J/A+A/677/A117 AMIGA XIV. Disc breaks and interactions (Sanchez-Alarcon+, 2023)
The AMIGA sample of isolated galaxies
XIV. Disc breaks and interactions through ultra-deep optical imaging.
Sanchez-Alarcon, P.M., Roman J., Knapen J. H., Verdes-Montenegro L.,
Comeron, S., Rich, R. M., Beckman, J., Argudo-Fernandez, M.,
Ramirez-Moreta, P., Blasco, J., E. Unda-Sanzana, Garrido, J.,
Sanchez-Exposito, S.
<Astron. Astrophys. 677, A117 (2023)>
=2023A&A...677A.117S 2023A&A...677A.117S (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Galaxies, optical
Keywords: galaxies: evolution - galaxies: structure - galaxies: photometry -
galaxies: interactions
Abstract:
In the standard cosmological model of galaxy evolution, mergers and
interactions play a fundamental role in shaping galaxies. Galaxies
that are currently isolated are thus interesting, allowing us to
distinguish between internal and external processes affecting the
galactic structure. However, current observational limits may obscure
crucial information in the low-mass or low-brightness regime. We use
optical imaging of a subsample of the AMIGA catalogue of isolated
galaxies to explore the impact of different factors on the structure
of these galaxies. We study the type of disc break as a function of
the degree of isolation and the presence of interaction indicators
like tidal streams or plumes only detectable in the low surface
brightness regime. We present deep optical imaging of a sample of 25
isolated galaxies. Through careful data processing and analysis
techniques, the surface brightness limits achieved are comparable to
those to be obtained on the 10-year LSST coadds. The extreme depth of
our imaging allows us to study the interaction signatures of 20
galaxies, given that the presence of Galactic cirrus is a strong
limiting factor in the characterisation of interactions for the
remaining 5 of them. We detect previously unreported interaction
features in 8 (40%) galaxies in our sample. We identify 9 galaxies
(36%) showing an exponential disc (Type I), 14 galaxies (56%) with
down-bending (Type II) profile and only 2 galaxies (8%) with
up-bending (Type III) profiles. Isolated galaxies have considerably
more purely exponential discs and fewer up-bending surface brightness
profiles than field or cluster galaxies. We suggest that major mergers
produce up-bending profiles while a threshold in star formation
probably forms down-bending profiles. Unperturbed galaxies, evolving
slowly with a low star formation rate could cause the high rate of
Type I discs in isolated galaxies observed.
Description:
Details of the galaxies observed, instruments used and results of the
paper are presented in tables.dat. The directories included
the images and profiles parameters and intensity measured for each
radial bin for each of the galaxies used in the paper. Calibration
values can be found in tables.dat and in the header of each profile.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tables.dat 156 25 Details of sample observed with the its break
information
profiles/* . 25 Individual fits surface brightness profiles
list.dat 106 25 List of fits images
fits/* . 25 Individual fits science images and masks
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See also:
VII/82 : Catalogue of Isolated Galaxies (Karachentseva+ 1986)
J/A+A/411/391 : AMIGA project Revised positions for CIG galaxies (Leon+ 2003)
J/A+A/436/443 : AMIGA I. Velocities of CIG galaxies (Verdes-Montenegro+ 2005)
J/A+A/560/A9 : AMIGA XII. Isolation degree (Argudo-Fernandez+, 2013)
J/A+A/609/A17 : AMIGA XIII. HI properties (Jones+, 2018)
http://amiga.iaa.es : AMIGA Home Page
Byte-by-byte Description of file: tables.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Galaxy Galaxy CIG
(Catalogue of Isolated Galaxies) Number
9- 17 A9 --- Name Common Galaxy Name
19- 28 F10.6 deg RAdeg Right Ascension (J2000)
30- 39 F10.6 deg DEdeg Declination (J2000)
41- 47 A7 --- Tel Telescope used (1)
49- 59 A11 --- Band Filter used
61- 64 F4.1 mag/arcsec2 Depth Depth of the image
66- 70 I5 km/s Vrad Radial velocity of the galaxy (3)
72- 77 F6.4 1/arcsec Scale Pixel scale of the image
79- 85 F7.4 mag ZP Zero point of the image
87- 95 F9.7 --- z Redshift of the galaxy
97-100 F4.1 h ExpTime ?=- Total exposure time
102-106 F5.3 deg2 FOV Field of View of the image
108-110 A3 --- Break [I II III] Break type of the galaxy (2)
112-115 F4.1 kpc BreakRad ?=- Radius where the break occurs
117-119 F3.1 kpc e_BreakRad ?=- Error of BreakRadius
121-124 F4.1 mag/arcsec2 BreakMag ?=- Surface Brightness where the
break occurs
126-128 F3.1 mag/arcsec2 e_BreakMag ?=- Error of BreakMag
130-134 F5.2 --- Q-Kar-p ?=- Tidal strength estimate QKar,p
of similar-size neighbours (3)
136-139 F4.2 --- eta-k-p ?=- Local number density ηk,p
of similar-size neighbours (3)
141-143 A3 --- Class Classification of galaxy (4)
145-156 A12 --- FileName Name of the surface brightness profile
files in subdirectory profiles (5)
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Note (1): Telescope code as follows:
HSC-SSP = Hyper Suprime-Cam Subaru Strategic Program
INT = 2.5m Isaac Newton Telescope
JRT = 0.7m Jeanne-Rich Telescope
VST = VLT Survey Telescope
Note (2): Break types as follows:
I = single exponential disc
II = down bending break
III = up bending break
Note (3): References of columns not original from this work
Vrad : Jones et al. (2018, Cat. J/A+A/609/A17 )
Q-Kar-p : Argudo-Fernandez et al. (2013, Cat. J/A+A/560/A9)
eta-k-p : Argudo-Fernandez et al. (2013, Cat. J/A+A/560/A9)
Note (4): Classes are divided into 3 categories (section 3.5) as follows:
H = galaxy shows a bright halo contribution
T = galaxy shows a tidal stream feature
C = galaxy embedded in a region with Galactic cirrus
Note (5): Each galaxy in the table has an intensity profile. All calibration
information to produce the surface brightness profile is stored in
the header of each file. The KEYWORDS of each value are:
ZP : zero point in mag/arcsec2
SCALE : pixel scale in pixel/arcsec
BKG : sky background in counts
BKGSTD : standard deviation of the sky background in counts
--------------------------------------------------------------------------
Field 1 : arcsec Rad Radius of measured intensity
Field 2 : ct Int Average intensity of elliptical region
Field 3 : ct e_Int Error in intensity
Field 4 : deg PA Positional angle of elliptical region
Field 5 : --- eps Ellipticity (1-b/a) of elliptical region
--------------------------------------------------------------------------
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Galaxy Galaxy CIG
(Catalogue of Isolated Galaxies) Number
9- 17 F9.5 deg RAdeg Right Ascension of center (J2000)
18- 26 F9.5 deg DEdeg Declination of center (J2000)
28- 32 I5 --- Nx Number of pixels along X-axis
34- 38 I5 --- Ny Number of pixels along Y-axis
40- 62 A23 "datime" Obs.date Observation date
64- 70 I7 Kibyte size Size of FITS file
72- 83 A12 --- FileName Name of FITS file, in subdirectory fits
85-106 A22 --- Title Title of the FITS file
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Acknowledgements:
Pablo M. Sanchez-Alarcon, pasa.astro(at)gmail.com
Javier Roman, jromanastro(at)gmail.com
(End) Pablo M. Sanchez-Alarcon [IAC], Patricia Vannier [CDS] 03-Aug-2023