Search Publications
CLASH: Extreme Emission-line Galaxies and Their Implication on Selection of High-redshift Galaxies
Donahue, Megan; Broadhurst, Tom; Frye, Brenda L. +23 more
We utilize the Cluster Lensing And Supernova survey with Hubble observations of 25 clusters to search for extreme emission-line galaxies (EELGs). The selections are carried out in two central bands: F105W (Y 105) and F125W (J 125), as the flux of the central bands could be enhanced by the presence of [O III] λλ4959, 5007 at r…
A Combined Spitzer and Herschel Infrared Study of Gas and Dust in the Circumbinary Disk Orbiting V4046 Sgr
Kastner, Joel H.; Wilner, David; Andrews, Sean +6 more
We present results from a spectroscopic Spitzer and Herschel mid-to-far-infrared study of the circumbinary disk orbiting the evolved (age ∼12-23 Myr) close binary T Tauri system V4046 Sgr. Spitzer InfraRed Spectrograph spectra show emission lines of [Ne ii], H2 S(1), CO2, and HCN, while Herschel Photodetector Array Camera and…
Star Formation Activity in the Long, Filamentary Infrared Dark Cloud G53.2
Koo, Bon-Chul; Kim, Hyun-Jeong; Davis, Christopher J.
We present star formation activity in the infrared dark cloud (IRDC) G53.2, a remarkable IRDC located at Galactic coordinates (l,b)∼ (53\buildrel{\circ}\over{.} 2, 0\buildrel{\circ}\over{.} 0) based on the census of young stellar object (YSO) candidates. IRDC G53.2 was previously identified as several IRDCs in mid-IR images, but it is in fact a lo…
The Cheshire Cat Gravitational Lens: The Formation of a Massive Fossil Group
White, Raymond E., III; Maksym, W. Peter; Dupke, Renato +3 more
The Cheshire Cat is a relatively poor group of galaxies dominated by two luminous elliptical galaxies surrounded by at least four arcs from gravitationally lensed background galaxies that give the system a humorous appearance. Our combined optical/X-ray study of this system reveals that it is experiencing a line of sight merger between two groups …
Host Galaxy Properties and Black Hole Mass of Swift J164449.3+573451 from Multi-wavelength Long-term Monitoring and HST Data
Urata, Yuji; Sakamoto, Takanori; Im, Myungshin +6 more
We study the host galaxy properties of the tidal disruption object Swift J164449.3+573451 using long-term optical to near-infrared (NIR) data. First, we decompose the galaxy surface brightness distribution and analyze the morphology of the host galaxy using high-resolution Hubble Space Telescope WFC3 images. We conclude that the host galaxy is bul…
The Transitional Disk around IRAS 04125+2902
Andrews, S.; Wilner, D.; Espaillat, C. +4 more
Resolved submillimeter imaging of transitional disks is increasingly revealing the complexity of disk structure. Here, we present the first high-resolution submillimeter image of a recently identified transitional disk around IRAS 04125+2902 in the Taurus star-forming region. We measure an inner disk hole of ∼20 AU around IRAS 04125+2902 by simult…
Discovery of Collimated Bipolar Outflows in the Planetary Nebula Th 2-A
Danehkar, A.
We present a comprehensive set of spatially resolved, integral field spectroscopic mapping of the Wolf-Rayet planetary nebula Th 2-A, obtained using the Wide Field Spectrograph on the Australian National University 2.3-m telescope. Velocity-resolved Hα channel maps with a resolution of 20 km s-1 allow us to identify different kinematic …
Infrared Two-Color Diagrams for AGB Stars, Post-AGB Stars, and Planetary Nebulae
Suh, Kyung-Won
We present various infrared two-color diagrams (2CDs) for asymptotic giant branch (AGB) stars, post-AGB stars, and Planetary Nebulae (PNe) and investigate possible evolutionary tracks. We use catalogs from the available literature for the sample of 4903 AGB stars (3373 O-rich; 1168 C-rich; 362 S-type), 660 post-AGB stars (326 post-AGB; 334 pre-PN)…
A Search for Population III Galaxies in CLASH. I. Singly-imaged Candidates at High Redshift
Östlin, Göran; Melinder, Jens; Zitrin, Adi +6 more
Population III (Pop III) galaxies are predicted to exist at high redshifts and may be rendered sufficiently bright for detection with current telescopes when gravitationally lensed by a foreground galaxy cluster. Pop III galaxies that exhibit strong Lyα emission should furthermore be identifiable from broadband photometry because of their unusual …
Broadband X-Ray Spectral Investigations of Magnetars, 4U 0142+61, 1E 1841-045,1E 2259+586, AND 1E 1048.1-5937
Göğüş, Ersin; Weng, Shan-Shan
We have generated an extended version of a rather simplified but physically oriented three-dimensional magnetar emission model, STEMS3D, to allow spectral investigations up to 100 keV. We then applied our model to the broadband spectra of four magnetars: 4U 0142+61, 1E 1841-045, 1E 2259+586, and 1E 1048.1-5937, using data collected with Swift/XRT …