J/ApJ/706/553 Fluxes in nearby star-forming galaxies (Boquien+, 2009)
Star-forming or starbursting? The ultraviolet conundrum.
Boquien M., Calzetti D., Kennicutt R., Dale D., Engelbracht C.,
Gordon K.D., Hong S., Lee J.C., Portouw J.
<Astrophys. J., 706, 553-570 (2009)>
=2009ApJ...706..553B 2009ApJ...706..553B
ADC_Keywords: Galaxies, nearby ; Photometry, infrared ; Abundances ;
Photometry, ultraviolet ; Photometry, UBVRI ; Photometry, H-alpha
Keywords: galaxies: spiral - infrared: galaxies - ultraviolet: galaxies
Abstract:
Compared to starburst galaxies, normal star-forming galaxies have been
shown to display a much larger dispersion of the dust attenuation at
fixed reddening through studies of the IRX-β diagram (the IR/UV
ratio "IRX" versus the UV color "β"). To investigate the causes
of this larger dispersion and attempt to isolate second parameters, we
have used GALEX UV, ground-based optical, and Spitzer infrared imaging
of eight nearby galaxies, and examined the properties of individual UV
and 24um selected star-forming regions. We concentrated on
star-forming regions, in order to isolate simpler star formation
histories than those that characterize whole galaxies.
Description:
The final sample consists of eight nearby star-forming galaxies. Their
SFRs range from 0.004M☉/yr/kpc2 to 0.046M_☉/yr/kpc2 with
an average of 0.020±0.021M_☉/yr/kpc2 calculated over the area
defined by R25.
We have obtained far- and near-ultraviolet processed count and
intensity maps from the GALEX archives.
Ground-based optical images consist of narrowband Hα
observations as well as broadband U, B, and R observations. Most
Hα and Spitzer images have been obtained from the Spitzer
Infrared Nearby Galaxies Survey (SINGS; Kennicutt et al.
2003PASP..115..928K 2003PASP..115..928K) archives.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 82 8 Galaxy parameters
table4.dat 139 324 Apertures positions and fluxes
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See also:
J/ApJS/192/6 : A GALEX UV imaging survey of nearby galaxies (Lee+, 2011)
J/ApJS/190/233 : Spectroscopy and abundances of SINGS galaxies (Moustakas+,
2010)
J/ApJS/178/247 : Hα and [NII] survey in local 11 Mpc (Kennicutt+, 2008)
J/ApJS/173/185 : GALEX ultraviolet atlas of nearby galaxies (Gil de Paz+,
2007)
J/A+A/446/839 : Hα surface photometry in nearby clusters (Gavazzi+,
2006)
J/ApJS/164/81 : Spectrophotometry of nearby galaxies (Moustakas+, 2006)
J/ApJ/630/784 : UBVR observations of nearby galaxies (Taylor+, 2005)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- --- [NGC]
5- 8 I04 --- NGC NGC number
10 A1 --- --- [M ]
12- 14 I3 --- M ? Messier number
16- 20 A5 --- MType Morphological type
22- 23 I2 h RAh NED Hour of right ascension (J2000)
25- 26 I2 min RAm NED Minute of right ascension (J2000)
28- 31 F4.1 s RAs NED Second of right ascension (J2000)
33 A1 --- DE- NED Sign of declination (J2000)
34- 35 I2 deg DEd NED Degree of declination (J2000)
37- 38 I2 arcmin DEm NED Arcminute of declination (J2000)
40- 41 I2 arcsec DEs NED Arcsecond of declination (J2000)
43- 46 F4.2 Mpc Dist Distance
48- 50 I3 deg PA Position angle (1)
52- 55 F4.1 arcmin amaj NED Major axis
57- 60 F4.1 arcmin bmin NED Minor axis
62- 66 F5.2 arcmin rho25 Radius of the major axis at the
µB=25mag/arcsec2 isophote (2)
68- 71 F4.2 [-] [O/H] Oxygen abundance (12+logO/H (rho=0)) (2)
73- 77 F5.2 [-] D[O/H] O/H gradient normalized to rho25
(Δ[O/H] in dex/ρ25) (2)
79- 82 F4.2 --- [NII]/Ha ? The mean [NII]/[Hα] ratio (3)
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Note (1): The position angle is calculated manually adjusting an ellipse
to the galaxy in the R-band image (if available).
Note (2): Data obtained from Zaritsky et al. (1994ApJ...420...87Z 1994ApJ...420...87Z) and
Moustakas et al. (2010, Cat. J/ApJS/190/233).
Note (3): The measured fluxes have been corrected for contamination by the
[NII] lines accordingly. As no spectrum was available for the
high-metallicity galaxy NGC 5236, we have assumed [NII]/[Hα]=0.5,
close to 0.53 found by Kennicutt et al. (2008, Cat. J/ApJS/178/247).
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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- 13 A13 --- [BCK2009b] Identification (NGC NNNN-[U/I]-NN) (1)
15- 16 I2 h RAh Hour of Right Ascension (J2000) (2)
18- 19 I2 min RAm Minute of Right Ascension (J2000) (2)
21- 24 F4.1 s RAs Second of Right Ascension (J2000) (2)
26 A1 --- DE- Sign of the Declination (J2000) (2)
27- 28 I2 deg DEd Degree of Declination (J2000) (2)
30- 31 I2 arcmin DEm Arcminute of Declination (J2000) (2)
33- 34 I2 arcsec DEs Arcsecond of Declination (J2000) (2)
36- 39 F4.2 mJy FFUV Far ultraviolet band flux density (3)
41- 44 F4.2 mJy e_FFUV Uncertainty in FUV
46- 50 F5.2 mJy FNUV Near ultraviolet band flux density (3)
52- 55 F4.2 mJy e_FNUV Uncertainty in NUV
57- 61 F5.2 mJy FU U band flux density (3)
63- 66 F4.2 mJy e_FU Uncertainty in U
68- 72 F5.2 mJy FB B band flux density (3)
74- 77 F4.2 mJy e_FB Uncertainty in B
79- 84 F6.2 mJy FR ?=-99.99 R band flux density (3)
86- 91 F6.2 mJy e_FR ?=-99.99 Uncertainty in R
93- 98 F6.2 mJy F8 Aperture corrected 8um band flux density (4)
100-104 F5.2 mJy e_F8 Uncertainty in F8
106-113 F8.3 mJy F24 Aperture corrected 24um band flux density (4)
115-120 F6.2 mJy e_F24 Uncertainty in F24
122-127 F6.2 10-17W/m2/s Ha ?=-99.99 Hα flux (3)
129-134 F6.2 10-17W/m2/s e_Ha ?=-99.99 Uncertainty in Ha
136-139 F4.1 arcsec Re Effective radius
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Note (1): Format: names of the galaxy-band of selection-number. U
(respectively I) indicates that the aperture has been defined from the
FUV (resp. 24 micron) image.
Note (2): Position of the barycenter of the apertures.
Note (3): Stellar and ionized gas fluxes have been corrected for the
Galactic foreground extinction using the Cardelli et al.
(1989ApJ...345..245C 1989ApJ...345..245C) law.
Note (4): Stellar emission in the 8 micron band has been subtracted using
the relation presented in Helou et al. (2004ApJS..154..253H 2004ApJS..154..253H):
Fν(8PAH)=Fν(8)-0.232xFν(3.6).
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 13-Dec-2011