2002A&A...390..439M

Query : 2002A&A...390..439M

2002A&A...390..439M - Astronomy and Astrophysics, volume 390439-448 (2002/8-1)

A QSO survey via optical variability and zero proper motion in the M92 field. III. Narrow emission line galaxies.

MEUSINGER H. and BRUNZENDORF J.

Abstract (from CDS):

We study a sample of 23 narrow-emission line galaxies (NELGs) which were selected by their strong variability as QSO candidates in the framework of a variability-and-proper motion QSO survey on digitised Schmidt plates. In previous work, we have shown that variability is an efficient method to find AGNs. The variability properties of the NELGs are however significantly different from those of the QSOs. The main aim of this paper is to clarify the nature of this variability and to estimate the fraction of AGN-dominated NELGs in this sample. New photometric and spectroscopic observations are presented, along with revised data from the photographic photometry. The originally measured high variability indices could not be confirmed. The diagnostic line-ratios of the NELG spectra are consistent with HII region-like spectra. No AGN could be proved, yet we cannot rule out the existence of faint low-luminosity AGNs masked by HII regions from intense star formation.

Abstract Copyright: ∼

Journal keyword(s): galaxies: active - galaxies: starburst - quasars: emission lines

Nomenclature: Table 1: [MB2002] NN (Nos 1-23) = [MB2002] NELG JHHMMSS.s+DDMMSS N=23.

Simbad objects: 32

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Number of rows : 32
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 NGC 2363A HII 07 28 42.8 +69 11 21           ~ 588 3
2 NGC 2366 H2G 07 28 52.4529 +69 12 38.859 12.25 11.86 11.39 11.33   ~ 801 0
3 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4725 3
4 NGC 5678 SyG 14 32 05.5700264952 +57 55 17.155392060   12.10       ~ 240 1
5 [MB2002] 1 EmG 17 11 22.0 +44 07 21           ~ 1 0
6 [MB2002] NELG J171124.1+433117 EmG 17 11 24.1 +43 31 17           ~ 1 0
7 [MB2002] NELG J171241.1+430512 EmG 17 12 41.1 +43 05 12           ~ 1 0
8 NGC 6323 GiG 17 13 18.0454114728 +43 46 56.772281424   14.8       ~ 103 1
9 [MB2002] NELG J171319.5+435216 EmG 17 13 19.5 +43 52 16           ~ 1 0
10 SDSS J171323.00+431229.8 EmG 17 13 23.00487 +43 12 29.8452           ~ 2 0
11 [MB2002] NELG J171326.8+440117 EmG 17 13 26.8 +44 01 17           ~ 1 0
12 [MB2002] NELG J171448.3+434455 EmG 17 14 48.3 +43 44 55           ~ 1 0
13 [MB2002] 8 EmG 17 14 59.0 +43 43 27           ~ 1 0
14 [MB2002] NELG J171510.7+430506 EmG 17 15 10.7 +43 05 06           ~ 1 0
15 [MB2002] NELG J171520.1+433427 EmG 17 15 20.1 +43 34 27           ~ 1 0
16 [MB2002] NELG J171610.9+422333 EmG 17 16 10.9 +42 23 33           ~ 1 0
17 [MB2002] NELG J171652.4+433528 EmG 17 16 52.4 +43 35 28           ~ 1 0
18 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
19 2MASX J17173418+4328310 EmG 17 17 34.1684481408 +43 28 31.066410648           ~ 1 0
20 [MB2002] NELG J171734.9+425643 EmG 17 17 34.9 +42 56 43           ~ 1 0
21 [MB2002] NELG J171747.3+432550 EmG 17 17 47.3 +43 25 50           ~ 1 0
22 [MB2002] NELG J171828.1+442727 EmG 17 18 28.1 +44 27 27           ~ 1 0
23 [MB2002] NELG J171908.9+423111 EmG 17 19 08.9 +42 31 11           ~ 1 0
24 [MB2002] NELG J171955.6+442244 EmG 17 19 55.6 +44 22 44           ~ 1 0
25 [MB2002] 19 EmG 17 21 56.0 +44 19 12           ~ 1 0
26 [MB2002] NELG J172256.1+425447 EmG 17 22 56.1 +42 54 47           ~ 1 0
27 [MB2002] NELG J172340.6+434102 EmG 17 23 40.6 +43 41 02           ~ 1 0
28 [MB2002] NELG J172348.1+432907 EmG 17 23 48.1 +43 29 07           ~ 1 0
29 [MB2002] NELG J172407.6+424037 EmG 17 24 07.6 +42 40 37           ~ 1 0
30 NGC 6500 LIN 17 55 59.78218885 +18 20 17.6673590   13.43 12.54     ~ 232 1
31 NGC 7177 LIN 22 00 41.250 +17 44 17.22   12.2       ~ 204 1
32 NGC 7743 Sy2 23 44 21.1607807112 +09 56 02.970989664   14.19 13.28     ~ 334 0

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