12462( 7) - 01-Aug-2011 10:38:00 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12462 Version: 7 Check-in Time: 01-Aug-2011 10:38:00 STScI Edit Number: 5 Title The Remarkable Young Supernova Remnant in NGC 4449 ------------------------------------------------------------------------------------ Type Cycle GO 19 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Knox S. Long Space Telescope Science Institute CoI: Dr. William P. Blair The Johns Hopkins University N CoI: Dr. P. Frank Winkler Middlebury College N CoI: Dr. Robert A. Fesen Dartmouth College N CoI: Mr. Dan Milisavljevic Dartmouth College N ------------------------------------------------------------------------------------ Abstract In the irregular galaxy NGC 4449 lies a young core-collapse supernova remnant (SNR) with remarkable optical, radio, and X-ray luminosities. With an estimated age of just 50 - 100 years, it fills an important gap in our understanding of the evolutionary development of a SNR as its forward shock and stellar debris expand into the local circumstellar environment. This is a proposal to use STIS to obtain new UV spectra of this extraordinary object, an extreme example of objects that are now making the transition from free expansion to a shock-dominated phase. Optical spectra and X-ray observations show that emission from the SNR has changed since it was observed with the FOS in 1993. We will use STIS spectra together with existing ground-based observations to (1) explore the abundances and kinematic distribution of elements in the ejecta from this core-collapse SN and compare these with nucleosynthesis models; (2) probe the interaction of the SN blast wave with what must be a very dense environment to produce its extraordinary luminosity; and (3) assess the surrounding stellar population that gave rise to this SNR. UV observations with HST are critical to a better understanding of the SNR, since this is the only way to gain access to carbon and hence measure CNO abundance ratios needed to estimate the precursor mass, and the only way to characterize shocked gas with temperatures of order 100, 000 - 300, 000 K. The combination of UV sensitivity and narrow slit to better isolate the SNR and stellar components makes STIS ideally suited to the needs of this program. ------------------------------------------------------------------------------------ Observations Description ------------------------ This project is intended to obtain spectra of a single SNR in the irregular galaxy NGC4449. We are using the FUV (G140L) and NUV (G230L) gratings with the FUV and NUV MAMA detectors, as well as the G430L grating with the CCD. Our intent is to obtain a high quality spectrum of this object from the FUV through the visible. We want also to be able to compare the spectra of the SNR to nearby HII regions and a nearby compact star cluster. We have place orientation requirements on the visits to avoid having other objects in the slit very close to the SNR and to capture the nearby star 12462( 7) - 01-Aug-2011 10:38:00 - [ 2] cluster (as we described in our Phase I proposal). Since the region is crowded, we want all of the observations to have the same slit orientation, and so have imposed SameOrient speciall requirements. We will use the 0.2 arcsec by 52 arcsec slit for all of the the observations. Because the source is relatively faint we will are using the 52X0.2E1 apeture for the CCD observation to limit the CTE effects in the CCD. Real Time Justification ----------------------- There are no realtime requirements. Calibration Justification ------------------------- There are no special calibration requirements. Additional Comments ------------------- ------------------------------------------------------------------------------------ 12462( 7) - 01-Aug-2011 10:38:00 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SNR-NGC4449 ISM, EMISSION LINE RA=12H28M10.9500S +/- 0.1", J2000 V = 18 +/- 1 NEBULA, SNR DEC=+44D06'48.60" +/- 0.1" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 12462( 7) - 01-Aug-2011 10:38:00 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type STIS-ALONG-SLIT Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.4 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 90.0 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12462( 7) - 01-Aug-2011 10:38:00 - [ 5] Visit: 01 Visit Requirements: ORIENT 101.7D TO 102.7 D On Hold Comments: Additional Comments: This visit consists of the acquisition and 3 orbits of FUV observations forllowed by one orbit of NUV observations of the SNR in NGC4449 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SNR-NGC4449 STIS/CCD ACQ F28X50OII MIRROR 1 60 S GS ACQ SCENARIO BASE1B3 I ------------------------------------------------------------------------------------------------------------------------------------ 2 SNR-NGC4449 STIS/FUV ACCUM 52X0.2 G140L 1425 2 1050 S -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 3 SNR-NGC4449 STIS/FUV ACCUM 52X0.2 G140L 1425 2 1400 S -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 4 SNR-NGC4449 STIS/FUV ACCUM 52X0.2 G140L 1425 2 1400 S -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 5 SNR-NGC4449 STIS/NUV ACCUM 52X0.2 G230L 2376 2 1400 S -MAMA ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SNR-NGC4449 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II SNR-NGC4449 2 STIS/FUV ACCUM 52X0.2 G140L 1425 none none 1 none 1 N/A -MAMA SNR-NGC4449 2 STIS/FUV ACCUM 52X0.2 G140L 1425 none none 2 none 1 N/A -MAMA SNR-NGC4449 3 STIS/FUV ACCUM 52X0.2 G140L 1425 none none 1 none 2 N/A -MAMA SNR-NGC4449 3 STIS/FUV ACCUM 52X0.2 G140L 1425 none none 2 none 2 N/A -MAMA SNR-NGC4449 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none 1 none 3 N/A -MAMA SNR-NGC4449 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none 2 none 3 N/A -MAMA SNR-NGC4449 5 STIS/NUV ACCUM 52X0.2 G230L 2376 none none 1 none 4 N/A -MAMA SNR-NGC4449 5 STIS/NUV ACCUM 52X0.2 G230L 2376 none none 2 none 4 N/A -MAMA 12462( 7) - 01-Aug-2011 10:38:00 - [ 6] Visit: 02 Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: This visit consists of the acquisition and 3 orbits of FUV observations forllowed by one orbit of NUV observations of the SNR in NGC4449. It should be identical in terms of planning to Visit 1 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SNR-NGC4449 STIS/CCD ACQ F28X50OII MIRROR 1 60 S GS ACQ SCENARIO BASE1B3 I ------------------------------------------------------------------------------------------------------------------------------------ 2 SNR-NGC4449 STIS/FUV ACCUM 52X0.2 G140L 1425 2 1050 S -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 3 SNR-NGC4449 STIS/FUV ACCUM 52X0.2 G140L 1425 2 1400 S -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 4 SNR-NGC4449 STIS/FUV ACCUM 52X0.2 G140L 1425 2 1400 S -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 5 SNR-NGC4449 STIS/NUV ACCUM 52X0.2 G230L 2376 2 1400 S -MAMA ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SNR-NGC4449 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II SNR-NGC4449 2 STIS/FUV ACCUM 52X0.2 G140L 1425 none none 1 none 1 N/A -MAMA SNR-NGC4449 2 STIS/FUV ACCUM 52X0.2 G140L 1425 none none 2 none 1 N/A -MAMA SNR-NGC4449 3 STIS/FUV ACCUM 52X0.2 G140L 1425 none none 1 none 2 N/A -MAMA SNR-NGC4449 3 STIS/FUV ACCUM 52X0.2 G140L 1425 none none 2 none 2 N/A -MAMA SNR-NGC4449 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none 1 none 3 N/A -MAMA SNR-NGC4449 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none 2 none 3 N/A -MAMA SNR-NGC4449 5 STIS/NUV ACCUM 52X0.2 G230L 2376 none none 1 none 4 N/A -MAMA SNR-NGC4449 5 STIS/NUV ACCUM 52X0.2 G230L 2376 none none 2 none 4 N/A -MAMA 12462( 7) - 01-Aug-2011 10:38:00 - [ 7] Visit: 03 Visit Requirements: SAME ORIENT AS 01 On Hold Comments: Additional Comments: This visit obtains the visible spectrum of the SNR in NGC4449 with the STIS CCD Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 SNR-NGC4449 STIS/CCD ACQ F28X50OII MIRROR 1 60 S GS ACQ SCENARIO BASE1B3 I ------------------------------------------------------------------------------------------------------------------------------------ 2 SNR-NGC4449 STIS/CCD ACCUM 52X0.2E1 G430L 4300 CR-SPLIT=NO 1 1100 S PATTERN 1 2 ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ SNR-NGC4449 1 STIS/CCD ACQ F28X50OI MIRROR none none none none 1 N/A II SNR-NGC4449 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 1 none none none 1 N/A SNR-NGC4449 2 STIS/CCD ACCUM 52X0.2E1 G430L 4300 2 none none none 1 N/A 12462( 7) - 01-Aug-2011 10:38:00 - [ 8] Summary Form for Proposal 12462 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.2, 52X0.2E1, F28X50OIII ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3, ORIENT 101.7D TO 102.7 D, PATTERN 1 2, SAME ORIENT AS 01 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, G230L, G430L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names SNR-NGC4449 ------------------------------------------------------------------------------------------------------------------------------------