2016A&A...588A..89J


Query : 2016A&A...588A..89J

2016A&A...588A..89J - Astronomy and Astrophysics, volume 588A, 89-89 (2016/4-1)

DGSAT: Dwarf Galaxy Survey with Amateur Telescopes.

JAVANMARDI B., MARTINEZ-DELGADO D., KROUPA P., HENKEL C., CRAWFORD K., TEUWEN K., GABANY R.J., HANSON M., CHONIS T.S. and NEYER F.

Abstract (from CDS):

Context. We introduce the Dwarf Galaxy Survey with Amateur Telescopes (DGSAT) project and report the discovery of eleven low surface brightness (LSB) galaxies in the fields of the nearby galaxies NGC 2683, NGC 3628, NGC 4594 (M 104), NGC 4631, NGC 5457 (M 101), and NGC 7814.
Aims. The DGSAT project aims to use the potential of small-sized telescopes to probe LSB features around large galaxies and to increase the sample size of the dwarf satellite galaxies in the Local Volume.
Methods. Using long exposure images, fields of the target spiral galaxies are explored for extended LSB objects. After identifying dwarf galaxy candidates, their observed properties are extracted by fitting models to their light profiles.
Results. We find three, one, three, one, one, and two new LSB galaxies in the fields of NGC 2683, 3628, 4594, 4631, 5457, and 7814, respectively. In addition to the newly found galaxies, we analyse the structural properties of nine already known galaxies. All of these 20 dwarf galaxy candidates have effective surface brightnesses in the range 25.3<=µe<=28.8mag/arcsec2 and are fit with Sersic profiles with indices n<=1. Assuming that they are in the vicinity of the above mentioned massive galaxies, their r-band absolute magnitudes, their effective radii, and their luminosities are in the ranges -15.6<=Mr<=-7.8, 160pc<=Re<=4.1kpc, and 0.1x106<=(L/L☉)r<=127x106, respectively. To determine whether these LSB galaxies are indeed satellites of the above mentioned massive galaxies, their distances need to be determined via further observations.
Conclusions. Using small telescopes, we are readily able to detect LSB galaxies with similar properties to the known dwarf galaxies of the Local Group.

Abstract Copyright: © ESO, 2016

Journal keyword(s): galaxies: dwarf - galaxies: formation - galaxies: fundamental parameters - galaxies: statistics - galaxies: structure

Nomenclature: Table 3: [JMK2016] NGC NNNN-DGSAT-N N=15.

Simbad objects: 33

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Number of rows : 33
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 [JMK2016] NGC 7814-DGSAT-2 LSB 00 03 06.80 +16 18 33.3           ~ 2 0
2 NGC 7814 GiG 00 03 14.947 +16 08 42.82   12.0       ~ 279 0
3 [JMK2016] NGC 7814-DGSAT-1 LSB 00 03 24.00 +16 11 13.6           ~ 1 0
4 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12112 1
5 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5612 1
6 NGC 2683 AGN 08 52 41.3064829584 +33 25 18.597681516 11.57 10.68 9.79 9.38   ~ 422 1
7 [JMK2016] NGC 2683-DGSAT-5 LSB 08 52 48.10 +32 49 37.7           ~ 1 0
8 LEDA 166095 G 08 52 50.8 +33 47 52   16.8       ~ 23 0
9 [JMK2016] NGC 2683-DGSAT-4 LSB 08 54 20.00 +33 14 49.1           ~ 1 0
10 [JMK2016] NGC 2683-DGSAT-3 LSB 08 55 10.90 +33 36 45.7           ~ 1 0
11 [KK98a] 70 G 08 55 22.0 +33 33 33   17.7       ~ 13 0
12 M 81 Sy2 09 55 33.1726556496 +69 03 55.062505368   7.89 6.94     ~ 4269 3
13 NGC 3628 GiP 11 20 17.018 +13 35 22.16   10.42 9.48 9.22   ~ 801 3
14 SDSS J112101.18+133629.2 Cl* 11 21 01.1839266048 +13 36 29.292189012           ~ 6 0
15 [JMK2016] NGC 3628-DGSAT-1 LSB 11 21 37.00 +13 26 50.7           ~ 2 0
16 [JMK2016] NGC 4594-DGSAT-3 LSB 12 39 32.80 -11 13 38.5           ~ 3 0
17 [JMK2016] NGC 4594-DGSAT-2 LSB 12 39 51.60 -11 20 24.8           ~ 2 0
18 [JMK2016] NGC 4594-DGSAT-1 LSB 12 39 55.10 -11 44 38.4           ~ 3 0
19 M 104 LIN 12 39 59.43185902 -11 37 22.9961800 9.51 9.55 8.00 8.05   ~ 1352 3
20 [JMK2016] NGC 4631-DGSAT-3 LSB 12 41 08.00 +32 26 50.4           ~ 2 0
21 [JMK2016] NGC 4631-DGSAT-2 G 12 42 06.8 +32 37 15   18.5       ~ 4 0
22 NGC 4631 GiP 12 42 08.009 +32 32 29.44   9.78 9.19 9.10   ~ 1054 2
23 [JMK2016] NGC 4631-DGSAT-1 G 12 42 52.5 +32 27 35   19.7       ~ 4 0
24 [MVA2014] DF 3 LSB 14 03 05.7 +53 36 56   17.9       ~ 17 0
25 M 101 GiP 14 03 12.583 +54 20 55.50   8.46 7.86 7.76   ~ 2771 2
26 [MVA2014] DF 1 LSB 14 03 45.0 +53 56 40   18.9       ~ 15 0
27 [MVA2014] DF 7 LSB 14 05 47.50 +55 07 57.3   20.4       ~ 11 0
28 USNO-A2.0 1425-08068454 * 14 06 47.667 +53 44 21.71   15.4   14.9   ~ 1 0
29 [JMK2016] NGC 5457-DGSAT-1 LSB 14 06 49.80 +53 44 28.8   19.2       ~ 11 0
30 NGC 5485 LIN 14 07 11.3594809920 +55 00 06.084219996 14.34 13.82 12.22     ~ 238 0
31 [MVA2014] DF 4 LSB 14 07 33.80 +54 42 39.2   18.8       ~ 12 0
32 [MVA2014] DF 6 LSB 14 08 18.70 +55 11 30.6   20.1       ~ 10 0
33 NAME Local Group GrG ~ ~           ~ 7912 0

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2023.02.09-10:59:17

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