ar X iv : a st ro - p h / 01 05 21 4 v 2 2 7 Ju n 20 01 Upper limits on O VI Emission From Voyager Observations

ar X iv : a st ro - p h / 01 05 21 4 v 1 1 4 M ay 2 00 1 Upper limits on O VI Emission From Voyager Observations

We have examined 426 Voyager fields distributed across the sky for O VI (λλ 1032/1038Å) emission from the Galactic diffuse interstellar medium. No such emission was detected in any of our observed fields. Our most constraining limit was a 90% confidence upper limit of 2600 photons cm −2 sr −1 s −1 on the doublet emission in the direction (l, b) = (117. • 3, 50. • 6). Combining this with an abso...

ar X iv : a st ro - p h / 01 09 47 3 v 1 2 6 Se p 20 01 1 FAR - INFRARED ISO LIMITS ON DUST DISKS AROUND MILLISECOND PULSARS

We report 60 and 90 µm observations of 7 millisecond pulsars with the ISOPHOT instrument and describe our analysis procedures. No pulsars were detected, and typical (3σ) upper limits are 150 mJy. We combine our results with others in the literature and use them to place constraints on the existence of protoplanetary or dust disks around millisecond pulsars.

ar X iv : a st ro - p h / 01 06 27 9 v 1 1 5 Ju n 20 01 FUSE Observations of Cooling Flow Gas in the Galaxy Clusters A 1795 and A 2597

We present far-ultraviolet spectroscopy of the cores of the massive cooling flow clusters Abell 1795 and 2597 obtained with FUSE. As the intracluster gas cools through 3×10 5 K, it should emit strongly in the O vi λλ1032,1038 resonance lines. We report the detection of O vi λ1032 emission in A2597, with a line flux of 1.35 ± 0.35 × 10 −15 erg cm −2 s −1 , as well as detection of emission from C...

ar X iv : a st ro - p h / 01 06 34 0 v 1 1 9 Ju n 20 01 1 UPPER LIMITS OF THE 22 NA YIELD FROM O - NE NOVA

The radioactive isotope 22 Na is one of the primary tracer isotopes that may potentially be detectable by gamma-ray spectroscopy. This isotope is predicted to be produced in ONe nova explosions, yet no detection of its 1.275 MeV gamma-ray signature has been reported so far. In particular, 6 years of COMPTEL observations of the galactic bulge, a region that should be particularly rich in nova ex...

ar X iv : a st ro - p h / 04 06 56 7 v 1 2 4 Ju n 20 04 1