Search Publications
XMM-Newton Observations of the Dwarf Nova RU Peg in Quiescence: Probe of the Boundary Layer
Szkody, Paula; Sion, Edward M.; Balman, Şölen +4 more
We present an analysis of X-ray and UV data obtained with the XMM-Newton Observatory of the long-period dwarf nova RU Peg. RU Peg contains a massive white dwarf (WD), possibly the hottest WD in a dwarf nova (DN), it has a low inclination, thus optimally exposing its X-ray emitting boundary layer (BL), and has an excellent trigonometric parallax di…
The most recent burst of star formation in the massive elliptical galaxy NGC 1052
Prieto, M. A.; Acosta-Pulido, J. A.; López-Sanjuan, C. +2 more
High spatial resolution near-infrared (NIR) images of the central 24 × 24 arcsec2 (∼2 × 2 kpc2) of the elliptical galaxy NGC 1052 reveal a total of 25 compact sources randomly distributed in the region. 15 of them exhibit Hα luminosities an order of magnitude above the estimate for an evolved population of extreme horizontal …
Mid- and Far-Infrared Photometry of Galactic Planetary Nebulae with the AKARI All-Sky Survey
Phillips, J. P.; Márquez-Lugo, R. A.
We provide mid- and far-infrared photometry of 857 Galactic planetary nebulae (PNe) using data derived from the AKARI All-Sky Survey. These include fluxes at 9 and 18 µm obtained with the Infrared Camera (IRC), and at 65, 90, 140 and 160 µm using the far-Infrared Surveyor (FIS). It is noted that the IR luminosities of the youngest PNe …
The History of Star Formation in Galaxy Disks in the Local Volume as Measured by the Advanced Camera for Surveys Nearby Galaxy Survey Treasury
de Jong, Roelof S.; Williams, Benjamin F.; Gilbert, Karoline M. +9 more
We present a measurement of the age distribution of stars residing in spiral disks and dwarf galaxies. We derive a complete star formation history of the ~140 Mpc3 covered by the volume-limited sample of galaxies in the Advanced Camera for Surveys (ACS) Nearby Galaxy Survey Treasury (ANGST). The total star formation rate density history…
Diffraction-Limited Subaru Imaging of M82: Sharp Mid-Infrared View of the Starburst Core
Isobe, Naoki; Gandhi, Poshak; Sakon, Itsuki +4 more
We present new imaging at 12.81 and 11.7 µm of the central ∼ 40''× 30'' (∼ 0.7 kpc × 0.5 kpc) of the starburst galaxy M 82. The observations were carried out with the COMICS mid-infrared (mid-IR) imager on the 8.2 m Subaru Telescope, and are diffraction-limited at an angular resolution of <0''.4. The images show extensive diffuse structur…
HST/COS Spectra of DF Tau and V4046 Sgr: First Detection of Molecular Hydrogen Absorption Against the Lyα Emission Line
France, Kevin; Yang, Hao; Linsky, Jeffrey L.
We report the first detection of molecular hydrogen (H2) absorption in the Lyα emission line profiles of two classical T Tauri stars (CTTSs), DF Tau and V4046 Sgr, observed by the Hubble Space Telescope/Cosmic Origins Spectrograph. This absorption is the energy source for many of the Lyman-band H2 fluorescent lines commonly s…
Star Formation Rates and Stellar Masses of Hα Selected Star-forming Galaxies at z = 0.84: A Quantification of the Downsizing
Barro, Guillermo; Pérez-González, Pablo G.; Koo, David C. +4 more
In this work we analyze the physical properties of a sample of 153 star-forming galaxies at z ~ 0.84, selected by their Hα flux with a narrowband filter. B-band luminosities of the objects are higher than those of local star-forming galaxies. Most of the galaxies are located in the blue cloud, though some objects are detected in the green valley a…
The plasma environment of Titan: The magnetodisk of Saturn near the encounters as derived from ion densities measured by the Cassini/CAPS plasma spectrometer
Thomsen, M.; Szego, K.; Nemeth, Z. +3 more
We analyze ion densities derived from the data of the Cassini Plasma Spectrometer for the time period of the prime mission till the end of May 2008, in the low latitude outer magnetosphere near Titan encounters. We have found that the central line of the magnetodisk is surrounded by a structured plasma sheet, a smooth, broad ion layer composed of …
An extended XMM-Newton observation of the Seyfert galaxy NGC 4051 - II. Soft X-ray emission from a limb-brightened shell of post-shock gas
Vaughan, S.; Pounds, K. A.
An extended XMM-Newton observation of the Seyfert 1 galaxy NGC 4051 in 2009 revealed a complex absorption spectrum, with a wide range of outflow velocities and ionization states. The main velocity and ionization structure was interpreted in Paper I in terms of a decelerating, recombining flow resulting from the shocking of a still higher velocity …
Three-dimensional Photoionization Structure and Distances of Planetary Nebulae. IV. NGC 40
Monteiro, Hektor; Falceta-Gonçalves, Diego
Continuing our series of papers on the three-dimensional (3D) structure and accurate distances of planetary nebulae (PNe), we present here the results obtained for PN NGC 40. Using data from different sources and wavelengths, we construct 3D photoionization models and derive the physical quantities of the ionizing source and nebular gas. The proce…