XMM-Newton Cycle 17/HST Cycle 26
Joint Program Overview
By agreement with the HST Project, the XMM-Newton Project may award up to 30 orbits of HST observing time each observing cycle. Similarly, the HST Project may award up to 150 ks of XMM-Newton time. The time will be awarded only for highly ranked proposals that require the use of both observatories and shall not apply to usage of archival data. The only criterion above and beyond the usual review criteria is that both sets of data are required to meet the primary science goals. Proposers should have taken special care in justifying both the scientific and technical reasons for requesting observing time on both missions. For these solicitations, no HST time will be allocated without the need for XMM-Newton time on the same target to complete the proposed investigation.
For XMM-Newton's Cycle 17 and HST's Cycle 25/26, the XMM-Newton Observing Time Allocation Committee (OTAC) met in the fall of 2017 and reviewed their proposals. The following five joint XMM-Newton proposals (listed below) have been approved for execution in HST Cycle 25/26. These observations have been loaded with the current Cycle 25 programs.
Catching AGN in Deep Minimum States to Unveil Their Core Environment
European Space Agency - ESTEC
The deep minimum state of AGNs is characterized by a strongly suppressed or even absent primary continuum. As the continuum disappears weak spectral features like relativistic iron lines or narrow soft X-ray emission lines from ionised plasmas become highly significant and their parameters can be determined. Therefore deep minimum states offer unique possibilities to investigate in detail the physics of the reprocessed components in AGN, including the immediate vicinity of the supermassive black hole. Applying our experience (several deep minimum observations) we propose 2 triggered 10ks XMM snapshot, one 80ks XMM follow-up simultaneous with one 80ks NuSTAR one 2-orbit HST observation of an AGN in deep minimum state. We will identify deep minimum states mainly based on Swift and XMM-Newton slews.
|AGN1||Generic||Target||COS/FUV||G130M and G160M||2|
X-ray and UV monitoring of the extraordinary changing-look AGN Mrk 1018
Leibniz-Institut fur Astrophysik Potsdam (AIP)
We propose two quasi-simultaneous observations of XMM (each 65 ks) and HST (each 2 orbits) to understand the ongoing changes of changing-look AGN Mrk 1018. Optical monitoring revealed that the dramatic dimming phase stopped, suggesting that the accretion disk is in a major reconfiguration phase. The combined deep exposure will reveal which spectral components have changed since a high S/N XMM spectrum was taken during the bright phase a few years ago. Comparing the two AO17 observations will allow us to look for spectral changes on half-year timescales. These two XMM observations will fill the gaps of our already accepted low S/N Chandra monitoring program on Mrk 1018. The joint HST observations will allow us to establish the states of the accretion disk and how this connects to the X-ray corona.
|MRK-1018||02 06 15.98||-00 17 29.18||COS/FUV||G140L||4|
Follow-up Observation of a Hyperluminous Intermediate-mass Black Hole Candidate
University of New Hampshire
Intermediate-mass black holes (IMBH, ~10^2-10^5 msun) have been long sought after because they are associated with several important astrophysical processes. The best IMBH candidates are hyperluminous off-nuclear X-ray sources (HLXs) with LX>10^41 erg/s, but very few are known. We have identified a new HLX candidate (LX~10^43 erg/s), at an offset of 11.6" (12 kpc) from the center of its host galaxy (D L=247 Mpc). We request a deep (60 ks) XMM-Newton observation of the source in AO17 to measure its flux and spectral evolution while it is in the decay phase of a prolonged outburst, in order to demonstrate its IMBH nature and confirm our tidal disruption event explanation for the outburst. An HST orbit is also requested to confirm that our source is in a star cluster.
|3XMMJ215022||21 50 21.6||-05 51 3.89||ACS/WFC||F775W||1|
GSN 069: a recent AGN re-activation or a long-lasting Tidal Disruption Event ?
Centro de Astrobiologia (CSIC/INTA) Inst. Nac. de Tec. Aero.
We request an XMM-Newton and HST/STIS observation of GSN 069, an ultra-soft, unabsorbed, highly variable X-ray source optically classified as a Seyfert 2 AGN. Its high Eddington ratio (0.5) makes GSN 069 an exceptional high Eddington ratio 'true Seyfert 2 galaxy' candidate. The data so far suggest two possible interpretations: 1) a recent re-activation of the AGN after a period of low activity or quiescence or 2) an unusual (but not unique) long-lived outburst due to a Tidal Disruption Event (TDE). With our joint XMM/HST program we aim at clarifying the nature of this most exceptional source and derive constraints on the formation and evolution of BLR, disc winds, and AGN X-ray coronae in the first scenario, or on the nature of rare sustained TDEs in the second.
|6DFGS-GJ0119||01 19 8.64||-34 11 30.47||STIS/NUV||G230L and G140L||3|
Unveiling the Nature of Fossil Groups of Galaxies with XMM-Newton-HST
Eureka Scientific Inc.
Fossil groups present a puzzle to theories of structure formation. Despite the low number of bright galaxies, their high velocity dispersions and high T X seem to indicate cluster-like gravitational potential wells. The measured concentration parameters seem to be high indicating early formation epochs but some recent observations contradict that scenario. We propose a discriminatory test, using intracluster light to mass ratio, combining short XMM and HST observations for a classic massive fossil group. We will use a newly developed method for measuring ICL that is independent of arbitrary assumptions about light distribution and that has provided new robust results. This test will allow us to set independent constraints on formation mechanisms and ages of these peculiar (but numerous) systems.
|RX-J10074257||10 07 42.53||38 00 46.62||ACS/WFC||F606W and F435W||3|
The programs approved from the previous XMM Cycle 11-17 TACs can be found at the following links: