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Hubble Space Telescope Observations of the HD 202628 Debris Disk
Krist, John E.; Stapelfeldt, Karl R.; Plavchan, Peter +1 more
A ring-shaped debris disk around the G2V star HD 202628 (d = 24.4 pc) was imaged in scattered light at visible wavelengths using the coronagraphic mode of the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. The ring is inclined by ~64° from face-on, based on the apparent major/minor axis ratio, with the major axis aligned along…
A Deep, Wide-field, and Panchromatic View of 47 Tuc and the SMC with HST: Observations and Data Analysis Methods
Anderson, Jay; Dotter, Aaron; Rich, R. M. +10 more
In Hubble Space Telescope (HST) Cycle 17, we imaged the well-known globular star cluster 47 Tucanae for 121 orbits using the Wide Field Channel of the Advanced Camera for Surveys (ACS) and both the UV/visible (UVIS) and IR channels of the newly installed Wide Field Camera 3 (WFC3) instrument (GO-11677, PI: H. Richer). This unique data set was obta…
The Spectral Energy Distributions of White Dwarfs in 47 Tucanae: The Distance to the Cluster
Anderson, J.; Tremblay, P. -E.; Stetson, P. B. +13 more
We present a new distance determination to the Galactic globular cluster 47 Tucanae by fitting the spectral energy distributions of its white dwarfs (WDs) to pure hydrogen atmosphere WD models. Our photometric data set is obtained from a 121-orbit Hubble Space Telescope program using the Wide Field Camera 3 UVIS/IR channels, capturing F390W, F606W…
Further Evidence for Large Central Mass-to-light Ratios in Early-type Galaxies: The Case of Ellipticals and Lenticulars in the A262 Cluster
Saglia, R. P.; Thomas, J.; Bender, R. +3 more
We present new radially resolved spectroscopy of eight early-type galaxies in the A262 cluster. The measurements include stellar rotation, velocity dispersion, H 3 and H 4 coefficients of the line-of-sight velocity distribution along the major and minor axes and an intermediate axis as well as line-strength index profiles of …
Water Ice in the Kuiper Belt
Brown, M. E.; Schaller, E. L.; Fraser, W. C.
We examine a large collection of low-resolution near-infrared spectra of Kuiper Belt objects (KBOs) and centaurs in an attempt to understand the presence of water ice in the Kuiper Belt. We find that water ice on the surface of these objects occurs in three separate manners: (1) Haumea family members uniquely show surfaces of nearly pure water ice…
Speckle Interferometry and Orbits of "Fast" Visual Binaries
Tokovinin, Andrei
Results of speckle observations at the 4.1 m SOAR telescope in 2012 (158 measures of 121 systems, 27 non-resolutions) are reported. The aim is to follow fast orbital motion of recently discovered or neglected close binaries and sub-systems. Here, eight previously known orbits are defined better, two more are completely revised, and five orbits are…
The Stellar and Gas Kinematics of the LITTLE THINGS Dwarf Irregular Galaxy NGC 1569
Brinks, Elias; Hunter, Deidre A.; Johnson, Megan +5 more
In order to understand the formation and evolution of Magellanic-type dwarf irregular (dIm) galaxies, one needs to understand their three-dimensional structure. We present measurements of the stellar velocity dispersion in NGC 1569, a nearby post-starburst dIm galaxy. The stellar vertical velocity dispersion, σz, coupled with the maximu…
PAndromeda—First Results from the High-cadence Monitoring of M31 with Pan-STARRS 1
Price, P. A.; Saglia, R. P.; Chambers, K. C. +19 more
The Pan-STARRS 1 (PS1) survey of M31 (PAndromeda) is designed to identify gravitational microlensing events, caused by bulge and disk stars (self-lensing) and by compact matter in the halos of M31 and the Milky Way (halo lensing or lensing by massive compact halo objects). With the 7 deg2 field of view (FOV) of PS1, the entire disk of M…
AKARI Infrared Camera Survey of the Large Magellanic Cloud. I. Point-source Catalog
Onaka, Takashi; Tanabé, Toshihiko; Ita, Yoshifusa +10 more
We present a near- to mid-infrared point-source catalog of five photometric bands at 3.2, 7, 11, 15, and 24 µm for a 10 deg2 area of the Large Magellanic Cloud (LMC) obtained with the Infrared Camera on board the AKARI satellite. To cover the survey area the observations were carried out at three separate seasons from 2006 May to …
An Inverse Compton Scattering Origin of X-Ray Flares from Sgr A*
Genzel, R.; Heinke, C. O.; Grosso, N. +6 more
The X-ray and near-IR emission from Sgr A* is dominated by flaring, while a quiescent component dominates the emission at radio and submillimeter (sub-mm) wavelengths. The spectral energy distribution of the quiescent emission from Sgr A* peaks at sub-mm wavelengths and is modeled as synchrotron radiation from a thermal population of electrons in …