Search Publications
A Rotating Disk in the HH 111 Protostellar System
Lee, Chin-Fei
The HH 111 protostellar system is a young Class I system with two sources, VLA 1 and VLA 2, at a distance of 400 pc. Previously, a flattened envelope has been seen in C18O to be in transition to a rotationally supported disk near the VLA 1 source. The follow-up study here is to confirm the rotationally supported disk at 2-3 times higher…
Hubble Space Telescope Imaging of the Outburst Site of M31 RV. II. No Blue Remnant in Quiescence
Bond, Howard E.
M31 RV is a red transient that erupted in 1988 in the Andromeda bulge, reaching a luminosity intermediate between novae and supernovae. It was cool throughout its outburst, unlike a normal classical nova. In 2006, Bond & Siegel examined archival Hubble Space Telescope (HST) optical images of the M31 RV site, obtained in 1999. We found only old…
The M81 Group Dwarf Irregular Galaxy DDO 165. I. High-velocity Neutral Gas in a Post-starburst System
Cannon, John M.; Dolphin, Andrew E.; Skillman, Evan D. +8 more
We present new multi-configuration Very Large Array H I spectral line observations of the M81 group dwarf irregular post-starburst galaxy DDO 165. The H I morphology is complex, with multiple column density peaks surrounding a large region of very low H I surface density that is offset from the center of the stellar distribution. The bulk of the n…
The ACS Nearby Galaxy Survey Treasury. VII. The NGC 4214 Starburst and the Effects of Star Formation History on Dwarf Morphology
Dolphin, Andrew E.; Skillman, Evan D.; Williams, Benjamin F. +4 more
We present deep Hubble Space Telescope WFPC2 optical observations obtained as part of the ACS Nearby Galaxy Survey Treasury as well as early release Wide Field Camera 3 ultraviolet and infrared observations of the nearby dwarf starbursting galaxy NGC 4214. Our data provide a detailed example of how covering such a broad range in wavelength provide…
XMM-Newton Observations of NGC 247: X-Ray Population and a Supersoft Ultraluminous X-Ray Source
Feng, Hua; Kaaret, Philip; Zhang, Shuang-Nan +1 more
We report on a new XMM-Newton observation of NGC 247 from 2009 December. The galaxy contains a supersoft, ultraluminous X-ray source whose spectrum consists of a thermal component with a temperature about 0.1 keV and a power-law tail with a photon index around 2.5. The thermal emission is absolutely the dominant component, contributing 96% of the …
Lateral Offset of the Coronal Mass Ejections from the X-flare of 2006 December 13 and Its Two Precursor Eruptions
Harra, Louise K.; Moore, Ronald L.; Sterling, Alphonse C.
Two GOES sub-C-class precursor eruptions occurred within ~10 hr prior to and from the same active region as the 2006 December 13 X4.3-class flare. Each eruption generated a coronal mass ejection (CME) with center laterally far offset (gsim 45°) from the co-produced bright flare. Explaining such CME-to-flare lateral offsets in terms of the standard…
The Response of A Three-dimensional Solar Atmosphere to Wave-driven Jets
Doyle, J. G.; Erdélyi, R.; Scullion, E. +1 more
Global oscillations from the solar interior are, mainly, pressure-driven (p-modes) oscillations with a peak power of a five-minute period. These oscillations are considered to manifest in many phenomena in the lower solar atmosphere, most notably, in spicules. These small-scale jets may provide the key to understanding the powering mechanisms of t…
Ultraviolet and X-ray Variability of the Seyfert 1.5 Galaxy Markarian 817
Brandt, W. N.; Schneider, Donald P.; Shull, J. Michael +9 more
We present an investigation of the ultraviolet and X-ray spectra of the Seyfert 1.5 galaxy Markarian 817. The ultraviolet analysis includes two recent observations taken with the Cosmic Origins Spectrograph (COS) in 2009 August and December, as well as archival spectra from the International Ultraviolet Explorer and the Hubble Space Telescope. Twe…
Unveiling the Mask on the ULIRG-to-QSO Transition Object [H89]1821+643 at z = 0.3: A Gas-poor/Gas-rich Galaxy Merger and the Implications for Co-based Dynamical Mass Estimates
Aravena, M.; Wagg, J.; Papadopoulos, P. P. +1 more
We report the detection of the 12CO J = 1-0 emission line in [H89]1821+643, one of the most optically luminous quasi-stellar objects (QSOs) in the local universe, and a template ULIRG-to-QSO transition object, located in a rich, cool-core cluster at z = 0.297. The CO emission is likely to be extended, highly asymmetric with respect to t…
The Globular Cluster Population of NGC 7457: Clues to the Evolution of Field S0 Galaxies
Brodie, Jean P.; Strader, Jay; Rhode, Katherine L. +1 more
In this paper, we present the results of a wide-field imaging study of the globular cluster (GC) system of the field S0 galaxy NGC 7457. To derive the global properties of the GC system, we obtained deep BVR images with the WIYN 3.5 m telescope and Minimosaic Imager and studied the GC population of NGC 7457 to a projected radius of ~30 kpc. Our gr…