2020A&A...641A.149R


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.05CET01:11:55

2020A&A...641A.149R - Astronomy and Astrophysics, volume 641A, 149-149 (2020/9-1)

Magnesium and silicon in interstellar dust: X-ray overview.

ROGANTINI D., COSTANTINI E., ZEEGERS S.T., MEHDIPOUR M., PSARADAKI I., RAASSEN A.J.J., DE VRIES C.P. and WATERS L.B.F.M.

Abstract (from CDS):


Context. The dense Galactic environment is a large reservoir of interstellar dust. Therefore, this region represents a perfect laboratory to study the properties of cosmic dust grains. X-rays are the most direct way to detect the interaction of light with dust present in these dense environments.
Aims. The interaction between the radiation and the interstellar matter imprints specific absorption features on the X-ray spectrum. We study them with the aim of defining the chemical composition, the crystallinity, and structure of the dust grains that populate the inner regions of the Galaxy.
Methods. We investigated the magnesium and the silicon K-edges detected in the Chandra/HETG spectra of eight bright X-ray binaries, distributed in the neighbourhood of the Galactic centre. We modelled the two spectral features using accurate extinction cross-sections of silicates, which we measured at the synchrotron facility Soleil, France.
Results. Near the Galactic centre, magnesium and silicon show abundances similar to the solar ones and they are highly depleted from the gas phase (δMg>0.90 and δSi>0.96). We find that amorphous olivine with a composition of MgFeSiO4 is the most representative compound along all lines of sight according to our fits. The contribution of Mg-rich silicates and quartz is low (less than 10%). On average we observe a percentage of crystalline dust equal to 11%. For the extragalactic source LMC X-1, we find a preference for forsterite, a magnesium-rich olivine. Along this line of sight we also observe an under-abundance of silicon ASi/ALMC=0.5±0.2.

Abstract Copyright: © ESO 2020

Journal keyword(s): astrochemistry - X-rays: binaries - X-rays: ISM - dust, extinction - ISM: abundances - X-rays: individuals: LMC X-1

Simbad objects: 18

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Number of rows : 18

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 15069 1
2 X LMC X-1 HXB 05 39 38.8285930597 -69 44 35.533031148   14.8 14.5     O8(f)p 567 2
3 PSR B0540-69 Psr 05 40 10.84 -69 19 54.2           ~ 804 3
4 DEM L 316b SNR 05 47 00.00 -69 43 00.0           ~ 24 0
5 Mrk 421 BLL 11 04 27.3139210166 +38 12 31.798324828   13.50 12.90 8.31   ~ 2410 1
6 V* V801 Ara LXB 16 40 55.5979962948 -53 45 04.953475039 17.50 18.20 17.5   17.07 ~ 792 1
7 [KRL2007b] 222 LXB 17 09 07.61 -36 24 25.7           ~ 216 1
8 V* V2216 Oph LXB 17 31 44.17 -16 57 40.9 16.40 17.10 16.8     ~ 264 1
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3548 3
10 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11850 0
11 NAME XTE J17464-3213 LXB 17 46 15.59637 -32 14 00.8600           ~ 616 0
12 X Sgr X-1 LXB 17 47 56.0 -26 33 49           ~ 350 0
13 2XMM J180112.4-254436 LXB 18 01 12.40 -25 44 36.1           ~ 365 1
14 X Sgr X-3 LXB 18 01 32.3 -20 31 44           ~ 220 1
15 V* NP Ser LXB 18 16 01.389 -14 02 10.62   18.8       K 602 2
16 X Sgr X-4 LXB 18 23 40.57 -30 21 40.6   19.06 18.81     ~ 910 1
17 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2324 0
18 V* V1341 Cyg LXB 21 44 41.1544523872 +38 19 17.065856122 15.00 15.13 14.68 15.00   A9III 1082 1

    Equat.    Gal    SGal    Ecl

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2020.12.05-01:11:55

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