2013ApJ...778...92Y

Query : 2013ApJ...778...92Y

2013ApJ...778...92Y - Astrophys. J., 778, 92 (2013/December-1)

Intrinsically polarized stars and implication for star formation in the central parsec of our Galaxy.

YOSHIKAWA T., NISHIYAMA S., TAMURA M., ISHII M. and NAGATA T.

Abstract (from CDS):

We have carried out adaptive-optics assisted observations at the Subaru Telescope and have found 11 intrinsically polarized sources in the central parsec of our Galaxy. They are selected from 318 point sources with KS < 15.5, and their interstellar polarizations are corrected using a Stokes Q/I-U/I diagram. Considering brightness, near-infrared color excess, and the amount of intrinsic polarization, two of them are good young stellar object (YSO) candidates with an age of ∼105 yr. If they are genuine YSOs, their existence provides strong constraints on star formation mechanisms in this region. In the remaining sources, two are known as bow-shock sources in the Northern Arm. One other is also located in the Northern Arm and shows very similar properties, and thus it is likely to be a so far unknown bow-shock source. The origin of the intrinsic polarization of the other sources is as yet uncertain.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: center - polarization - stars: formation - stars: pre-main sequence

Nomenclature: Table 1: [YNT2013] NN (Nos 1-11).

CDS comments: [BSE2009] 275 and [BSE2009] 458 are not in SIMBAD.

Simbad objects: 23

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Number of rows : 23
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 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
2 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
3 [YNT2013] 11 * 17 45 39.77 -29 00 32.2           ~ 1 0
4 [YNT2013] 10 * 17 45 39.77 -29 00 29.0           ~ 1 0
5 GCIRS 2L * 17 45 39.778 -29 00 32.11           ~ 30 0
6 GCIRS 13N * 17 45 39.812 -29 00 29.16           ~ 44 0
7 [YNT2013] 9 * 17 45 39.93 -29 00 28.6           ~ 1 0
8 [YNT2013] 8 * 17 45 39.98 -29 00 24.1           ~ 1 0
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 4970 3
10 [YNT2013] 7 * 17 45 40.10 -29 00 25.8           ~ 1 0
11 GCIRS 8 * 17 45 40.14 -28 59 58.7           O 72 0
12 GCIRS 21 WR* 17 45 40.222 -29 00 30.85           WC9 104 0
13 [YNT2013] 6 * 17 45 40.23 -29 00 30.9           ~ 1 0
14 [YNT2013] 5 * 17 45 40.36 -29 00 35.7           ~ 1 0
15 [YNT2013] 4 * 17 45 40.38 -29 00 23.0           ~ 1 0
16 GCIRS 1W Em* 17 45 40.442 -29 00 27.51           Be? 109 0
17 GCIRS 10W * 17 45 40.5305 -29 00 23.001           ~ 50 0
18 [YNT2013] 3 * 17 45 40.54 -29 00 22.8           ~ 1 0
19 [YNT2013] 2 * 17 45 40.57 -29 00 28.6           ~ 1 0
20 GCIRS 5 * 17 45 40.700 -29 00 18.51           ~ 57 0
21 USNO-A2.0 0600-28577051 * 17 45 40.7177175696 -29 00 11.333875968   15.8   14.0   ~ 21 0
22 [YNT2013] 1 * 17 45 40.77 -29 00 19.6           ~ 1 0
23 GCIRS 7E2 * ~ ~           ~ 14 0

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