J/MNRAS/412/1741 Spectroscopic obs. of 3 spiral galaxies (Scarano+, 2011)
Breaks in the radial oxygen abundance and corotation radius of three spiral
galaxies.
Scarano S.Jr, Lepine J.R.D., Marcon-Uchida M.M.
<Mon. Not. R. Astron. Soc., 412, 1741-1754 (2011)>
=2011MNRAS.412.1741S 2011MNRAS.412.1741S
ADC_Keywords: Galaxies, spectra ; Radial velocities ; Velocity dispersion
Keywords: galaxies: abundances - galaxies: fundamental parameters -
galaxies: ISM - galaxies: spiral - galaxies: star formation
Abstract:
The correlation between the breaks in the metallicity distribution and
the corotation radius of spiral galaxies has been already advocated in
the past and is predicted by a chemodynamical model of our Galaxy that
effectively introduces the role of spiral arms in the star formation
rate. In this work, we present photometric and spectroscopic
observations made with the Gemini Telescope for three of the best
candidates of spiral galaxies to have the corotation inside the
optical disc: IC 0167, NGC 1042 and NGC 6907. We observed the most
intense and well-distributed HII regions of these galaxies, deriving
reliable galactocentric distances and oxygen abundances by applying
different statistical methods. From these results, we confirm the
presence of variations in the gradients of metallicity of these
galaxies that are possibly correlated with the corotation resonance.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 54 37 Information about the spectra observed for
IC0167 in 2005
tablea2.dat 54 54 Information about the spectra observed for
IC0167 in 2006
tablea4.dat 54 38 Information about the spectra observed for
NGC1042 in 2005
tablea5.dat 54 71 Information about the spectra observed for
NGC1042 in 2006
tablea7.dat 54 39 Information about the spectra observed for
NGC6907 in 2005
tablea8.dat 54 61 Information about the spectra observed for
NGC6907 in 2006
cross.dat 21 75 Correspondences between the slits observed in
2006 and the slits observed in 2005
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Byte-by-byte Description of file: tablea[124578].dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Sequential number within the cluster
3 A1 --- n_Seq [*] unexplained note
5- 13 F9.5 deg RAdeg Right ascension in decimal degrees (J2000)
15- 23 F9.5 deg DEdeg Declination in decimal degrees (J2000)
25- 28 F4.1 arcsec Dy Spectrum height
30- 32 I3 arcsec r Face-on polar coordinate, r
34- 37 I4 deg theta [-180/180] Face-on polar coordinate, θ
39- 44 I6 km/s Vobs ?=- Cross-correlated velocity evaluated from
the observed spectra
46- 48 I3 km/s sigma ?=- Velocity dispersion
50- 51 I2 --- nus ?=- Number of lines effectively used on the
calculations
53- 54 I2 --- nlin ?=- Number of lines detected
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Byte-by-byte Description of file: cross.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Gal Galaxy name
9- 10 I2 --- ID06 ID number in 2006 observations table
12- 13 I2 --- ID05 ID number in 2005 observations table
14- 21 A8 --- n_ID05 Note
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 27-Oct-2011