Search Publications
The Rotation of the Deep Solar Layers
Henney, C. J.; García, R. A.; Corbard, T. +3 more
From the analysis of low-order GOLF+MDI sectoral modes (l<=3, 6<=n<=15, |m|=l) and LOWL data (l>3), we derive the radial rotation profile by assuming no latitudinal dependence in the solar core. These low-order acoustic modes contain the most statistically significant information about the rotation of the deepest solar layers and shoul…
The Assembly of Massive Galaxies from Near-Infrared Observations of the Hubble Deep Field-South
Fontana, A.; Vanzella, E.; Cristiani, S. +7 more
We use a deep KAB<=25 galaxy sample in the Hubble Deep Field-South to trace the evolution of the cosmological stellar mass density from z~=0.5 to z~=3. We find clear evidence for a decrease of the average stellar mass density at high redshift, 2<=z<=3.5, that is 15+25-5% of the local value, 2 times higher …
Hubble Space Telescope Images of Submillimeter Sources: Large Irregular Galaxies at High Redshift
Chapman, S. C.; Conselice, C.; Yan, H. +2 more
We present new Hubble Space Telescope Space Telescope Imaging Spectrograph (STIS) high-resolution optical imaging of a sample of 13 submillimeter luminous galaxies for which the optical emission has been pinpointed either through radio 1.4 GHz or millimeter interferometry. We find a predominance of irregular and complex morphologies in the sample,…
A New Method for Estimating Widths, Velocities, and Source Location of Halo Coronal Mass Ejections
Gopalswamy, N.; Yashiro, S.; Michałek, G.
It is well known that coronagraphic observations of halo coronal mass ejections (CMEs) are subject to projection effects. Viewing in the plane of the sky does not allow us to determine the crucial parameters that define the geoeffectiveness of CMEs, such as the space speed, width, or source location. Assuming that halo CMEs have constant velocitie…
Kinematics of 10 Early-Type Galaxies from Hubble Space Telescope and Ground-based Spectroscopy
Filippenko, Alexei V.; Ho, Luis C.; Gebhardt, Karl +11 more
We present stellar kinematics for a sample of 10 early-type galaxies observed using the Space Telescope Imaging Spectrograph (STIS) aboard the Hubble Space Telescope and the Modular Spectrograph on the MDM Observatory 2.4 m telescope. These observations are a part of an ongoing program to understand the coevolution of supermassive black holes and …
Evidence for a Major Merger Origin of High-Redshift Submillimeter Galaxies
Conselice, Christopher J.; Windhorst, Rogier A.; Chapman, Scott C.
Submillimeter-detected galaxies located at redshifts z>1 host a major fraction of the bolometric luminosity at high redshifts due to thermal emission from heated dust grains, yet the nature of these objects remains a mystery. The major problem in understanding their origin is whether the dust-heating mechanism is predominantly caused by star fo…
The DEEP Groth Strip Survey. IX. Evolution of the Fundamental Plane of Field Galaxies
Illingworth, Garth D.; Weiner, Benjamin; Gebhardt, Karl +8 more
Fundamental plane studies provide an excellent means of understanding the evolutionary history of early-type galaxies. Using the Low Resolution Imaging Spectrograph on the Keck Telescope, we obtained internal stellar kinematic information for 36 field galaxies in the Groth Strip, 21 early-type and 15 disk galaxies. Their redshifts range from 0.3 t…
Constraints on the Ionization Balance of Hot-Star Winds from FUSE Observations of O Stars in the Large Magellanic Cloud
Sonneborn, G.; Massa, D.; Hutchings, J. B. +1 more
We present Far Ultraviolet Spectroscopic Explorer (FUSE) spectra for 25 O stars in the Large Magellanic Cloud. We analyze wind profiles for the resonance lines from C III, N III, S IV, P V, S VI, and O VI in the FUSE range using a ``Sobolev with exact integration'' method. In addition, the available data from either IUE or the Hubble Space Telesco…
Massive Star Formation in a Gravitationally Lensed H II Galaxy at z = 3.357
Stern, D.; Sargent, W. L. W.; Rosati, P. +9 more
The Lynx arc, with a redshift of 3.357, was discovered during spectroscopic follow-up of the z=0.570 cluster RX J0848+4456 from the ROSAT Deep Cluster Survey. The arc is characterized by a very red R-K color and strong, narrow emission lines. Analysis of HST WFPC2 imaging and Keck optical and infrared spectroscopy shows that the arc is an H II gal…
Method for Spot Detection on Solar-like Stars
Silva, Adriana V. R.
As a planet eclipses its parent star, a dark starspot may be occulted, causing a detectable variation in the light curve. This work describes how features on the surface of a solar-like star can be studied by using planetary transits. Images of the Sun were used in order to simulate such transits, with the planet being modeled as a dark disk at va…