J/ApJ/859/5 Surface brightness profiles of NGC2784 group vs Virgo (Lee+, 2018)
Difference in dwarf galaxy surface brightness profiles as a function of
environment.
Lee Y., Park H.S., Kim S.C., Moon D.-S., Lee J.-J., Kim D.-J., Cha S.-M.
<Astrophys. J., 859, 5 (2018)>
=2018ApJ...859....5L 2018ApJ...859....5L
ADC_Keywords: Galaxies, nearby; Morphology; Magnitudes, absolute;
Clusters, galaxy
Keywords: galaxies: dwarf ; galaxies: evolution ;
galaxies: groups: individual (NGC 2784 group) ; galaxies: structure
Abstract:
We investigate surface brightness profiles (SBPs) of dwarf galaxies in
field, group, and cluster environments. With deep BVI images from the
Korea Microlensing Telescope Network Supernova Program, SBPs of 38
dwarfs in the NGC 2784 group are fitted by a single-exponential or
double-exponential model. We find that 53% of the dwarfs are fitted
with single-exponential profiles ("Type I"), while 47% of the dwarfs
show double-exponential profiles; 37% of all dwarfs have smaller sizes
for the outer part than the inner part ("Type II"), while 10% have a
larger outer than inner part ("Type III"). We compare these results
with those in the field and in the Virgo cluster, where the SBP types
of 102 field dwarfs are compiled from a previous study and the SBP
types of 375 cluster dwarfs are measured using SDSS r-band images. As
a result, the distributions of SBP types are different in the three
environments. Common SBP types for the field, the NGC 2784 group, and
the Virgo cluster are Type II, Type I and II, and Type I and III
profiles, respectively. After comparing the sizes of dwarfs in
different environments, we suggest that since the sizes of some dwarfs
are changed due to environmental effects, SBP types are capable of
being transformed and the distributions of SBP types in the three
environments are different. We discuss possible environmental
mechanisms for the transformation of SBP types.
Description:
In this paper, we investigate the surface brightness profiles (SBPs)
of dwarfs in the NGC 2784 group observed using the Korea Microlensing
Telescope Network (KMTNet) Supernova Program (KSP; Moon+
2016SPIE.9906E..4IM ; Park+ 2017ApJ...848...19P 2017ApJ...848...19P) and compare their
properties with those of field and cluster galaxies.
For cluster dwarf samples, we used 680 dwarfs (dE, dS0, Im, Sm, and
BCD) with -17mag<MB<-12mag and vh<3500km/s in the Virgo Cluster
Catalog (Binggeli+ 1985, J/AJ/90/1681). Among the selected 680 dwarf
samples, we remove 305 dwarf samples that are possibly contaminated by
halos of nearby bright galaxies or stars in SDSS r-band images.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 70 38 Properties of dwarf galaxies in the NGC 2784 group
table3.dat 70 375 Properties of dwarf galaxies in the Virgo cluster
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See also:
VII/237 : HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003)
VII/266 : Atlas of Virgo galaxies (McDonald+ 2011)
J/AJ/90/1681 : The Virgo Cluster Catalog (VCC) (Binggeli+, 1985)
J/A+AS/100/47 : Lyon Groups of Galaxies (Garcia 1993)
J/A+AS/121/507 : Near-IR surface photometry of Virgo galaxies (Boselli+ 1997)
J/ApJS/126/271 : Surface photometry of nearby field galaxies (Jansen+ 2000)
J/AJ/128/2170 : Hα imaging of irregular galaxies (Hunter+, 2004)
J/ApJS/162/49 : UBV imaging of irregular galaxies (Hunter+, 2006)
J/ApJ/655/144 : ACS Virgo Cluster Survey. XIII. (Mei+, 2007)
J/MNRAS/412/2498 : Gal. groups & clouds in the local universe (Makarov+, 2011)
J/A+A/540/A47 : AMIGA X. Isolated galaxy colors (Fernandez Lorenzo+, 2012)
J/AJ/146/104 : Dwarf gal. surface brightness profiles. I. (Herrmann+, 2013)
J/ApJ/771/59 : Surface brightness of S4G face-on gal. (Munoz-Mateos+, 2013)
J/ApJS/215/22 : The Extended Virgo Cluster Catalog (EVCC) (Kim+, 2014)
J/MNRAS/441/1992 : Galaxies with disc breaks in S4G and NIRS0S (Laine+, 2014)
J/MNRAS/445/630 : Early-type galaxies in Ursa Major cluster (Pak+, 2014)
J/A+A/588/A103 : 2nd ROSAT all-sky survey (2RXS) source cat. (Boller+, 2016)
Byte-by-byte Description of file: table[13].dat
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Bytes Format Units Label Explanations
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1- 14 A14 --- ID Identifier
16- 23 F8.4 deg RAdeg Right ascension, decimal degrees (J2000)
25- 32 F8.4 deg DEdeg Declination, decimal degrees (J2000)
34- 34 A1 --- Morph Morphological Type (1)
36- 38 A3 --- SBP Surface brightness profile type (2)
40- 46 F7.3 mag BMag [-17/-8.8]? Absolute B band magnitude
48- 52 F5.3 kpc hi [0.1/3.5]? inner scale length (3)
54- 58 F5.3 kpc e_hi [0.001/4]? Uncertainty in hi (3)
60- 64 F5.3 kpc ho [0.1/2.4]? outer scale length (3)
66- 70 F5.3 kpc e_ho [0.001/0.8]? Uncertainty in hi (3)
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Note (1): Morphological Type as follows:
E = early-type (dE, dS0);
L = late-type (Im, Sm, BCD);
? = unclassified morphologies.
Note (2): Type as follows:
I = classical dwarfs with single-exponential profiles
(Freeman 1970ApJ...160..811F 1970ApJ...160..811F); 20 occurrences for NGC 2784 group vs
193 occurrences for Virgo cluster
II = double-exponentials with smaller outer sizes than inner sizes
(Freeman 1970ApJ...160..811F 1970ApJ...160..811F); 14 occurrences for NGC 2784 group vs
47 occurrences for Virgo cluster
III = double-exponentials with larger outer sizes than inner sizes
(Erwin+ 2005ApJ...626L..81E 2005ApJ...626L..81E); 4 occurrences for NGC 2784 group vs
135 occurrences for Virgo cluster
Note (3): In the case of SBP=I, the inner and outer scale lengths are the
same and are indicated in the column hi.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 03-Apr-2019