Chandra X-Ray Observatory
	(CXC)

Please note that the abstracts refer to the PROPOSED project - which is not necessarily identical to the approved project.
For accurate target information, please check the Observation Catalog.


Joint XMM/Chandra Accepted Cycle 9 Targets and Abstracts

Proposal NumberSubject CategoryPI NameChandra TimeTitle
09400002BH AND NS BINARIES Joern Wilms
50
Joint XMM-Newton, Chandra, and RXTE Observations of Dips in Cyg X-1
09400003BH AND NS BINARIES Rudy Wijnands
30
Monitoring Observations of the Galactic Center Region
09300001WD BINARIES AND CV Wolfgang Pietsch
100
Resolving short supersoft source states of optical novae in the core of M31

Subject Category:BH AND NS BINARIES

Proposal Number: 09400002

Title:Joint XMM-Newton, Chandra, and RXTE Observations of Dips in Cyg X-1

PI Name: Joern Wilms

At orbital phase zero (i.e., the O star secondary intervening our line of sight to the black hole primary), Cyg X-1 shows X-ray dips due to highly variable absorption in matter in the accretion stream. Studying the physics of these dips requires joint XMM/Chandra-HETGS/RXTE observations: XMM-Newton provides the crucially important spectral continuum through the broad Fe line region at CCD resolution and it achieves high signal-to-noise in the <2keV band, allowing the dipping events to be temporally resolved and spectrally modeled on short time scales. The simultaneous Chandra data provide high resolution spectroscopy of the dipping events (albeit at a lower time resolution compared to XMM-Newton), while RXTE provides the hard X-ray continuum out to >150keV.


Subject Category:BH AND NS BINARIES

Proposal Number: 09400003

Title:Monitoring Observations of the Galactic Center Region

PI Name: Rudy Wijnands

Monitoring Observations of the Galactic Center Region We propose to continue our monitoring campaign using XMM-Newton and Chandra of the inner 1.2 square degree region centered on the Galactic Center. We will be able to detect transients in this region with a peak luminosity of 1E33-1E35 ergs/s, 10 to 1000 times more sensitive than what is possible with other satellites (i.e., RXTE and INTEGRAL). This allows us to observe a very poorly studied group of transients and to follow the luminosity behavior of faint (~1E36 ergs/s) persistent sources.


Subject Category: WD BINARIES AND CV

Proposal Number:09300001

Title:Resolving short supersoft source states of optical novae in the core of M31

PI Name: Wolfgang Pietsch

We propose to monitor the M31 core with five 23ks XMM-Newton EPIC and five 20ks Chandra HRC-I observations equally distributed from Nov 2007 to mid Feb 2008 to determine the light curves for short supersoft source (SSS) states of optical novae. SSS states with <100 d duration indicate accreting massive white dwarfs. They are proposed as SN Ia progenitors and determining their frequency is very important. We will correlate detected sources with novae from optical monitoring of the same area. With a nova rate in the field of ~25/yr and SSS states lasting from weeks to years we will follow light curves of many novae. Durations of the nova SSS state will allow us to constrain envelope and whitedwarf masses. We will also monitor time variability of ~200 M31 centre X-ray sources (mostly XRBs).

Smithsonian Institute Smithsonian Institute

The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA.   Email:   cxchelp@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2017. All rights reserved.