Search Publications
Globular Cluster Systems of Spiral and S0 Galaxies: Results from WIYN Imaging of NGC 1023, NGC 1055, NGC 7332, and NGC 7339
Rhode, Katherine L.; Young, Michael D.; Dowell, Jessica L.
We present results from a study of the globular cluster (GC) systems of four spiral and S0 galaxies imaged as part of an ongoing wide-field survey of the GC systems of giant galaxies. The target galaxies—the SB0 galaxy NGC 1023, the SBb galaxy NGC 1055, and an isolated pair comprised of the Sbc galaxy NGC 7339 and the S0 galaxy NGC 7332—were obser…
Examining the Radio-loud/Radio-quiet Dichotomy with New Chandra and VLA Observations of 13 UGC Galaxies
Capetti, A.; Grandi, P.; Chiaberge, M. +7 more
We present the results from new ~15 ks Chandra-ACIS and 4.9 GHz Very Large Array (VLA) observations of 13 galaxies hosting low-luminosity active galactic nuclei (AGNs). This completes the multiwavelength study of a sample of 51 nearby early-type galaxies described in Capetti & Balmaverde and Balmaverde & Capetti. The aim of the three previ…
Detecting Variability in Massive Astronomical Time-series Data. II. Variable Candidates in the Northern Sky Variability Survey
Chang, Seo-Won; Kim, Dae-Won; Byun, Yong-Ik +2 more
We present variability analysis of data from the Northern Sky Variability Survey (NSVS). Using the clustering method, which defines variable candidates as outliers from large clusters, we cluster 16,189,040 light curves having data points at more than 15 epochs as variable and non-variable candidates in 638 NSVS fields. Variable candidates are sel…
A Catalog of Galactic Infrared Carbon Stars
Chen, P. S.; Yang, X. H.
We collected almost all of the Galactic infrared carbon stars (IRCSs) from literature published up to the present to organize a catalog of 974 Galactic IRCSs in this paper. Some of their photometric properties in the near-, mid-, and far-infrared are discussed.
Multi-wavelength GOALS Observations of Star Formation and Active Galactic Nucleus Activity in the Luminous Infrared Galaxy IC 883
Sanders, D. B.; Kim, D. -C.; Surace, J. A. +11 more
New optical Hubble Space Telescope (HST), Spitzer Space Telescope, Galaxy Evolution Explorer, and Chandra observations of the single-nucleus, luminous infrared galaxy (LIRG) merger IC 883 are presented. The galaxy is a member of the Great Observatories All-sky LIRG Survey and is of particular interest for a detailed examination of a luminous late-…
Blending of Cepheids in M33
Macri, Lucas M.; Pellerin, Anne; Chavez, Joy M.
A precise and accurate determination of the Hubble constant based on Cepheid variables requires proper characterization of many sources of systematic error. One of these is stellar blending, which biases the measured fluxes of Cepheids and the resulting distance estimates. We study the blending of 149 Cepheid variables in M33 by matching archival …
Old Massive Globular Clusters and the Stellar Halo of the Dwarf Starburst Galaxy NGC 4449
Caldwell, Nelson; Strader, Jay; Seth, Anil C.
We use Hubble Space Telescope imaging to show that the nearby dwarf starburst galaxy NGC 4449 has an unusual abundance of luminous red star clusters. Joint constraints from integrated photometry, low-resolution spectroscopy, dynamical mass-to-light ratios, and resolved color-magnitude diagrams provide evidence that some of these clusters are old g…
Age and Structure Parameters of the Remote M31 Globular Cluster B514 Based on HST, 2MASS, GALEX, and BATC Observations
Fan, Zhou; Zhou, Xu; Ma, Jun +6 more
B514 is a remote M31 globular cluster (GC) which is located at a projected distance of Rp ~= 55 kpc. Deep observations with the Advanced Camera for Surveys on the Hubble Space Telescope are used to provide accurate integrated light and star counts of B514. By coupling the analysis of the distribution of the integrated light with star co…
Adaptive Optics Observations of 3 µm Water Ice in Silhouette Disks in the Orion Nebula Cluster and M43
Tokunaga, Alan T.; Terada, Hiroshi; Pyo, Tae-Soo +9 more
We present the near-infrared images and spectra of four silhouette disks in the Orion Nebula Cluster (M42) and M43 using the Subaru Adaptive Optics system. While d053-717 and d141-1952 show no water ice feature at 3.1 µm, a moderately deep (τice ~ 0.7) water ice absorption is detected toward d132-1832 and d216-0939. Taking into ac…
Hunting for Young Dispersing Star Clusters in IC 2574
Pellerin, Anne; Harris, Jason; Meyer, Martin M. +1 more
Dissolving stellar groups are very difficult to detect using traditional surface photometry techniques. We have developed a method to find and characterize non-compact stellar systems in galaxies where the young stellar population can be spatially resolved. By carrying out photometry on individual stars, we are able to separate the luminous blue s…