2018A&A...620A.126M


Query : 2018A&A...620A.126M

2018A&A...620A.126M - Astronomy and Astrophysics, volume 620A, 126-126 (2018/12-1)

Mirach's Goblin: Discovery of a dwarf spheroidal galaxy behind the Andromeda galaxy.

MARTINEZ-DELGADO D., GREBEL E.K., JAVANMARDI B., BOSCHIN W., LONGEARD N., CARBALLO-BELLO J.A., MAKAROV D., BEASLEY M.A., DONATIELLO G., HAYNES M.P., FORBES D.A. and ROMANOWSKY A.J.

Abstract (from CDS):


Context. It is of broad interest for galaxy formation theory to carry out a full inventory of the numbers and properties of dwarf galaxies, both satellite and isolated, in the Local Volume.
Aims. Ultra-deep imaging in wide areas of the sky with small amateur telescopes can help to complete the census of these hitherto unknown low-surface-brightness galaxies, which cannot be detected by the current resolved stellar population and HI surveys. We report the discovery of Donatiello I, a dwarf spheroidal galaxy located one degree from the star Mirach (β And) in a deep image taken with an amateur telescope.
Methods. The color-magnitude diagram (CMD) obtained from follow-up observations obtained with the Gran Telescopio Canarias (La Palma, Spain) reveals that this system is beyond the local group and is mainly composed of old stars. The absence of young stars and HI emission in the ALFALFA survey is typical of quenched dwarf galaxies. Our photometry suggests a distance modulus for this galaxy of (m-M)=27.6±0.2 (3.3Mpc), although this distance cannot yet be established securely owing to the crowding effects in our CMD. At this distance, the absolute magnitude (MV=-8.3), surface brightness (µV=26.5mag/arcsec2), and stellar content of Donatiello I are similar to the "classical" Milky Way companions Draco or Ursa Minor.
Results. The projected position and distance of Donatiello I are consistent with this object being a dwarf satellite of the closest S0-type galaxy NGC 404 ("Mirach's Ghost"). Alternatively, it could be one of the most isolated quenched dwarf galaxies reported so far behind the Andromeda galaxy.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: individual: Donatiello I - galaxies: dwarf - galaxies: photometry - galaxies: structure

Nomenclature: NAME Donatiello I Dwarf Galaxy = NAME Do I Dwarf Galaxy.

Simbad objects: 25

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Number of rows : 25
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 NAME Andromeda XVIII G 00 02 14.5 +45 05 20     16.0     ~ 111 0
2 NGC 55 GiG 00 14 53.602 -39 11 47.86 8.54 8.58 7.87 7.84   ~ 748 2
3 And XIX G 00 19 32.10 +35 02 37.1     15.6     ~ 137 0
4 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 220 0
5 [KK2000] 3 GrG 00 36 42 -27 49.0           ~ 5 0
6 M 31 G 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 12100 1
7 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 10535 1
8 IC 1613 GiC 01 04 54.2 +02 08 00   10.42 10.01 9.77   ~ 1188 2
9 NGC 404 LIN 01 09 27.1 +35 43 05   12.56 11.73     ~ 446 0
10 * bet And PM* 01 09 43.92388 +35 37 14.0075 5.58 3.62 2.05 0.81 -0.19 M0+IIIa 545 0
11 NAME Donatiello I Dwarf Galaxy G 01 11 40.37 +34 36 03.2           ~ 2 0
12 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 5607 1
13 NAME Phoenix Dwarf Galaxy Sy1 01 51 06.3 -44 26 41   13.48 13.2 12.69   ~ 508 2
14 UGC 1703 LSB 02 12 55.14 +32 48 48.9   18       ~ 23 0
15 NGC 2403 AGN 07 36 51.3381434280 +65 36 09.650825640 9.31 8.84 8.38 8.19   ~ 1722 1
16 IC 3104 G 12 18 46.1 -79 43 33   13.65 12.8 12.04   ~ 79 1
17 NAME LOCAL SUPERCL SCG 12 31 +12.4           ~ 496 0
18 NAME UMi Galaxy G 15 09 11.34 +67 12 51.7   13.60 10.6     ~ 1291 0
19 LEDA 2801026 LSB 16 13 47.504 +54 22 08.25     15.9     ~ 102 0
20 [TSK2008] 230 GrG 16 13 47.7 +54 22 15           ~ 3 0
21 NAME Dra dSph G 17 20 14.335 +57 55 16.39   12.40 10.6     ~ 1273 1
22 ESO 468-20 G 22 40 43.6 -30 47 55   15.88   15.13   ~ 39 0
23 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 286 0
24 NAME APPLES 1 G 23 15 03.3 -42 32 22           ~ 16 0
25 NAME Local Group GrG ~ ~           ~ 7897 0

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2023.02.01-19:13:27

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