J/A+A/521/A8 Star-forming regions in NGC 2903 bar (Popping+, 2010)
Multiwavelength study of the star-formation in the bar of NGC 2903.
Popping G., Perez I., Zurita A.
<Astron. Astrophys., 521, A8-8 (2010)>
=2010A&A...521A...8P 2010A&A...521A...8P
ADC_Keywords: Galaxies, photometry ; H II regions ; Ultraviolet ;
Equivalent widths
Keywords: galaxies: star formation - galaxies: structure -
galaxies: individual: NGC 2903 - galaxies: evolution - HII regions -
ultraviolet: galaxies
Abstract:
The nearby barred spiral NGC 2903 has an active starburst at its
centre and HII regions distributed along its bar. We analyse the
star-formation properties in the bar region of NGC 2903 and study its
links to the typical bar morphological features.
We combine space and ground-based data from the far-ultraviolet to the
sub-millimeter spectral ranges to create a panchromatic view of the
NGC 2903 bar. We produce two catalogues: one for the current
star-formation regions, as traced by the Hα compact emission,
and a second for the ultraviolet (UV) emitting knots, containing
positions and luminosities. From them, we obtain ultraviolet colours,
star-formation rates, dust attenuation, and Hα EWs, and
analyse their spatial distribution. We estimate stellar cluster ages
using stellar population synthesis models (Starburst99).
Description:
To investigate the extinction and the star-formation in the bar of NGC
2903 we used the Spitzer 24um observations from the Multiband Imaging
Photometer (MIPS) instrument.
To analyse the UV emission and its distribution in NGC 2903, we used
GALEX mission data.
Ground-based optical images from the Sloan Digital Sky Survey (SDSS)
and a map of the CO (J=1-0) rotational transition emission were also
used for the morphological analysis of NGC 2903.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 83 67 HII region catalogue of the bar zone of NGC 2903
table3.dat 86 56 Summary of positions and photometry of the
star-forming knots
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See also:
J/MNRAS/396/2295 : Stellar cluster dynamical masses in NGC2903 (Hagele+, 2009)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- HII [1/67] Sequential number of catalogued HII
region, <[PPZ2010] HII NN> in Simbad
4- 5 I2 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 14 F5.2 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 27 F5.2 arcsec DEs Declination (J2000)
29- 32 F4.2 arcsec Rad HII region radius
34- 37 F4.2 --- Ecc Eccentricity of the integration apertures
39- 41 I3 deg PA [-90/160] Position angle (measured
North-West) of the integration apertures
43- 47 F5.2 [10-7W] logLHa Decimal logarithm of the Hα+[NII]
luminosity (1)
49- 52 F4.2 [10-7W] e_logLHa rms uncertainty on logLHa
54- 57 F4.2 [0.1nm] logEW ?=- Decimal logarithm of the Hα+[NII]
equivalent width (1)
59- 62 F4.2 [0.1nm] e_logEW ?=- rms uncertainty on logEW
64- 68 F5.2 [10-7W] logL24 Decimal logarithm of the 24um emission
within the HII region apertures (1)
70- 73 F4.2 mag AHa Hα attenuation (see Sect. 4.3) (1)
75- 79 F5.1 mMsun/yr SFR Estimate of the current star-formation rate
for each catalogued HII region (2)
81- 83 F3.1 mMsun/yr e_SFR rms uncertainty on SFR
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Note (1): Include the corresponding correction for Galactic extinction
(Schlegel et al. 1998ApJ...500..525S 1998ApJ...500..525S).
Not corrected for internal dust extinction
Note (2): The SFRs were obtained after applying a correction of 25% for
[NII] contamination to the Hα luminosities and dust extinction
as given in AHa.
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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- 2 I2 --- Knot [1/56] ID of the region,
<[PPZ2010] knot NN> in Simbad
4- 5 I2 h RAh Right ascension (J2000)
7- 8 I2 min RAm Right ascension (J2000)
10- 14 F5.2 s RAs Right ascension (J2000)
16 A1 --- DE- Declination sign (J2000)
17- 18 I2 deg DEd Declination (J2000)
20- 21 I2 arcmin DEm Declination (J2000)
23- 27 F5.2 arcsec DEs Declination (J2000)
29 A1 --- l_logLHa Limit flag on logLHa (upper limit)
30- 34 F5.2 [10-7W] logLHa Decimal logarithm of the Hα
luminosity (1) (2)
36 A1 --- l_logL24 Limit flag on logL24 (upper limit)
37- 41 F5.2 [10-7W] logL24 Decimal logarithm of the 24um luminosity (1)
43- 47 F5.2 [10-7W] logLFUV Decimal logarithm of the FUV luminosity (1)
49- 53 F5.2 [10-7W] logLNUV Decimal logarithm of the NUV luminosity (1)
55- 58 F4.2 mag AHa Estimated Hα attenuation
(see Sect. 4.3)
60- 64 F5.2 mag FUV FUV attenuation-corrected magnitude
66- 70 F5.2 mag NUV NUV attenuation-corrected magnitude
72- 76 F5.2 mag F-N FUV-NUV colour index
78- 86 A9 --- HII ID number(s) of the HII region catalogue,
which matches the UV emitting knot
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Note (1): these values have not been corrected for extinction.
Note (2): Hα luminosity corrected for a 25% [NII] contamination.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 29-May-2012