The remnants of galaxy formation from a panoramic survey of the region around M31 (2009)
McConnachie, Alan W., Irwin, Michael J., Ibata, Rodrigo A., Dubinski, John, Widrow, Lawrence M., Martin, Nicolas F., ...
In hierarchical cosmological models, galaxies grow in mass through the continual accretion of smaller ones. The tidal disruption of these systems is expected to result in loosely bound stars...
Leo V: Spectroscopy of a Distant and Disturbed Satellite (2009)
Walker, Matthew G., Belokurov, Vasily, Evans, N. Wyn, Irwin, Michael J., Mateo, Mario, Olszewski, Edward W., ...
We present a spectroscopic study of Leo V, a recently discovered satellite of the Milky Way (MW). From stellar spectra obtained with the MMT/Hectochelle spectrograph we identify seven likely members...
IPHAS A-type Stars with Mid-IR Excesses in Spitzer Surveys (2009)
Hales, Antonio S., Barlow, Michael J., Drew, Janet E., Unruh, Yvonne C., Greimel, Robert, Irwin, Michael J., ...
We have identified 17 A-type stars in the Galactic Plane that have mid-IR excesses at 8 micron. From the observed colors in the (r'-H_alpha)-(r'-i') plane, we first identified 23050 early A-type main...
Commission 45: spectral classification (2008)
Giridhar, Sunetra, Gray, Richard O., Corbally, Christopher J., Eyer, Laurent, Irwin, Michael J., ...
This report gives an update of developments (since the last General Assembly at Prague) in the areas that are of relevance to the commission. In addition to numerous papers, a new monograph entitled...
The Local Group dwarf Leo T: H i on the brink of star formation (2008)
Ryan-Weber, Emma V., Begum, Ayesha, Oosterloo, Tom, Pal, Sabyasachi, Irwin, Michael J., Belokurov, Vasily, ...
We present Giant Meterwave Radio Telescope (GMRT) and Westerbork Synthesis Radio Telescope (WSRT) observations of the recently discovered Local Group dwarf galaxy, Leo T. The peak H i column density...
The Local Group dwarf Leo T: H i on the brink of star formation (2008)
Ryan-Weber, Emma V., Begum, Ayesha, Oosterloo, Tom, Pal, Sabyasachi, Irwin, Michael J., Belokurov, Vasily, ...
We present Giant Meterwave Radio Telescope (GMRT) and Westerbork Synthesis Radio Telescope (WSRT) observations of the recently discovered Local Group dwarf galaxy, Leo T. The peak H i column density...
The Local Group dwarf Leo T: HI on the brink of star formation (2007)
Ryan-Weber, Emma V., Begum, Ayesha, Oosterloo, Tom, Pal, Sabyasachi, Irwin, Michael J., Belokurov, Vasily, ...
We present Giant Meterwave Radio Telescope (GMRT) and Westerbork ynthesis Radio Telescope (WSRT) observations of the recently discovered Local Group dwarf galaxy, Leo T. The peak HI column density is...
The Canis Major Dwarf Galaxy (2004)
Lewis, Geraint F., Ibata, Rodrigo A., Irwin, Michael J., Martin, Nicolas F., Bellazzini, Michele, Conn, Blair
Recent observational evidence suggests that the Sagittarius dwarf galaxy represents the only major ongoing accretion event in the Galactic halo, accounting for the majority of stellar debris...
Serendipity and the SDSS: Discovery of the Largest Known Planetary Nebula on the Sky (2003)
Hewett, Paul C, Irwin, Michael J, Skillman, Evan D, Foltz, Craig B, Willis, Jon P, Warren, Stephen J, ...
Investigation of spectra from the Sloan Digital Sky Survey reveals the presence of a region of ionized gas of >2 degrees diameter centered approximately at alpha = 10^h 37^m delta = -00^o 18' (J2000)...
AAT/WFI observations of the Extragalactic H I Cloud HIPASS J1712-64 (2002)
Lewis, Geraint F., Irwin, Michael J., Ibata, Rodrigo A., Gibson, Brad K.
AAT/WFI optical images of a candidate extragalactic HI cloud, HIPASS J1712-64, are presented. The g and r-band CCD mosaic camera frames were processed using a new data pipeline recently installed at...
AAT/WFI observations of the extragalactic HI cloud HIPASS JI712-64 (2002)
Gibson, Bradley K., Ibata, Rodrigo A., Irwin, Michael J., Lewis, Geraint F.
AAT/WFI optical images of a candidate extragalactic HI cloud, HIPASS J1712–64, are presented. The g and r band CCD mosaic camera frames were processed using a new data pipeline recently installed...
AAT/WFI observations of the extragalactic HI cloud HIPASS JI712-64 (2002)
Gibson, Bradley K., Ibata, Rodrigo A., Irwin, Michael J., Lewis, Geraint F.
AAT/WFI optical images of a candidate extragalactic HI cloud, HIPASS J1712–64, are presented. The g and r band CCD mosaic camera frames were processed using a new data pipeline recently installed...
AAT/WFI observations of the extragalactic HI cloud HIPASS JI712-64 (2002)
Gibson, Bradley K., Ibata, Rodrigo A., Irwin, Michael J., Lewis, Geraint F.
AAT/WFI optical images of a candidate extragalactic HI cloud, HIPASS J1712–64, are presented. The g and r band CCD mosaic camera frames were processed using a new data pipeline recently installed...
AAT/WFI observations of the extragalactic HI cloud HIPASS JI712-64 (2002)
Gibson, Bradley K., Ibata, Rodrigo A., Irwin, Michael J., Lewis, Geraint F.
AAT/WFI optical images of a candidate extragalactic HI cloud, HIPASS J1712–64, are presented. The g and r band CCD mosaic camera frames were processed using a new data pipeline recently installed...
AAT/WFI observations of the extragalactic HI cloud HIPASS JI712-64 (2002)
Gibson, Bradley K., Ibata, Rodrigo A., Irwin, Michael J., Lewis, Geraint F.
AAT/WFI optical images of a candidate extragalactic HI cloud, HIPASS J1712–64, are presented. The g and r band CCD mosaic camera frames were processed using a new data pipeline recently installed...
Tolstoy, Eline, Irwin, Michael J., Cole, Andrew A., Pasquini, L., Gilmozzi, R., Gallagher, J. S.
Spectroscopic abundance determinations for stars spanning a Hubble time in age are necessary in order to unambiguously determine the evolutionary histories of galaxies. Using FORS1 in Multi-Object...
The Second APM UKST Colour Survey for z>4 Quasars (2000)
Storrie-Lombardi, Lisa J., Irwin, Michael J., McMahon, Richard G., Hook, Isobel M.
We present the spectra, positions, and finding charts for 31 bright (R4.5. The majority are in the southern sky (dec 2.5) colours from UK or POSSII Schmidt Plates scanned at the Automated Plate...
Ibata, Rodrigo A., Lewis, Geraint F., Irwin, Michael J., Lehar, Joseph, Totten, Edward J.
We present a suite of observations of the recently identified ultraluminous BAL quasar APM 08279+5255, taken both in the infra-red with the NICMOS high resolution camera on board the Hubble Space...
Submillimeter Observations of the Ultraluminous BAL Quasar APM 08279+5255 (1998)
Lewis, Geraint F., Chapman, Scott C., Ibata, Rodrigo A., Irwin, Michael J., Totten, Edward J.
With an inferred bolometric luminosity of $5\times10^{15}{\rm \lsun}$, the recently identified z=3.87, broad absorption line quasar APM 08279+5255 is apparently the most luminous object currently...
APM 08279+5255: an ultraluminous BAL quasar at a redshift z=3.87 (1998)
Irwin, Michael J., Ibata, Rodrigo A., Lewis, Geraint F., Totten, Edward J.
We report on the discovery of a highly luminous, broad absorption line quasar at a redshift of $z=3.87$ which is positionally coincident, within one arcsecond, with the IRAS FSC source F08279+5255. A...
Surfing the First and Second Waves in 2025: A SOF Strategy for Regional Engagement. (1998)
Berardinelli, Thomas F., Bignell, Sandra R., Irwin, Michael J., Rackauskas, Alfredo E.
Special Operations Regional Engagement (SORE) is the topic of this study. Its enduring qualities are timeless in comparison to technological advancements. To frame the function, assume the challenges...
Oligomeric and polymeric complexes of gold and platinum [microform]. (1998)
Irwin, Michael J. (Michael John)
Thesis (Ph. D.)--University of Western Ontario, 1997.
Perlmutter, Saul, Gabi, S., Goldhaber, G., Goobar, Ariel, Groom, Donald E., Hook, Isobel, ...
We have developed a technique to systematically discover and study high-redshift supernovae that can be used to measure the cosmological parameters. We report here results based on the initial seven...
Kim, Alex G., Gabi, S., Goldhaber, G., Groom, Donald E., Hook, Isobel, Kim, Min Kook, ...
The Supernova Cosmology Project has discovered over 28 supernovae (SNs) at 0.35 < z < 0.65 in an ongoing program that uses Type Ia SNs (SN Ia's) as high-redshift distance indicators. Here we...
Perlmutter, Saul, Gabi, S., Goldhaber, G., Goobar, Ariel, Groom, Donald E., Hook, Isobel, ...
We have developed a technique to systematically discover and study high-redshift supernovae that can be used to measure the cosmological parameters. We report here results based on the initial seven...
Kim, Alex G., Gabi, S., Goldhaber, G., Groom, Donald E., Hook, Isobel, Kim, Min Kook, ...
The Supernova Cosmology Project has discovered over 28 supernovae (SNs) at 0.35 < z < 0.65 in an ongoing program that uses Type Ia SNs (SN Ia's) as high-redshift distance indicators. Here we...
The type Ia supernova rate at z similar to 0.4 (1996)
Pain, Reynald, Hook, Isobel, Deustua, Susana E., Gabi, S., Goldhaber, G., Groom, Donald E., ...
We present the first measurement of the rate of Type la supernovae at high redshift. The result is derived by using a large subset of data from the Supernova Cosmology Project. Three supernovae were...
The type Ia supernova rate at z similar to 0.4 (1996)
Pain, Reynald, Hook, Isobel, Deustua, Susana E., Gabi, S., Goldhaber, G., Groom, Donald E., ...
We present the first measurement of the rate of Type la supernovae at high redshift. The result is derived by using a large subset of data from the Supernova Cosmology Project. Three supernovae were...
Birder, John D., Irwin, Michael J.
Thesis (M.S.)--University of Wisconsin--Stout, 1980.