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63 papers · 1 filter
New CO detections of lensed submillimeter galaxies in A2218: Probing molecular gas in the LIRG regime at high redshift
K. K. Knudsen, R. Neri, J. -P. Kneib +1
Context: Submillimeter galaxies (SMGs) are distant, dusty galaxies undergoing star formation at prodigious rates. Recently there has been major progress in understanding the nature…
Infrared Emission by Dust Around lambda Bootis Stars: Debris Disks or Thermally Emitting Nebulae?
J. R. Martínez-Galarza, I. Kamp, K. Y. L. Su +3
We present a model that describes stellar infrared excesses due to heating of the interstellar (IS) dust by a hot star passing through a diffuse IS cloud. This model is applied to…
A photometric study of the southern Blazhko star SS For Unambiguous detection of quintuplet components
Katrien Kolenberg, Elisabeth Guggenberger, Thebe Medupe +6
We present our analysis of photometric data in the Johnson B and V filter of the southern Blazhko star SS For. In parallel, we analyzed the V observations obtained with the ASAS-3…
Photodesorption of Ices II: H2O and D2O
Karin I. Oberg, Harold Linnartz, Ruud Visser +1
Gaseous H2O has been detected in several cold astrophysical environments, where the observed abundances cannot be explained by thermal desorption of H2O ice or by H2O gas phase for…
Powerful H Emission and Star Formation on the Interacting Galaxy System Arp 143: Observations with Spitzer and GALEX
P. Beirão, P. N. Appleton, B. R. Brandl +3
We present new mid-infrared (m) and ultraviolet (1539 -- 2316 Å) observations of the interacting galaxy system Arp 143 (NGC 2444/2445) from the Spitzer Space Telescope and…
A New Secular Instability of Eccentric Stellar Disks Around Supermassive Black Holes, with Application to the Galactic Center
Ann-Marie Madigan, Yuri Levin, Clovis Hopman
We identify a new secular instability of eccentric stellar disks around supermassive black holes. We show that retrograde precession of the stellar orbits, due to the presence of a…