Search Publications
High-Resolution Imaging of Proto-Planetary Nebulae: The Effects of Orientation
Kwok, Sun; Hrivnak, Bruce J.; Su, Kate Y. L.
Deep Hubble Space Telescope (HST) F814W images were obtained of six proto-planetary nebulae (PPNs), each of which shows a bipolar morphology but with a difference in orientation. Two of these (IRAS 17245-3951 and IRAS 22574+6609) show a dark lane separating bipolar lobes and appear to be seen approximately edge-on. The other four (IRAS 16594-4656,…
Hubble Space Telescope Observations of Dust and Star-forming Regions in the Ocular Galaxy IC 2163 and Its Spiral Companion NGC 2207
Brinks, Elias; Struck, Curtis; Elmegreen, Bruce G. +4 more
Hubble Space Telescope observations in U, B, V, and I passbands of the interacting spiral galaxies IC 2163 and NGC 2207 are used to measure extinctions in the cloud and intercloud regions and ages and luminosities of the star-forming regions. The extinction in the part of NGC 2207 seen in projection against IC 2163 was determined by using the meth…
NGC 6543: The Rings Around the Cat's Eye
Balick, Bruce; Hajian, Arsen R.; Wilson, Jeanine
Hubble archival images of NGC 6543 reveal a series of at least nine regularly spaced concentric circular rings that surround the famous nebular core, known as the Cat's Eye Nebula. The rings are almost certainly spherical bubbles of periodic isotropic nuclear mass pulsations that preceded the formation of the core. The bubbles are detected solely …
The Stellar Content of the Super-Star Clusters in NGC 1569
Aloisi, Alessandra; Leitherer, Claus; Origlia, Livia +2 more
We discuss HST Faint Object Spectrograph (FOS) ultraviolet spectroscopy and Near-Infrared Camera and Multiobject Spectrometer (NICMOS) photometry of four young super-star clusters in the central region of the irregular starburst galaxy NGC 1569. The new observations, coupled with previous HST WFPC2 photometry and ground-based optical spectroscopy,…
An XMM-Newton Detection of the Z=5.80 X-Ray-Weak Quasar SDSSP J104433.04-012502.2
Brandt, W. N.; Clavel, J.; Strauss, Michael A. +5 more
We report on an XMM-Newton observation of the most distant known quasar, SDSSp J104433.04-012502.2, at z=5.80. We have detected this quasar with high significance in the rest-frame 3.4-13.6 keV band, making it the most distant cosmic object detected in X-rays 32+/-9 counts were collected. SDSSp J104433.04-012502.2 is notably X-ray-weak relative to…
The Star Formation History of NGC 6822
Wyder, Ted K.
Images of five fields in the Local Group dwarf irregular galaxy NGC 6822 obtained with the Hubble Space Telescope in the F555W and F814W filters are presented. Three of the fields lie mostly within the central bar of NGC 6822, where most of the sites of current star formation are concentrated, while two other fields sample more of the outer region…
Multiwavelength Observations of the Low-Metallicity Blue Compact Dwarf Galaxy SBS 0335-052
Neugebauer, Gerry; Dale, Daniel A.; Soifer, B. T. +3 more
New infrared and millimeter observations from Keck, Palomar, ISO, and OVRO and archival data from the NRAO6 VLA and IRAS are presented for the low-metallicity blue compact dwarf galaxy SBS 0335-052. Mid-infrared imaging shows this young star-forming system is compact (0.31" 80 pc) at 12.5 µm. The large Brγ equivalent width (235 Å) measured f…
A Search for OH Megamasers at Z>0.1. II. Further Results
Giovanelli, Riccardo; Darling, Jeremy
We present current results of an ongoing survey for OH megamasers in luminous infrared galaxies at the Arecibo Observatory.1 The survey is now two-thirds complete, and has resulted in the discovery of 35 new OH megamasers at z>0.1, 24 of which are presented in this paper. We discuss the properties of each source in detail, including an exhausti…
A Search for H I in E+A Galaxies
Zabludoff, Ann I.; Zaritsky, Dennis; Mihos, J. Christopher +2 more
We present the results of H I line and radio continuum observations of five nearby E+A galaxies. These galaxies have spectra that are dominated by a young stellar component but lack the emission lines characteristic of significant ongoing star formation. They are selected from a unique sample of 21 E+A's identified by Zabludoff et al. in their spe…
Seeing Galaxies through Thick and Thin. IV. The Superposed Spiral Galaxies of NGC 3314
White, Raymond E., III; Keel, William C.
The superposed pair of spiral galaxies making up NGC 3314 offers a unique opportunity to trace the dust properties in a spiral galaxy. We analyze multicolor Hubble Space Telescope imaging, supported by ground-based near-IR imaging and fiber-array spectroscopy, to measure dust extinction in the foreground Sc galaxy NGC 3314A, which is backlit by th…