! $Id: 5192,v 4.1 1994/07/27 15:50:47 pepsa Exp $ coverpage: title_1: EARLY RELEASE OBSERVATIONS OF MKN231 sci_cat: QUASARS & AGN sci_subcat: HOST GALAXIES proposal_for: SMC/ERO pi_title: DR. pi_fname: WILLIAM pi_lname: SPARKS pi_inst: STSCI pi_country: USA hours_pri: 1.74 num_pri: 1 wf_pc: Y ! end of coverpage abstract: line_1: Markarian 231 is an extraordinary galaxy that shows a brilliant stellar line_2: nucleus superimposed on a disturbed disk-like structure, from which two line_3: tails emerge. The object appears to represent a transition between a line_4: galaxy and a quasar and will be useful to assess the utility of the line_5: refurbished HST in determining host galaxy morphology around quasars line_6: and to explore the high dynamic range of WFPC2. ! ! end of abstract general_form_proposers: lname: SPARKS fname: WILLIAM title: DR. inst: 3470 country: USA esa: N ! lname: GALLAGHER fname: JAY title: DR. mi: S. inst: 3884 country: USA esa: N ! lname: LYNDS fname: ROGER title: DR. inst: 2902 country: USA esa: N ! lname: MACKENTY fname: JOHN title: DR. mi: W. inst: 3470 country: USA esa: N ! ! end of general_form_proposers block general_form_text: question: 2 section: 1 line_1: Markarian 231: Transition between Galaxy and Quasar line_3: Markarian 231 is an extraordinary galaxy that combines a variety of unusual line_4: features in one extragalactic system. Optical images of Mrk 231 show a line_5: brilliant stellar nucleus superimposed on a disturbed disk-like structure, from line_6: which two tails emerge. The optical extent is about 70 arcsec, corresponding line_7: to 60 kpc for a distance of 165 Mpc. Mrk 231 thus looks like the remnant of a line_8: recent merger between disk galaxies. line_10: The nucleus of Mrk 231 is either an extremely luminous Seyfert 1 object or a line_11: small quasar, and has the characteristic spectrum of an AGN with time variable, line_12: broad emission and absorption spectral features. IRAS observations set a lower line_13: limit of about 2 x 10** 12 Lo for the power output of Mrk 231, most of which is line_14: thought to come from the nucleus. One way that the nuclear properties of Mrk line_15: 231 can be explained is by hypothesizing that this system is in a transitional line_16: evolutionary state and in the future will appear to be a normal quasar. Mrk 231 line_17: can then be thought of as one of the nearest examples of a key evolutionary line_18: process that produces quasars in galaxies. line_20: HST ERO observations of Mrk 231 will probe the inner regions of line_21: the system, where a resolution of 80 pc can be achieved with the PC on WFPC2. line_22: We suggest that observations be made over a long color baseline, with line_23: measurements in the U, V, and I filters to aid in distinguishing between dust ! question: 2 section: 2 line_1: and stellar features. By taking advantage of the high dynamic range of the line_2: WFPC2, we will image the immediate setting of a young quasar, and will use the line_3: resulting information to address the relationship between the quasar and its line_4: host galaxy, and to search for jets or other indications of hydrodynamical line_5: interactions between the nucleus and its surroundings. For these reason we line_6: suggest that a range of exposure times be used. ! question: 3 section: 1 line_1: Short description of proposed observations line_3: We propose to obtain U, V and I images. ! question: 4 section: 1 line_1: (a) Justify the need for the capabilities if HST. line_3: Host galaxies of quasars require sensitivity and resolution. line_7: (b) Justify the amount of exposure time. line_11: Short and long exposures needed to avoid saturation while also line_12: seeing host galaxy. ! question: 5 section: 1 line_1: Special Scheduling ! question: 6 section: 1 line_1: Special calibrations line_3: None ! question: 7 section: 1 line_1: Data reduction and analysis line_3: The data will be rapidly processed for early assessment of the HST recovery. ! !end of general form text general_form_address: lname: Sparks fname: William title: Dr. category: PI inst: STScI addr_1: 3700 San Martin city: BALTIMORE state: MD zip: 21218 country: USA phone: 410-338-4827 telex: 410-338-1592 from_date: 21-MAR-88 to_date: 21-MAR-98 ! ! end of general_form_address records fixed_targets: targnum: 1 name_1: UGC8058 name_2: MARK231 descr_1: E,312 pos_1: PLATE-ID=01R1, pos_2: RA= 12H 56M 14.0S +/- 1.0", pos_3: DEC= +56D 52' 24.0" +/- 1" equinox: 2000 rv_or_z: V = +12300 fluxnum_1: 1 fluxval_1: V = 14.00 +/- 0.5 ! ! end of fixed targets ! No solar system records found ! No generic target records found exposure_logsheet: linenum: 1.000 targname: UGC8058 config: WFPC2 opmode: IMAGE aperture: PC1 sp_element: F785LP num_exp: 2 time_per_exp: 10S s_to_n: 30 fluxnum_1: 1 priority: 1 param_1: CR-SPLIT=NO req_1: CYCLE 4/1-5 ! linenum: 2.000 targname: UGC8058 config: WFPC2 opmode: IMAGE aperture: PC1 sp_element: F555W num_exp: 2 time_per_exp: 30S s_to_n: 30 fluxnum_1: 1 priority: 1 param_1: CR-SPLIT=NO ! linenum: 3.000 targname: UGC8058 config: WFPC2 opmode: IMAGE aperture: PC1 sp_element: F336W num_exp: 2 time_per_exp: 300S s_to_n: 30 fluxnum_1: 1 priority: 1 param_1: CR-SPLIT=NO ! linenum: 4.000 targname: UGC8058 config: WFPC2 opmode: IMAGE aperture: PC1 sp_element: F785LP num_exp: 2 time_per_exp: 180S s_to_n: 30 fluxnum_1: 1 priority: 1 param_1: CR-SPLIT=NO ! linenum: 5.000 targname: UGC8058 config: WFPC2 opmode: IMAGE aperture: PC1 sp_element: F555W num_exp: 2 time_per_exp: 300S s_to_n: 30 fluxnum_1: 1 priority: 1 param_1: CR-SPLIT=NO ! ! end of exposure logsheet ! No scan data records found