Search Publications
Diffuse Far-UV Line Emission from the Low-redshift Lyman Break Galaxy Analog KISSR242
Leitherer, Claus; France, Kevin; Nell, Nicholas +1 more
We present new ultraviolet (UV) observations of the luminous compact blue galaxy KISSR242, obtained with the Hubble Space Telescope-Cosmic Origins Spectrograph (HST-COS). We identify multiple resolved sub-arcsecond near-UV sources within the COS aperture. The far-UV spectroscopic data show strong outflow absorption lines, consistent with feedback …
The column density towards LMC X-1
Nowak, M. A.; Wilms, J.; Barragán, L. +2 more
We measure the neutral absorption towards the black hole X-ray binary system LMC X-1 from six archival soft X-ray spectra obtained with the gratings and/or CCD detectors on Chandra, XMM-Newton, and Swift. Four spectral models for the soft continuum are investigated. While the powerlaw model may overestimate N_H considerably, the others give consis…
Martian Cratering 10. Progress in use of crater counts to interpret geological processes: Examples from two debris aprons
Werner, Stephanie C.; Hartmann, William K.
Recent controversies about systems of crater-count dating have been largely resolved, and with continuing refinements, crater counts will offer a fundamental geological tool to interpret not only ages, but also the nature of geological processes altering the surface of Mars. As an example of the latter technique, we present data on two debris apro…
Dynamics of the Flaring Loop System of 2005 August 22 Observed in Microwaves and Hard X-rays
Melnikov, V. F.; Shibasaki, K.; Ji, H. +1 more
We studied the spatial dynamics of the flaring loop in the 2005 August 22 event using microwave (NoRH) and hard X-ray (RHESSI) observations together with complementary data from SOHO/MDI, SMART at Hida, SOHO/EIT, and TRACE. We have found that (1) the pre-flare morphology of the active region exhibits a strongly sheared arcade seen in Hα and the J-…
High-resolution spectroscopic study of red clump stars in the Galaxy: iron-group elements
Ilyin, I.; Tautvaišienė, G.; Cohen, J. G. +4 more
The main atmospheric parameters and abundances of the iron-group elements (vanadium, chromium, iron, cobalt and nickel) are determined for 62 red giant `clump' stars revealed in the Galactic field by the Hipparcos orbiting observatory. The stars form a homogeneous sample with the mean value of temperature Teff = 4750 +/- 160K, of surfac…
Herschel-PACS spectroscopy of the intermediate mass protostar NGC 7129 FIRS 2
de Graauw, Th.; Liseau, R.; Braine, J. +58 more
Aims: We present preliminary results of the first Herschel spectroscopic observations of NGC 7129 FIRS2, an intermediate mass star-forming region. We attempt to interpret the observations in the framework of an in-falling spherical envelope.
Methods: The PACS instrument was used in line spectroscopy mode (R = 1000-5000) with 15 spectral …
Metallicity of the Fossil Group NGC 1550 Observed with Suzaku
Sato, Kosuke; Nakazawa, Kazuhiro; Ohashi, Takaya +4 more
We studied the temperature and metal abundance distributions of the intra-cluster medium (ICM) in a group of galaxies, NGC 1550, observed with Suzaku. NGC 1550 is classified as a fossil group, which has few bright member galaxies, except for the central galaxy. Thus, such a type of galaxy is important to investigate how metals are enriched to the …
Occultation Observations of Saturn's B Ring and Cassini Division
French, Richard G.; Marouf, Essam A.; McGhee, Colleen A. +1 more
The outer edge of Saturn's B ring is strongly affected by the nearby 2:1 inner Lindblad resonance of Mimas and is distorted approximately into a centered elliptical shape, which at the time of the Voyager 1 and 2 encounters was oriented with its periapse toward Mimas. Subsequent observations have shown that the actual situation is considerably mor…
A spectroscopic survey of faint, high-Galactic-latitude red clump stars. I. The high resolution sample
Valentini, M.; Munari, U.
Context. Their high intrinsic brightness and small dispersion in absolute magnitude make red clump (RC) stars a prime tracer of Galactic structure and kinematics.
Aims: We aim to derive accurate, multi-epoch radial velocities and atmospheric parameters (Teff, log g, [M/H], Vrot sin i) of a large sample of carefully selec…
Total solar irradiance absolute level from DIARAD/SOVIM on the International Space Station
Mekaoui, Sabri; Dewitte, Steven; Conscience, Christian +1 more
Current measurements from DIARAD/VIRGO, PMO6V/VIRGO and ACRIM3 radiometers are of the same order of magnitude, but differ from TIM/SORCE by about 4.5 W m -2. This difference is higher than the sum of the claimed individual absolute uncertainties of the instruments. In this context, the SOLAR payload on the International Space Station em…