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9 papers · 1 filter
Optical and near-infrared properties of submillimetre galaxies in the GOODS-North field
Alexandra Pope, Douglas Scott, Colin Borys +3
We investigate the photometric redshift distribution, colours and morphologies of a large sample of submillimetre sources in the GOODS-North region. With the depth achieved by the…
Polarization and energy content of parsec scale AGN jets
Maxim Lyutikov, Vladimir I. Pariev, Denise C. Gabuzda
Most of energy carried by relativistic AGN jets remains undetected until hundreds of kiloparsecs where interaction with intergalactic medium produces hot spots. The jet's hidden en…
GBT Observations of Very Low Mass Binary Millisecond Pulsars: A Search for Eclipses
David J. Nice, Ingrid H. Stairs, Zaven Arzoumanian
We searched for eclipses of two millisecond pulsars, PSR J1807-2459 and PSR B1908+00. These pulsars are in very low mass binary systems with orbital parameters similar to those of…
Arecibo Measurements of Pulsar--White Dwarf Binaries: Evidence for Heavy Neutron Stars
David J. Nice, Eric M. Splaver, Ingrid H. Stairs
We summarize constraints on neutron star masses from ongoing timing observations of pulsar-white dwarf binaries at Arecibo. The trend is toward pulsar masses larger than the canoni…
The Dearth of Massive, Helium-Rich White Dwarfs in Young Open Star Clusters
Jasonjot Singh Kalirai, Harvey B. Richer, Brad M. S. Hansen +2
Spectra have been obtained of 21 white dwarfs (WDs) in the direction of the young, rich open star cluster NGC 2099. This represents an appreciable fraction (>30%) of the cluster's…
The Initial-Final Mass Relationship: Spectroscopy of White Dwarfs in NGC 2099 (M37)
Jasonjot Singh Kalirai, Harvey B. Richer, David Reitzel +5
We present new observations of very faint white dwarfs (WDs) in the rich open star cluster NGC 2099 (M37). Following deep, wide field imaging of the cluster using CFHT, we have now…