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17 papers
GMP-selected dual and lensed AGNs: selection function and classification based on near-IR colors and resolved spectra from VLT/ERIS, KECK/OSIRIS, and LBT/LUCI
F. Mannucci, M. Scialpi, A. Ciurlo +44
The Gaia-Multi-Peak (GMP) technique can be used to identify large numbers of dual or lensed AGN candidates at sub-arcsec separation, allowing us to study both multiple SMBHs in the…
Disk or Companion: Characterizing Excess Infrared Flux in Seven White Dwarf Systems with Near-Infrared Spectroscopy
Dylan Owens, Siyi Xu, Elena Manjavacas +7
Excess infrared flux from white dwarf stars is likely to arise from a dusty debris disk or a cool companion. In this work, we present near-infrared spectroscopic observations with…
Liger at Keck Observatory: Imager Detector and IFS Pick-off Mirror Assembly
Maren Cosens, Shelley A. Wright, Aaron Brown +14
Liger is a next-generation near-infrared imager and integral field spectrograph (IFS) planned for the W.M. Keck Observatory. Liger is designed to take advantage of improved adaptiv…
Liger at Keck Observatory: Design of the Data Reduction System and Software Interfaces
Nils Rundquist, Andrea Zonca, Arun Surya +15
Liger is a second generation near-infrared imager and integral field spectrograph (IFS) for the W. M. Keck Observatory that will utilize the capabilities of the Keck All-sky Precis…
Liger at Keck Observatory: Design of Imager Optical Assembly and Spectrograph Re-Imaging Optics
James Wiley, Aaron Brown, Renate Kupke +13
Liger is an adaptive optics (AO) fed imager and integral field spectrograph (IFS) designed to take advantage of the Keck All-sky Precision Adaptive-optics (KAPA) upgrade for the W.…
Using Non-Negative Matrix Factorization to Improve Calibration of the Keck OSIRIS Integral Field Spectrograph
Katelyn Horstman, Michael P. Fitzgerald, James E. Lyke +2
Integral Field Spectrographs (IFS) often require non-trivial calibration techniques to process raw data. The OH Suppressing InfraRed Imaging Spectrograph (OSIRIS) at the W. M. Keck…
A Characterization of the Circumstellar Gas around WD 1124-293 using Cloudy
Amy Steele, John Debes, Siyi Xu +2
Between 30 - 50% of white dwarfs (WDs) show heavy elements in their atmospheres. This "pollution" is thought to arise from the accretion of planetesimals perturbed by outer planet(…
Background Infrared Sources for Studying the Galactic Center's Interstellar Gas
T. R. Geballe, E. Lambrides, B. Schlegelmilch +5
We briefy describe the results of a K-band spectroscopic survey of over 500 highly reddened point-like objects on sightlines toward the Central Molecular Zone (CMZ) of the Galaxy.…
Super-Eddington Accretion in the WISE-Selected Extremely Luminous Infrared Galaxy W2246-0526
Chao-Wei Tsai, Peter Eisenhardt, Hyunsung Jun +8
We use optical and near-infrared spectroscopy to observe rest-UV emission lines and estimate the black hole mass of WISEA J224607.56-052634.9 (W2246-0526) at z = 4.601, the most lu…
The MALATANG Survey: the L_gas-L_IR correlation on sub-kiloparsec scale in six nearby star-forming galaxies as traced by HCN J=4-3 and HCO^+ J=4-3
Qing-Hua Tan, Yu Gao, Zhi-Yu Zhang +43
We present HCN J=4-3 and HCO^+ J=4-3 maps of six nearby star-forming galaxies, NGC 253, NGC 1068, IC 342, M82, M83, and NGC 6946, obtained with the James Clerk Maxwell Telescope as…
The Hyper Suprime-Cam SSP Survey: Overview and Survey Design
H. Aihara, N. Arimoto, R. Armstrong +139
Hyper Suprime-Cam (HSC) is a wide-field imaging camera on the prime focus of the 8.2m Subaru telescope on the summit of Maunakea in Hawaii. A team of scientists from Japan, Taiwan…
Molecular and Ionized Hydrogen in 30 Doradus. I. Imaging Observations
Sherry C. C. Yeh, Ernest R. Seaquist, Christopher D. Matzner +1
We present the first fully calibrated H, 1-0 S(1) image of the entire 30 Doradus nebula. The observations were conducted using the NOAO Extremely Wide-Field Infrared Imager on…
Line Emission from Radiation-Pressurized HII Regions I: Internal Structure and Line Ratios
Sherry C. C. Yeh, Silvia Verdolini, Mark R. Krumholz +2
The emission line ratios [OIII]5007/H-beta and [NII]6584/H-alpha have been adopted as an empirical way to distinguish between the fundamentally different mechanisms of ionization i…
Line Emission from Radiation-Pressurized HII Region II: Dynamics and Population Synthesis
Silvia Verdolini, Sherry C. C. Yeh, Mark R. Krumholz +2
Optical and infrared emission lines from HII regions are an important diagnostic used to study galaxies, but interpretation of these lines requires significant modeling of both the…
Ionization Parameter as a Diagnostic of Radiation and Wind Pressures in H II Regions and Starburst Galaxies
Sherry C. C. Yeh, Christopher D. Matzner
The ionization parameter U is potentially useful for measuring radiation pressure feedback from massive star clusters, as it reflects the radiation-to-gas-pressure ratio and is rea…
The CO Molecular Outflows of IRAS 16293-2422 Probed by the Submillimeter Array
Sherry C. C. Yeh, Naomi Hirano, Tyler L. Bourke +4
We have mapped the proto-binary source IRAS 16293-2422 in CO 2-1, 13CO 2-1, and CO 3-2 with the Submillimeter Array (SMA). The maps with resolution of 1".5-5" reveal a single small…
Arcsecond-Resolution Submillimeter HCN Imaging of the Binary Protostar IRAS 16293-2422
S. Takakuwa, N. Ohashi, T. Bourke +6
(Abridged) With the SMA we have made high angular-resolution (~1" = 160 AU) observations of the protobinary system IRAS 16293-2422 in the J = 4-3 lines of HCN and HC^15N, and in th…