Search Publications
The plerion nebula in IC 443: The XMM-Newton view
Bocchino, F.; Bykov, A. M.
XMM-Newton observations of the X-ray feature 1SAX J0617.1+2221 in the IC 443 supernova remnant are reported. We resolve the structure of the nebula into a compact core with a hard spectrum of photon index gamma = 1.63+0.11-0.10 in the 2-10 keV energy range. The nebula also has an extended ({ ~ } 8hbox {^\prime}times 5arcmin )…
Physical Parameters of Erupting Luminous Blue Variables: NGC 2363-V1 Caught in the Act
Drissen, Laurent; Robert, Carmelle; Smith, Linda J. +3 more
A quantitative study of the luminous blue variable NGC 2363-V1 in the Magellanic galaxy NGC 2366 (D=3.44 Mpc) is presented, based on ultraviolet and optical Hubble Space Telescope STIS spectroscopy. Contemporary WFPC2 and William Herschel Telescope imaging reveals a modest V-band brightness increase of ~0.2 mag per year between 1996 January-1997 N…
Locating the Starburst in the SCUBA Galaxy SMM J14011+0252
Kneib, J. -P.; Ivison, R. J.; Frayer, D. T. +2 more
We present new, multiwavelength, high-resolution imaging of the luminous, submillimeter galaxy SMM J14011+0252, an interacting starburst at z=2.56. Our observations comprise optical imaging from the Hubble Space Telescope, sensitive radio mapping from the Very Large Array, and CO observations from the Owens Valley Radio Observatory and Berkeley-Il…
Absorption and Reddening in the Seyfert Galaxy NGC 3227
Kraemer, S. B.; Crenshaw, D. M.; Bruhweiler, F. C. +1 more
We have obtained low-dispersion spectra of NGC 3227 with the Space Telescope Imaging Spectrograph (STIS) to study the intrinsic UV absorption and the reddening of the nucleus in this Seyfert 1 galaxy. The UV spectra show a wealth of absorption lines at the systemic redshift that span a wide range in ionization state (Mg I to N V). The equivalent w…
Low-Degree Low-Order Solar p Modes As Seen By GOLF On board SOHO
Kosovichev, A. G.; Henney, C. J.; García, R. A. +8 more
Data recovered from the GOLF experiment on board the ESA/NASA SOHO spacecraft have been used to analyze the low-order low-degree solar velocity acoustic-mode spectrum below ν=1.5 mHz (i.e., 1≤n≤9,l≤2). Various techniques (periodogram, RLAvCS, homomorphic-deconvolution and RLSCSA) have been used and compared to avoid possible biases due to a given …
NICMOS imaging search for high-redshift damped Lyα galaxies
Jakobsen, P.; Fall, S. M.; Møller, P. +1 more
We are engaged in a programme of imaging with the STIS and NICMOS (NIC2) instruments aboard the Hubble Space Telescope (HST), to search for the galaxy counterparts of 18 high-redshift z>1.75 damped Lyα absorption lines and five Lyman-limit systems seen in the spectra of 16 target quasars. This paper presents the results of the imaging campaign …
Damped Lyα Absorption from a Nearby Low Surface Brightness Galaxy
Bowen, David V.; Tripp, Todd M.; Jenkins, Edward B.
Ground-based and Hubble Space Telescope (HST) images of the nearby galaxy SBS 1543+593 (z=0.009) show it to be a low surface brightness (LSB) galaxy with a central surface brightness µB(0)=23.2 mag arcsec-2 and scale length 0.9 h-1100 kpc, values typical for the local LSB galaxy population. The gal…
Variable Stars in the Unusual, Metal-Rich, Globular Cluster NGC 6441
Pritzl, Barton J.; Smith, Horace A.; Sweigart, Allen V. +1 more
We have undertaken a search for variable stars in the metal-rich globular cluster NGC 6441 using time-series BV photometry. The total number of variables found near NGC 6441 has been increased to ~104, with 48 new variables being found in this survey. A significant number of the variables are RR Lyrae stars (~46), most of which are probable cluste…
Circumstellar structure of RU Lupi down to au scales
Gledhill, T. M.; Hough, J. H.; Chrysostomou, A. +2 more
We have used the technique of spectro-astrometry to study the milliarcsecond scale structure of the emission lines in the T Tauri star RU Lupi. The wings of the Hα emission are found to be displaced from the star towards the south-west (blue wing) and north-east (red wing) with angular scales of 20-30mas. This structure is consistent with a bipola…
Structure and physical properties of the rapidly evolving dusty envelope of IRC +10 216 reconstructed by detailed two-dimensional radiative transfer modeling
Weigelt, G.; Men'shchikov, A. B.; Balega, Y. +2 more
We present the first detailed, two-dimensional radiative transfer model of the dusty envelope around the carbon star