2000ApJ...532..423K

Query : 2000ApJ...532..423K

2000ApJ...532..423K - Astrophys. J., 532, 423-429 (2000/March-3)

Discovery of young stellar objects at the edge of the optical disk of our galaxy.

KOBAYASHI N. and TOKUNAGA A.T.

Abstract (from CDS):

We report a discovery of young stellar objects associated with a molecular cloud at the edge of the optical disk of our Galaxy. This cloud is denoted as Cloud 2 in the list by Digel et al., and it is one of the most distant molecular clouds from the Galactic center known to date, with a probable distance of 15-19 kpc. We found seven red near-infrared (NIR) sources associated with this cloud. Based on our NIR observations and the far-infrared/radio data in the literature, we conclude that most sources are likely to be members of Cloud 2. The geometry of ionized gas, IRAS sources, NIR sources, and molecular cloud suggests that MR 1, an isolated early B-type star near Cloud 2, has triggered the star formation activity in Cloud 2. Our results show that ongoing star formation is present in Cloud 2 and that active star formation can occur in the farthest regions of the Galaxy, where the molecular gas density is extremely low, perturbation from the spiral arms is very small, and the metallicity is similar to that for irregular dwarf galaxies. Cloud 2 is an excellent laboratory in which to study the details of the star formation process in an environment that is similar to that in the early stage of the formation of the Galactic disk.

Abstract Copyright: ∼

Journal keyword(s): Galaxy: Stellar Content - Infrared: Stars - Stars: Formation

Nomenclature: Table 1: [KT2000] IRS N (Nos 1-7).

CDS comments: Cloud 2 = [DDT94] Cloud 2. Table 1: MR 1 = [MR74] 1.

Simbad objects: 21

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Number of rows : 21
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 2MASS J02482690+5823567 NIR 02 48 26.9070272856 +58 23 56.705524080           ~ 3 0
2 IRAS 02447+5811 FIR 02 48 28.0 +58 23 34           ~ 4 0
3 [KT2000] IRS 2 Cl* 02 48 28.89 +58 23 33.5           ~ 2 0
4 NAME Edge Cloud 2 MoC 02 48.5 +58 28           ~ 25 1
5 2MASS J02483524+5823362 Y*O 02 48 35.25 +58 23 36.2           ~ 2 0
6 2MASS J02484483+5823360 Y*O 02 48 44.8828008768 +58 23 35.902087404           ~ 2 0
7 IRAS 02450+5816 FIR 02 48 50.3 +58 29 28           ~ 6 0
8 2MASS J02485641+5829200 Y*O 02 48 56.4247941624 +58 29 20.033324016           ~ 2 0
9 IRAS 02455+5808 IR 02 49 21.0 +58 21 17           ~ 6 0
10 2MASS J02492120+5821283 NIR 02 49 21.20 +58 21 28.4           ~ 2 0
11 GSC 03712-01870 * 02 49 22.3046644368 +58 26 44.219776128 13.32 13.73 13.02     B 18 0
12 2MASS J02492403+5821154 NIR 02 49 24.0284079312 +58 21 15.440506272           ~ 2 0
13 HD 17484 SB* 02 49 26.9113845024 +37 19 35.078867148   6.870 6.448     F6III-IV 49 0
14 NAME Per Arm PoG 03 30 +45.0           ~ 1513 0
15 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4414 0
16 RAFGL 618 pA* 04 42 53.6242032600 +36 06 53.400902220   16.32   12.59   C-rich 1000 0
17 NAME Ori Complex Cld 05 35.3 -05 23           ~ 441 0
18 PN M 1-16 PN 07 37 18.902 -09 38 47.96   12.7       ~ 182 0
19 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3628 1
20 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 658 2
21 IRAS 22176+6303 Y*O 22 19 18.23 +63 18 47.5           ~ 595 0

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