Journal Article

Simulation of a strategy for the pixel lensing of M87 using the <i>Hubble Space Telescope</i>

Sedighe Sajadian and Sohrab Rahvar

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 419, issue 1, pages 124-131
Published in print January 2012 | ISSN: 0035-8711
Published online December 2011 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.19671.x
Simulation of a strategy for the pixel lensing of M87 using the Hubble Space Telescope

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In this paper, we propose a new strategy for the pixel-lensing observations of M87 in the Virgo cluster using the Hubble Space Telescope (HST). In contrast to a previous observational strategy by Baltz et al., we show that a few days of intensive observations with the duration of ∼90 min in each HST orbit will increase the observational efficiency of high-magnification events by more than one order of magnitude. We perform a Monte Carlo simulation for this strategy and we show that the number of high-magnification microlensing events will increase at the rate of 4.2 events per day with a typical transit time-scale of 16 h. We also examine the possibility of observing mini-halo dark matter structures using pixel lensing.

Keywords: gravitational lensing: micro; galaxies: individual: M87; dark matter

Journal Article.  6057 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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