Pulsars, transients and relativistic astrophysics

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The GlobalJetWatch spectrographs: a fibre-fed spectrograph for small telescopes - art. no. 70145A

GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY II, PTS 1-4 7014 (2008) A145-A145

Authors:

Fraser J Clarke, Andrew J Gosling, Sam Doolin, Paul Goodall, Sebastian Perez, Paul Pattinson, Rick Makin, Katherine M Blundell
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The Nuclear Bulge extinction

AIP CONF PROC 1010 (2008) 168-170

Authors:

J Andrew, KM Blundell, RM Bandyopadhyay, P Lucas

Abstract:

We present a new, high resolution (5 '' per pixel) near-infrared extinction map of the Nuclear Bulge using data from the UKIDSS-GPS. Using photometry from the J, H and K-bands we show that the extinction law parameter a is also highly variable in this region on similar scales to the absolute extinction. We show that only when this extinction law variation is taken into account can the extinction be measured consistently at different wavelengths.
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The VLT-FLAMES Survey of Massive Stars: Instrumental Stability and Detection of Massive Binaries

ESO Astrophysics Symposia Springer Nature (2008) 49-51

Authors:

CJ Evans, DJ Lennon, I Hunter, T Augusteijn, SJ Smartt
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The effects of Prandtl number on black hole accretion flows

NEW ASTRONOMY REVIEWS 51:10-12 (2008) 814-818

Authors:

Steven A Balbus, Pierre Lesaffre
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Characteristics of EGRET blazars in the VLBA Imaging and Polarimetry Survey (VIPS)

Astrophysical Journal 671:2 (2007) 1355-1364

Authors:

GB Taylor, SE Healey, JF Helmboldt, S Tremblay, CD Fassnacht, RC Walker, LO Sjouwerman, TJ Pearson, ACS Readhead, L Weintraub, N Gehrels, RW Romani, PF Michelson, RD Blandford, G Cotter

Abstract:

We examine the radio properties of EGRET-detected blazars observed as part of the VLBA Imaging and Polarimetry Survey (VIPS). VIPS has a flux limit roughly an order of magnitude below the MOJAVE survey and most other samples that have been used to study the properties of EGRET blazars. At lower flux levels, radio flux density does not directly correlate with gamma-ray flux density. We do find that the EGRET-detected blazars tend to have higher brightness temperatures, greater core fractions, and possibly larger than average jet opening angles. A weak correlation is also found with jet length and with polarization. All of the well-established trends can be explained by systematically larger Doppler factors in the gamma-ray-loud blazars, consistent with the measurements of higher apparent velocities found in monitoring programs carried out at radio frequencies above 10 GHz. © 2007. The American Astronomical Society. All rights reserved.
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