2009A&A...500..833Y


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.07CET20:11:41

2009A&A...500..833Y - Astronomy and Astrophysics, volume 500, 833-843 (2009/6-3)

Molecular gas and a new young stellar cluster in the far outer galaxy.

YUN J.L., ELIA D., PALMEIRIM P.M., GOMES J.I. and MARTINS A.M.

Abstract (from CDS):

We investigate the star-formation ocurring in the region towards IRAS 07527-3446 in the molecular cloud [MAB97]250.63-3.63, in the far outer Galaxy. We report the discovery of a new young stellar cluster, and describe its properties and those of its parent molecular cloud. Near-infrared JHKS images were obtained with VLT/ISAAC, and millimetre line CO spectra were obtained with the SEST telescope. VLA archive date were also used. The cloud and cluster are located at a distance of 10.3kpc and a Galactocentric distance of 15.4kpc, in the far outer Galaxy. Morphologically, IRAS 07527-3446 appears as a young embedded cluster of a few hundred stars seen towards the position of the IRAS source, extending for about 2-4pc and exhibiting sub-clustering. The cluster contains low and intermediate-mass young reddened stars, a large fraction having cleared the inner regions of their circumstellar discs responsible for (H-KS) colour excess. The observations are compatible with a≤5Myr cluster with variable spatial extinction of between AV=5 and AV=11. Decomposition of CO emission in clumps, reveals a clump clearly associated with the cluster position, of mass 3.3x103M. Estimates of the slopes of the KS-band luminosity function and of the star-formation efficiency yield values similar to those seen in nearby star-formation sites. These findings reinforce previous results that the distant outer Galaxy continues to be active in the production of new and rich stellar clusters, with the physical conditions required for the formation of rich clusters continuing to be met in the very distant environment of the outer Galactic disc.

Abstract Copyright:

Journal keyword(s): stars: formation - ISM: clouds - ISM: individual objects: IRAS 07527-3446 - infrared: stars - ISM: dust, extinction - stars: pre-main sequence

CDS comments: Fig.2 IRAS 07527-3342 and Fig.3 IRAS 07257-3446 are probable misprint for IRAS 07527-3446.

Simbad objects: 12

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Number of rows : 12

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3333 0
2 LDN 1630 DNe 05 45.5 -00 59           ~ 346 0
3 2MASX J06383916-0144497 Cl* 06 38 39.170 -01 44 49.76           ~ 5 0
4 IRAS 07255-2012 FIR 07 27 44.0 -20 19 03           ~ 3 0
5 [MAB97] 250.63-3.63 MoC 07 54.2 -34 53           ~ 2 0
6 IRAS 07527-3446 FIR 07 54 37.1960980954 -34 54 50.309246642           ~ 2 0
7 HD 64876 * 07 54 39.9166064273 -34 50 48.161189309 9.48 7.66 6.12     K4III 10 0
8 QSO B0826-373 QSO 08 28 04.78022012 -37 31 06.2809892   16       ~ 38 0
9 GSPC P545-C * 08 29 25.1181719843 +05 56 08.410122023           ~ 11 0
10 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3626 1
11 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11077 0
12 [PMK98] 9187 * 23 23 34.3305573768 -15 21 09.420236697           ~ 7 0

    Equat.    Gal    SGal    Ecl

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2019.12.07-20:11:41

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