Search Publications
The Detailed Fundamental Plane of Two High-Redshift Clusters: MS 2053-04 at z=0.58 and MS 1054-03 at z=0.83
van Dokkum, Pieter G.; Franx, Marijn; Kelson, Daniel D. +2 more
We study the fundamental plane relation in high-redshift clusters using a sample of 26 galaxies in MS 2053-04 (z=0.583) and 22 galaxies in MS 1054-03 (z=0.83). The zero point and scatter are compared to results for lower redshift clusters in order to trace evolutionary effects. Furthermore, our large sample enables us to investigate correlations b…
Probing the Intergalactic Medium-Galaxy Connection toward PKS 0405-123. I. Ultraviolet Spectroscopy and Metal-Line Systems
Weiner, Benjamin J.; Chen, Hsiao-Wen; Howk, J. Christopher +2 more
We present results from an analysis of FUSE spectroscopy of the zem=0.57 quasar PKS 0405-123. We focus on the intervening metal-line systems identified along the sight line and investigate their ionization mechanism, ionization state, and chemical abundances. Including Hubble Space Telescope STIS spectroscopy, we survey the entire sight…
A Possible New Population of Sources with Extreme X-Ray/Optical Ratios
Koekemoer, Anton M.; Alexander, D. M.; Bauer, F. E. +13 more
We describe a possible new class of X-ray sources that have robust detections in ultradeep Chandra data yet have no detections at all in our deep multiband Great Observatories Origins Deep Survey Hubble Space Telescope Advanced Camera for Surveys (ACS) images, which represent the highest quality optical imaging obtained to date on these fields. Th…
ISO observations of the Galactic center interstellar medium. Neutral gas and dust
Rodríguez-Fernández, N. J.; Martín-Pintado, J.; Fuente, A. +1 more
The 500 central pc of the Galaxy (hereafter GC) exhibit a widespread gas component with a kinetic temperature of 100-200 K. The bulk of this gas is not associated to the well-known thermal radio continuum or far infrared sources like Sgr A or Sgr B. How this gas is heated has been a longstanding problem. With the aim of studying the thermal balanc…
Coronal Mass Ejection of 15 May 2001: I. Evolution of Morphological Features of the Eruption
Maričić, D.; Vršnak, B.; Stanger, A. L. +1 more
We study the initiation and development of the limb coronal mass ejection (CME) of 15 May 2001, utilizing observations from Mauna Loa Solar Observatory (MLSO), the Solar and Heliospheric Observatory (SOHO), and Yohkoh. The pre-eruption images in various spectral channels show a quiescent prominence imbedded in the coronal void, being overlaid by t…
Far-infrared and submillimetre observations of the Crab nebula
Tuffs, R. J.; Popescu, C. C.; Green, D. A.
We present far-infrared (FIR) and submillimetre images of the Crab nebula, taken with the ISOPHOT instrument onboard the Infrared Space Observatory (ISO) and with the Submillimetre Common-User Bolometer Array (SCUBA) on the James Clerk Maxwell Telescope. The ISOPHOT observations were made in the bands centred at 60, 100 and 170 µm, with FWHM…
A Population of Massive Globular Clusters in NGC 5128
Ho, Luis C.; Martini, Paul
We present velocity dispersion measurements of 14 globular clusters in NGC 5128 (Centarus A) obtained with the MIKE echelle spectrograph on the 6.5 m Magellan Clay telescope. These clusters are among the most luminous globular clusters in NGC 5128 and have velocity dispersions comparable to the most massive clusters known in the Local Group, rangi…
Identification of Type Ia Supernovae at Redshift 1.3 and Beyond with the Advanced Camera for Surveys on the Hubble Space Telescope
Dickinson, Mark; Ferguson, Henry C.; Giavalisco, Mauro +15 more
We present discoveries of Type Ia supernovae (SNe Ia) at z>1 and the photometric diagnostic used to discriminate them from other types of SNe detected during the Great Observatories Origins Deep Survey (GOODS) Hubble Space Telescope Treasury Program with the Advanced Camera for Surveys (ACS). Photometric redshift measurements of the hosts combi…
ISOCAM survey and dust models of 3CR radio galaxies and quasars
Siebenmorgen, R.; Haas, M.; Freudling, W. +1 more
We present a survey of all 3CR sources imaged with ISOCAM onboard the Infrared Space Observatory (ISO). The sample consists mostly of radio-loud active galactic nuclei (AGN). For each source, we present spatially integrated mid-infrared (MIR, 5-18 µm) fluxes measured from newly calibrated ISOCAM images. In total, we detected 68 objects of th…
Transition region small-scale dynamics as seen by SUMER on SOHO
Doyle, J. G.; Madjarska, M. S.; Teriaca, L. +2 more
High spectral, spatial and temporal resolution UV observations of the quiet Sun transition region show a highly structured and dynamical environment where transient supersonic flows are commonly observed. Strongly non-Gaussian line profiles are the spectral signatures of these flows and are known in the literature as explosive events. In this pape…