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The Initial Mass Function and Disk Frequency of the ρ Ophiuchi Cloud: An Extinction-limited Sample
Meyer, Michael R.; Erickson, Kristen L.; Wilking, Bruce A. +2 more
We have completed an optical spectroscopic survey of an unbiased, extinction-limited sample of candidate young stars covering 1.3 deg2 of the ρ Ophiuchi star-forming region. While infrared, X-ray, and optical surveys of the cloud have identified many young stellar objects (YSOs), these surveys are biased toward particular stages of stel…
Spitzer Infrared Spectrometer 16 µm Observations of the Goods Fields
Papovich, Casey; Dickinson, Mark; Teplitz, Harry I. +13 more
We present Spitzer 16 µm imaging of the Great Observatories Origins Deep Survey (GOODS) fields. We survey 150 arcmin2 in each of the two GOODS fields (North and South), to an average 3σ depth of 40 and 65 µJy, respectively. We detect ~1300 sources in both fields combined. We validate the photometry using the 3-24 µm sp…
The Galactic Center in the Far-infrared
Smith, Howard A.; Stark, A. A.; González-Alfonso, E. +2 more
We analyze the far-infrared dust emission from the Galactic center region, including the circumnuclear disk (CND) and other structures, using Herschel PACS and SPIRE photometric observations. These Herschel data are complemented by unpublished observations by the Infrared Space Observatory Long Wavelength Spectrometer (ISO-LWS), which used paralle…
The Dust Properties of Two Hot R Coronae Borealis Stars and a Wolf-Rayet Central Star of a Planetary Nebula: In Search of a Possible Link
Sonneborn, G.; Gallagher, J. S.; Roman-Duval, J. +14 more
We present new Spitzer/IRS spectra of two hot R Coronae Borealis (RCB) stars, one in the Galaxy, V348 Sgr, and one lying in the Large Magellanic Cloud, HV 2671. These two objects may constitute a link between the RCB stars and the late Wolf-Rayet ([WCL]) class of central stars of planetary nebulae (CSPNe), such as CPD -56° 8032, that has little or…
IRAS 17423-1755 (Hen 3-1475) Revisited: An O-rich High-mass Post-asymptotic Giant Branch Star
García-Lario, P.; Manteiga, M.; Ulla, A. +2 more
The high-resolution (R ~ 600) Spitzer/IRS spectrum of the bipolar protoplanetary nebula (PN) IRAS 17423-1755 is presented in order to clarify the dominant chemistry (C-rich versus O-rich) of its circumstellar envelope as well as to constrain its evolutionary stage. The high-quality Spitzer/IRS spectrum shows weak 9.7 µm absorption from amorp…
Identification of a Complete 160 µm Flux-limited Sample of Infrared Galaxies in the ISO Lockman Hole 1 deg2 Deep Fields: Source Properties and Evidence for Strong Evolution in the FIR Luminosity Function for ULIRGs
Aussel, H.; Le Floc'h, E.; Veilleux, S. +13 more
We have identified a complete, flux-limited (S 160>120 mJy) sample of 160 µm selected sources from Spitzer observations of the 1 deg2 Infrared Space Observatory (ISO) Deep Field region in the Lockman Hole (LH). Ground-based UV, optical, and near-infrared (NIR) photometry and optical spectroscopy have been used to det…