J/MNRAS/432/2182 FIR bright sources of M83 (Foyle+, 2013)
Star formation and dust heating in the FIR bright sources of M83.
Foyle K., Natale G., Wilson C.D., Popescu C.C., Baes M., Bendo G.J.,
Boquien M., Boselli A., Cooray A., Cormier D., De Looze I., Fischera J.,
Karczewski O.L., Lebouteiller V., Madden S., Pereira-Santaella M.,
Smith M.W.L., Spinoglio L., Tuffs R.J.
<Mon. Not. R. Astron. Soc., 432, 2182-2207 (2013)>
=2013MNRAS.432.2182F 2013MNRAS.432.2182F (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Infrared sources ; Photometry, infrared
Keywords: galaxies: individual: M83 - galaxies: ISM - galaxies: spiral
Abstract:
We investigate star formation and dust heating in the compact
far-infrared (FIR) bright sources detected in the Herschel maps
of M83. We use the source extraction code GETSOURCES to detect and
extract sources in the FIR, as well as their photometry in the
mid-infrared and Hα. By performing infrared spectral energy
distribution fitting and applying an Hα-based star formation
rate (SFR) calibration, we derive the dust masses and temperatures,
SFRs, gas masses and star formation efficiencies (SFEs). The detected
sources lie exclusively on the spiral arms and represent giant
molecular associations, with gas masses and sizes of 106-108M☉
and 200-300pc, respectively. The inferred parameters show little to no
radial dependence and there is only a weak correlation between the
SFRs and gas masses, which suggests that more massive clouds are less
efficient at forming stars. Dust heating is mainly due to local star
formation. However, although the sources are not optically thick, the
total intrinsic young stellar population luminosity can almost
completely account for the dust luminosity. This suggests that other
radiation sources also contribute to the dust heating and
approximately compensate for the unabsorbed fraction of UV light.
Description:
We use FIR images from the Herschel Space Observatory to trace cold
dust emission. We use 70 and 160um maps taken with the PACS
and 250 and 350um maps taken with the SPIRE.
We trace the warm dust and PAH emission using MIR maps taken from the
Spitzer Local Volume Legacy Survey (Dale et al., 2009ApJ...703..517D 2009ApJ...703..517D,
Cat. J/ApJ/703/517).
We use continuum-subtracted Hα maps from the Survey for
Ionization in Neutral Gas Galaxies (SINGG; Meurer et al.,
2006ApJS..165..307M 2006ApJS..165..307M, Cat. J/ApJS/165/307).
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tabled1.dat 103 90 High-background measurement source fluxes
and positions
tabled2.dat 67 90 HB measurement SED fitting parameters
tabled3.dat 104 90 Low-background measurement source fluxes
and positions
tabled4.dat 67 90 LB measurement SED fitting parameters
--------------------------------------------------------------------------------
See also:
J/A+A/578/A100 : Infrared massive stellar content of M83 (Williams+, 2015)
J/AJ/136/479 : IRAC observations of M83 extended UV disk (Dong+, 2008)
Byte-by-byte Description of file: tabled1.dat tabled3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 -- Seq Sequential number
4- 12 F9.5 deg RAdeg Right ascension (J2000)
14- 23 F10.6 deg DEdeg Declination (J2000)
25- 27 I3 mJy F8um Spitzer/IRAC flux at 8um
29- 32 F4.1 mJy e_F8um rms uncertainty on F8um
34- 38 F5.1 mJy F24um Flux at 24um
40- 43 F4.1 mJy e_F24um rms uncertainty on F24um
45- 49 F5.3 mJy F70um Herschel/PACS flux at 70um
51- 55 F5.3 mJy e_F70um rms uncertainty on F70um
57- 61 F5.3 mJy F160um Herschel/PACS flux at 160um
63- 67 F5.3 mJy e_F160um rms uncertainty on F160um
69- 73 F5.3 mJy F250um Herschel/SPIRE flux at 250um
75- 79 F5.3 mJy e_F250um rms uncertainty on F250um
81- 85 F5.3 mJy F350um ?=- Herschel/SPIRE flux at 350um
87- 91 F5.3 mJy e_F350um ? rms uncertainty on F350um
93- 98 F6.2 uJy F(Ha) ?=- Hα flux from SINGG (Meurer et al.,
2006, Cat. J/ApJS/165/307)
100-104 F5.2 uJy e_F(Ha) ? rms uncertainty on FHa
--------------------------------------------------------------------------------
Byte-by-byte Description of file: tabled2.dat tabled4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 --- Seq Sequential number
4- 7 F4.2 --- chiUV Intensity of the UV radiation field
9- 12 F4.2 --- e_chiUV rms uncertainty on chiUV
14- 16 F3.1 --- chicol Optical-to-UV ratio
18- 20 F3.1 --- e_chicol rms uncertainty on chicol
22- 26 F5.2 K Tdust Dust temperature
28- 31 F4.2 K e_Tdust rms uncertainty on Tdust
33- 36 F4.1 10+4Msun Mdust Dust mass of the diffuse component
38- 41 F4.1 10+4Msun e_Mdust rms uncertainty on Tdust
43- 46 F4.2 --- F24 Fraction of 24um emission provided by the
PDR component
48- 51 F4.2 --- e_F24 rms uncertainty on F24
53- 58 F6.2 10+33W Ldust Dust luminosity
60- 63 F4.2 10+33W e_Ldust rms uncertainty on Ldust
65- 67 F3.1 --- chi2FIT Fitted chi2 value
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 24-Jul-2015