Search Publications
Photometric Identification of Type Ia Supernovae at Moderate Redshift
Johnson, Benjamin D.; Crotts, Arlin P. S.
Large photometric surveys with the aim of identifying many Type Ia supernovae (SNe) at moderate redshift are challenged in separating these SNe from other SN types. We are motivated to identify Type Ia SNe based only on broadband photometric information, since spectroscopic determination of the SN type, the traditional method, requires significant…
NICMOS2 Hubble Space Telescope Observations of the Embedded Cluster Associated with Mon R2: Constraining the Substellar Initial Mass Function
Dougados, C.; Andersen, M.; Meyer, M. R. +2 more
We have analyzed Hubble Space Telescope NICMOS2 F110W-, F160W-, F165M-, and F207M-band images covering the central 1'×1' region of the cluster associated with Mon R2 in order to constrain the initial mass function (IMF) down to 20MJ. The flux ratio between the F165M and F160W bands was used to measure the strength …
Far-Ultraviolet Imaging of the Hubble Deep Field-North: Star Formation in Normal Galaxies at z<1
Gardner, Jonathan P.; Dickinson, M.; Chary, R. +8 more
We present far-ultraviolet (FUV) imaging of the Hubble Deep Field-North (HDF-N) taken with the Solar Blind Channel of the Advanced Camera for Surveys (ACS SBC) and the FUV MAMA detector of the Space Telescope Imaging Spectrograph onboard the Hubble Space Telescope. The full WFPC2 deep field has been observed at 1600 Å. We detect 134 galaxies and o…
Deep Imaging Surveys of Star-forming Clouds. IV. The Meek and the Mighty: Outflows from Young Stars in Chamaeleon I
Bally, John; Fazio, Giovanni; Walawender, Josh +1 more
We present a survey of shocks and outflows in the Chamaeleon I star-forming complex using Hα, [S II], and SDSS i' images obtained from the ground, an i' image obtained with the Hubble Space Telescope, and 4.5 µm images obtained with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. We find new Herbig-Haro (HH) objects and exte…
Hubble Space Telescope Imaging of the Outburst Site of M31 RV
Bond, Howard E.; Siegel, Michael H.
M31 RV is a luminous red variable star that appeared for several months in the bulge of M31 during 1988. Unlike classical novae, M31 RV was cool throughout its outburst. Interest in this object has been revived recently because of its strong resemblance to V838 Mon, a luminous Galactic variable star that appeared in 2002 and is illuminating a spec…
Cloud Fragmentation and Proplyd-like Features in H II Regions Imaged by the Hubble Space Telescope
O'Dell, C. R.; De Marco, Orsola; Rubin, R. H. +2 more
We have analyzed Hubble Space Telescope ACS and WFPC2 new and archival images of eight H II regions to look for new protoplanetary disks (proplyds) similar to those found in the Orion Nebula. We find a wealth of features similar in size (although many are larger) to the bright cusps around the Orion Nebula proplyds. None of them, however, contains…
Spectral Irradiance Calibration in the Infrared. XVI. Improved Accuracy in the Infrared Spectra of the Secondary and Tertiary Standard Calibration Stars
Kraemer, Kathleen E.; Price, Stephan D.; Engelke, Charles W.
We have increased the spectral resolution and accuracy of the absolute infrared spectral flux for a subset of stellar standards created by Cohen and his collaborators in previous papers in this series. We combined the moderate-resolution (λ/Δλ~400) spectroscopy obtained on infrared standard stars by the Short Wavelength Spectrometer on the Infrare…
Double Nucleus in M83
Díaz, Rubén J.; Mast, Damián; Agüero, M. Paz
M83 is one of the nearest galaxies with enhanced nuclear star formation, and it presents one of the best opportunities to study the kinematics and physical properties of a circumnuclear starburst. Our three-dimensional spectroscopy data in the R band confirm the presence of a secondary nucleus or mass concentration (previously suggested by Thatte …
The Properties and Redshift Evolution of Intermediate-Luminosity Off-Nuclear X-Ray Sources in the Chandra Deep Fields
Lehmer, B. D.; Hornschemeier, A. E.; Alexander, D. M. +5 more
We analyze a population of intermediate-redshift (z~0.05-0.3) off-nuclear X-ray sources located within optically bright galaxies in the Great Observatories Origins Deep Survey and Galaxy Evolution from Morphology and SEDs fields. A total of 24 off-nuclear source candidates are classified using deep Chandra X-Ray Observatory exposures from the Chan…
Spitzer Observations of the Prototypical Extremely Red Objects HR 10 and LBDS 53W091: Separating Dusty Starbursts from Old Elliptical Galaxies
Eisenhardt, Peter R. M.; Chary, Ranga-Ram; Stern, Daniel +1 more
We present Spitzer Space Telescope observations of the well-studied extremely red objects (EROs) HR 10 and LBDS 53W091 from 3.6 to 160 µm. These galaxies are the prototypes of the two primary classes of EROs: dusty starbursts and old, evolved galaxies, respectively. Both galaxies, as well as LBDS 53W069, another example of an old, quiescent …