590 citations · 8.8k across the 153 of their papers we have counts for
11 papers · 1 filter
Imaging the Lyman-alpha Forest
Andrew Gould, David H. Weinberg
We show that it is now possible to image optically thick $\lya$ clouds in fluorescent $\lya$ emission with a relatively long (hr) integration on a large (m) tel…
Theory of Pixel Lensing
Andrew Gould
Pixel lensing, gravitational microlensing of unresolved stars, is potentially much more sensitive and much more widely applicable than is generally recognized. I give explicit expr…
Limits on the Gravity Wave Background From Microlensed Quasars
Andrew Gould
The paper previously submitted under this title is incorrect in that it drastically overestimates the cumulative deflection due to a gravitational wave (GW) background. Avi Loeb gi…
Monte Carlo Simulations of Macho Parallaxes From a Satellite
Thomas Boutreux, Andrew Gould
Three ongoing microlensing experiments have found more candidate events than expected from the known stars. These experiments measure only one parameter of the massive compact halo…
Macho Proper Motions From Optical/Infrared Photometry
Andrew Gould, Douglas L. Welch
Optical/infrared photometry can double the number of proper motion measurements of Massive Compact Objects (MACHOs) relative to single band photometry. The proper motion of a MACHO…
Lunar Occultation of MACHOs
Cheongho Han, Vijay K. Narayanan, Andrew Gould
Lunar occultation can be used to measure the proper motions of some of the long time scale microlensing events, $t_{e} \gsim 70$ days, now being detected toward the Galactic bulge.…
Disk M Dwarf Luminosity Function From HST Star Counts
Andrew Gould, John N. Bahcall, Chris Flynn
We study a sample of 257 Galactic disk M dwarfs (8<M_V<18.5) found in images obtained using HST. These include 192 stars in 22 fields imaged with the repaired WFC2 with mean limiti…
Probing For Machos of Mass - with Gamma-Ray Burst Parallax Spacecraft
Robert J. Nemiroff, Andrew Gould
Two spacecraft separated by $\sim 1\,\au$ and equipped with gamma-ray burst (GRB) detectors could detect or rule out a cosmological density of Massive Compact Halo Objects (MACHOs)…
Microlensing Search of Quasars
Andrew Gould
By monitoring quasars one could search for lensing by stars and Massive Compact Halo Objects (Machos) out to redshifts . If Machos have a present cosmological densi…
Statistical Determination of the MACHO Mass Spectrum
Cheongho Han, Andrew Gould
The mass function of 51 Massive Compact Objects (MACHOs) detected toward the Galactic bulge is statistically estimated from Einstein ring crossing times . For a Gaussian…
Search for Intra-Cluster Machos by Pixel Lensing of M87
Andrew Gould
Intra-Cluster Machos (ICMs) are a plausible candidate for at least some of the dark matter in clusters of galaxies. ICMs can be detected by searching toward M87 for ``pixel lensing…