J/MNRAS/435/1186 BI photometry of bulgeless galaxies (Sachdeva, 2013)
Magnitude and size evolution of bulgeless galaxies.
Sachdeva S.
<Mon. Not. R. Astron. Soc., 435, 1186-1197 (2013)>
=2013MNRAS.435.1186S 2013MNRAS.435.1186S
ADC_Keywords: Galaxies, photometry ; Morphology
Keywords: galaxies: bulges - galaxies: evolution -
galaxies: luminosity function, mass function - galaxies: structure
Abstract:
We examine the magnitude and size evolution of bulgeless (discs with
no-bulge or pseudo-bulge) galaxies up to z∼0.9 in rest-frame B band.
Their evolution is compared to that of normal-discs (or discs with
classical bulge). The study is done for luminous sources (MB≤-20)
in two equal-volume redshift bins (0.4≤z<0.77 and 0.77≤z<1.0) and a
local range (0.02≤z<0.05). The mean surface-brightness, muB, from
zmean=0.89 to zmean=0.04, shows a dimming of 0.79mag/arcsec2 for
bulgeless galaxies and 1.16mag/arcsec2 for normal-discs. The
characteristic magnitude, MB, shows an increase of 0.55mag for
bulgeless galaxies and 0.95mag for normal-discs. Both dimming and
faintness observed since z∼0.9 is more pronounced for the normal-discs
by ∼0.4mag. The size distribution is log-normal and both bulgeless and
normal-discs show a slight increase in the mean value,
<Δlog(Re)≳0.11, from zmean=0.89 to zmean=0.04. The proportion
of bulgeless galaxies in the full disc sample undergoes a considerable
decline with decrease in redshift. This along with the larger dimming
and faintness seen for normal-discs suggests that some fraction of the
bulgeless sources switch to the normal-disc morphology with time. To
ascertain the validity of studying morphology in the optical, the
properties of the galaxies observed in both rest-frame B and I band
are compared. The common sample is more luminous in the I band but the
sizes are larger in the B band for more than 74 percent of the
sources. The variation in the Sersic-index values of the galaxies in
the two rest-bands is minor enough to have any effect on the
morphological classification.
Description:
The images in V (F606W), i (F775W) and z (F850LP) filters of ACS (HST)
are used to study GOODS CDF-S in rest-frame B band. The SExtractor
software (Bertin & Arnouts, 1996A&AS..117..393B 1996A&AS..117..393B) is used for source
detection. The source detection is based on the F850LP image.
The catalogues obtained in V, i and z filters are averaged and merged
The images in near-IR filters, J (F125W) and H (F160W) of WFC3 (HST)
in the CDF-S, are used in a similar manner to obtain the properties in
rest-frame I band. according to redshift ranges to create a rest-frame
B-band catalogue.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
catalogi.dat 127 1109 I-band catalogue (from HST/ACS F775W images)
catalogb.dat 127 5103 Rest-frame B-band catalogue (from merged
F606W, F775W and F850LP images)
--------------------------------------------------------------------------------
Byte-by-byte Description of file: catalogi.dat catalogb.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 5 I5 --- ID [1/33912] Identification number
<[S2013] NNNNN> in Simbad
7- 13 F7.4 mag mag Integrated-magnitude from sersic-fitting
15- 22 F8.5 mag e_mag ?=99.9999 rms uncertainty on mag
24- 33 F10.6 pix re ?=99.9999 Half-light-radius in pixels
from sersic-fitting
35- 46 F12.8 pix e_re ?=99.9999 rms uncertainty on re
48- 56 F9.6 --- n [0/10[?=10 Sersic-index from sersic-fitting
58- 65 F8.5 --- e_n ?=99.9999 rms uncertainty on n
67- 74 F8.6 --- b/a [0/1] Axis-ratio from sersic-fitting
76- 84 F9.6 --- e_b/a ?=99.9999 rms uncertainty on b/a
86- 95 F10.7 deg RAdeg Right-ascension of barycenter (J2000)
97-107 F11.7 deg DEdeg Declination of barycenter (J2000)
109-116 F8.6 --- z Redshift from COMBO-17 survey
118-127 F10.8 --- e_z rms uncertainty on z redshift
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 22-Sep-2014