We have added ACS/HRC F250W and F330W polarimetry observations (not in Phase I) in an effort to overcome the instrumental polarization problems expected with ACS/HRC for our UV flux monitoring. ----- Submission 3 (Thu Oct 14 05:08:11 GMT 2004) ----- ----- Submission 4 (Sat May 14 03:56:23 GMT 2005) ----- Assigned ID: 135 ----- Submission 1 (Fri Jan 21 02:31:24 GMT 2005) ----- Phase I Proposal 135 (p3) successfully submitted. ----- Submission 3 (Fri Jan 21 20:08:23 GMT 2005) ----- Phase I Proposal 135 (p3) successfully submitted. ----- Submission 4 (Fri Jan 21 23:18:33 GMT 2005) ----- Phase I Proposal 135 (p3) successfully submitted. ----- Submission 5 (Fri Jan 21 23:58:47 GMT 2005) ----- Two of our visits (2 orbits total) are not schedulable in two-gyro mode, but are ok in three-gyro mode. We have elected to leave these two visits in the proposal. HST / Chandra Monitoring of a Dramatic Flare in the M87 Jet As the nearest galaxy with an optical jet, M87 affords an unparalleled opportunity to study extragalactic jet phenomena at the highest resolution. During 2002, HST and Chandra monitoring of the M87 jet detected a dramatic flare in knot HST-1 located ~1" from the nucleus. As of late 2004 its brightness has increased 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 nucleus in brightness. To our knowledge this is the first incidence of an optical or X-ray outburst from a jet region which is spatially distinct from the core source -- this presents an unprecedented opportunity to study the processes responsible for non-thermal variability and the X-ray emission. We propose seven epochs of HST/STIS monitoring during Cycle 14, as well as seven epochs of Chandra/ACIS observation (5ksec each). We also include a brief HRC/ACS observations that will be used to gather spectral information and map the magnetic field structure. The results of this investigation are of key importance not only for understanding the nature of the X-ray emission of the M87 jet, but also for understanding flares in blazar jets, which are highly variable, but where we have never before been able to resolve the flaring region in the optical or X-rays. These observations will allow us to test synchrotron emission models for the X-ray outburst, constrain particle acceleration and loss timescales, and study the jet dynamics associated with this flaring component.
Visits 31-35: Flux monitoring and proper motions of knots in the M87 Jet. We will obtain ACS/HRC F250W images of the jet using a setup which duplicates our recent Cycle 13 monitor observations. A single orbit is required. The superluminal knots in region HST-1 which have estimated fluxes 2 * 10^-18 erg cm^-2 s^-1 AA^-1 at 3000Angstrom\ (assuming a nu^-1 spectrum found in nearby knots) will have SNR=24 in 2400 sec. Sub-exposures will be dithered to improve PSF sampling by the 0.05" pixels and minimize detector artifacts; a large 3" dither is also used to remove the occulting finger. The observations are scheduled to be within 3 days of Chandra M87 observations (where possible); the Chandra observations are an important part of this program. Short polarization observations in either F330W or F606W are included to allow correction of instrumental polarization effects on the observed F250W fluxes (theses are needed since the target is expected to be highly polarized). Visits 11, 13, 15: ACS/HRC multi-band observations roughly 3 months apart. Images taken in F220W, F475W, and F814W for derivation of optical spectral indicies. Again a large dither is used to avoid data loss due to the occulting finger. Visit 21, 23, 25: ACS/HRC F606W polarimetry is performed so as to derive the magnetic field configuation of the jet, and especially region HST-1. Same large dithers are used to avoid the occulting finger. AGN/QUASARS 12 false 35 0.0 false false false false false SUPPORTED GALAXY JET RADIO GALAXY J2000 00 00 0.0000 +00 00 0.00 J2000 ACS/HRC Imaging No No F220W ACS/HRC Imaging No No F475W ACS/HRC Imaging No Yes F606W ACS/HRC Imaging No No F814W ACS/HRC Imaging No No F220W ACS/HRC Imaging No No F220W ACS/HRC Imaging No No F220W ACS/HRC Imaging No No F220W ACS/HRC Imaging No No F475W ACS/HRC Imaging No Yes F606W ACS/HRC Imaging No No F814W ACS/HRC Imaging No No F220W ACS/HRC Imaging No No F220W POS-TARG DITHER 0.084 LINE false false 2 32.14 ACS-HRC-DITHER-LINE 1 false /var/tmp/OPVisit48311.xml (Tic-Visit :proposal-id 10617 :visit-id "11" :proposal-version -1 :trans-version "20050323" :date "16-May-2005 09:20:12.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 220816 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 10617 :visit-id "11" :obset-id 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