2008ApJ...686L..99S

Query : 2008ApJ...686L..99S

2008ApJ...686L..99S - Astrophys. J., 686, L99-L102 (2008/October-3)

AKARI near-infrared spectroscopy: detection of H₂ O and CO₂Ices toward young stellar objects in the Large Magellanic Cloud.

SHIMONISHI T., ONAKA T., KATO D., SAKON I., ITA Y., KAWAMURA A. and KANEDA H.

Abstract (from CDS):

We present the first results of AKARI Infrared Camera near-infrared spectroscopic survey of the Large Magellanic Cloud (LMC). We detected absorption features of the H₂ O ice 3.05 µm and the CO₂ice 4.27 µm stretching mode toward seven massive young stellar objects (YSOs). These samples are for the first time spectroscopically confirmed to be YSOs. We used a curve-of-growth method to evaluate the column densities of the ices and derived the CO₂/H₂O ratio to be 0.45±0.17. This is clearly higher than that seen in Galactic massive YSOs (0.17±0.03). We suggest that the strong ultraviolet radiation field and/or the high dust temperature in the LMC may be responsible for the observed high CO₂ ice abundance.

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Journal keyword(s): Stars: Circumstellar Matter - ISM: Dust, Extinction - ISM: Abundances - ISM: Molecules - Galaxies: Magellanic Clouds - Stars: Pre-Main-Sequence

Nomenclature: Table 1: [SOK2008] STN (Nos ST1-ST7).

Simbad objects: 7

Full paper

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Number of rows : 7

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	IRAS 05148-6715	LP*	05 14 49.5386182632	-67 12 21.470285340	21.299	21.145	20.652		18.771	~	16	0
2	IC 2127	EmO	05 22 12.532	-67 58 31.92			11.60			~	107	1
3	NAME LMC	G	05 23 34.6	-69 45 22			0.4			~	19090	0
4	2MASS J05235115-6807122	Y*O	05 23 51.150	-68 07 12.23		19.426	16.657	14.930		~	15	0
5	IRAS 05311-6836	Or*	05 30 54.4212026496	-68 34 27.763705812						~	19	0
6	IRAS 05400-7013	Y*O	05 39 31.172	-70 12 16.63						~	20	0
7	2MASS J05394112-6929166	Y*O	05 39 41.125	-69 29 16.68						~	10	0

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