Search Publications
X-Ray Warm Absorption and Emission in the Polar-scattered Seyfert 1 Galaxy Mrk 704
Dewangan, Gulab C.; Laha, Sibasish; Kembhavi, Ajit K.
We present a detailed study of the ionized environment of the Seyfert 1 galaxy Mrk 704 using medium- and high-resolution X-ray spectra obtained with a long XMM-Newton observation. The 0.3-10 keV continuum, well described by a power law (Γ ≈ 1.86) and two blackbodies (kT ≈ 0.085 and 0.22 keV), is found to be affected by a neutral partial covering a…
The 2006 Outburst of the Magnetar CXOU J164710.2 - 455216
Kaspi, Victoria M.; Woods, Peter M.; Gavriil, Fotis P. +1 more
We report on data obtained with the Chandra, XMM-Newton, Suzaku, and Swift X-ray observatories, following the 2006 outburst of the Anomalous X-ray Pulsar CXOU J164710.2-455216. Using a more complete and higher signal-to-noise data set, we find no evidence for the very large glitch and rapid exponential decay as was reported previously for this sou…
The UV-continuum Properties of Lyα-selected Galaxies at z = 6.5
Cowie, Lennox L.; Hu, Esther M.; Songaila, Antoinette
We report the first space-based very deep near-infrared continuum observations of a uniform sample of z = 6.5 galaxies with log(L(Lyα)) = 42.5-43 erg s-1 selected from narrowband line searches and with spectroscopically confirmed Lyα emission. The 1.4 µm Hubble Space Telescope WFC3 observations are deep enough (AB(1σ) = 28.75) to …
Spectroscopic Analysis of Interaction between an Extreme-ultraviolet Imaging Telescope Wave and a Coronal Upflow Region
Ding, M. D.; Chen, P. F.; Harra, L. K. +1 more
We report a spectroscopic analysis of an EUV Imaging Telescope (EIT) wave event that occurred in active region 11081 on 2010 June 12 and was associated with an M2.0 class flare. The wave propagated nearly circularly. The southeastern part of the wave front passed over an upflow region near a magnetic bipole. Using EUV Imaging Spectrometer raster o…
Strong Variable Ultraviolet Emission from Y Gem: Accretion Activity in an Asymptotic Giant Branch Star with a Binary Companion?
Gil de Paz, Armando; Neill, James D.; Sahai, Raghvendra +1 more
Binarity is believed to dramatically affect the history and geometry of mass loss in asymptotic giant branch (AGB) and post-AGB stars, but observational evidence of binarity is sorely lacking. As part of a project to look for hot binary companions to cool AGB stars using the Galaxy Evolution Explorer archive, we have discovered a late-M star, Y Ge…
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 …