Search Publications
Spatially Resolved HST Grism Spectroscopy of a Lensed Emission Line Galaxy at z ~ 1
Broadhurst, Tom; Frye, Brenda L.; Bowen, David V. +6 more
We take advantage of gravitational lensing amplification by A1689 (z = 0.187) to undertake the first space-based census of emission line galaxies (ELGs) in the field of a massive lensing cluster. Forty-three ELGs are identified to a flux of i 775 = 27.3 via slitless grism spectroscopy. One ELG (at z = 0.7895) is very bright owing to len…
The Central Blue Straggler Population in Four Outer-halo Globular Clusters
Lützgendorf, Nora; Ferraro, Francesco R.; Lanzoni, Barbara +6 more
Using Hubble Space Telescope/Wide Field Planetary Camera 2 data, we have performed a comparative study of the Blue Straggler Star (BSS) populations in the central regions of the globular clusters (GCs) AM 1, Eridanus, Palomar 3, and Palomar 4. Located at distances R GC > 50 kpc from the Galactic center, these are (together with Palom…
Detection of the 3.3 µm Aromatic Feature in the Supernova Remnant N49 with AKARI
Onaka, Takashi; Seok, Ji Yeon; Koo, Bon-Chul
We present an infrared (IR) study of the supernova remnant (SNR) N49 in the Large Magellanic Cloud with the near-IR (NIR; 2.5-5 µm) spectroscopic observations performed by AKARI. The observations were performed as a coarse spectral mapping to cover most of the bright region in the east, which enables us to compare the distribution of various…
Near-infrared Survey of the GOODS-North Field: Search for Luminous Galaxy Candidates at z >~ 6.5
Ferguson, Henry C.; Hathi, Nimish P.; Mobasher, Bahram +2 more
We present near-infrared (NIR; J and K s) survey of the Great Observatories Origins Deep Survey-North (GOODS-N) field. The publicly available imaging data were obtained using the MOIRCS instrument on the 8.2 m Subaru and the WIRCam instrument on the 3.6 m Canada-France-Hawaii Telescope (CFHT). These observations fulfill a serious wavele…
Chandra and Hubble Space Telescope Observations of the Supersoft ULX in NGC 247: Candidate for Standard Disk Emission
Tao, Lian; Feng, Hua; Grisé, Fabien +2 more
We report on multiwavelength observations of the supersoft ultraluminous X-ray source (ULX) in NGC 247 made with the Chandra X-Ray Observatory and Hubble Space Telescope. We aligned the X-ray and optical images using three objects present on both and identified a unique, point-like optical counterpart to the ULX. The X-ray to optical spectrum is w…
The Dwarf Starburst Host Galaxy of a Type Ia Supernova at z = 1.55 from CANDELS
Mobasher, Bahram; Riess, Adam G.; Hjorth, Jens +4 more
We present VLT/X-shooter observations of a high-redshift, Type Ia supernova (SN Ia) host galaxy, discovered with HST/WFC3 as part of the CANDELS Supernova project. The galaxy exhibits strong emission lines of Lyα, [O II], Hβ, [O III], and Hα at z = 1.54992+0.00008 -0.00004. From the emission-line fluxes and spectral energy di…
Planetary Nebulae Detected in the Spitzer Space Telescope GLIMPSE 3D Legacy Survey
Zhang, Yong; Kwok, Sun; Hsia, Chih-Hao
We used the data from the Spitzer Legacy Infrared Mid-Plane Survey Extraordinaire (GLIMPSE) to investigate the mid-infrared (MIR) properties of planetary nebulae (PNs) and PN candidates. In previous studies of GLIMPSE I and II data, we have shown that these MIR data are very useful in distinguishing PNs from other emission-line objects. In the pre…
New Variable Jet Models for HH 34
Raga, A. C.; Noriega-Crespo, A.; Esquivel, A. +1 more
We consider newly derived proper motions of the HH 34 jet to reconstruct the evolution of this outflow. We first extrapolate ballistic trajectories for the knots (starting from their present-day positions and velocities) and find that at ~1000 yr in the future most of them will merge to form a larger-mass structure. This mass structure will be for…
Tidal Interactions at the Edge of the Local Group: New Evidence for Tidal Features in the Antlia Dwarf Galaxy
Conselice, Christopher J.; Penny, Samantha J.; Pimbblet, Kevin A. +3 more
Using deep B-band imaging down to ~µ B = 26 mag arcsec-2, we present evidence for tidal tails in the Antlia Dwarf galaxy, one of the most distant members of the Local Group. This elongation is in the direction of Antlia's nearest neighbor, the Magellanic-type NGC 3109. The tail is offset by <10° from a vector linkin…
Chandra and Suzaku Observations of the Be/X-Ray Star HD110432
Nowak, M. A.; Torrejón, J. M.; Schulz, N. S.
We present an analysis of a pointed 141 ks Chandra high-resolution transmission gratings observation of the Be X-ray emitting star HD110432, a prominent member of the γ Cas analogs. This observation represents the first high-resolution spectrum taken for this source as well as the longest uninterrupted observation of any γ Cas analog. The Chandra …