Observations of a Compact (<1000 AU) MYSO Cluster with HST (2009)
Janet P. Simpson, Michael G. Burton, Angela S. Cotera, Edwin F. Erickson, Dean C. Hines, ...
Observations show that most, if not all, massive stars form in clusters. This combination of massive stars and clusters has led to the suggestions that massive stars form by coalescence after stellar...
Hubble Space Telescope NICMOS Polarization Observations of Three Edge-on Massive YSOs (2009)
Simpson, Janet P., Burton, Michael G., Colgan, Sean W. J., Cotera, Angela S., Erickson, Edwin F., Hines, Dean C., ...
Massive young stellar objects (YSOs), like low-mass YSOs, appear to be surrounded by optically thick envelopes and/or disks and have regions, often bipolar, that are seen in polarized scattered light...
Training of Instrumentalists and Development of New Technologies on SOFIA (2009)
Erickson, Edwin F., Allamandola, Louis J., Baluteau, Jean-Paul, Becklin, Eric E., Bjoraker, Gordon, Burton, Michael, ...
This white paper is submitted to the Astronomy and Astrophysics 2010 Decadal Survey (Astro2010)1 Committee on the State of the Profession to emphasize the potential of the Stratospheric Observatory...
Spitzer Observations of M33 and the Hot Star, H II Region Connection (2008)
Rubin, Robert H., Simpson, Janet P., Colgan, Sean W. J., Dufour, Reginald J., Brunner, Gregory, McNabb, Ian A., ...
We have observed emission lines of [S IV] 10.51, H(7-6) 12.37, [Ne II] 12.81, [Ne III] 15.56, and [S III] 18.71 um in a number of extragalactic H II regions with the Spitzer Space Telescope. A...
Angela S. Cotera, Edwin F. Erickson, David A. Allen, Janet P. Simpson, Michael G. Burton
Abstract. We have discovered hot stars within the central 40 parsecs of the Galactic center. They may at least partially ionize the thermal radio emission regions. A cluster of such stars in the...
Interstellar extinction in the vicinity of Galactic center thermal (2007)
Angela S. Cotera, Janet P. Simpson, Edwin F. Erickson, Michael G. Burton
radio emission regions
Spitzer IRS Observations of the Galactic Center: Shocked Gas in the Radio Arc Bubble (2007)
Simpson, Janet P., Colgan, Sean W. J., Cotera, Angela S., Erickson, Edwin F., Hollenbach, David J., Kaufman, Michael J., ...
We present Spitzer IRS spectra (R ~600, 10 - 38 micron) of 38 positions in the Galactic Center (GC), all at the same Galactic longitude and spanning plus/minus 0.3 degrees in latitude. Our positions...
Spitzer Observations of M83 and the Hot Star, H II Region Connection (2007)
Rubin, Robert H., Simpson, Janet P., Colgan, Sean W. J., Dufour, Reginald J., Ray, Katherine L., Erickson, Edwin F., ...
We have undertaken a program to observe emission lines of SIV 10.5, NeII 12.8, NeIII 15.6, & SIII 18.7 um in a number of extragalactic HII regions with the Spitzer Space Telescope. We report our...
Hubble Space Telescope NICMOS Polarization Measurements of OMC-1 (2006)
Simpson, Janet P., Colgan, Sean W. J., Erickson, Edwin F., Burton, Michael G., Schultz, A. S. B.
We present 2micron polarization measurements of positions in the BN region of the Orion Molecular Cloud (OMC-1) made with NICMOS Camera 2 (0.2'' resolution) on HST. Our results are as follows: BN is...
On the Measurement of Elemental Abundance Ratios in Inner Galaxy H II Regions (2004)
Simpson, Janet P., Rubin, Robert H., Colgan, Sean W. J., Erickson, Edwin F., Haas, Michael R.
Although variations in elemental abundance ratios in the Milky Way Galaxy certainly exist, details remain uncertain, particularly in the inner Galaxy, where stars and H II regions in the Galactic...
Saxena, Rajiv K., Saxena, Queen B., Weissman, David N., Simpson, Janet P., Bledsoe, Toni A., Lewis, Daniel M.
The effect of exposure to diesel exhaust particulate (DEP) on Bacillus Calmette-Guerin (BCG) lung infection in mice was studied. C57B1/6J female mice were infected with BCG (2.5x104 bacteria/mouse)...
Saxena, Rajiv K., Saxena, Queen B., Weissman, David N., Simpson, Janet P., Bledsoe, Toni A., Lewis, Daniel M.
The effect of exposure to diesel exhaust particulate (DEP) on bacillus Calmette-Guerin (BCG) lung infection in mice was studied. C57Bl/6J female mice were infected with BCG (2.5 × 104...
Saxena, Rajiv K., Saxena, Queen B., Weissman, David N., Simpson, Janet P., Bledsoe, Toni A., Lewis, Daniel M.
The effect of exposure to diesel exhaust particulate (DEP) on Bacillus Calmette-Guerin (BCG) lung infection in mice was studied. C57B1/6J female mice were infected with BCG (2.5x104 bacteria/mouse)...
HST NICMOS Observations of the Polarization of NGC 1068 (2002)
Simpson, Janet P., Colgan, Sean W. J., Erickson, Edwin F., Hines, Dean C., Schultz, A. S. B., Trammell, Susan R.
We have observed the polarized light at 2 micron in the center of NGC 1068 with HST NICMOS Camera 2. The nucleus is dominated by a bright, unresolved source, polarized at a level of 6.0 pm 1.2% with...