2016ApJ...822..108H

Query : 2016ApJ...822..108H

2016ApJ...822..108H - Astrophys. J., 822, 108-108 (2016/May-2)

ALFALFA discovery of the most metal-poor gas-rich galaxy known: AGC 198691.

HIRSCHAUER A.S., SALZER J.J., SKILLMAN E.D., BERG D., McQUINN K.B.W., CANNON J.M., GORDON A.J.R., HAYNES M.P., GIOVANELLI R., ADAMS E.A.K., JANOWIECKI S., RHODE K.L., POGGE R.W., CROXALL K.V. and AVER E.

Abstract (from CDS):

We present spectroscopic observations of the nearby dwarf galaxy AGC 198691. This object is part of the Survey of H i in Extremely Low-Mass Dwarfs project, which is a multi-wavelength study of galaxies with H i masses in the range of 106-107.2 M☉, discovered by the Arecibo Legacy Fast ALFA (ALFALFA) survey. We have obtained spectra of the lone H ii region in AGC 198691 with the new high-throughput KPNO Ohio State Multi-Object Spectrograph on the Mayall 4 m, as well as with the Blue Channel spectrograph on the MMT 6.5 m telescope. These observations enable the measurement of the temperature-sensitive [O iii]λ4363 line and hence the determination of a "direct" oxygen abundance for AGC 198691. We find this system to be an extremely metal-deficient (XMD) system with an oxygen abundance of 12+log(O/H)=7.02±0.03, making AGC 198691 the lowest-abundance star-forming galaxy known in the local universe. Two of the five lowest-abundance galaxies known have been discovered by the ALFALFA blind H i survey; this high yield of XMD galaxies represents a paradigm shift in the search for extremely metal-poor galaxies.

Abstract Copyright: © 2016. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: abundances - galaxies: dwarf - galaxies: evolution - galaxies: ISM - galaxies: star formation

Nomenclature: NAME Leoncino Dwarf Galaxy N=1.

CDS comments: Table 3: Galaxies AGC 194054, AGC 194068, AGC 194100 and AGC 205590 are not in SIMBAD.

Simbad objects: 16

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Number of rows : 16
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 [PBT2001] SBSG 0335-052 W G 03 37 38.40 -05 02 37.5   19.14     18.85 ~ 110 1
2 SBSG 0335-052B G 03 37 44.04 -05 02 40.2   16.77 16.65   16.79 ~ 220 1
3 GD 50 WD* 03 48 50.1859724280 -00 58 32.290187664 12.596 13.787 14.063 14.210 14.388 DA1.2 272 1
4 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1153 0
5 Mrk 116 AGN 09 34 02.1 +55 14 25           ~ 1179 1
6 UGC 5186 AG? 09 42 58.664 +33 15 56.10   16.5       ~ 52 0
7 NAME Leoncino Dwarf Galaxy bCG 09 43 32.356 +33 26 57.65           ~ 58 0
8 UGC 5209 LSB 09 45 04.196 +32 14 16.03   19       ~ 66 0
9 Z 152-72 EmG 09 50 22.769 +31 29 17.80   14.48   14.10   ~ 207 0
10 Z 153-5 AG? 09 56 46.047 +28 49 43.77 14.82 14.74 14.59 14.55 26.509 ~ 252 1
11 Z 153-14 AG? 10 04 40.949 +29 21 51.54   15.2       ~ 75 0
12 NAME Leo P BiC 10 21 45.123 +18 05 16.89           ~ 268 0
13 NAME Local Supercluster SCG 12 31 +12.4           ~ 566 0
14 BD+28 4211 HS* 21 51 11.0221915656 +28 51 50.367627468 8.922 10.25 10.58 10.656 10.831 sdO2VIIIHe5 837 0
15 NAME Local Group GrG ~ ~           ~ 9325 0
16 NAME Leo Spur reg ~ ~           ~ 36 0

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