93 A1 --- l_F8a Limit flag on F8a
94-100 E7.2 mJy F8a ? The 8 micron aromatic feature complex
contribution to Spitzer/IRAC 8 micron band
102-108 E7.2 mJy e_F8a ? Uncertainty in F8a
110 A1 --- l_F8i Limit flag on F8i
111-117 E7.2 fW/m2 F8i ? Integrated aromatic emission for 8
micron complex (in 10-12erg/cm2/s)
119-125 E7.2 fW/m2 e_F8i ? Uncertainty in F8i
127 A1 --- l_F.IR Limit flag on F.IR
128-134 E7.2 fW/m2 F.IR ? Total 3-1100 micron flux
(in units of 10-12erg/cm2/s)
136-142 E7.2 fW/m2 e_F.IR ? Uncertainty in F.IR
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Note (1):
c = The NGC 1800 entry is the combined photometry of that galaxy and
MCG -05-13-004 (which spatially overlap).
Note (2): Photometry for the other Spitzer bands can be found in the LVL
survey description and infrared photometry paper (Dale et al. 2009,
Cat. J/ApJ/703/517).
Note (3): The uncertainties in the synthetic stellar photometry are the
propagated uncertainties in the IRAC 3.6 micron photometry, thus
the uncertainty in FXs is simply the provided uncertainty in F8s
multiplied by the ratio of FXs/F8s.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Ref Reference code
5- 23 A19 --- BibCode Bibcode
25- 48 A24 --- Aut Author's name(s)
50- 97 A48 --- Comm Comment
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 14-May-2012