2014A&A...567A.108M


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.10CEST02:51:04

2014A&A...567A.108M - Astronomy and Astrophysics, volume 567A, 108-108 (2014/7-1)

Rosette globulettes and shells in the infrared.

MAEKELAE M.M., HAIKALA L.K. and GAHM G.F.

Abstract (from CDS):

Giant galactic HII regions surrounding central young clusters show compressed molecular shells, which have broken up into clumps, filaments, and elephant trunks interacting with UV light from central OB stars. Tiny, dense clumps of subsolar mass, called globulettes, form in this environment. We observe and explore the nature and origin of the infrared emission and extinction in these cool, dusty shell features and globulettes in one HII region, the Rosette nebula, and search for associated newborn stars. We imaged the northwestern quadrant of the Rosette nebula in the near-infrared (NIR) through wideband JHKs filters and narrowband H2 1-0 S(1) and Pβ plus continuum filters using the Son of Isaac (SOFI) instrument at the New Technology Telescope (NTT) at European Southern Observatory (ESO). We used the NIR images to study the surface brightness of the globulettes and associated bright rims. We used the NIR JHKs photometry to create a visual extinction map and to search for objects with NIR excess emission. In addition, archival images from Spitzer Infrared Array Camera (IRAC) and Multiband Imaging Photometer for Spitzer (MIPS) 24µm and Herschel Photoconductor Array Camera and Spectrometer (PACS) observations, covering several bands in the mid-infrared and far-infrared, were used to further analyze the stellar population, to examine the structure of the trunks and other shell structures and to study this Rosette nebula photon-dominated region in more detail. The globulettes and elephant trunks have bright rims in the Ks band, which are unresolved in our images, on the sides facing the central cluster. An analysis of 21 globulettes, where surface brightness in the H2 1-0 S(1) line at 2.12µm is detected, shows that approximately a third of the surface brightness observed in the Ks filter is due to this line: the observed average of the H2/Ks surface brightness is 0.26±0.02 in the globulettes' cores and 0.30±0.01 in the rims. The estimated H2 1-0 S(1) surface brightness of the rims is ∼3-8x10–8 W/m2/sr/µm. The ratio of the surface brightnesses support fluorescence instead of shocks as the H2 excitation mechanism. The globulettes have number densities of n(H2)∼10–4cm–3 or higher. We estimated masses of individual globulettes and compared them to the results from previous optical and radio molecular line surveys. We confirm that the larger globulettes contain very dense cores, that the density is also high farther out from the core, and that their mass is subsolar. Two NIR protostellar objects were found in an elephant trunk and one was found in the most massive globulette in our study.

Abstract Copyright:

Journal keyword(s): stars: formation - stars: pre-main sequence - stars: protostars - dust, extinction - HII regions - ISM: individual objects: Rosette nebula

VizieR on-line data: <Available at CDS (J/A+A/567/A108): table5.dat table6.dat>

Nomenclature: Tables 5-6: [MHG2014] JHHMMSS.ss+DDMMSS.s N=1777+389.

Status at CDS:   All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 30

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Number of rows : 30

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 Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 445 0
2 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 570 1
3 NAME Gal Anticenter reg 05 46 +28.9           ~ 720 0
4 [GGF2007] Rosette Nebula 31 glb 06 30 56.66 +05 05 47.8           ~ 2 0
5 [GGF2007] Rosette Nebula 33 glb 06 30 58.09 +05 07 08.2           ~ 2 0
6 [GGF2007] Rosette Nebula 35 glb 06 31 05.88 +05 05 55.3           ~ 2 0
7 [GGF2007] Rosette Nebula 39 glb 06 31 09.67 +05 06 26.8           ~ 2 0
8 [GGF2007] Rosette Nebula 40 glb 06 31 10.80 +05 06 08.2           ~ 2 0
9 [GGF2007] Rosette Nebula 44 glb 06 31 13.91 +05 08 06.0           ~ 2 0
10 [GGF2007] Rosette Nebula 47 glb 06 31 16.16 +05 05 58.5           ~ 2 0
11 [GGF2007] Rosette Nebula 54 glb 06 31 21.31 +05 09 21.2           ~ 2 0
12 NGC 2244 104 WD? 06 31 36.2314370771 +05 07 50.166776548   14.74 14.42     DA:/sd 4 0
13 [GGF2007] Rosette Nebula 78 glb 06 31 37.95 +05 06 53.3           ~ 2 0
14 [GGF2007] Rosette Nebula 80 glb 06 31 39.37 +05 06 31.9           ~ 2 0
15 SSTSL2 J063139.53+051122.1 Y*? 06 31 39.58 +05 11 21.0           ~ 2 0
16 NAME Rosette Nebula HII 06 31 40 +04 57.8           ~ 443 1
17 [GGF2007] Rosette Nebula 84 glb 06 31 40.72 +05 06 30.1           ~ 2 0
18 [GGF2007] Rosette Nebula 88 glb 06 31 43.90 +05 11 28.6           ~ 2 0
19 [GGF2007] Rosette Nebula 91 glb 06 31 44.34 +05 12 01.1           ~ 2 0
20 [GGF2007] Rosette Nebula 93 glb 06 31 44.80 +05 11 52.8           ~ 2 0
21 [GGF2007] Rosette Nebula 94 glb 06 31 45.73 +05 11 33.9           ~ 2 0
22 [GGF2007] Rosette Nebula 95 glb 06 31 46.10 +05 11 24.4           ~ 2 0
23 [GGF2007] Rosette Nebula 114 glb 06 32 13.82 +05 12 55.3           ~ 2 0
24 [GGF2007] Rosette Nebula 122 glb 06 32 17.89 +05 12 23.4           ~ 2 0
25 [GGF2007] Rosette Nebula 123 glb 06 32 18.80 +05 12 36.8           ~ 2 0
26 [GGF2007] Rosette Nebula 124 glb 06 32 18.81 +05 12 39.3           ~ 2 0
27 SSTGLMC G206.1127-01.8542 IR 06 32 20.1 +05 12 48           ~ 1 0
28 [GGF2007] Rosette Nebula 129 glb 06 32 20.35 +05 12 52.2           ~ 2 0
29 [GGF2007] Rosette Nebula 130 glb 06 32 21.19 +05 13 41.2           ~ 2 0
30 M 16 OpC 18 18 48 -13 48.4   6.58 6.0     ~ 935 2

    Equat.    Gal    SGal    Ecl

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2020.07.10-02:51:04

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