NDLI: Absorption and scattering by interstellar dust: an XMM-Newton observation of Cyg X-2

Content Provider	EDP Sciences
Author	E. Costantini M. J. Freyberg P. Predehl
Abstract	We present results of the XMM-Newton observation of the bright X-ray binary Cyg X-2. In our analysis we focus on the absorption and scattering of the X-ray emission by interstellar dust distributed along the line of sight. The scattering halo around Cyg X-2, observed with the CCD detector EPIC-pn, is well detected up to ~7 arcmin and contributes ~5–7% to the total source emission at 1 keV, depending on the dust size distribution model considered. For the first time spatially resolved spectroscopy of a scattering halo is performed. In the halo spectrum we clearly detect the signature of the interstellar dust elements: O, Mg, and Si. In the keV band, the spectral modeling of the halo shows a major contribution of silicates (olivine and pyroxene). The spatial analysis of the halo surface brightness profile shows that the dust is smoothly distributed toward Cyg X-2 at least for ~60% of the path to the source. However, given the substantial pile-up, we could not investigate fainter or narrower components of the halo. Within this observation limit, the data do not show preference for a specific dust size distribution. In this analysis we used the Mie theory to compute the differential scattering cross section. The RGS data were used to investigate the ISM absorption. The absorption spectrum shows complexity around the oxygen edge at ~0.54 keV, which cannot be explained in a unique way: it involves either absorption by molecular oxygen or ionized atomic oxygen, as proposed in other studies of Cyg X-2. Combining the RGS results with the additional information on dust grains provided by the EPIC-pn spectrum of the scattered radiation we estimate a column density for dust absorption by oxygen, provided that it is locked in silicate grains.
Ending Page	200
Starting Page	187
Page Count	14
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2005/46/aa2562-04/aa2562-04.html
e-ISSN	14320746
Issue Number	1
Journal	Astronomy & Astrophysics
Volume Number	444
DOI	10.1051/0004-6361:20042562
Language	English
Publisher	EDP Sciences
Publisher Date	2005-12-01
Access Restriction	Open
Rights Holder	© ESO, 2005
Subject Keyword	ISM: dust, extinction X-rays: ISM scattering stars: binaries: general ISM: dust, extinction / X-rays: ISM / scattering / stars: binaries: general
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Absorption and scattering by interstellar dust: XMM-Newton observation of Cyg X-2

High-resolution X-ray spectroscopy of the interstellar medium — XMM-Newton observation of the LMXB GS 1826–238

Investigating the interstellar dust through the Fe K-edge

XMM-Newton observation of 4U 1820-30 — Broad band spectrum and the contribution of the cold interstellar medium

The nature of the X-ray halo of the plerion G21.5–0.9 unveiled by XMM-Newton and Chandra

Physical properties of amorphous solid interstellar material from X-ray absorption spectroscopy of Scorpius X-1

Interstellar medium composition through X-ray spectroscopy of low-mass X-ray binaries

Gas absorption and dust extinction towards the Orion Nebula Cluster

The interstellar oxygen-K absorption edge as observed by XMM-Newton — Separation of instrumental and interstellar components

Absorption and scattering by interstellar dust: an XMM-Newton observation of Cyg X-2

Similar Documents

Absorption and scattering by interstellar dust: XMM-Newton observation of Cyg X-2

High-resolution X-ray spectroscopy of the interstellar medium — XMM-Newton observation of the LMXB GS 1826–238

Investigating the interstellar dust through the Fe K-edge

XMM-Newton observation of 4U 1820-30 — Broad band spectrum and the contribution of the cold interstellar medium

The nature of the X-ray halo of the plerion G21.5–0.9 unveiled by XMM-Newton and Chandra

Physical properties of amorphous solid interstellar material from X-ray absorption spectroscopy of Scorpius X-1

Interstellar medium composition through X-ray spectroscopy of low-mass X-ray binaries

Gas absorption and dust extinction towards the Orion Nebula Cluster

The interstellar oxygen-K absorption edge as observed by XMM-Newton — Separation of instrumental and interstellar components

Absorption and scattering by interstellar dust: an XMM-Newton observation of Cyg X-2