2015ApJ...802L..18L

Query : 2015ApJ...802L..18L

2015ApJ...802L..18L - Astrophys. J., 802, L18 (2015/April-1)

A new faint Milky Way satellite discovered in the Pan-STARRS1 3π survey.

LAEVENS B.P.M., MARTIN N.F., IBATA R.A., RIX H.-W., BERNARD E.J., BELL E.F., SESAR B., FERGUSON A.M.N., SCHLAFLY E.F., SLATER C.T., BURGETT W.S., CHAMBERS K.C., FLEWELLING H., HODAPP K.A., KAISER N., KUDRITZKI R.-P., LUPTON R.H., MAGNIER E.A., METCALFE N., MORGAN J.S., PRICE P.A., TONRY J.L., WAINSCOAT R.J. and WATERS C.

Abstract (from CDS):

We present the discovery of a faint Milky Way satellite, Laevens 2/Triangulum II, found in the Panoramic Survey Telescope And Rapid Response System 3π imaging data and confirmed with follow-up wide-field photometry from the Large Binocular Cameras. The stellar system, with an absolute magnitude of MV= -1.8±0.5, a heliocentric distance of 30–22 kpc, and a half-mass-radius of 34 –8+9 pc, shows remarkable similarity to faint, nearby, small satellites such as Willman 1, Segue 1, Segue 2, and Boötes II. The discovery of Laevens 2/Triangulum II further populates the region of parameter space for which the boundary between dwarf galaxies and globular clusters becomes tenuous. Follow-up spectroscopy will ultimately determine the nature of this new satellite, whose spatial location hints at a possible connection with the complex Triangulum-Andromeda stellar structures.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - Galaxy: structure - globular clusters: general - Local Group

Nomenclature: NAME Laevens 2/Triangulum II = NAME Lae 2/Tri II.

Simbad objects: 16

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Number of rows : 16
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 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
3 NAME Tri II G 02 13 17.40 +36 10 42.4           ~ 164 0
4 NAME Segue 2 G 02 19 16.0 +20 10 31     15.2     ~ 299 0
5 NAME Sagittarius Stream St* 02 22 +00.0           ~ 1001 0
6 NAME Segue 1 G 10 07 03.2 +16 04 25     15.3     ~ 517 1
7 NAME Willman 1 G 10 49 21.0 +51 03 00     15.2     ~ 345 0
8 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
9 NAME Bootes II G 13 58 00.0 +12 51 00     15.4     ~ 269 0
10 M 92 GlC 17 17 07.39 +43 08 09.4     6.52     ~ 2240 0
11 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
12 NAME Orphan Stream St* 19 09 -23.           ~ 281 0
13 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
14 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0
15 NAME Local Group GrG ~ ~           ~ 9325 0
16 NAME Triangulum-Andromeda Region reg ~ ~           ~ 89 0

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