J/other/AstBu/69.247 Galaxies in Lynx-Cancer void (Perepelitsyna+, 2014)
Study of galaxies in the Lynx-Cancer void. IV. Photometrical properties.
Perepelitsyna Y.A., Pustilnik S.A., Kniazev A.Y.
<Astrophys. Bull., 69.247 (2014)>
=2014AstBu..69..247P 2014AstBu..69..247P
ADC_Keywords: Galaxies, photometry ; Fundamental catalog ; Photometry, ugriz
Keywords: galaxies: photometry - galaxies: fundamental parameters -
galaxies: evolution -
Abstract:
In this work we present the results of photometrical study of 85
objects from the updated sample of galaxies residing in the nearby
Lynx-Cancer void. The images in filters u,g,r,i from the Sloan Digital
Sky Survey database are used for photometry. The following
model-independent parameters are obtained: integrated magnitudes and
colours, effective radii and the respective surface brightnesses,
optical and Holmberg radii. On results of the radial surface
brightness profile analysis, their central values and scalelengths of
model discs are derived. The colours of the outer parts of void
galaxies are examined and compared to those of the model evolutionary
tracks of the PEGASE2 package. This allowed to obtain estimates of the
time since the epoch of star formation TSF. Among the latter group,
the low-luminosity objects with MB>-13.2 dominate. The derived
integrated absolute magnitudes and colours are used for galaxy stellar
mass estimates. All available data on integrated galaxy HI fluxes are
used to derive their parameter M(HI)/LB and to estimate their gas
mass-fraction. The small ∼10% subgroup of the most gas-rich galaxies,
with M(HI)/LB>2.5, shows gas mass-fractions reaching (94-99)%.
Many of these objects also show atypically blue colours of their outer
parts. To check possible statistical differences of void galaxy
properties and galaxy samples formed with more general criteria, we
compared the void sample galaxy parameters with those of 195 galaxies
from the Equatorial Survey (ES), formed as a part of the blind HI
survey HIPASS. In the common luminosity range (-18.5<Mg←13.5)
the compared samples show similarity. The lowest luminosity void
galaxies differ from the main ES sample. However, there are also ∼7%
faint so called 'inchoate' galaxies among ES sample with the elevated
parameter M(HI)/LB, majority of which are situated far from massive
neighbours and are probably the analogs of void galaxies.
Description:
We present the results of photometrical study of 85 objects from the
updated sample of galaxies residing in the nearby Lynx-Cancer void.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
lc_photo.dat 222 85 Photometric parameters of galaxies Lynx-Cancer void
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See also:
J/MNRAS/415/1188 : Galaxies in the Lynx-Cancer void (Pustilnik+, 2011)
Byte-by-byte Description of file: lc_photo.dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- Name Galaxy name (1)
16- 17 I2 h RAh Right ascension (J2000)
18- 19 I2 min RAm Right ascension (J2000)
20- 24 F5.2 s RAs Right ascension (J2000)
25 A1 --- DE- Declination sign (J2000)
26- 27 I2 deg DEd Declination (J2000)
28- 29 I2 arcmin DEm Declination (J2000)
30- 33 F4.1 arcsec DEs Declination (J2000)
35- 38 F4.1 arcsec R50(g) Radius of the galaxy that encompass 50%
of the total flux in g filter
40- 44 F5.1 arcsec R90(g) Radius of the galaxy that encompass 90%
of the total flux in g filter
46- 49 F4.1 mag/arcsec2 mueff(g) Effective surface brightness in g filter
51- 55 F5.1 arcsec R25(g) Optical radius in seconds of arc in the
filter g
57- 59 F3.1 kpc a25(g) Optical radius in kpc in filter g
61- 64 F4.1 mag g25 Magnitude in the filter g inside the
optical radius
66- 70 F5.1 arcsec R26.5(g) Holmberg radius
72- 75 F4.1 mag g26.5 Magnitude in the filter g inside the
Holmberg radius
77- 81 F5.1 arcsec a Optical semi-major axis (arcsec)
83- 86 F4.1 arcsec b Optical semi-minor axis (arcsec)
88- 90 F3.1 kpc a(kpc) Optical semi-major axis (kpc)
92- 94 F3.1 kpc b(kpc) Optical semi-minor axis (kpc)
96-100 F5.2 mag gtot Total (integrated) magnitude in g filter
102-105 F4.2 mag e_gtot Error on gtot
107-110 F4.2 mag (u-g)tot Integrated colours (u-g)
112-115 F4.2 mag e_(u-g)tot Error on (u-g)tot
117-121 F5.2 mag (g-r)tot Integrated colours (g-r)
123-126 F4.2 mag e_(g-r)tot Error on (g-r)tot
128-132 F5.2 mag (r-i)tot Integrated colours (r-i)
134-137 F4.2 mag e_(r-i)tot Error on (r-i)tot
139-142 F4.2 mag (u-g)per ? The colours (u-g) of the outer parts
of galaxies
144-147 F4.2 mag e_(u-g)per ? Error on (u-g)per
149-152 F4.2 mag (g-r)per ? The colours (g-r) of the outer parts
of galaxies
154-157 F4.2 mag e_(g-r)per ? Error on (g-r)per
159-162 F4.2 mag (r-i)per ? The colours (r-i) of the outer parts
of galaxies
164-167 F4.2 mag e_(r-i)per ? Error on (r-i)per
169-173 F5.2 mag/arcsec2 mu0(g) Central surface brightness in g filter
175-178 F4.2 mag/arcsec2 e_mu0(g) Error on mu0(g)
180-184 F5.2 mag/arcsec2 mu0(r) Central surface brightness in r filter
186-189 F4.2 mag/arcsec2 e_mu0(r) Error on mu0(r)
191-195 F5.2 mag/arcsec2 mu0(B) Central surface brightness in B filter
197-201 F5.2 mag/arcsec2 mu0ci(B) Central surface brightness in B filter,
corrected for Galactic extinction and
inclination to the line of sight
203-207 F5.2 arcsec alpha(g) Scalelengths of model discs α(g)
209-212 F4.2 arcsec e_alpha(g) Error of scalelengths of model discs
214-217 F4.2 --- n(g) Sersic index
219-222 F4.2 --- e_n(g) Error index Sersic
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Note (1): Galaxy named JHHMM+DDMM are SDSS galaxies.
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Acknowledgements:
Yuliya Aleksandrovna Perepelitsyna, jlyamina(at)yandex.ru
References:
Pustilnik & Tepliakova, Paper I 2011MNRAS.415.1188P 2011MNRAS.415.1188P, Cat. J/MNRAS/415/1188
Pustilnik et al., Paper II 2011AstBu..66..255P 2011AstBu..66..255P
Pustilnik et al., Paper III 2011MNRAS.417.1335P 2011MNRAS.417.1335P
(End) Patricia Vannier [CDS] 04-Jun-2014