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OMCat: Catalog of Serendipitous Sources Detected with the XMM-Newton Optical Monitor

Snowden, Steven L.; Kuntz, K. D.; Mushotzky, Richard F. +2 more

The Optical Monitor Catalog of serendipitous sources (OMCat) contains entries for every source detected in the publicly available XMM-Newton Optical Monitor (OM) images taken in either the imaging or “fast” modes. Since the OM is coaligned and records data simultaneously with the X-ray telescopes on XMM-Newton, it typically produces images in one …

Radiation Effects on Stressed Ge:Ga Array Detector of Far-Infrared Surveyor on AKARI

Nakagawa, Takao; Shirahata, Mai; Doi, Yasuo +6 more

AKARI, the Japanese infrared astronomical satellite, was launched on 2006 February 21 (UT) and put into a sun-synchronous polar orbit at an altitude of 700 km. Cosmic radiations, particularly protons in the South Atlantic Anomaly (SAA), were expected to affect the performance of the stressed Ge:Ga array far-infrared detector on board AKARI. One of…

Far-Ultraviolet Spectral Analysis of the Prototype Nova-like Variable VY Sculptoris from the High State to the Low State

Sion, Edward M.; Hamilton, Ryan T.

The prototype nova-like variable VY Sculptoris was observed by the IUE during four different optical brightness states of the system. The far-ultraviolet (FUV) flux level from the highest state to the lowest state declines by a factor of 28. We have carried out model accretion disk and white dwarf atmosphere fitting to the spectra. The correspondi…

Late-Time HST Photometry of SN 1994I: Hints of Positron Annihilation Energy Deposition

Filippenko, Alexei V.; Garnavich, Peter; Fransson, Claes +12 more

We present multicolor Hubble Space Telescope (HST) WFPC2 broadband observations of the Type Ic SN 1994I obtained ∼280 d after maximum light. We measure the brightness of the SN and, relying on the detailed spectroscopic database of SN 1994I, we transform the ground-based photometry obtained at early times to the HST photometric system, deriving li…

A Cosmologically Motivated Description of the Dark Matter Halo Profile for the Low Surface Brightness Galaxy, Malin 1

Seigar, Marc S.

In this paper we derive a possible mass profile for the low surface brightness galaxy, Malin 1, based upon previously published space-based and ground-based photometric properties and kinematics. We use properties of the bulge, normal disk, outer extended disk, and H i mass as inputs into mass profile models. We find that the dark matter halo mode…

Study of Long-lived Radioactive Sources in the Galaxy with INTEGRAL/SPI

Wang, Wei

Principal Component Analysis of the Time- and Position-dependent Point-Spread Function of the Advanced Camera for Surveys

Ford, H. C.; Jee, M. J.; Blakeslee, J. P. +3 more

We describe the time- and position-dependent point-spread function (PSF) variation of the wide-field channel (WFC) of the Advanced Camera for Surveys (ACS) with the principal component analysis (PCA) technique. The time-dependent change is caused by the temporal variation of the HST focus, whereas the position-dependent PSF variation in ACS WFC at…

Hubble Space Telescope Advanced Camera for Surveys Mosaic of the Prototypical Starburst Galaxy M82

Gallagher, J. S.; Bond, H. E.; Noll, K. S. +9 more

In 2006 March, the Hubble Heritage Team obtained a large, four-filter (B, V, I, and Hα), 6 point mosaic data set of the prototypical starburst galaxy NGC 3034 (M82) with the Advanced Camera for Surveys on board the Hubble Space Telescope (HST). The resulting color composite Heritage image was released in 2006 April to celebrate HST's 16th annivers…

Near-Ultraviolet Spectra of Flares on YZ CMi

Hawley, Suzanne L.; Valenti, Jeff A.; Walkowicz, Lucianne M. +1 more

Near-ultraviolet spectroscopic data obtained with the Hubble Space Telescope STIS (Space Telescope Imaging Spectrograph) instrument on the dMe flare star YZ Canis Minoris (YZ CMi) were analyzed. Flare and quiet intervals were identified from the broadband near-UV light curve, and the spectrum of each flare was separately extracted. Mg II and Fe II…

A Hubble Space Telescope Survey of the Disk Cluster Population of M31. I. WFPC2 Pointings

Hodge, P. W.; Krienke, O. K.

As a follow-up to the automated cluster search carried out by Williams & Hodge, we have examined 39 Hubble Space Telescope Wide Field Planetary Camera 2 (WFPC2) pointings to locate and study a comprehensive collection of disk clusters. The Williams technique was effective in finding young clusters, but not intermediate-age or old clusters. Our…