Search Publications
Hubble Space Telescope Photometry of Globular Clusters in M81
Nantais, Julie B.; Huchra, John P.; Zezas, Andreas +2 more
We perform aperture photometry and profile fitting on 419 globular cluster (GC) candidates with mV <= 23 mag identified in Hubble Space Telescope/Advanced Camera for Surveys BVI imaging, and estimate the effective radii of the clusters. We identify 85 previously known spectroscopically confirmed clusters, and newly identify 136 objec…
V2492 Cygni: The Early Evolution of the 2010 Outburst
Aspin, Colin
We present Gemini-North optical and near-IR observations of a young eruptive star in Cygnus, designated as V2492 Cygni in the General Catalog of Variable Stars. This object is one of two young stars, located within 2 deg of each other, that recently brightened by around 5 mag and were reported as possible new FU Orionis-type variables. The outburs…
Infrared Narrowband Tomography of the Local Starburst NGC 1569 with the Large Binocular Telescope/LUCIFER
Quirrenbach, A.; Rix, H. -W.; Brandner, W. +24 more
We used the near-IR imager/spectrograph LUCIFER mounted on the Large Binocular Telescope to image, with subarcsecond seeing, the local dwarf starburst NGC 1569 in the JHK bands and He I 1.08 µm, [Fe II] 1.64 µm, and Brγ narrowband filters. We obtained high-quality spatial maps of He I 1.08 µm, [Fe II] 1.64 µm, and Brγ emiss…
The 100 Myr Star Formation History of NGC 5471 from Cluster and Resolved Stellar Photometry
Pérez, Enrique; Cerviño, Miguel; Díaz, Ángeles I. +2 more
We show that star formation in the giant H II region NGC 5471 has been ongoing during the past 100 Myr. Using Hubble Space Telescope/Wide-Field Planetary Camera 2 F547M and F675W, ground-based JHK s , and GALEX FUV and NUV images, we have conducted a photometric study of the star formation history (SFH) in the massive giant extragalact…
Ultraviolet Discoveries at Asteroid (21) Lutetia by the Rosetta Alice Ultraviolet Spectrograph
Scherrer, J. R.; Stern, S. A.; Feldman, P. D. +11 more
The NASA Alice ultraviolet (UV) imaging spectrograph on board the ESA Rosetta comet orbiter successfully conducted a series of flyby observations of the large asteroid (21) Lutetia in the days surrounding Rosetta's closest approach on 2010 July 10. Observations included a search for emission lines from gas, and spectral observations of the Lutetia…
Spectroscopic Study of the HST/ACS PEARS Emission-line Galaxies
Pirzkal, Norbert; Xia, Lifang; Malhotra, Sangeeta +6 more
We present spectroscopy of 76 emission-line galaxies (ELGs) in Chandra Deep Field South taken with the LDSS3 spectrograph on the Magellan Telescope. These galaxies are selected because they have emission lines with the Advanced Camera for Surveys (ACS) grism data in the Hubble Space Telescope Probing Evolution and Reionization Spectroscopically (P…
Characterization of Optically Selected Star-Forming Knots in (U)LIRGs
Arribas, Santiago; Colina, Luis; Duc, Pierre-Alain +1 more
We present a comprehensive characterization of the general properties (luminosity functions (LFs), mass, size, ages, etc.) of optically selected compact stellar objects (knots) in a representative sample of 32 low-z luminous and ultraluminous infrared galaxies ((U)LIRGs). It is important to understand the formation and evolution of these propertie…
A Two-dimensional Map of the Color Excess in NGC 3603
Grebel, Eva K.; Pang, Xiaoying; Pasquali, Anna
Using archival Hubble Space Telescope/Wide Field Camera 3 images centered on the young HD 97950 star cluster in the giant H II region NGC 3603, we computed the pixel-to-pixel distribution of the color excess, E(B - V)g, of the gas associated with this cluster from its Hα/Paβ flux ratio. At the assumed distance of 6.9 kpc, the resulting …
Far-infrared Imaging of Post-asymptotic Giant Branch Stars and (Proto)-planetary Nebulae with the AKARI Far-Infrared Surveyor
García-Lario, P.; García-Hernández, D. A.; Manchado, A. +1 more
By tracing the distribution of cool dust in the extended envelopes of post-asymptotic giant branch stars and (proto)-planetary nebulae ((P)PNe), we aim to recover, or constrain, the mass-loss history experienced by these stars in their recent past. The Far-Infrared Surveyor (FIS) instrument on board the AKARI satellite was used to obtain far-infra…
Physical Structure of the Planetary Nebula NGC 3242 from the Hot Bubble to the Nebular Envelope
Guerrero, Martín A.; Chu, You-Hua; Gruendl, Robert A. +1 more
One key feature of the interacting stellar winds model of the formation of planetary nebulae (PNe) is the presence of shock-heated stellar wind confined in the central cavities of PNe. This so-called hot bubble should be detectable in X-rays. Here we present XMM-Newton observations of NGC 3242, a multiple-shell PN whose shell morphology is consist…