J/MNRAS/468/703 Abell 168 ultra-diffuse galaxies distribution (Roman+, 2017)
Spatial distribution of ultra-diffuse galaxies within large-scale structures.
Roman J., Trujillo I.
<Mon. Not. R. Astron. Soc., 468, 703-716 (2017)>
=2017MNRAS.468..703R 2017MNRAS.468..703R (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Galaxy catalogs ; Morphology ; Photometry, SDSS
Keywords: galaxies: dwarf - galaxies: evolution - galaxies: formation -
galaxies: photometry - galaxies: structure
Abstract:
Taking advantage of the Sloan Digital Sky Survey Stripe82 data, we
have explored the spatial distribution of ultra-diffuse galaxies
(UDGs) within an area of 8x8Mpc2 centred around the galaxy cluster
Abell 168 (z=0.045). This intermediate massive cluster
(σ=550km/s) is surrounded by a complex large-scale structure.
Our work confirms the presence of UDGs in the cluster and in the
large-scale structure that surrounds it, and it is the first detection
of UDGs outside clusters. Approximately 50 per cent of the UDGs
analysed in the selected area inhabit the cluster region (∼11±5 per
cent in the core and ∼39±9 per cent in the outskirts), whereas the
remaining UDGs are found outside the main cluster structure (∼50±11
per cent). The colours and the spatial distribution of the UDGs within
this large-scale structure are more similar to dwarf galaxies than to
L* galaxies, suggesting that most UDGs could be bona fide dwarf
galaxies.
Description:
We have explored the properties of UDGs inhabiting the Abell Cluster
168 (z=0.045) and its rich surrounding large-scale structure.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 72 80 *Position and structural properties of the
selected UDG candidates in the area surrounding
Abell Cluster 168
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Note on tableb1.dat: The structural parameters were derived using IMFIT
(Erwin 2015ApJ...799..226E 2015ApJ...799..226E).
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Name (IACNN)
7- 13 F7.4 deg RAdeg Right ascension (J2000)
15- 21 F7.4 deg DEdeg Declination (J2000)
23- 26 F4.1 mag/arcsec+2 SuBrg0 Surface brightness in g band corrected
for dust extinction
28- 30 F3.1 mag/arcsec+2 E_SuBrg0 Error on SuBrg0 (upper value)
32- 34 F3.1 mag/arcsec+2 e_SuBrg0 Error on SuBrg0 (lower value)
36- 38 F3.1 kpc re Effective radius along the semimajor axis
40- 42 F3.1 kpc e_re rms uncertainty on re
44- 48 F5.1 mag gMAG Absolute g magnitude
50- 52 F3.1 mag e_gMAG rms uncertainty on gMAG
54- 57 F4.2 --- b/a Axis ratio
59- 62 F4.2 --- e_b/a rms uncertainty on b/a
64- 67 F4.2 --- n Sersic index
69- 72 F4.2 --- e_n rms uncertainty on n
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 03-Dec-2019