Search Publications
Seeing Galaxies through Thick and Thin. III. Hubble Space Telescope Imaging of the Dust in Backlit Spiral Galaxies
White, Raymond E., III; Keel, William C.
We present analysis of Wide Field Planetary Camera 2 imaging of two spiral galaxies partially backlit by elliptical or S0 systems in the pairs AM 1316-241 and AM 0500-620, as well as the (probably spiral) foreground system in NGC 1275. Images in B and I are used to determine the reddening curve of dust in these systems. The foreground spiral compo…
Statistical Properties of Ultraluminous IRAS Galaxies from an HST Imaging Survey
Mao, S.; Cui, J.; Xia, X. -Y. +2 more
We perform photometric measurements on a large HST snapshot imaging survey sample of 97 ultraluminous infrared galaxies (ULIRGs). We select putative nuclei from bright clumps in all the sample targets, mainly based on a quantitative criterion of I-band luminosity as well as the global and local morphological information. All the sources are then c…
The Tolman Surface Brightness Test for the Reality of the Expansion. IV. A Measurement of the Tolman Signal and the Luminosity Evolution of Early-Type Galaxies
Sandage, Allan; Lubin, Lori M.
We review a sample of the early literature in which the reality of the expansion is discussed. Hubble's reluctance, even as late as 1953, to accept the expansion as real is explained as due to his use of equations for distances and absolute magnitudes of redshifted galaxies that do not conform to the modern Mattig equations of the standard model. …
3C 236: Radio Source, Interrupted?
Koekemoer, Anton M.; Baum, Stefi A.; O'Dea, Christopher P. +5 more
We present new Hubble Space Telescope Space Telescope Imaging Spectrograph MAMA near-UV images and archival Wide Field Planetary Camera 2 (WFPC2) V- and R-band images that reveal the presence of four star-forming regions in an arc along the edge of the dust lane in the giant (4 Mpc) radio galaxy 3C 236. Two of the star-forming regions are relative…
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…