2012AJ....143..145K

Query : 2012AJ....143..145K

2012AJ....143..145K - Astron. J., 143, 145 (2012/June-0)

Hα dots: a catalog of faint emission-line objects discovered in narrowband images.

KELLAR J.A., SALZER J.J., WEGNER G., GRONWALL C. and WILLIAMS A.

Abstract (from CDS):

During a wide-field narrowband Hα imaging survey, we noted the presence of numerous isolated emission-line point sources in the data. These objects could represent ultra-low-luminosity galaxies at low-redshift (detection via Hα), isolated extragalactic H II regions associated with the galaxy targeted by the original observation, or background galaxies or QSOs where strong emission lines (most often [O III] λ5007) redshift into our narrowband filter. We have carried out a systematic search for these "Hα dots" in over 200 15x15 arcmin fields. To date we have cataloged 61 candidate emission-line sources in roughly 11.7 deg2. The sample has a median R magnitude of 19.5, and detects objects as faint as R = 22.6. Follow-up spectroscopy reveals that ∼85% of the candidates are bona fide emission-line objects, with roughly 60% of the real sources being lower-redshift objects (detection via Hα) and 40% being higher-redshift objects detected via [O III] emission or some other emission line. Here we present the results of our initial survey and follow-up spectroscopy. We use our sample to study the properties (including star-formation rates and metal abundances) of low-luminosity star-forming galaxies in the nearby universe and of low-metallicity star-forming galaxies at z ~ 0.33.

Abstract Copyright: ∼

Journal keyword(s): galaxies: abundances - galaxies: dwarf - galaxies: starburst - surveys

VizieR on-line data: <Available at CDS (J/AJ/143/145): table2.dat table3.dat table4.dat>

Nomenclature: Tables 2-4: [KSW2012] NNN (Nos 1-61).

Simbad objects: 56

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Number of rows : 56
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 [KSW2012] 46 G 00 38 16.1 +26 59 31       18.81   ~ 1 0
2 SDSS J003927.86+260428.8 AG? 00 39 27.861 +26 04 28.81           ~ 7 0
3 [KSW2012] 47 EmG 00 40 37.97 +27 02 30.9       21.83   ~ 3 0
4 AGC 102264 G 00 40 54.3 +26 57 21       17.98   ~ 2 0
5 [KSW2012] 49 EmG 00 41 02.83 +25 27 43.2       18.44   ~ 2 0
6 [KSW2012] 15 G 00 42 55.6 +25 51 26       19.84   ~ 2 0
7 [KSW2012] 51 EmG 00 43 52.44 +26 08 57.7       19.84   ~ 2 0
8 [KSW2012] 16 AG? 00 45 14.2 +27 27 14       18.28   ~ 2 0
9 SDSS J004713.21+264024.7 QSO 00 47 13.2140903688 +26 40 24.689384004       20.30   ~ 8 0
10 [KSW2012] 53 G 00 49 44.9 +27 07 52       17.57   ~ 2 0
11 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
12 [KSW2012] 55 G 01 44 40.3 +27 54 35       22.38   ~ 3 0
13 [KSW2012] 56 G 01 44 46.0 +28 03 03       20.42   ~ 2 0
14 [KSW2012] 17 QSO 01 44 47.1887148360 +27 16 38.830691712       19.84   ~ 1 0
15 [KSW2012] 57 G 01 47 12.8 +28 01 38       21.76   ~ 2 0
16 [KSW2012] 18 G 01 50 37.7 +27 33 43       18.37   ~ 1 0
17 [KSW2012] 58 G 02 23 33.2 +25 32 43       19.23   ~ 1 0
18 [KSW2012] 59 G 02 24 01.6 +25 28 17       21.12   ~ 2 0
19 [KSW2012] 60 HII 02 28 33.7 +25 19 51       17.66   ~ 1 0
20 [KSW2012] 61 G 02 31 01.6 +26 33 23       22.05   ~ 2 0
21 [KSW2012] 19 G 02 34 34.2 +27 16 54       20.96   ~ 2 0
22 [KSW2012] 20 G 02 38 50.1 +27 47 43       18.25   ~ 2 0
23 Z 505-29 GiG 02 38 51.8065325424 +27 50 50.091858024   14.4       ~ 72 0
24 [KSW2012] 21 Sy2 02 39 04.2 +27 52 37       19.44   ~ 1 0
25 [KSW2012] 22 G 02 39 12.6 +27 52 02       20.89   ~ 3 0
26 [KSW2012] 2 G 08 47 15.3 +10 02 30       18.61   ~ 2 0
27 [KSW2012] 3 G 08 47 17.6 +10 02 37       19.23   ~ 1 0
28 LEDA 1373744 AG? 08 47 17.8947373368 +10 02 33.823346460   16.27 15.25 17.12   ~ 12 0
29 [KSW2012] 5 Sy2 10 36 59.6 +12 06 08       19.90   ~ 1 0
30 [KSW2012] 6 G 10 37 09.5 +12 14 57       20.72   ~ 2 0
31 [KSW2012] 7 G 10 37 11.2 +12 07 48       22.64   ~ 2 0
32 [KSW2012] 24 G 10 37 11.3 +12 07 49       22.64   ~ 1 0
33 SDSS J104906.62+121647.7 QSO 10 49 06.6167536560 +12 16 47.800179516       19.49   ~ 7 0
34 [KSW2012] 8 G 11 40 48.8 +13 07 40       15.90   ~ 1 0
35 [KSW2012] 30 Sy2 11 41 55.26 +15 56 38.3       19.57   ~ 3 0
36 [KSW2012] 28 G 12 01 23.7 +14 00 40       22.13   ~ 2 0
37 [KSW2012] 10 AG? 12 16 55.3 +12 50 07       18.33   ~ 2 0
38 [KSW2012] 11 G 12 39 00.4 +13 23 55       21.18   ~ 1 0
39 [KSW2012] 12 G 12 50 55.3 +12 01 31       18.06   ~ 2 0
40 [KSW2012] 13 AG? 12 59 59.9 +13 36 45       18.24   ~ 2 0
41 [KSW2012] 31 G 13 57 05.3 +14 04 51       19.07   ~ 2 0
42 [KSW2012] 32 AG? 14 04 57.9 +12 09 19       18.17   ~ 2 0
43 [KSW2012] 33 G 14 05 24.6 +12 10 16       17.58   ~ 1 0
44 LEDA 1445060 AG? 14 30 43.68325 +13 57 08.5002       17.45   ~ 6 0
45 [KSW2012] 35 AG? 16 04 17.0 +11 37 33       17.99   ~ 2 0
46 SDSS J160521.54+134205.9 QSO 16 05 21.5482144848 +13 42 05.911740936   19.68 19.29 18.56   ~ 17 0
47 [KSW2012] 37 G 16 08 37.1 +11 59 01       20.09   ~ 2 0
48 [KSW2012] 38 Sy2 16 26 22.7 +11 29 04       18.91   ~ 1 0
49 [KSW2012] 39 G 16 26 43.8 +11 37 52       19.47   ~ 1 0
50 [KSW2012] 40 G 16 26 44.2 +11 37 46       20.45   ~ 2 0
51 Z 80-31 GiG 16 26 46.692 +11 34 48.63   15.0       ~ 88 0
52 LEDA 1396725 AG? 16 26 53.4836145576 +11 39 07.046820684       15.83   ~ 12 0
53 [KSW2012] 42 Sy2 16 27 04.6 +11 37 48       19.26   ~ 1 0
54 SDSS J231156.15+272210.8 Sy2 23 11 56.160 +27 22 10.88       18.84   ~ 4 0
55 [KSW2012] 43 EmG 23 18 43.19 +26 13 32.5       18.59   ~ 4 0
56 [KSW2012] 44 G 23 21 17.8 +27 54 32       18.29   ~ 1 0

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