2009A&A...495..447H

Query : 2009A&A...495..447H

2009A&A...495..447H - Astronomy and Astrophysics, volume 495447-455 (2009/2-4)

Emission line objects in NGC6822. New planetary nebula candidates.

HERNANDEZ-MARTINEZ L. and PENA M.

Abstract (from CDS):

Images obtained with the CTIO 4-m telescope and the MOSAIC-2 wide field camera in [OIII]5007 and Hα on-band and off-band filters are analyzed to search for emission line objects in the dwarf galaxy NGC6822. In particular we search for planetary nebula (PN) candidates. In addition, imaging and spectroscopy of a sub-sample of objects obtained with the ESO VLT and FORS2 spectrograph are used to calibrate the MOSAIC imaging. In the continuum-subtracted images, a large number of line emission regions were detected, for which we measured instrumental magnitudes in all the filters. The [OIII]5007 and Hα+[NII] magnitudes were calibrated with the spectroscopy. Based upon some criteria to distinguish between PNe and compact HII regions, we have found 26 PN candidates, increasing the known sample by 8 objects. Also we detected a number of compact HII regions and about 20 stellar-like objects emitting in Hα. For all the objects we present coordinates, instrumental magnitudes and nebular [OIII] and Hα+[NII] fluxes. The observed luminosity function for the PN [OIII]5007 magnitudes (PNLF) and the cumulative PNLF were calculated. We confirm that the PNLF presents a dip similar to the one detected for the Small Magellanic Cloud at 2.5 mag below the maximum. The cumulative PNLF returns a value M*5007=-3.71+0.21–0.42 for the peak absolute magnitude of the PNLF which is faint (but within uncertainties) compared to the value expected for galaxies with a metallicity similar to that of NGC6822. From our best fit to the observed PNLF we obtained a rough estimate of the distance modulus m-M=23.64+0.23–0.43mag, which agrees within uncertainties with recent values from Cepheid stars reported in the literature. Also the number of PNe in the brightest 0.5mag, normalized to the galactic bolometric luminosity, was estimated to be α0.5~(3.8+0.90–0.71)E-9. This number is similar to the values derived for galaxies with recent star formation and small galaxies (MB fainter than -18mag) and larger than the values for early-type galaxies.

Abstract Copyright: ∼

Journal keyword(s): ISM: HII regions - ISM: planetary nebulae: general - galaxies: individual: NGC 6822 (DDO 209)

VizieR on-line data: <Available at CDS (J/A+A/495/447): table2.dat>

Nomenclature: Table 2: [HP2009] PN NN (Nos 1-26), [HP2009] HII NN (Nos 1-25), [HP2009] Ha NN (Nos 1-21).

Simbad objects: 79

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Number of rows : 79
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 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 NGC 3109 AG? 10 03 06.877 -26 09 34.46 11.10 10.42 10.04 9.91   ~ 825 2
4 CD-38 10980 WD* 16 23 33.8380498896 -39 13 46.161043572 9.916 10.885 11.029 10.936 10.841 DA2 526 0
5 [HP2009] PN 6 PN 19 44 02.29 -14 42 43.3           ~ 7 0
6 [HP2009] HII 10 HII 19 44 13.81 -14 44 46.9           ~ 1 0
7 [HP2009] HII 1 HII 19 44 30.74 -14 41 37.8           ~ 1 0
8 [HP2009] HII 16 HII 19 44 30.88 -14 48 26.3   17.88 17.48     ~ 12 0
9 [HP2009] PN 13 PN 19 44 31.27 -14 47 14.9           ~ 3 0
10 [HP2009] HII 3 HII 19 44 32.54 -14 42 23.8           ~ 1 0
11 [HP2009] HII 14 HII 19 44 32.99 -14 47 31.6   18.38 17.95     ~ 11 0
12 [HP2009] PN 1 PN? 19 44 35.45 -14 40 50.5           ~ 1 0
13 [HP2009] Ha 2 EmO 19 44 39.10 -14 41 25.7           ~ 1 0
14 [HP2009] Ha 3 EmO 19 44 40.62 -14 42 40.7           ~ 1 0
15 KD S10 HII 19 44 42.57 -14 50 32.2           ~ 6 0
16 [HP2009] PN 23 PN 19 44 44.22 -14 50 46.4           ~ 5 0
17 [HP2009] PN 24 PN 19 44 45.59 -14 52 37.0           ~ 3 0
18 [HP2009] HII 8 HII 19 44 48.41 -14 43 58.6           ~ 1 0
19 [HP2009] HII 13 HII 19 44 48.69 -14 46 15.0           ~ 1 0
20 [HP2009] PN 7 PN 19 44 49.11 -14 43 00.6           ~ 5 0
21 [HP2009] PN 16 PN 19 44 49.52 -14 48 03.5           ~ 12 0
22 [LCM2005] PN 14 PN? 19 44 49.59 -14 46 31.3           ~ 7 0
23 [HP2009] Ha 12 EmO 19 44 50.12 -14 50 35.2           ~ 1 0
24 [HP2009] HII 19 HII 19 44 50.60 -14 52 29.8           ~ 1 0
25 [HP2009] HII 20 HII 19 44 50.80 -14 52 53.5           ~ 1 0
26 [HP2009] PN 21 PN 19 44 50.90 -14 49 13.8           ~ 6 0
27 [HP2009] PN 18 PN 19 44 51.79 -14 48 15.7           ~ 4 0
28 [HP2009] PN 5 PN 19 44 52.02 -14 42 18.0           ~ 4 0
29 [HP2009] HII 6 HII 19 44 52.14 -14 42 58.1           ~ 3 0
30 [HP2009] HII 5 HII 19 44 52.31 -14 42 50.6           ~ 3 0
31 [HP2009] HII 7 HII 19 44 53.99 -14 43 12.5           ~ 1 0
32 [HP2009] Ha 7 EmO 19 44 54.04 -14 46 20.0           ~ 1 0
33 [HP2009] HII 4 HII 19 44 54.52 -14 42 44.4           ~ 3 0
34 [HP2009] HII 17 HII 19 44 55.79 -14 50 31.3           ~ 1 0
35 [HP2009] Ha 19 EmO 19 44 55.91 -14 55 06.4           ~ 1 0
36 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
37 [HP2009] HII 2 HII 19 44 56.80 -14 42 07.9           ~ 3 0
38 [HP2009] PN 10 PN 19 44 56.93 -14 45 18.6           ~ 8 0
39 [LCM2005] HII 8 HII 19 44 57.15 -14 47 50.0           ~ 10 0
40 [HP2009] HII 9 HII 19 44 58.50 -14 44 45.7           ~ 3 0
41 [HP2009] PN 9 PN? 19 44 58.77 -14 44 14.7           ~ 2 0
42 [HP2009] PN 22 PN? 19 44 58.90 -14 49 31.0           ~ 2 0
43 [HP2009] PN 17 PN 19 44 59.73 -14 48 07.2           ~ 5 0
44 [HP2009] PN 15 PN? 19 45 00.59 -14 48 04.6           ~ 2 0
45 [HP2009] PN 11 PN? 19 45 00.74 -14 46 28.9           ~ 2 0
46 [HP2009] Ha 6 EmO 19 45 01.36 -14 44 23.9           ~ 1 0
47 [LCM2005] PN 4 PN? 19 45 01.53 -14 41 36.3           ~ 8 0
48 [HP2009] HII 12 HII 19 45 01.58 -14 46 05.6           ~ 1 0
49 [HP2009] Ha 17 EmO 19 45 01.90 -14 52 55.9           ~ 1 0
50 [HP2009] PN 3 PN? 19 45 02.70 -14 41 36.0           ~ 1 0
51 [HP2009] Ha 20 EmO 19 45 04.16 -14 55 57.4           ~ 1 0
52 [HP2009] HII 23 HII 19 45 04.60 -14 57 31.7           ~ 1 0
53 [HP2009] Ha 4 EmO 19 45 05.02 -14 44 14.8           ~ 1 0
54 [HP2009] PN 19 PN 19 45 06.44 -14 48 39.5   24.730 23.968     ~ 5 0
55 [HP2009] PN 14 PN 19 45 07.15 -14 47 31.4           ~ 14 0
56 [HP2009] Ha 10 EmO 19 45 07.24 -14 48 14.3           ~ 2 0
57 [HP2009] Ha 5 EmO 19 45 07.51 -14 44 22.2           ~ 2 0
58 [HP2009] PN 26 PN? 19 45 07.84 -14 55 50.3           ~ 2 0
59 [HP2009] Ha 8 EmO 19 45 07.95 -14 47 05.6           ~ 1 0
60 [HP2009] Ha 18 EmO 19 45 08.30 -14 53 22.0           ~ 1 0
61 [HP2009] HII 22 HII 19 45 08.44 -14 57 30.6           ~ 1 0
62 [HP2009] HII 21 HII 19 45 10.37 -14 54 30.4           ~ 1 0
63 [HP2009] PN 20 PN 19 45 11.50 -14 48 53.6           ~ 5 0
64 [HP2009] Ha 16 EmO 19 45 12.08 -14 52 08.6           ~ 1 0
65 [HP2009] HII 24 HII 19 45 12.90 -14 57 41.4           ~ 1 0
66 [HP2009] PN 25 PN? 19 45 13.36 -14 54 48.6           ~ 2 0
67 [HP2009] HII 25 HII 19 45 13.90 -14 58 47.2           ~ 1 0
68 [HP2009] Ha 13 EmO 19 45 14.11 -14 51 09.9           ~ 1 0
69 [HP2009] Ha 21 EmO 19 45 14.85 -14 58 37.2           ~ 1 0
70 [HP2009] HII 11 HII 19 45 17.09 -14 45 29.5           ~ 1 0
71 [HP2009] Ha 9 EmO 19 45 17.50 -14 47 27.6           ~ 1 0
72 [HP2009] Ha 11 EmO 19 45 28.73 -14 49 05.6           ~ 1 0
73 [HP2009] Ha 14 EmO 19 45 50.20 -14 51 11.3           ~ 1 0
74 [HP2009] Ha 15 EmO 19 45 51.05 -14 51 23.3           ~ 1 0
75 [HP2009] PN 2 PN 19 45 56.38 -14 40 50.5           ~ 4 0
76 [HP2009] Ha 1 EmO 19 45 59.21 -14 39 37.6           ~ 1 0
77 [HP2009] PN 8 PN 19 46 02.22 -14 43 42.2           ~ 4 0
78 LAWD 87 WD* 21 32 16.2327040616 +00 15 14.399267982 13.717 14.634 14.674 14.675 14.676 DB4 195 1
79 NAME Local Group GrG ~ ~           ~ 9325 0

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