The 9.7 and 18 μm silicate absorption profiles towards diffuse and molecular cloud lines-of-sight

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Volume 526 (February 2011)

A&A, 526 (2011) A152

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Table 1

Overview of the selected spectra from the Spitzer archive.

Target name	Other	l	b	Program ID	Spect.	Diffuse (D) or	9.7 or 18 μm
	designations	(degrees)	(degrees)		type	molecular (M)	silicate feature

StRS 136	2MASS J17475608	0.040937	−0.566892	3616	B8–A9I²	D	9.7
	−2911439
StRS 164	2MASS J18161876	14.213568	−0.002043	3616	B8–A9I²	D	9.7
	−1635468
SSTc2d_J182835.8+002616	...	30.712112	5.280682	139 and 172–179	...	M (Serpens)	9.7
[SVS76] Ser 9¹	2MASS J18294508	31.626616	5.423514	139 and 172–179	...	M (Serpens)	9.7
	+0118469
StRS 354	IRAS 20273+3740	76.972032	−0.635686	20294	O7–B3²	D	9.7 and 18
Elias 3-13³	IRAS 04303+2609	172.694191	−14.498000	139 and 172–179	K2III³	M (Taurus)	9.7
SSTc2d_J163346.2−242753	...	354.158006	15.606477	139 and 172–179	...	M (ρ Ophiuchi)	9.7
G323.2103−00.3473⁴	2MASS J15285631	323.211041	−0.347425	3616	...	D	18
	−5653045
G343.6142−00.1596⁴	2MASS J16585873	343.613830	0.160012	3616	...	D	18
	−4220543
G345.3650−00.4015⁴	2MASS J17070616	345.364763	−0.401650	3616	...	D	18
	−4118140

Notes. Listed are the target name and the Galactic longitude and latitude. The Spitzer ID of the program that contains the observation and the spectral type of the source is listed and it is indicated if the observation was done in a diffuse (D) or molecular (M) sightline. In the case of molecular sightlines, the corresponding molecular cloud is listed. Finally, we list whether the 9.7 or 18 μm silicate feature was extracted from these spectra.

⁽¹⁾

Strom et al. (1976);

⁽²⁾

Rawlings et al. (2000);

⁽³⁾

Elias (1978);

⁽⁴⁾

Egan et al. (2003).

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