2011A&A...526A.152V


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.13CET12:10:46

2011A&A...526A.152V - Astronomy and Astrophysics, volume 526A, 152-152 (2011/2-1)

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

VAN BREEMEN J.M., MIN M., CHIAR J.E., WATERS L.B.F.M., KEMPER F., BOOGERT A.C.A., CAMI J., DECIN L., KNEZ C., SLOAN G.C. and TIELENS A.G.G.M.

Abstract (from CDS):

Studying the composition of dust in the interstellar medium (ISM) is crucial for understanding the cycle of dust in our galaxy. The mid-infrared spectral signature of amorphous silicates, the most abundant dust species in the ISM, is studied in different lines-of-sight through the Galactic plane, thus probing different conditions in the ISM. We have analysed ten spectra from the Spitzer archive, of which six lines-of-sight probe diffuse interstellar medium material and four probe molecular cloud material. The 9.7µm silicate absorption features in seven of these spectra were studied in terms of their shape and strength. In addition, the shape of the 18µm silicate absorption features in four of the diffuse sightline spectra were analysed. The 9.7µm silicate absorption bands in the diffuse sightlines show a strikingly similar band shape. This is also the case for all but one of the 18µm silicate absorption bands observed in diffuse lines-of-sight. The 9.7 µm bands in the four molecular sightlines show small variations in shape. These modest variations in the band shape are inconsistent with the interpretation of the large variations in τ9.7/E(J-K) between diffuse and molecular sightlines in terms of silicate grain growth. Instead, we suggest that the large changes in τ9.7/E(J-K) must be due to changes in E(J-K).

Abstract Copyright:

Journal keyword(s): dust, extinction - evolution - techniques: spectroscopic - infrared: ISM - ISM: clouds

Simbad objects: 15

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Number of rows : 15

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 2MASS J04332594+2615334 * 04 33 25.9454881389 +26 15 33.355815770           K2III 42 0
2 NAME Taurus Dark Cloud SFR 04 41.0 +25 52           ~ 3320 0
3 MSX6C G323.2103-00.3473 IR 15 28 56.3075121920 -56 53 04.544299262         12.59 ~ 1 0
4 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 2936 0
5 2MASS J16334622-2427531 Y*? 16 33 46.2210604567 -24 27 53.106801904           ~ 5 0
6 MSX6C G343.6142+00.1596 IR 16 58 58.7328314310 -42 20 54.392499951         12.45 ~ 1 0
7 UCAC3 98-249885 * 17 07 06.1689265209 -41 18 14.009642603       16.48 12.01 ~ 1 0
8 WR 98a WR* 17 41 13.0431655551 -30 32 30.425152324   18.40   15.20 13.82 WC8/9 87 1
9 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11037 0
10 [RHI84] 10-644 * 17 47 56.0792134489 -29 11 44.026445422     16.00     B8-A9I 8 0
11 StRS 164 * 18 16 18.7641175218 -16 35 46.865962270           B8-A9I 7 0
12 2MASS J18283579+0026159 IR 18 28 35.7842399045 +00 26 15.896775386           ~ 3 0
13 2MASS J18294508+0118469 * 18 29 45.08 +01 18 47.0           G0/M4III 12 0
14 NAME Serpens Cloud SFR 18 29 49 +01 14.8           ~ 884 2
15 IRAS 20273+3740 * 20 29 15.3562205326 +37 51 01.846583420           O7-B3 7 0

    Equat.    Gal    SGal    Ecl

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2019.11.13-12:10:46

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