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Chandra observations of the nucleus of M33
Rutledge, Robert E.; Dubus, Guillaume
The nearby galaxy M33 hosts the most luminous steady X-ray source in the Local Group. The high spatial resolution of Chandra allows us to confirm that this ultra-luminous X-ray source is within the nucleus and rule out at the 4.6σ level a previously proposed possible counterpart located 1 arcsec away. The X-ray spectrum is well fitted by a disc bl…
Metric Radio Observations and Ray-tracing Analysis of the Onset Phase of a Solar Eruptive Event
Ramesh, R.; Kathiravan, C.; Subramanian, K. R.
We report metric radio observations and the results obtained using two-dimensional ray-tracing analysis of the solar corona close to the onset phase of the exceptionally bright prominence eruption and the associated massive coronal mass ejection (CME) of 1998 June 2. The average electron density of the observed radio enhancements at the location o…
Deep Hubble Space Telescope WFPC2 Photometry of NGC 288. II. The Main-Sequence Luminosity Function
Fusi Pecci, Flavio; Rood, Robert T.; Messineo, Maria +3 more
The main-sequence luminosity function (LF) of the Galactic globular cluster NGC 288 has been obtained using deep Wide Field Planetary Camera 2 photometry. We have employed a new method to correct for completeness and fully account for bin-to-bin migration due to blending and/or observational scatter. The effect of the presence of binary systems in…
Laboratory calibration of the cassini cosmic dust analyser (CDA) using new, low density projectiles
Srama, R.; Grün, E.; Müller, M. +9 more
The Cassini Cosmic Dust Analyser (CDA), developed from the Galileo and Ulysses dust instruments with the addition of a Chemical Analyser, is currently travelling outward from the Earth (collecting data from March 1999 onward) to the Saturnian system (arrival 2004) via Jupiter. The Chemical Analyser will provide information on the elemental composi…
An Efficient Strategy to Select Targets for Gasdynamical Measurements of Black Hole Masses Using the Hubble Space Telescope
Filippenko, Alexei V.; Ho, Luis C.; Shields, Joseph C. +4 more
Gasdynamical studies using the Hubble Space Telescope are an integral component for future progress in the search for massive black holes in galactic nuclei. Here we present an extensive set of gas rotation curves obtained with the Space Telescope Imaging Spectrograph for the central regions of 23 disk galaxies. We find that the bulges of randomly…
Abundances of Planetary Nebula NGC 5315
Pottasch, S. R.; Beintema, D. A.; Feibelman, W. A. +2 more
The ISO and IUE spectra of the elliptical nebula
Hiding in Plain Sight: Chandra Observations of the Quiescent Neutron Star 4U 2129+47 in Eclipse
Nowak, Michael A.; Heinz, Sebastian; Begelman, M. C.
During a previous outburst phase, the neutron star 4U 2129+47 exhibited evidence for a spatially extended accretion disk corona via broad, partial X-ray eclipses occurring periodically on the 5.24 hr orbit. Since 1983, however, 4U 2129+47 has entered a quiescent state several orders of magnitude fainter. We have performed a 37 ks (~two binary orbi…
Hubble Space Telescope NICMOS Observations of the Polarization of NGC 1068
Hines, Dean C.; Schultz, A. S. B.; Trammell, Susan R. +3 more
We have observed the polarized light at 2 µm in the center of NGC 1068 with NICMOS Camera 2 on the Hubble Space Telescope. The nucleus is dominated by a bright, unresolved source, polarized at a level of 6.0%+/-1.2% with a position angle of 122deg+/-15deg. There are two polarized lobes extending up to 8" northeast and s…
Spatially resolved STIS spectra of the gravitationally lensed broad absorption line quasar APM08279+5255: the nature of component C and evidence for microlensing
Lewis, Geraint F.; Pettini, Max; Ellison, Sara L. +4 more
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While gravitationally lensed quasars are expected to display an odd number of images, invariably systems are observed with an even number of quasars. For this, lensing galaxies must have very small core radii; this provides strong demagnification of one of the images. High-resolution imaging of the gravitationally lensed broad absorption…Balmer and He I Absorption in the Nuclear Spectrum of NGC 4151
Gull, T. R.; Kraemer, S. B.; Crenshaw, D. M. +4 more
Spectra taken with the Space Telescope Imaging Spectrograph allow accurate location and extraction of the nuclear spectrum of NGC 4151, with minimal contamination by extended line emission and circumnuclear starlight. Spectra since 1997 show that the P Cygni Balmer and He I absorption seen previously in low nuclear states is present in higher stat…