J/A+A/608/A127 Breaks in disc galaxy abundance gradients (Pilyugin+, 2017)
Breaks in surface brightness profiles and radial abundance gradients in the
discs of spiral galaxies.
Pilyugin L.S., Grebel E.K., Zinchenko I.A., Nefedyev Y.A., Vilchez J.M.
<Astron. Astrophys. 608, A127 (2017)>
=2017A&A...608A.127P 2017A&A...608A.127P (SIMBAD/NED BibCode)
ADC_Keywords: Galaxy catalogs ; Interstellar medium ; Abundances
Keywords: ISM: abundances - galaxies: abundances - galaxies: spiral -
galaxies: structure
Abstract:
We examine the relation between breaks in the surface brightness
profiles and radial abundance gradients within the optical radius in
the discs of 134 spiral galaxies from the CALIFA survey. The
distribution of the radial abundance (in logarithmic scale) in each
galaxy was fitted by simple and broken linear relations. The surface
brightness profile was fitted assuming pure and broken exponents for
the disc. We find that the maximum absolute difference between the
abundances in a disc given by broken and pure linear relations is less
than 0.05dex in the majority of our galaxies and exceeds the scatter
in abundances for 26 out of 134 galaxies considered. The scatter in
abundances around the broken linear relation is close (within a few
percent) to that around the pure linear relation. The breaks in the
surface brightness profiles are more prominent. The scatter around the
broken exponent in a number of galaxies is lower by a factor of two or
more than that around the pure exponent. The shapes of the abundance
gradients and surface brightness profiles within the optical radius in
a galaxy may be different. A pure exponential surface brightness
profile may be accompanied by a broken abundance gradient and vise
versa. There is no correlation between the break radii of the
abundance gradients and surface brightness profiles. Thus, a break in
the surface brightness profile does not need to be accompanied by a
break in the abundance gradient.
Description:
We constructed maps of the oxygen abundance in the discs of 134 spiral
galaxies using the 2D spectroscopy of the DR3 of the CALIFA survey.
Table 1 reports the adopted and derived parameter of galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 259 134 Parameters of the sample galaxies
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See also:
J/A+A/576/A135 : CALIFA DR2 (Garcia-Benito+, 2015)
J/A+A/584/A87 : CALIFA sample SFR calibration (Catalan-Torrecilla+, 2015)
J/A+A/585/A47 : CALIFA color/metallicity gradients connections (Marino+, 2016)
J/A+A/587/A70 : CALIFA face-on spiral gal. oxygen (Sanchez-Menguiano+, 2016)
J/A+A/595/A62 : CALIFA galaxies O/H and N/O slopes (Perez-Montero+, 2016)
J/A+A/597/A48 : Stellar kinematics in CALIFA survey (Falcon-Barroso+, 2017)
J/A+A/598/A32 : 2D decomposition of CALIFA galaxies (Mendez-Abreu+, 2017)
J/A+A/604/A4 : CALIFA galaxies observational hints (Ruiz-Lara+, 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Name NED name of the galaxy
13- 16 A4 --- Mtype morphological type of galaxy
17- 20 F4.1 --- Tcode morphological T code
21- 31 F11.6 deg RAdeg Right ascension (J2000.0)
32- 42 F11.6 deg DEdeg Declination (J2000.0)
43- 48 F6.1 deg i Inclination angle
49- 54 F6.1 deg PA Position angle of major axis
55- 60 F6.1 Mpc d Distance
61- 65 F5.2 arcmin R25min Optical radius R25 in arcmin
66- 71 F6.2 kpc R25kpc Optical radius R25 in kpc
72- 77 F6.3 --- OHo Central oxygen abundance at linear relation
78- 83 F6.3 --- e_OHo Error of OHo
84- 90 F7.3 --- grad Abundance gradient at linear relation
(in dex/R25 unit)
91- 96 F6.3 --- e_grad Error of grad (in dex/R25 unit)
97-103 F7.4 --- sigmaOHp Scatter in abundance around linear relation
104-108 I5 --- n Number of abundance data points
109-114 F6.3 --- b1 OHo of inner part of broken linear relation
115-120 F6.3 --- e_b1 Error in b1
121-127 F7.3 --- a1 Abundance gradient of inner part of broken
linear relation (in dex/R25 unit)
128-133 F6.3 --- e_a1 Error in a1 (in dex/R25 unit)
134-139 F6.3 --- b2 OHo of outer part of broken linear relation
140-145 F6.3 --- e_b2 Error in b2
146-152 F7.3 --- a2 Abundance gradient of outer part of broken
linear relation (in dex/R25 unit)
153-158 F6.3 --- e_a2 Error in a2 (in dex/R25 unit)
159-163 F5.2 --- RbOH Break radius in broken linear relation
(in R25 unit)
164-170 F7.4 --- sigmaOHb Scatter in abundance around broken linear
relation (in dex)
171-177 F7.1 Lsun/pc2 SRep Bulge surface brightness at effective radius
in pure exponential
178-182 F5.2 kpc Rep Effective radius in pure exponential
183-186 F4.1 --- np Shape parameter in pure exponential
187-193 F7.1 Lsun/pc2 Sdop Central disc surface brightness in
pure exponential
194-199 F6.2 kpc hp Disc scale length in pure exponential
200-205 F6.3 --- sigmaSBp Scatter in surface brightness around
pure exponential
206-212 F7.1 Lsun/pc2 SReb Bulge surface brightness at effective
radius in broken exponential
213-217 F5.2 kpc Reb Effective radius in broken exponential
218-221 F4.1 --- nb Shape parameter in broken exponential
222-228 F7.1 Lsun/pc2 Sdob1 Central surface brightness of the
inner disc in broken exponential
229-234 F6.2 kpc hb1 Inner disc scale length in broken exponential
235-241 F7.1 Lsun/pc2 Sdob2 Central surface brightness of the
outer disc in broken exponential
242-247 F6.2 kpc hb2 Outer disc scale length in broken exponential
248-253 F6.2 kpc RbSB Break radius in broken exponential
254-259 F6.3 --- sigmaSBb Scatter in surface brightness around
broken exponential
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Acknowledgements:
Leonid Pilyugin, pil620a(at)gmail.com
References:
CALIFA, the Calar Alto Legacy Integral Field Area survey:
Sanchez et al., Paper I, 2012A&A...538A...8S 2012A&A...538A...8S
Husemann et al. Paper II 2013A&A...549A..87H 2013A&A...549A..87H
Garcia-Benito et al., Paper III 2015A&A...576A.135G 2015A&A...576A.135G, Cat. J/A+A/576/A135
Sanchez et al., Paper IV 2016A&A...594A..36S 2016A&A...594A..36S
(End) Patricia Vannier [CDS] 11-Oct-2017