J/MNRAS/478/4336 Coma galaxies UV and opt. view (Mahajan+, 2018)
Ultraviolet and optical view of galaxies in the Coma supercluster.
Mahajan S., Singh A., Shobhana D.
<Mon. Not. R. Astron. Soc., 478, 4336-4347 (2018)>
=2018MNRAS.478.4336M 2018MNRAS.478.4336M (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxies, photometry ;
Photometry, ultraviolet ; Photometry, SDSS
Keywords: catalogues - galaxies: clusters: general - galaxies: evolution -
galaxies: fundamental parameters- galaxies: star formation -
ultraviolet: galaxies
Abstract:
The Coma supercluster (100h-1Mpc) offers an unprecedented contiguous
range of environments in the nearby Universe. In this paper, we
present a catalogue of spectroscopically confirmed galaxies in the
Coma supercluster detected in the ultraviolet (UV) wavebands. We use
the arsenal of UV and optical data for galaxies in the Coma
supercluster covering ∼500deg2 on the sky to study their photometric
and spectroscopic properties as a function of environment at various
scales. We identify the different components of the cosmic-web:
large-scale filaments and voids using Discrete Persistent Structures
Extractor, and groups and clusters using Hierarchical Density-based
spatial clustering of applications with noise, respectively. We find
that in the Coma supercluster the median emission in Hα
inclines, while the g-r and FUV-NUV colours of galaxies become bluer
moving further away from the spine of the filaments out to a radius of
∼1Mpc. On the other hand, an opposite trend is observed as the
distance between the galaxy and centre of the nearest cluster or group
decreases. Our analysis supports the hypothesis that properties of
galaxies are not just defined by its stellar mass and large-scale
density, but also by the environmental processes resulting due to the
intrafilament medium whose role in accelerating galaxy transformations
needs to be investigated thoroughly using multiwavelength data.
Description:
We have utilized the optical data from the SDSS DR 12 (Alam et al.,
2015ApJS..219...12A 2015ApJS..219...12A, Cat. V/147) and UV data from the GALEX survey
(Bianchi, Conti & Shiao, 2014AdSpR..53..967C 2014AdSpR..53..967C, Cat. II/335) to present
a catalogue of UV detected galaxies in the Coma supercluster. We have
used DISPERSETO characterize the large-scale filaments, and hdbscan
algorithm to identify the groups and clusters of galaxies in the Coma
supercluster.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 87 4280 The SDSS and GALEX data for all the Coma
supercluster galaxies in our sample
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See also:
V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)
II/335 : Revised catalog of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Plate SDSS plate identifier
6- 10 I5 --- MJD SDSS MJD identifier
12- 14 I3 --- Fiber SDSS Fiber identifier
16- 34 I19 --- GALEX ? GALEX objId
36- 42 F7.3 deg RAdeg Right ascension (J2000)
44- 49 F6.3 deg DEdeg Declination (J2000)
51- 56 F6.4 --- z Redshift
58 I1 --- LocEnv [0/2] local environment of galaxy (1)
60- 65 F6.2 mag rMAG Absolute SDSS r magnitude
67- 71 F5.2 mag NUVmag ?=- GALEX NUV magnitude
73- 76 F4.2 mag e_NUVmag ?=- rms uncertainty on NUVmag
78- 82 F5.2 mag FUVmag ?=- GALEX FUV magnitude
84- 87 F4.2 mag e_FUVmag ?=- rms uncertainty on FUVmag
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Note (1): local environment of galaxy code as follows:
0 = void
1 = filaments
2 = cluster/group
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 04-Oct-2021