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VOFilter, Bridging Virtual Observatory and Industrial Office Applications
Chen-zhou Cui, Markus Dolensky, Peter Quinn +2
VOFilter is an XML based filter developed by the Chinese Virtual Observatory project to transform tabular data files from VOTable format into OpenDocument format. VOTable is an XML…
The MACHO Project Large Magellanic Cloud variable star inventory. XI. Frequency analysis of the fundamental mode RR Lyrae stars
C. Alcock, D. R. Alves, A. Becker +20
We have frequency analyzed 6391 variables classified earlier as fundamental mode RR Lyrae (RR0) stars in the MACHO database on the Large Magellanic Cloud (LMC). The overwhelming ma…
Recent Microlensing Results from the MACHO Project
P. Popowski, C. A. Nelson, D. P. Bennett +19
We describe a few recent microlensing results from the MACHO Collaboration. The aim of the MACHO Project was the identification and quantitative description of dark and luminous ma…
MACHO Project Analysis of the Galactic Bulge Microlensing Events with Clump Giants as Sources
P. Popowski, T. Vandehei, K. Griest +19
We present preliminary results of the analysis of 5 years of MACHO data on the Galactic bulge microlensing events with clump giants as sources. This class of events allows one to o…
VLT Deep I-band Surface Brightness Fluctuations of IC 4296
S. Mei, D. R. Silva, P. J. Quinn
From theoretical predictions, the introduction of 8-m class telescopes permits one to extend Surface Brightness Fluctuations measurements from the ground to ~7000 km/s, with a prec…
Anomalous Surface Brightness Fluctuations in NGC 4489
S. Mei, D. R. Silva, P. J. Quinn
Anomalously high K-band surface brightness fluctuations (SBF) have been reported in NGC 4489 by Pahre & Mould (1994), Jensen et al. (1996) and Jensen et al. (1998). However, these…
A 421 d Activity Cycle in the BeX Recurrent Transient A0538-66 from MACHO monitoring
C. Alcock, R. A. Allsman, D. R. Alves +23
We present a ~ 5-yr optical light curve of the recurrent Be/X-ray transient A0538-66 obtained as a by-product of the MACHO Project. These data reveal both a long-term modulation at…
The MACHO Project Hubble Space Telescope Follow-Up: Preliminary Results on the Location of the Large Magellanic Cloud Microlensing Source Stars
C. Alcock, R. A. Allsman, D. R. Alves +21
We attempt to determine whether the MACHO microlensing source stars are drawn from the average population of the LMC or from a population behind the LMC by examining the HST color-…
Galactic Bulge Microlensing Events with Clump Giants as Sources
P. Popowski, C. Alcock, R. A. Allsman +21
We present preliminary results of the analysis of 5 years of MACHO data on the Galactic bulge microlensing events with clump giants as sources. In particular, we discuss: 1) the se…
Searching for periodicities in the MACHO light curve of LMC X-2
C. Alcock, R. A. Allsman, D. R. Alves +23
Using the exceptional long-term monitoring capabilities of the MACHO project, we present here the optical history of LMC X-2 for a continuous 6-yr period. These data were used to i…
The MACHO Project: Microlensing Results from 5.7 Years of LMC Observations
The MACHO collaboration, C. Alcock, R. A. Allsman +23
We report on our search for microlensing towards the Large Magellanic Cloud (LMC). Analysis of 5.7 years of photometry on 11.9 million stars in the LMC reveals 13 - 17 microlensing…
Difference Image Analysis of Galactic Microlensing I. Data Analysis
C. Alcock, R. A. Allsman, D. Alves +18
This is a preliminary report on the application of Difference Image Analysis (DIA) to galactic bulge images. The aim of this analysis is to increase the sensitivity to the detectio…
The MACHO Project LMC Variable Star Inventory. VI. The Second-overtone Mode of Cepheid Pulsation From First/Second Overtone (FO/SO) Beat Cepheids
The MACHO Collaboration, C. Alcock, R. A. Allsman +19
MACHO Project photometry of 45 LMC FO/SO beat Cepheids which pulsate in the first and second overtone (FO and SOo, respectively) has been analysed to determine the lightcurve chara…
The Blazhko Effect in RR Lyrae stars: Strong observational support for the oblique pulsator model in three stars
The MACHO Collaboration, C. Alcock, D. R. Alves +17
Using the novel data set of the MACHO project, we show that three ``Blazhko Effect'' RR Lyrae stars show nearly-pure amplitude modulation of a single pulsation mode. This is strong…
Pulsating Variable Stars in the MACHO Bulge database: The Semiregular Variables
D. Minniti, C. Alcock, R. A. Allsman +17
We review the pulsating stars contained in the top 24 fields of the MACHO bulge database, with special emphasis on the red semiregular stars. Based on period, amplitude and color c…
The MACHO Project SMC Variable Star Inventory: I. The Second-overtone Mode of Cepheid Pulsation From First/Second Overtone (1H/2H) Beat Cepheids
The MACHO Collaboration, C. Alcock, R. A. Allsman +16
We report the discovery of 20 1H/2H and 7 F/1H beat Cepheids in the SMC by the MACHO Project. We utilize the 20 1H/2H stars to determine lightcurve shape for the SMC second-overton…
The MACHO Project LMC Variable Star Inventory: The Discovery of RV Tauri stars and New Type II Cepheids in the LMC
The MACHO Collaboration, C. Alcock, R. A. Allsman +19
We report the discovery of RV Tauri stars in the Large Magellanic Cloud. In light and colour curve behaviour, the RV Tauri stars appear to be a direct extension of the type II Ceph…
The MACHO Project: Microlensing and Variable Stars
The MACHO Collaboration, K. H. Cook, C. Alcock +18
The MACHO Project monitors millions of stars in the Large Magellanic Cloud, the Small Magellanic Cloud and the bulge of the Milky Way searching for the gravitational microlensing s…
Merging History Trees of Dark Matter Haloes: a Tool for Exploring Galaxy Formation Models
Boudewijn F. Roukema, Bruce A. Peterson, Peter J. Quinn +1
A method of deriving and using merging history trees of dark matter galaxy haloes directly from pure gravity N-body simulations is presented. This combines the full non-linearity o…
Where do the disks of spiral galaxies end?
J. Bland-Hawthorn, K. C. Freeman, P. J. Quinn
In spiral galaxies, the HI surface density declines with increasing radius to a point where it is seen to truncate dramatically in the best observed cases. It was anticipated that…
NGC 5084: A Massive Disk Galaxy Accreting its Satellites ?
Claude Carignan, Stephanie Cote, Ken Freeman +1
The spectra of 34 galaxies within 20 arcmins (\sim 100 kpc) of the lenticular galaxy NGC 5084 have been obtained using the FOCAP system on the Anglo-Australian 3.9m telescope. Nine…
Discovery of Numerous Dwarf Galaxies in the Two Nearest Groups of Galaxies
Stephanie Cote, Ken Freeman, Claude Carignan +1
We report the discovery of a large population of dwarf irregular galaxies in the two nearest groups of galaxies outside the Local Group, the Sculptor and the Centaurus A groups (2.…
The X-ray off-state of the supersoft source CAL 83 and its interpretation
C. Alcock et al
We consider simultaneous optical data obtained during the recent X-ray turn-off of CAL83. Combining the optical behaviour with the observed X-ray decay time, we show that a model o…
Gravitational Microlensing Results from MACHO
The MACHO Collaboration, W. Sutherland, C. Alcock +17
The MACHO project is searching for dark matter in the form of massive compact halo objects (Machos), by monitoring the brightness of millions of stars in the Magellanic Clouds to s…