Publications (37)
Nebular Attenuation in Hα-selected Star-forming Galaxies at z=0.8 from the NewHα Survey
Ivelina Momcheva, Janice C. Lee, Chun Ly +5
We present measurements of the dust attenuation of Hα-selected emission-line galaxies at z=0.8 from the NewHα narrowband survey. The analysis is based on deep follow-up spectrosc…
The Relationship between Stellar Mass, Gas Metallicity, and Star Formation Rate for Halpha-selected Galaxies at z~0.8 from the NewHalpha Survey
Mithi A. de los Reyes, Chun Ly, Janice C. Lee +8
Using a sample of 299 Ha-selected galaxies at z~0.8, we study the relationship between galaxy stellar mass, gas-phase metallicity, and star formation rate (SFR), and compare to pre…
Star Formation Rates and Metallicities of K-selected Star Forming Galaxies at z~2
Masao Hayashi, Kentaro Motohara, Kazuhiro Shimasaku +7
We present spectroscopy of 15 star-forming BzK galaxies (sBzKs) with K(AB)<23 in the Subaru Deep Field, for which Halpha and some other emission lines are detected in 0.9 to 2.3 mi…
Lyman-Break Galaxies at in the Subaru Deep Field: Luminosity Function, Clustering and [OIII] Emission
Matthew A. Malkan, Daniel P. Cohen, Miyoko Maruyama +6
We combined deep U-band imaging from the KPNO-4m/MOSAIC camera with very deep multi-waveband data from the optical to infrared, to select Lyman Break Galaxies (LBGs) at z~3 using U…
Metal-poor, Strongly Star-Forming Galaxies in the DEEP2 Survey: The Relationship between Stellar Mass, Temperature-based Metallicity, and Star Formation Rate
Chun Ly, Jane Rigby, Michael Cooper +1
We report on the discovery of 28 metal-poor galaxies in DEEP2. These galaxies were selected for their detection of the weak [OIII]4363 emission line, which provid…
The H-alpha Luminosity Function and Star Formation Rate Volume Density at z=0.8 from the NEWFIRM H-alpha Survey
Chun Ly, Janice C. Lee, Daniel A. Dale +5
[Abridged] We present new measurements of the H-alpha luminosity function (LF) and SFR volume density for galaxies at z~0.8. Our analysis is based on 1.18m narrowband data from…
A Ly-alpha Emitter with an Extremely Large Rest-frame Equivalent Width of ~900A at z=6.5: A Candidate of Population III-dominated Galaxy?
Nobunari Kashikawa, Tohru Nagao, Jun Toshikawa +13
We have identified a very interesting Ly-alpha emitter, whose Ly-alpha emission line has an extremely large observed equivalent width of EW_0=436^{+422}_{-149}A, which corresponds…
Dust Attenuation and H-alpha Star Formation Rates of z~0.5 Galaxies
Chun Ly, Matthew A. Malkan, Nobunari Kashikawa +4
Using deep narrow-band and broad-band imaging, we identify 401 z~0.40 and 249 z~0.49 H-alpha line-emitting galaxies in the Subaru Deep Field. Compared to other H-alpha surveys at s…
Unusual Long and Luminous Optical Transient in the Subaru Deep Field
Yuji Urata, Patrick P. Tsai, Kuiyun Huang +8
We present observations of SDF-05M05, an unusual optical transient discovered in the Subaru Deep Field (SDF). The duration of the transient is > ~800 d in the observer frame, and t…
PEARLS: Near Infrared Photometry in the JWST North Ecliptic Pole Time Domain Field
Christopher N. A. Willmer, Chun Ly, Satoshi Kikuta +23
We present Near-Infrared (NIR) ground-based Y, J, H, and K imaging obtained in the James Webb Space Telescope North Ecliptic Pole Time Domain Field (TDF) using the MMT-Magellan Inf…
A Critical Look at the Mass-Metallicity-SFR Relation in the Local Universe. I. An Improved Analysis Framework and Confounding Systematics
Samir Salim, Janice C. Lee, Chun Ly +5
It has been proposed that the mass-metallicity relation of galaxies exhibits a secondary dependence on star formation rate (SFR), and that the resulting M-Z-SFR relation may be red…
The Luminosity Function and Star Formation Rate between Redshifts of 0.07 and 1.47 for Narrow-band Emitters in the Subaru Deep Field
Chun Ly, Matt A. Malkan, Nobunari Kashikawa +7
Abridged: Subaru Deep Field line-emitting galaxies in four narrow-band filters at low and intermediate redshifts are presented. Broad-band colors, follow-up optical spectroscopy, a…
High Frequency VLBI Imaging of the Jet Base of M87
Chun Ly, R. Craig Walker, William Junor
VLBA and Global VLBI observations of M87 at 43 GHz, some new and some previously published, are used to study the structural evolution of the jet with a spatial resolution of under…
The Stellar Population and Star Formation Rates of z~1.5-1.6 [O II] Emitting Galaxies Selected from Narrow-Band Emission-Line Surveys
Chun Ly, Matthew A. Malkan, Nobunari Kashikawa +5
We present the first detailed study of the stellar populations of star-forming galaxies at z~1.5, which are selected by their [O II] emission line, detected in narrow-band surveys.…
Astro2020: Empirically Constraining Galaxy Evolution
Peter Behroozi, Matthew R. Becker, Frank C. van den Bosch +22
Over the past decade, empirical constraints on the galaxy-dark matter halo connection have significantly advanced our understanding of galaxy evolution. Past techniques have focuse…
The Metal Abundances across Cosmic Time () Survey. I. Optical Spectroscopy in the Subaru Deep Field
Chun Ly, Sangeeta Malhotra, Matthew A. Malkan +4
Deep rest-frame optical spectroscopy is critical for characterizing and understanding the physical conditions and properties of the ionized gas in galaxies. Here, we present a new…
The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
The Astropy Collaboration, Adrian M. Price-Whelan, Pey Lian Lim +133
The Astropy Project supports and fosters the development of open-source and openly-developed Python packages that provide commonly needed functionality to the astronomical communit…
The Structure and Dynamics of the Sub-parsec Scale Jet in M87 Based on 50 VLBA Observations Over 17 Years at 43 GHz
R. Craig Walker, Phillip E. Hardee, Frederick B. Davies +2
The central radio source in M87 provides the best opportunity to study jet formation because it has a large angular size for the gravitational radius of the black hole and has a br…
Optical and near-IR spectroscopy of candidate red galaxies in two z~2.5 proto-clusters
Michelle Doherty, Masayuki Tanaka, Carlos De Breuck +9
We present a spectroscopic campaign to follow-up red colour-selected candidate massive galaxies in two high redshift proto-clusters surrounding radio galaxies. We observed a total…
A Search for Molecular Gas toward a BzK-selected Star-forming Galaxy at z = 2.044
Bunyo Hatsukade, Daisuke Iono, Kentaro Motohara +8
We present a search for CO(3-2) emission in SDF-26821, a BzK-selected star-forming galaxy (sBzK) at z = 2.044, using the 45-m telescope of the Nobeyama Radio Observatory and the No…
Observations of the Structure and Dynamics of the Inner M87 Jet
R. Craig Walker, Philip E. Hardee, Fred Davies +4
M87 is the best source in which to study a jet at high resolution in gravitational units because it has a very high mass black hole and is nearby. The angular size of the black hol…
The Metal Abundances across Cosmic Time () Survey. III -- The relationship between stellar mass and star formation rate in extremely low-mass galaxies
Kaitlyn Shin, Chun Ly, Matthew A. Malkan +3
Extragalactic studies have demonstrated there is a moderately tight (0.3 dex) relationship between galaxy stellar mass () and star formation rate (SFR) that hol…
Physical conditions of the interstellar medium in star-forming galaxies at z~1.5
Masao Hayashi, Chun Ly, Kazuhiro Shimasaku +6
We present results from Subaru/FMOS near-infrared (NIR) spectroscopy of 118 star-forming galaxies at in the Subaru Deep Field. These galaxies are selected as [OII]37…
Emission-Line Galaxies from the Hubble Space Telescope Probing Evolution and Reionization Spectroscopically (PEARS) Grism Survey. II: The Complete Sample
Nor Pirzkal, Barry Rothberg, Chun Ly +13
We present a full analysis of the Probing Evolution And Reionization Spectroscopically (PEARS) slitess grism spectroscopic data obtained with the Advanced Camera for Surveys on HST…
"Direct" Gas-phase Metallicities, Stellar Properties, and Local Environments of Emission-line Galaxies at Redshift below 0.90
Chun Ly, Matthew A. Malkan, Tohru Nagao +3
Using deep narrow-band (NB) imaging and optical spectroscopy from the Keck telescope and MMT, we identify a sample of 20 emission-line galaxies (ELGs) at z=0.065-0.90 where the wea…
The Stellar Population of Metal-Poor Galaxies at z 0.8 and the Evolution of the Mass-Metallicity Relation
Andrew Weldon, Chun Ly, Michael Cooper
We present results from deep Spitzer/Infrared Array Camera (IRAC) observations of 28 metal-poor, strongly star-forming galaxies selected from the DEEP2 Galaxy Survey. By modelling…
A Census of Star-Forming Galaxies at z = 1-3 in the Subaru Deep Field
Chun Ly, Matthew A. Malkan, Masao Hayashi +5
Several UV and near-infrared color selection methods have identified galaxies at z = 1-3. Since each method suffers from selection biases, we have applied three leading techniques…
The JCMT SCUBA-2 Survey of the James Webb Space Telescope North Ecliptic Pole Time-Domain Field
Minhee Hyun, Myungshin Im, Ian R. Smail +14
The James Webb Space Telescope Time-Domain Field (JWST-TDF) is an 14 diameter field near the North Ecliptic Pole that will be targeted by one of the JWST Guaranteed Time O…
The Metal Abundances across Cosmic Time () Survey. II. Evolution of the Mass-Metallicity Relation over 8 Billion Years, using [OIII]4363Ã -based Metallicities
Chun Ly, Matthew A. Malkan, Jane Rigby +1
We present the first results from MMT and Keck spectroscopy for a large sample of emission-line galaxies selected from our narrow-band imaging in the Subaru Deep F…
Lyman Break Galaxies at z~1.8-2.8: GALEX/NUV Imaging of the Subaru Deep Field
Chun Ly, Matthew A. Malkan, Tommaso Treu +7
Abridged: A photometric sample of ~7100 V<25.3 Lyman break galaxies (LBGs) has been selected by combining Subaru/Suprime-Cam BVRci'z' data with deep GALEX/NUV imaging of the Subaru…
Spitzer Space Telescope Constraint on the Stellar Mass of a z = 6.96 Lyman Alpha Emitter
Kazuaki Ota, Chun Ly, Matthew A. Malkan +7
We obtained mid-infrared 3.6 and 4.5 micron imaging of a z=6.96 Lyman alpha emitter (LAE) IOK-1 discovered in the Subaru Deep Field, using Spitzer Space Telescope Infrared Array Ca…
Completing the Census of Ly-alpha Emitters at the Reionization Epoch
Nobunari Kashikawa, Kazuhiro Shimasaku, Yuichi Matsuda +16
We carried out extended spectroscopic confirmations of Ly-alpha emitters (LAEs) at z=6.5 and 5.7 in the Subaru Deep Field. Now, the total number of spectroscopically confirmed LAEs…
A photometric survey for Lyalpha-HeII dual emitters: Searching for Population III stars in high-redshift galaxies
Tohru Nagao, Shunji Sasaki, Roberto Maiolino +9
We present a new photometric search for high-z galaxies hosting Population III (PopIII) stars based on deep intermediate-band imaging observations obtained in the Subaru Deep Field…
Multiband VLA Observations of the Faint Radio Core of 3CR 68.1
Michael S. Brotherton, Chun Ly, Beverley J. Wills +3
The large, powerful Fanaroff-Riley class II radio source 3CR 68.1 is an optically red quasar with strong evidence for dust reddening, intrinsic ultraviolet line absorption, and X-r…
Imaging a Jet Base - Prospects with M87
R. Craig Walker, Chun Ly, William Junor +1
M87 provides the best opportunity to study the base of a jet where it is collimated and accelerated. The size of that region scales with the mass of the black hole, and M87 has the…
High-redshift Ly alpha emitters with a large equivalent width: Properties of i-dropout galaxies with an NB921-band depression in the Subaru Deep Field
Tohru Nagao, Takashi Murayama, Roberto Maiolino +11
We report new follow-up spectroscopy of i-dropout galaxies with an NB921-band depression found in the Subaru Deep Field. The NB921-depressed i-dropout selection method is expected…
Average Metallicity and Star Formation Rate of Lya Emitters Probed by a Triple Narrow-Band Survey
Kimihiko Nakajima, Masami Ouchi, Kazuhiro Shimasaku +9
We present the average metallicity and star-formation rate of Lya emitters (LAEs) measured from our large-area survey with three narrow-band (NB) filters covering the Lya, [OII]372…