Chandra X-Ray Observatory

Joint Chandra/HST Accepted Cycle 7 Targets and Abstracts

Proposals from the following HST scientific categories were accepted by the Cycle 14 HST TAC:

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.

Click on the PI Name for the Proposal Abstract

PI NameTitleChandra timeTargets
KulkarniGamma-Ray Bursts from Start to Finish: A Legacy Approach
RobertsULX counterparts: the key to finding intermediate-mass black holes
M83 IXO 82
BirettaHST / Chandra Monitoring of a Dramatic Flare in the M87 Jet

Scientific Category: SN, SNR AND ISOLATED NS
Title: Gamma-Ray Bursts from Start to Finish: A Legacy Approach
PI: Kulkarni
Approved Chandra Time (Ksecs): 75


The progenitors of long-duration GRBs are now known to be massive stars. This result lends credence to the collapsar model, where a rotating massive star ends its life leaving a black hole or a highly magnetized neutron star, the inner engine. Som ehow these engines create the most highly relativistic and highly collimated outflows that we know of, through mechanisms that no current theory can explain. The launch o f Swift is bringing us into a new era, where we can make broadband observations that will enable us to study these fascinating physical processes. We propose here an ambi tious, comprehensive program to obtain the datasets that will become the standard tha t any successful model for the central engine must explain.

Title: ULX counterparts: the key to finding intermediate-mass black holes
PI: Roberts
Approved Chandra Time (Ksecs): 20


Most formation scenarios for supermassive black holes rely on large black hol es being present in the early universe, formed by the collapse of primordial Populati on III stars. A relic of this population could still be present in galactic halos at the current epoch, though no CONCLUSIVE evidence for such a class of "intermediate-ma ss" black holes has been found. The most likely current candidates are the ultralumin ous X-ray sources (ULXs), which show tantalising evidence for IMBHs (e.g. extreme X-r ay luminosities and low accretion disc temperatures). We propose to search for optica l counterparts to six of the nearest ULXs. We will use this programme as a pathfinder for future radial velocity measurements, potentially providing the first undisputed mass constraints for these systems.

Title: HST / Chandra Monitoring of a Dramatic Flare in the M87 Jet
PI: Biretta
Approved Chandra Time (Ksecs): 35

During 2002, HST and Chandra monitoring of the M87 jet detected a dramatic fl are in knot HST-1 located ~1" from the nucleus. As of late 2004 its brightness has in creased fifty-fold in the optical band, and continues to increase sharply; the X-rays show a similarly dramatic outburst. In both bands HST-1 now greatly exceeds the nucl eus in brightness. (truncated) We propose seven epochs of HST/STIS monitoring during Cycle 14, as well as seven epochs of Chandra/ACIS observation (5ksec each). We also i nclude a brief HRC/ACS observations that will be used to gather spectral information and map the magnetic field structure. [Original HST abstract truncated for Chandra RP S form; HST proposal # 10617]

Last modified: 12/02/10

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