0 Assigned ID: 1619 ----- Attempting Submission 1 (Mon Dec 11 08:25:21 GMT 2017) ----- 0 ----- Attempting Submission 1 (Fri Dec 15 19:09:21 GMT 2017) ----- 0 Constraining the emergent EUV ionizing emission in the reawakening monster in Mrk 590 After a 10-year hiatus, Mrk 590 is rekindling its nuclear activity! This offers a very rare opportunity to document the onset of AGN activity as it occurs that can lead to a better understanding of the long-standing issue of how AGNs are fuelled and how AGN work. We have monitored Mrk 590 ~bi-daily with Swift since late August 2017 in response to sudden and strong X-ray flares that continue. Early December we triggered our HST/COS ToO program of 2 single-orbit visits and additional ToO programs with VLT/Xshooter and Gemini that run for a month and spectroscopically cover from 3200A to 2.2micron. We now observe with Swift daily for at least another month. Our recent VLT/MUSE, X-shooter and HST/COS data show a strengthening of the UV-optical-IR broad lines. In particular, we see appearance of HeI IR lines that indicate a strengthening of the EUV continuum; the continuum is still low in the UV-optical and non-existing in the near-IR. We kindly ask for two additional single-orbit visits in order to follow the strengthening of the broad component of the UV Helium, Lyman-alpha and Carbon lines in order to better constrain the build-up of the ionizing EUV continuum source. The HST/COS data are pivotal, since we cannot obtain these constraints on the far-UV and EUV emission any other way. An extensive and ancillary database is being acquired on Mrk 590 from radio through X-ray wavelengths - also during this current brief monitoring campaign. These new and existing HST/COS data will contribute with unique information to the legacy database on this intriguing object, Mrk 590, that will undoubtedly spawn new insight on AGN and their fuelling. This is an extension of proposal 15404. The source has already been successfully observed. Same observing startegy applies. =============================================================== We propose to obtain COS low resolution FUV observations of the Seyfert 1 galaxy Mrk 590 to determine if the AGN thermal emission and broad emission lines have re-appeared in response to the significant increase in X-ray and far-UV emission as detected by Swift when this program is triggered. Using the G140L grating @1105 Ang we will be able to cover the Lya1215, NV1240, Si IV + O IV1400, C IV1549, HeII1640 and CIII]1909 broad emission lines in a single exposure. The grating resolution is adequate to resolve the typical AGN narrow emission components; the width of the [O III]5007 narrow line is FWHM~400 km s-1. As explained in the Phase I, the target has been closely monitored with SWIFT, and in the past 80 days UVW2 fluxes (centroid wavelength 1928) have varied from a minimum of ~2.2e-15 erg s-1 cm-2 Ang-1 to a max of ~4.0 erg s-1 cm-2 Ang-1. Note: the target has already been successfully observed in the same configurations during faint state (PID 13518) ACQUISITION: The target has precise 2MASS coordinates (ICRS reproduced with an error < 0.1"). We plan to use ACQ/IMG NUV MIRRORB and an exp time of 140s. For our ETC calculations we assume a flat continuum in fl normalized to half of the min observed UVW2 flux f_l ~1.1e-15 erg s-1 cm-2 Ang-1 @1928 Ang (http://etc.stsci.edu/etc/results/COS.ta.1030198/). This will ensure acquisition in case of "faint" state. The source will not pose a threat to the detector even if it ends up being 5 times more luminous than the max detected in the past 80 days (http://etc.stsci.edu/etc/results/COS.ta.1030199/). SCIENCE: We use the G140L grating at 1105Ang with FP_POS=ALL. For ETC calculations we assume a flat continuum normalized to the mean observed UVW2 flux in the past 80 days (http://etc.stsci.edu/etc/results/COS.sp.1030204/). Buffer time is set to 2/3 of the ETC buffer time. The source will not pose a threat to the detector even if it ends up being 5 times more luminous than the past 80 days (http://etc.stsci.edu/etc/results/COS.sp.1030205/). Massive Black Holes And Their Host Galaxies 0 SUPPORTED GALAXY ACCRETION DISK BLR SEYFERT NO This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 COS/FUV Spectroscopic No No G140L 1105 COS/FUV Spectroscopic No No G140L 1105 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1514861798000 65.3029636304245 (Tic-Visit :proposal-id 15448 :visit-id "01" :proposal-version -1 :trans-version "20171009" :date "15-Dec-2017 14:08:44.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 52416 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15448 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15448 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2637 :al-overhead-at-end 0 :internal-dur-at-end 331 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2978 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. 1516392005000 60.0 (Tic-Visit :proposal-id 15448 :visit-id "02" :proposal-version -1 :trans-version "20171009" :date "15-Dec-2017 14:08:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 52416 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15448 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15448 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2637 :al-overhead-at-end 0 :internal-dur-at-end 331 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2978 :pcs-gap 0 ) true 1 0 (Tic-Visit :proposal-id 15448 :visit-id "02" :proposal-version -1 :trans-version "20171009" :date "15-Dec-2017 14:08:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "31" :si-bright-earth-limb-angle 20.0 :data-volume 52416 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15448 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15448 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2637 :al-overhead-at-end 0 :internal-dur-at-end 331 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2978 :pcs-gap 0 ) false 1 0