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Interstellar Extinction and Long-Period Variables in the Galactic Center
M. Schultheis, K. Sellgren, S. Ramirez +4
We use the Spitzer IRAC catalogue of the Galactic Center (GC) point sources (Ramirez et al. 2008) and combine it with new isochrones (Marigo et al. 2008) to derive extinctions base…
A Catalog of X-ray Point Sources from Two Megaseconds of Chandra Observations of the Galactic Center
M. P. Muno, F. E. Bauer, F. K. Baganoff +23
We present a catalog of 9017 X-ray sources identified in Chandra observations of a 2 by 0.8 degree field around the Galactic center. We increase the number of known X-ray sources i…
Comparison of 3.6 - 8.0 Micron Spitzer/IRAC Galactic Center Survey Point Sources with Chandra X-Ray Point Sources in the Central 40x40 Parsecs
R. G. Arendt, D. Y. Gezari, S. R. Stolovy +8
We have studied the correlation between 2357 Chandra X-ray point sources in a 40 x 40 parsec field and ~20,000 infrared sources we observed in the corresponding subset of our 2 x 1…
The Mid-Infrared Colors of the ISM and Extended Sources at the Galactic Center
R. G. Arendt, S. R. Stolovy, S. V. Ramírez +6
A mid-infrared (3.6-8 um) survey of the Galactic Center has been carried out with the IRAC instrument on the Spitzer Space Telescope. This survey covers the central 2x1.4 degree (~…
Point Sources from a Spitzer IRAC Survey of the Galactic Center
Solange V. Ramirez, Richard G. Arendt, Kris Sellgren +4
We have obtained Spitzer/IRAC observations of the central 2.0 x 1.4 degrees (~280 x 200 pc) of the Galaxy at 3.6-8.0 microns. A point source catalog of 1,065,565 objects is present…
Masers as Probes of Massive Star Formation in the Nuclear Disk
F. Yusef-Zadeh, R. G. Arendt, C. O. Heinke +9
OH(1720 MHz) and methanol masers are now recognized to be excellent probes of the interactions of supernova remnants with molecular clouds and tracers of massive star formation, re…
Absolute Calibration and Characterization of the Multiband Imaging Photometer for Spitzer. I. The Stellar Calibrator Sample and the 24 micron Calibration
C. W. Engelbracht, M. Blaylock, K. Y. L. Su +23
We present the stellar calibrator sample and the conversion from instrumental to physical units for the 24 micron channel of the Multiband Imaging Photometer for Spitzer (MIPS). Th…
The Frequency of Mid-Infrared Excess Sources in Galactic Surveys
B. Uzpen, H. A. Kobulnicky, A. J. Monson +27
We have identified 230 Tycho-2 Spectral Catalog stars that exhibit 8 micron mid-infrared extraphotospheric excesses in the MidCourse Space Experiment (MSX) and Spitzer Space Telesc…
Tentative Discovery of a New Supernova Remnant in Cepheus: Unveiling an Elusive Shell in the Spitzer Galactic First Look Survey
Patrick W. Morris, Susan Stolovy, Stefanie Wachter +3
We have discovered an axially symmetric, well-defined shell of material in the constellation of Cepheus, based on imaging acquired as part of the Galactic First Look Survey with th…
Identification of Main Sequence Stars with Mid-Infrared Excesses Using GLIMPSE: Beta-Pictoris Analogs?
B. Uzpen, H. A. Kobulnicky, K. A. G. Olsen +23
Spitzer IRAC 3.6-8 micron photometry obtained as part of the GLIMPSE survey has revealed mid-infrared excesses for 33 field stars with known spectral types in a 1.2 sq. degree fiel…
HCN and HCO+ Observations of the Galactic Circumnuclear Disk
M. H. Christopher, N. Z. Scoville, S. R. Stolovy +1
We present high spatial resolution (5.1" x 2.7") OVRO millimeter array observations of HCN (J=1-0) and HCO+ (J=1-0) emission in the inner 3 pc of the galaxy. The HCN and HCO+ emiss…
Processing of 24 Micron Image Data at the Spitzer Science Center
Frank J. Masci, Russ Laher, Fan Fang +5
The 24 micron array on board the Spitzer Space Telescope is one of three arrays in the Multi-band Imaging Photometer for Spitzer (MIPS) instrument. It provides 5.3 x 5.3 arcmin ima…
Discovery of a New Low-Latitude Milky Way Globular Cluster using GLIMPSE
Chip Kobulnicky, A. J. Monson, B. A Buckalew +28
Spitzer Space Telescope imaging as part of the Galactic Legacy Mid-Plane Survey Extraordinaire (GLIMPSE) reveals a previously unidentified low-latitude rich star cluster near l=31.…
The Anatomy of Star Formation in NGC 300
G. Helou, H. Roussel, P. Appleton +19
The Spitzer Space Telescope was used to study the mid-infrared to far-infrared properties of NGC 300, and to compare dust emission to Halpha to elucidate the heating of the ISM and…
IRAC Observations of M81
S. P. Willner, M. L. N. Ashby, P. Barmby +15
IRAC images of M81 show three distinct morphological constituents: a smooth distribution of evolved stars with bulge, disk, and spiral arm components; a clumpy distribution of dust…
Structure and Colors of Diffuse Emission in the Spitzer Galactic First Look Survey
James G. Ingalls, M. -A. Miville-Deschênes, William T. Reach +16
We investigate the density structure of the interstellar medium using new high-resolution maps of the 8 micron, 24 micron, and 70 micron surface brightness towards a molecular clou…
A GLIMPSE of Star Formation in the Giant H II Region RCW 49
B. A. Whitney, R. Indebetouw, B. L. Babler +19
GLIMPSE imaging using the Infrared Array Camera (IRAC) on the Spitzer Space Telescope indicates that star formation is ongoing in the RCW 49 giant H II region. A photometric compar…
Spatially Resolved Ultraviolet, H-alpha, Infrared, and Radio Star Formation in M81
K. D. Gordon, P. G. Perez-Gonzalez, K. A. Misselt +26
We present Multiband Imaging Photometer for Spitzer (MIPS) observations of M81 at 24, 70, and 160 micron. The grand design nature of M81 is clearly seen, showing two well resolved…
The Wavelength Dependence of Interstellar Extinction from 1.25 to 8.0 microns Using GLIMPSE Data
R. Indebetouw, J. S. Mathis, B. L. Babler +17
We determine and tabulate A(lambda)/A(K), the wavelength dependence of interstellar extinction, in the Galactic plane for 1.25um<lambda<8.0um along two lines of sight: l~42 and l~2…
The nature of the Galactic Center source IRS 13 revealed by high spatial resolution in the infrared
J. P. Maillard, T. Paumard, S. R. Stolovy +1
High spatial resolution observations in the 1 to 3.5 micron region of the Galactic Center source known historically as IRS 13 are presented. They include ground-based adaptive opti…
GLIMPSE: I. A SIRTF Legacy Project to Map the Inner Galaxy
Robert A. Benjamin, E. Churchwell, Brian L. Babler +17
GLIMPSE (Galactic Legacy Infrared Mid-Plane Survey Extraordinaire), a SIRTF Legacy Science Program, will be a fully sampled, confusion-limited infrared survey of the inner two-thir…
HST Paschen alpha and 1.9 micron imaging of Sgr A West
N. Z. Scoville, S. R. Stolovy, M. Rieke +2
We present HST/NICMOS images at 0.2" resolution of the HI Paschen Alpha (PaA) emission line in a 70" x 90" region of the Galactic center centered on the non-thermal radio source Sg…
High Mass, OB Star Formation in M51 : HST Halpha and Palpha Imaging
N. Z. Scoville, M. Polletta, S. Ewald +3
(first paragraph) We have obtained Halpha and Palpha emission line images covering the central 3 - 4 arcmin of M51 using the WFPC2 and NICMOS cameras on HST to study the high-mass…
High Spectral and Spatial Resolution Observations of Shocked Molecular Hydrogen at the Galactic Center
F. Yusef-Zadeh, S. R. Stolovy, M. Burton +2
The presence of OH (1720 MHz) masers, and the absence of counterparts at 1665/1667 MHz has proved to be a clear diagnostic of shocked molecular gas associated with Galactic superno…