2019A&A...627A..16Z


Query : 2019A&A...627A..16Z

2019A&A...627A..16Z - Astronomy and Astrophysics, volume 627A, 16-16 (2019/7-1)

Dust absorption and scattering in the silicon K-edge.

ZEEGERS S.T., COSTANTINI E., ROGANTINI D., DE VRIES C.P., MUTSCHKE H., MOHR P., DE GROOT F. and TIELENS A.G.G.M.

Abstract (from CDS):

Context. The composition and properties of interstellar silicate dust are not well understood. In X-rays, interstellar dust can be studied in detail by making use of the fine structure features in the Si K-edge. The features in the Si K-edge offer a range of possibilities to study silicon-bearing dust, such as investigating the crystallinity, abundance, and the chemical composition along a given line of sight. Aims. We present newly acquired laboratory measurements of the silicon K-edge of several silicate-compounds that complement our measurements from our earlier pilot study. The resulting dust extinction profiles serve as templates for the interstellar extinction that we observe. The extinction profiles were used to model the interstellar dust in the dense environments of the Galaxy. Methods. The laboratory measurements, taken at the Soleil synchrotron facility in Paris, were adapted for astrophysical data analysis and implemented in the SPEX spectral fitting program. The models were used to fit the spectra of nine low-mass X-ray binaries located in the Galactic center neighborhood in order to determine the dust properties along those lines of sight. Results. Most lines of sight can be fit well by amorphous olivine. We also established upper limits on the amount of crystalline material that the modeling allows. We obtained values of the total silicon abundance, silicon dust abundance, and depletion along each of the sightlines. We find a possible gradient of 0.06±0.02dex/kpc for the total silicon abundance versus the Galactocentric distance. We do not find a relation between the depletion and the extinction along the line of sight.

Abstract Copyright: © ESO 2019

Journal keyword(s): dust, extinction - X-rays: binaries - ISM: abundances

VizieR on-line data: <Available at CDS (J/A+A/627/A16): table1.dat oliv1.dat prox2.dat prox3.dat enst4.dat prox5.dat prox6.dat oliv7.dat prox8.dat faya9.dat enst10.dat fors11.dat quar12.dat quar13.dat quar14.dat>

Simbad objects: 14

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Number of rows : 14
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 V* UY Vol LXB 07 48 33.71 -67 45 07.7 16.10 17.00 16.9 16.7 17.05 ~ 613 0
2 X Nor X-1 LXB 16 34 01.610 -47 23 34.80           ~ 500 0
3 4U 1642-45 LXB 16 45 47.7 -45 36 40     14.30     ~ 411 1
4 X Ara X-1 LXB 17 06 15.314 -43 02 08.69           ~ 265 1
5 4U 1705-44 LXB 17 08 54.470 -44 06 07.35           ~ 388 0
6 NAME Slow Burster LXB 17 31 57.73 -33 50 02.5     15.50     ~ 818 1
7 HD 161796 pA* 17 44 55.4694563472 +50 02 39.482823336 8.00 7.68 7.21 6.77 6.51 F3Ib 325 0
8 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 14048 0
9 4U 1758-25 LXB 18 01 09.7308060816 -25 04 44.120221284     11.08     ~ 648 1
10 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 388 1
11 V* V5512 Sgr LXB 18 14 31.55 -17 09 26.7     12.73     K5III 384 0
12 V* NP Ser LXB 18 16 01.389 -14 02 10.62   18.8       K 639 2
13 NAME Galactic Molecular Ring PoG ~ ~           ~ 42 0
14 NAME Galactic Bulge reg ~ ~           ~ 4208 0

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2023.11.28-20:12:16

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