J/AJ/142/145 Outer disks of S0-Sb gal. II. Surface-brigthness (Gutierrez+, 2011)
The outer disks of early-type galaxies.
II. Surface-brightness profiles of unbarred galaxies and trends with Hubble
type.
Gutierrez L., Erwin P., Aladro R., Beckman J.E.
<Astron. J., 142, 145 (2011)>
=2011AJ....142..145G 2011AJ....142..145G
ADC_Keywords: Galaxies, photometry ; Morphology
Keywords: galaxies: elliptical and lenticular, cD - galaxies: spiral -
galaxies: structure
Abstract:
We present azimuthally averaged radial profiles of R-band surface
brightness for a complete sample of 47 early-type, unbarred galaxies,
as a complement to our previous study of early-type barred galaxies.
Following very careful sky subtraction, the profiles can typically be
determined down to brightness levels well below 27mag/arcsec2 and in
the best cases below 28mag/arcsec-2. We classified the profiles
according to the scheme used previously for the barred sample: Type I
profiles are single unbroken exponential radial declines in
brightness; Type II profiles ("truncations") have an inner shallow
slope (usually exponential) which changes at a well-defined break
radius to a steeper exponential; and Type III profiles
("antitruncations") have an inner exponential that is steeper, giving
way to a shallower outer (usually exponential) decline. By combining
these profiles with previous studies, we can make the first clear
statements about the trends of outer-disk-profile types along the
Hubble sequence (including both barred and unbarred galaxies), and
their global frequencies.
Description:
The sample presented here is the unbarred counterpart to the
barred-galaxy sample presented in Paper I (Erwin et al.
2008AJ....135...20E 2008AJ....135...20E).
The largest subset of images (22 galaxies) came from an observing run
with the Wide Field Camera (WFC) of the Isaac Newton Telescope (INT)
of the Roque de los Muchachos Observatory (ORM), La Palma, Spain, in
the period of 2004 March 14-17, with the r filter; one exception:
UGC 4599 with the B-band.
For 19 of the galaxies, we used SDSS-DR5 (Cat. II/276; superseded by
II/306).
Images for six galaxies were taken from the archive. Four of these
were taken with the Jacobus Kapteyn Telescope (JKT; in 2000 May 31 &
Nov 01, 2002 Sept 09 and 2003 Mar 08) and two with the Isaac Newton
Telescope (1994 Dec 04). We used images taken with R or r filters for
all but one of these galaxies; the exception was NGC 7457, for which
the best available image was in the V band calibrated to R.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 53 47 Basic galaxy data
table8.dat 22 8960 Surface brightness profiles
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See also:
II/306 : The SDSS Photometric Catalog, Release 8 (Adelman-McCarthy+, 2011)
VII/155 : Third Reference Cat. of Bright Galaxies (RC3) (de Vaucouleurs+ 1991)
VII/26 : Uppsala General Catalogue of Galaxies (UGC) (Nilson 1973)
J/ApJ/664/226 : Nuker law parameters of early-type galaxies (Lauer+, 2007)
J/ApJS/162/49 : UBV imaging of irregular galaxies (Hunter+, 2006)
J/A+A/415/63 : Surface brightness of 26 bright galaxies (Mollenhoff, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Galaxy name
10- 21 A12 --- TType Morphological type classification from
de Vaucouleurs et al. (1991, Cat. VII/155)
23- 26 F4.1 Mpc Dist Distance
28 I1 --- r_Dist Reference for distance (1)
30- 32 I3 arcsec R25 Half of the corrected µB=25mag diameter
D0 from RC3
34- 36 I3 pc/arcsec Scale Scale
38- 40 I3 deg PA Position Angle of the outer disk (2)
42- 43 I2 deg Incl Inclination of the outer disk (2)
45- 49 F5.1 mag BMag Absolute B-band magnitude (3)
51- 53 I3 km/s Vmax ? Maximum rotation velocity (4)
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Note (1): reference as follows:
1 = Tonry et al. (2001ApJ...546..681T 2001ApJ...546..681T), including metallicity correction
from Mei et al. (2005ApJ...625..121M 2005ApJ...625..121M),
2 = Freedman et al. (2001ApJ...553...47F 2001ApJ...553...47F),
3 = mean distance to Virgo Cluster from Mei et al. (2007ApJ...655..144M 2007ApJ...655..144M),
4 = radial velocity, corrected for Local Group infall onto Virgo (from LEDA),
using H0=75km/s/Mpc.
Note (2): Position angle and inclination of the outer disk, measured in this
work (see Section 2.4).
Note (3): Absolute B magnitude, using the corrected apparent magnitude Btc
from LEDA and Dist.
Note (4): Maximum rotation velocity calculated using the apparent maximum
rotation velocity of gas Vmaxg from LEDA corrected for Incl.
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Byte-by-byte Description of file: table8.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Name Galaxy name
10- 16 F7.2 arcsec a Semimajor axis
18- 22 F5.2 mag/arcsec2 mu R-band surface brightness, except for
UGC 4599 which is the B-band.
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History:
From electronic version of the journal
References:
Erwin et al. Paper I 2008AJ....135...20E 2008AJ....135...20E
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 05-Mar-2013