2018ApJ...863..134H

Query : 2018ApJ...863..134H

2018ApJ...863..134H - Astrophys. J., 863, 134-134 (2018/August-3)

Searching for the lowest-metallicity galaxies in the local universe.

HSYU T., COOKE R.J., PROCHASKA J.X. and BOLTE M.

Abstract (from CDS):

We report a method of identifying candidate low-metallicity blue compact dwarf galaxies (BCDs) from the Sloan Digital Sky Survey (SDSS) imaging data, and present 3 m Lick Observatory and 10 m W.M. Keck Observatory optical spectroscopic observations of 94 new systems that have been discovered with this method. The candidate BCDs are selected from Data Release 12 (DR12) of SDSS on the basis of their photometric colors and morphologies. Using the Kast spectrometer on the 3 m telescope, we confirm that the candidate low-metallicity BCDs are emission-line galaxies, and we make metallicity estimates using the empirical R and S calibration methods. Follow-up observations on a subset of the lowest-metallicity systems are made at Keck using the Low Resolution Imaging Spectrometer, which allow for a direct measurement of the oxygen abundance. We determine that 45 of the reported BCDs are low-metallicity candidates with 12 + log(O/H) <= 7.65, including six systems which are either confirmed or projected to be among the lowest-metallicity galaxies known, at 1/30 of the solar oxygen abundance, or 12 + log(O/H) ∼ 7.20.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: abundances - galaxies: dwarf - galaxies: evolution

VizieR on-line data: <Available at CDS (J/ApJ/863/134): table1.dat table2a.dat table2b.dat table5.dat>

Simbad objects: 97

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Number of rows : 97
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 AGC 102729 bCG 00 00 31.45824 +30 52 09.3144           ~ 10 0
2 SDSS J000032.31+305216.6 bCG 00 00 32.31720 +30 52 16.6188           ~ 1 0
3 SDSS J000351.07+333929.6 bCG 00 03 51.07824 +33 39 29.6316           ~ 1 0
4 SDSS J001859.31+234540.3 bCG 00 18 59.31720 +23 45 40.3344           ~ 2 0
5 SDSS J003355.79-093432.1 bCG 00 33 55.79136 -09 34 32.1816           ~ 1 0
6 SDSS J003539.64-044840.9 bCG 00 35 39.64704 -04 48 40.9392           ~ 1 0
7 SDSS J003930.30+012021.6 bCG 00 39 30.30168 +01 20 21.6132           ~ 1 0
8 SDSS J004855.31+315902.0 bCG 00 48 55.31304 +31 59 02.0508           ~ 1 0
9 SDSS J010524.94+124338.7 bCG 01 05 24.94680 +12 43 38.7084           ~ 1 0
10 SDSS J011840.00+351257.0 bCG 01 18 40.00776 +35 12 57.0168           ~ 6 0
11 SDSS J012357.56+330142.6 bCG 01 23 57.56568 +33 01 42.6324           ~ 1 0
12 SDSS J014024.18+295106.9 bCG 01 40 24.18288 +29 51 06.9408           ~ 1 0
13 SDSS J014254.99+070434.6 bCG 01 42 54.99720 +07 04 34.6908           ~ 1 0
14 SDSS J020114.93+091929.0 bCG 02 01 14.93328 +09 19 29.0100           ~ 1 0
15 SDSS J020645.15+322941.2 bCG 02 06 45.15192 +32 29 41.2980           ~ 1 0
16 LEDA 5807689 bCG 02 14 55.25256 +06 19 48.2736           ~ 6 0
17 SDSS J022023.30+204400.2 bCG 02 20 23.30712 +20 44 00.2904           ~ 1 0
18 SDSS J032100.55-143931.1 bCG 03 21 00.55440 -14 39 31.1868           ~ 1 0
19 SBSG 0335-052 AGN 03 37 44.06 -05 02 40.2     16.65     ~ 500 1
20 SDSS J045218.54-054123.7 bCG 04 52 18.54336 -05 41 23.7156           ~ 1 0
21 SDSS J074229.00+361610.8 bCG 07 42 29.00616 +36 16 10.8480           ~ 1 0
22 SDSS J074349.39+480724.2 bCG 07 43 49.39464 +48 07 24.2724           ~ 1 0
23 SDSS J074835.58+442848.6 bCG 07 48 35.58408 +44 28 48.6192           ~ 1 0
24 SDSS J075733.93+475030.7 bCG 07 57 33.93432 +47 50 30.7068           ~ 3 0
25 SDSS J080645.20+193711.5 bCG 08 06 45.20160 +19 37 11.5788           ~ 1 0
26 SDSS J081239.52+483645.3 bCG 08 12 39.532 +48 36 45.27           ~ 25 0
27 SDSS J083437.18+590536.0 bCG 08 34 37.218 +59 05 36.44           ~ 7 0
28 JKB 5 bCG 08 57 39.155 +59 02 56.41           ~ 7 0
29 SDSS J085744.38+590219.9 bCG 08 57 44.38440 +59 02 19.9032           ~ 4 0
30 SDSS J092713.61+031424.5 bCG 09 27 13.61088 +03 14 24.5940           ~ 2 0
31 Mrk 116 AGN 09 34 02.1 +55 14 25           ~ 1179 1
32 NAME Leoncino Dwarf Galaxy bCG 09 43 32.356 +33 26 57.65           ~ 58 0
33 Z 153-5 AG? 09 56 46.047 +28 49 43.77 14.82 14.74 14.59 14.55 26.509 ~ 252 1
34 SDSS J100008.52+273614.9 bCG 10 00 08.52264 +27 36 14.9040           ~ 2 0
35 SDSS J100512.15+372201.5 bCG 10 05 12.15288 +37 22 01.5312           ~ 5 0
36 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
37 SDSS J101759.35+430220.9 bCG 10 17 59.35104 +43 02 20.9760           ~ 1 0
38 SDSS J102144.08+411119.5 bCG 10 21 44.08584 +41 11 19.5144           ~ 1 0
39 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 268 0
40 SDSS J102901.20+564307.3 bCG 10 29 01.20600 +56 43 07.3236           ~ 1 0
41 SDSS J104442.66+630602.0 bCG 10 44 42.669 +63 06 02.09           ~ 23 0
42 2dFGRS TGN431Z147 bCG 10 45 45.68976 +02 09 12.5604   19.811   20.091   ~ 2 0
43 SDSS J114725.02+465204.0 bCG 11 47 25.02168 +46 52 04.0836           ~ 1 0
44 SDSS J114858.83+133710.4 bCG 11 48 58.83456 +13 37 10.4808           ~ 1 0
45 SDSS J115810.79+252950.1 bCG 11 58 10.79448 +25 29 50.2008           ~ 1 0
46 SDSSCGB 44071.2 bCG 11 58 41.749 +27 29 33.13           ~ 2 0
47 SDSS J120459.62+525934.6 bCG 12 04 59.62056 +52 59 34.6488           ~ 3 0
48 AGC 749452 bCG 12 09 20.02872 +24 26 49.5564           ~ 10 0
49 SDSS J121433.11+124549.2 bCG 12 14 33.11424 +12 45 49.2048           ~ 3 0
50 SDSS J123454.92+581654.7 bCG 12 34 54.9193953408 +58 16 54.485640156           ~ 1 0
51 SDSS J124414.50+464118.6 bCG 12 44 14.50104 +46 41 18.6756           ~ 1 0
52 SDSS J124636.04+274005.7 bCG 12 46 36.04488 +27 40 05.7180           ~ 1 0
53 JKB 29 bCG 13 01 10.392 +36 54 24.24           ~ 4 0
54 SDSS J131008.25+223745.7 bCG 13 10 08.25432 +22 37 45.7068           ~ 1 0
55 SDSS J131552.59+450609.0 bCG 13 15 52.59384 +45 06 09.0792           ~ 1 0
56 SDSS J132221.74+542627.8 bCG 13 22 21.7349077488 +54 26 27.808638036           ~ 2 0
57 SDSS J133434.51+342706.9 bCG 13 34 34.51464 +34 27 06.9192           ~ 1 0
58 AGC 238759 bCG 13 35 11.319 +07 29 15.32           ~ 5 0
59 LEDA 2078856 bCG 13 43 57.18 +36 19 59.2           ~ 3 0
60 SDSS J134505.68+543345.9 bCG 13 45 05.68608 +54 33 45.9756           ~ 1 0
61 JKB 2 bCG 14 04 06.044 +31 00 55.82           ~ 4 0
62 SDSS J141246.95+262404.6 bCG 14 12 46.95624 +26 24 04.6692           ~ 1 0
63 2dFGRS TGN206Z232 bCG 14 14 54.149 -02 08 22.92   18.065   17.598   ~ 25 0
64 SDSS J142515.83+444147.4 bCG 14 25 15.83376 +44 41 47.4684           ~ 1 0
65 SDSS J143526.81+051700.6 bCG 14 35 26.81064 +05 17 00.6864           ~ 1 0
66 SDSS J145922.78+240152.4 bCG 14 59 22.78608 +24 01 52.4352           ~ 1 0
67 SDSS J152027.60+541019.1 bCG 15 20 27.60288 +54 10 19.1280           ~ 1 0
68 SDSS J155418.40+462041.4 bCG 15 54 18.40080 +46 20 41.4276           ~ 1 0
69 SDSS J155730.71+141507.5 bCG 15 57 30.71184 +14 15 07.5132           ~ 1 0
70 SDSS J160416.11+145936.6 bCG 16 04 16.11792 +14 59 36.6864           ~ 1 0
71 SDSS J162412.73+095229.2 bCG 16 24 12.73392 +09 52 29.2368           ~ 1 0
72 SDSS J162845.99+443422.1 bCG 16 28 45.99648 +44 34 22.1196           ~ 1 0
73 SDSS J164842.40+484041.9 bCG 16 48 42.40344 +48 40 41.9592           ~ 1 0
74 SDSS J165539.20+633703.3 bCG 16 55 39.20688 +63 37 03.3456           ~ 3 0
75 SDSS J170228.76+193801.8 bCG 17 02 28.76688 +19 38 01.8708           ~ 1 0
76 SDSS J170540.13+352747.3 bCG 17 05 40.13688 +35 27 47.3112           ~ 2 0
77 SDSS J173206.56+445253.6 bCG 17 32 06.56208 +44 52 53.6376           ~ 1 0
78 SDSS J175702.36+645417.6 bCG 17 57 02.36304 +64 54 17.6580           ~ 2 0
79 SDSS J203002.86-134352.6 bCG 20 30 02.86944 -13 43 52.6296           ~ 2 0
80 SDSS J213440.25+040218.5 bCG 21 34 40.25376 +04 02 18.5748           ~ 1 0
81 SDSS J215640.41+045906.4 bCG 21 56 40.41360 +04 59 06.4248           ~ 1 0
82 SDSS J220213.79+170812.2 bCG 22 02 13.79856 +17 08 12.2604           ~ 1 0
83 SDSS J221348.45+172235.6 bCG 22 13 48.45696 +17 22 35.6376           ~ 2 0
84 SDSS J221513.93+061000.6 bCG 22 15 13.93008 +06 10 00.6096           ~ 1 0
85 SDSS J223044.54-053104.7 bCG 22 30 44.5642567848 -05 31 04.484910828           ~ 1 0
86 SDSS J224848.30+144904.0 bCG 22 48 48.30096 +14 49 04.0404           ~ 1 0
87 SDSS J225129.81+021217.1 bCG 22 51 29.81808 +02 12 17.1936           ~ 2 0
88 SDSS J230005.11+091852.4 bCG 23 00 05.11392 +09 18 52.4592           ~ 1 0
89 SDSS J231753.87-075559.8 bCG 23 17 53.87664 -07 55 59.8908           ~ 1 0
90 SDSS J231958.75+161658.7 bCG 23 19 58.75536 +16 16 58.7388           ~ 1 0
91 SDSS J232743.68-020055.8 bCG 23 27 43.6933492728 -02 00 55.740869568           ~ 4 0
92 SDSS J233559.66+125231.2 bCG 23 35 59.66328 +12 52 31.1952           ~ 1 0
93 SDSS J233604.05+125228.6 bCG 23 36 04.05984 +12 52 28.6428           ~ 1 0
94 SDSS J233935.61+323038.1 bCG 23 39 35.6410184232 +32 30 37.969028064           ~ 1 0
95 SDSS J234029.55-205740.7 bCG 23 40 29.55264 -20 57 40.7844           ~ 1 0
96 SDSS J234750.91+224434.6 bCG 23 47 50.91624 +22 44 34.6524           ~ 2 0
97 SDSS J235651.86-192806.5 bCG 23 56 51.86400 -19 28 06.5424           ~ 1 0

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