J/MNRAS/506/5494 MATLAS dwarfs structure and morphology (Poulain+, 2021)
Structure and morphology of the MATLAS dwarf galaxies and their central nuclei.
Poulain M., Marleau F., Habas R., Duc P.A., Sanchez-Janssen R.,
Durrell P.R., Paudel S., Ahad S.L., Chougule A., Mueller O., Lim S.,
Bilek M., Fensch J.
<Mon. Not. R. Astron. Soc. 506, 5494-5511 (2021)>
=2021MNRAS.506.5494P 2021MNRAS.506.5494P (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, nearby ; Galaxy catalogs ; Galaxies, optical ;
Galaxies, photometry
Keywords: galaxies: dwarf - galaxies: nuclei - galaxies: photometry -
galaxies: structure
Abstract:
We present a photometric study of the dwarf galaxy population in the
low to moderate density environments of the MATLAS (Mass Assembly of
early-Type gaLAxies with their fine Structures) deep imaging survey.
The sample consists of 2210 dwarfs, including 508 nucleated. We define
a nucleus as a compact source that is close to the galaxy photocentre
(within 0.5Re) which is also the brightest such source within the
galaxy's effective radius. The morphological analysis is performed
using a 2D surface brightness profile modelling on the g-band images
of both the galaxies and nuclei. Our study reveals that, for similar
luminosities, the MATLAS dwarfs show ranges in the distribution of
structural properties comparable to cluster (Virgo and Fornax) dwarfs
and a range of sizes comparable to the Local Group and Local Volume
dwarfs. Colour measurements using the r- and i-band images indicate
that the dwarfs in low and moderate density environments are as red as
cluster dwarfs on average. The observed similarities between dwarf
ellipticals in vastly different environments imply that dEs are not
uniquely the product of morphological transformation due to
ram-pressure stripping and galaxy harassment in high density
environments. We measure that the dwarf nuclei are located
predominantly in massive, bright and round dwarfs and observe fewer
nuclei in dwarfs with a faint centre and a small size. The colour of
the galaxy nucleus shows no clear relation to the colour of the dwarf,
in agreement with the migration and wet migration nucleus formation
scenarios. The catalogues of the MATLAS dwarfs photometric and
structural properties are provided.
Description:
This work is based on data in the g, r and i-bands from the MATLAS
survey (Duc et al., 2015MNRAS.446..120D 2015MNRAS.446..120D, Cat. J/MNRAS/446/120)
performed with the Canada-France-Hawaii telescope. This catalogue
presents 2210 dwarf galaxies, the structural and photometric
properties of the 1589 with a 2D Sersic modelling, and the properties
of their 524 nuclei.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 112 2210 Structural and photometric properties of the
MATLAS dwarfs
table4.dat 63 524 Properties of the MATLAS nuclei
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See also:
J/MNRAS/446/120 : ATLAS3D project. XXIX (Duc+, 2015)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- ID Dwarf ID, MATLAS-NNNN
13- 21 A9 --- HostETG Assumed host ETG
23- 26 F4.1 Mpc Dist Distance
28 I1 --- f_Dist [1/4] Distance flag (1)
30- 34 F5.2 Mpc Distl ? Distance measurement
35 A1 --- r_Distl [a-e] Distance measurement reference (G1)
37- 44 F8.4 deg RAdeg Dwarf Right ascension (J2000)
46- 52 F7.4 deg DEdeg Dwarf Declination (J2000)
54- 58 F5.2 mag gmag ? Apparent magnitude in g-band
60- 64 F5.2 mag g-i ? g-i color corrected for Galactic extinction
66- 70 F5.2 mag g-r ? g-r color corrected for Galactic extinction
74- 77 F4.2 --- n ? Sersic index
78 A1 --- n_n [*] Note on Sersic index (3)
79- 83 F5.2 arcsec Re ? Effective radius
85- 88 F4.2 --- b/a ? Axis ratio
90- 95 F6.2 deg PA []? Position angle
97-101 F5.2 mag/arcsec2 mu0g ? Central surface brightness in g-band
103-107 F5.2 mag/arcsec2 ? Average surface brightness within Re
in g-band
109-112 A4 --- Morph Morphology of the dwarf (4)
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Note (1): Distance flag as follows:
1 = one single massive Atlas3D galaxy in the field with distance
2 = several massive Atlas3D galaxies in the field all located at roughly
the same distance
3 = several massive Atlas3D galaxies in the field with a majority at
roughly the same distance, but some discrepant one(s)
4 = several massive Atlas3D galaxies in the field with a range of distances
Note (3): Note on Sersic index as follows:
* = a Sersic index derived on a binned image
Note (4): Morphology code as follows:
dE = elliptical dwarf
dEN = elliptical nucleated dwarf
dE* = dwarf whose nucleus matched with a star in Gaia DR2 catalog
dE** = dwarf for which one of the central bright GCs
is possibly a NSC (Forbes et al. 1989ApJ...346L..53F 1989ApJ...346L..53F).
dI = irregular dwarf
dIN = irregular nucleated dwarf
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- ID Dwarf ID, MATLAS-NNNN
13- 16 F4.1 Mpc Dist Distance
18- 22 F5.2 Mpc Distl ? Distance measurement
23 A1 --- r_Distl [a-e] Distance measurement reference (G1)
25- 32 F8.4 deg RAdeg Dwarf Right ascension (J2000)
34- 40 F7.4 deg DEdeg Dwarf Declination (J2000)
42- 45 F4.2 arcsec Offset Offset distance from photocenter
47- 51 F5.2 mag gmag ? Apparent magnitude in g band
53- 57 F5.2 mag g-i ? g-i color corrected for galactic extinction
59- 63 F5.2 mag g-r ? g-r color corrected for galactic extinction
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Global notes:
Note (G1): Distance measurement reference as follows:
a = SDSS DR13 database
b = Poulain et al., in preparation
c = Ann et al. (2015ApJS..217...27A 2015ApJS..217...27A, Cat. J/ApJS/217/27)
d = Karachentsev et al. (2013AJ....145..101K 2013AJ....145..101K, Cat. J/AJ/145/101)
e = Mueller et al. (2020A&A...640A.106M 2020A&A...640A.106M, Cat. J/A+A/640/A106)
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Acknowledgements:
Melina Poulain, melina.poulain(at)student.uibk.ac.at
(End) Patricia Vannier [CDS] 17-Aug-2021