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Stsci Newsletter: 1991 Volume 008 Issue 03

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SPACE 'fEIFSCOPE SOENCE ...______._.INSTITUIE Operated for NASA by AURA November 1991 Vol. 8No. 3 HIGHLIGHTS OF THIS ISSUE: HSTSCIENCE HIGHLIGHTS WF/PC OBSERVATIONS OF THE STELLAR O NEW SCIENCE RESULTS ON M87, CRAB PULSAR CUSP IN M87 O COSTAR PROGRESSING WELL The photograph on the left shows one of a set of images of the central regions of the giant ellipti­ O ANSWERS TO YOUR QUESTIONS ABOUT HST DATA cal galaxy M87, obtained in June 1991 withHSI's Wide Field and Planetary Camera {WF/PC). 0 CYCLE 2 PEER REVIEW UNDERWAY Analysis of these images has revealed a stellar cusp in the core of M87, consistent with the pres­ ence of a massive black hole in its nucleus. A combined approach of image deconvolution and modelling has made it possible to investigate the starlight distribution in M87 down to a limiting radius of about 0'.'04 from the nucleus (or about 3 pc from the nucleus if the Virgo cluster is at 16 Mpc). The results show that the central struc­ ture of M87 can be described by three compo­ nents: a power-law starlight profile with an r·114 slope which continues unabated into the center, an unresolved central point source, and optical coun­ terparts of the jet knots identified by VLBI obser­ vations. In both the V- and /-band Planetary Camera images, the stellar cusp is consistent with the black-hole model proposed for M87 by Young et al. in 1978; in this model, there is a central mas­ sive object of about 3 x 109 Me. The central luminosity spike remains unre­ solved with the Planetary Camera, and is at least as blue as the rest of the M87 jet In a paper report­ ing these results (now in press in The Astronomi­ cal Journal), the WF/PC Investigation Definition Team (IDT) argues that the central spike is entirely due to nonthermal (synchrotron) radiation. A near-infrared (F785LP) image of the nuclear regions andjet of the giant el­ The WF/PC images, as well as recent Faint liptical galaxy M87, obtained with HSI' s Planetary Camera. The image has Object Camera (FOC) images, also show M87's been deconvolved with 80 iterations of the Richardson-Lucy algorithm. The well-known jet with unprecedented optical resolu- area shown is 293 by 24.6 arcseconds, and the exposure time was 1400 s. Note especially the compact nature of the central lwninosity spike. The other com­ pact sources scattered about the image are globular clusters in M87. The un­ precedented resolution of the HST image makes it possible to determine the Subscribers- distribution of starlight further into the nucleus than has been possible from Don'tforget to renew your subscription. ground-based data. This distribution is consistent with the presence ofa 3-bil­ A renewal form is on the last page of this issue. lion-solar-mass black hole at the center of M87. Courtesy of the WF!PC In­ vestigation Definition Team. SPACE TELESCOPE SCIENCE INSTITUTE NEWSLEITER NOVEMBER 1991 PAGE2 tion. The FOC and WF/PC. data will be dis­ HSTSclence Hlghllghts cussed at the upcoming American Astro­ WF/PC, Observations of the Stellar Cusp in M87 ......................................................... 1 nomical Society meeting in Atlanta. HSP Observations of the Crab Pulsar .......................................................................... 2 HST Scientific Program Makes Substantial Progress ................................................... 2 -Tod Lauer The HSTObservatory From the Director's Office .. ......................................................................................... 3 HSP OBSERVATIONS OF THE HST's Observing Efficiency ......................................................................................... 4 CRAB PULSAR COSTAR Progress ....................................................................................................... 6 HST Spacecraft Operational Status .............................................................................. 7 In late October, the High Speed Pho­ HST Gyros ................................................................................................................... 8 tometer (HSP) team obtained photometry Optical Telescope Assembly Collimation .................................................................... 9 of the optical pulsar in the Crab Nebula. These data demonstrate the capabilities Scientific Instruments of HSP to observe short-timescale Wide Field and Planetary Camera ................................................................................ 9 Faint Object Camera .................................................................................................. 11 phenomena free of the effects of atmo­ Faint Object Spectrograph ......................................................................................... 11 spheric scintillation. Goddard High Resolution Spectrograph .................................................................... 12 The observations were taken through A Comparison of GHRS and FOS Sensitivities ......................................................... 13 the F400LP filter with image-dissector tube High Speed Photometer ............................................................................................. 13 3, with a sample time of 10.74 microsec­ Fine Guidance Sensors ............................................................................................... 14 onds. A total of 703,244,160 samples was News for HSTObservers and Proposers collected during four intervals of about half Frequently Asked Questions about HST Data and Data Analysis .............................. 14 an hour each. Each interval covered about User's Guide to the STScl .......................................................................................... 15 50,000 rotations of the pulsar. The sample Observation Problem Reports .................................................................................... 15 arrival times were adjusted for the motion WF/PC,-Assisted Early Acquisitions .......................................................................... 16 Users' Committee Meets ............................................................................................ 16 of the Earth about the barycenter of the so­ STAC Meeting .......................................................................................................... 17 lar system using the JPL DE-200 Planetary STEIS Usage Increases Five-Fold ............................................................................. 17 Ephemeris, and for the motion of HST How to Obtain Archival Data .................................................................................... 18 about the Earth using the SOGS predictive Proprietary Status of HST Calibration Data ............................................................... 18 ephemeris. An additional adjustment, ten­ An HST User Survey: The Proposal Submission System ........................................... 18 Publication of HST Research ..................................................................................... 19 tatively identified as the difference between Published HST Papers .................................. .............................................................. 20 the true HSP clock frequency and the manufacturer's specification value, has Proposal News also been made. Cycle 2 Peer Review Underway ................................................................................ 19 In the accompanying figure, data cover­ Approved Director's Discretionary Programs ............................................................. 22 ing one half-hour have been phased onto Software News the known rotational period (33.396206 STSDAS News .......................................................................................................... 22 milliseconds) of the pulsar. The main pulse AURA News and the interpulse are shown with very high AURA Appoints New Vice President ........................................................................ 22 S/N. Details of the light curve, such as the Board Member to Serve on Presidential Science Committee ..................................... 22 luminosity between pulses and the pulse artalyzed Hubble Fellowship Program structure, are being now. Third Selection Cycle Underway ............................................................................... 22 The HSP team will make more high­ First Hubble Symposium ........................................................................................... 22 speed observations of this object in both broad and narrow wavelength bands in . Institute News the visual and ultraviolet regions of A Digital All-Sky Survey .......................................................................................... 23 the spectrum. Year of First Light Proceedings Available ................................................................. 24 October Mini-Workshop ............................................................................................ 24 -Bob Bless & Jeff Percival Workshop on Status of Women in Astronomy ........................................................... 24 Sabbatical & Long-Term Visitors at STScl ............................................................... 24 Recent Staff Changes ................................................................................................. 24 HSTSCIENTIFIC PROGRAM Recent STScl Preprints .............................................................................................. 25 MAKES SUBSTANTIAL PROGRESS Graduate Student Research Assistantships ................................................................
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