Publications (31)
Bringing manifold learning and dimensionality reduction to SED fitters
Shoubaneh Hemmati, Peter Capak, Milad Pourrahmani +8
We show unsupervised machine learning techniques are a valuable tool for both visualizing and computationally accelerating the estimation of galaxy physical properties from photome…
Photometric Redshift Calibration Requirements for WFIRST Weak Lensing Cosmology: Predictions from CANDELS
Shoubaneh Hemmati, Peter Capak, Daniel Masters +7
In order for Wide-Field Infrared Survey Telescope (WFIRST) and other Stage IV dark energy experiments (e.g., Large Synoptic Survey Telescope; LSST, and Euclid) to infer cosmologica…
SPLASH-SXDF Multi-wavelength Photometric Catalog
Vihang Mehta, Claudia Scarlata, Peter Capak +19
We present a multi-wavelength catalog in the Subaru-XMM Deep Field (SXDF) as part of the Spitzer Large Area Survey with Hyper-Suprime-Cam (SPLASH). We include the newly acquired op…
Identifying and Repairing Catastrophic Errors in Galaxy Properties Using Dimensionality Reduction
Beryl Hovis-Afflerbach, Charles L. Steinhardt, Daniel Masters +1
Our understanding of galaxy evolution is derived from large surveys designed to maximize efficiency by only observing the minimum amount needed to infer properties for a typical ga…
Physical Properties of Emission-Line Galaxies at z ~ 2 from Near-Infrared Spectroscopy with Magellan FIRE
Daniel Masters, Patrick McCarthy, Brian Siana +16
We present results from near-infrared spectroscopy of 26 emission-line galaxies at z ~ 2 obtained with the FIRE spectrometer on the Magellan Baade telescope. The sample was selecte…
SPHEREx: NASA's Near-Infrared Spectrophotmetric All-Sky Survey
Brendan P. Crill, Michael Werner, Rachel Akeson +51
SPHEREx, the Spectro-Photometer for the History of the Universe, Epoch of Reionization, and ices Explorer, is a NASA MIDEX mission planned for launch in 2024. SPHEREx will carry ou…
Categorizing models using Self-Organizing Maps: an application to modified gravity theories probed by cosmic shear
Agnès Ferté, Shoubaneh Hemmati, Daniel Masters +4
We propose to use Self-Organizing Maps (SOM) to map the impact of physical models onto observables. Using this approach, we are be able to determine how theories relate to each oth…
Low Masses and High Redshifts: The Evolution of the Mass-Metallicity Relation
Alaina Henry, Claudia Scarlata, Alberto Dominguez +15
We present the first robust measurement of the high redshift mass-metallicity (MZ) relation at 10^{8}< M/M_{\sun} < 10^{10}, obtained by stacking spectra of 83 emission-line galaxi…
Star Formation at From the Spitzer Large Area Survey with Hyper-Suprime-Cam (SPLASH)
Charles L. Steinhardt, Josh S. Speagle, Peter Capak +21
Using the first 50% of data collected for the Spitzer Large Area Survey with Hyper-Suprime-Cam (SPLASH) observations on the 1.8 deg Cosmological Evolution Survey (COSMOS) we es…
Parallel Application of Slitless Spectroscopy to Analyze Galaxy Evolution (PASSAGE): Survey Overview
Matthew A. Malkan, Vihang Mehta, Ayan Acharyya +49
During the second half of Cycle 1 of the James Webb Space Telescope (JWST), we conducted the Parallel Application of Slitless Spectroscopy to Analyze Galaxy Evolution (PASSAGE) pro…
The First Hundred Brown Dwarfs Discovered by the Wide-field Infrared Survey Explorer (WISE)
J. Davy Kirkpatrick, Michael C. Cushing, Christopher R. Gelino +37
We present ground-based spectroscopic verification of six Y dwarfs (see Cushing et al), eighty-nine T dwarfs, eight L dwarfs, and one M dwarf identified by the Wide-field Infrared…
Predicting Hα emission line galaxy counts for future galaxy redshift surveys
Alexander Merson, Yun Wang, Andrew Benson +4
Knowledge of the number density of H emitting galaxies is vital for assessing the scientific impact of the Euclid and WFIRST missions. In this work we present predictions from…
Predicting the Spectroscopic Features of Galaxies by Applying Manifold Learning on Their Broad-Band Colors: Proof of Concept and Potential Applications for Euclid, Roman, and Rubin LSST
Marziye Jafariyazani, Daniel Masters, Andreas Faisst +2
Entering the era of large-scale galaxy surveys which will deliver unprecedented amounts of photometric and spectroscopic data, there is a growing need for more efficient, data driv…
SpecPro: An Interactive IDL Program for Viewing and Analyzing Astronomical Spectra
Daniel Masters, Peter Capak
We present an interactive IDL program for viewing and analyzing astronomical spectra in the context of modern imaging surveys. SpecPro's interactive design lets the user simultaneo…
The Complete Calibration of the Color-Redshift Relation (C3R2) Survey: Survey Overview and Data Release 1
Daniel Masters, Daniel Stern, Judith Cohen +4
A key goal of the Stage IV dark energy experiments Euclid, LSST and WFIRST is to measure the growth of structure with cosmic time from weak lensing analysis over large regions of t…
Cosmology with the SPHEREX All-Sky Spectral Survey
Olivier Doré, Jamie Bock, Matthew Ashby +30
SPHEREx (Spectro-Photometer for the History of the Universe, Epoch of Reionization, and Ices Explorer) ( http://spherex.caltech.edu ) is a proposed all-sky spectroscopic survey sat…
Spectroscopic Confirmation of a Coma Cluster Progenitor at z ~ 2.2
Behnam Darvish, Nick Z. Scoville, Christopher Martin +17
We report the spectroscopic confirmation of a new protocluster in the COSMOS field at 2.2, COSMOS Cluster 2.2 (CC2.2), originally identified as an overdensity of narrowb…
An Empirical Approach to Cosmological Galaxy Survey Simulation: Application to SPHEREx Low-Resolution Spectroscopy
Nathaniel R. Stickley, Peter Capak, Daniel Masters +3
Highly accurate models of the galaxy population over cosmological volumes are necessary in order to predict the performance of upcoming cosmological missions. We present a data-dri…
The End of Galaxy Surveys
Jason Rhodes, Eric Huff, Daniel Masters +1
For nearly a century, imaging and spectroscopic surveys of galaxies have given us information about the contents of the universe. We attempt to define the logical endpoint of such…
SPHEREx 0.75 to 5 m Spectra for a Sequence of Nearby Brown Dwarfs
Zafar Rustamkulov, J. Kirkpatrick, Rachel Akeson +21
The SPHEREx all-sky survey has now measured the R40-100 infrared spectra of thousands of nearby brown dwarfs in the chemically rich 0.75-5 m range. The survey's wide spec…
Evolution of the Quasar Luminosity Function Over 3 < z < 5 in the COSMOS Survey Field
Daniel Masters, Peter Capak, Mara Salvato +10
We investigate the high-redshift quasar luminosity function (QLF) down to an apparent magnitude of I(AB) = 25 in the Cosmic Evolution Survey (COSMOS). Careful analysis of the exten…
A Tight Relation Between N/O Ratio and Galaxy Stellar Mass Can Explain the Evolution of Strong Emission Line Ratios with Redshift
Daniel Masters, Andreas Faisst, Peter Capak
The offset of high redshift star-forming galaxies in the [OIII]/H versus [NII]/H (O3N2) diagram in comparison with the local star-forming galaxy sequence is now well establ…
The Local [CII] 158 um Emission Line Luminosity Function
Shoubaneh Hemmati, Lin Yan, Tanio Diaz-Santos +4
We present, for the first time, the local [CII] 158 um emission line luminosity function measured using a sample of more than 500 galaxies from the Revised Bright Galaxy Sample (RB…
Mapping the Galaxy Color-Redshift Relation: Optimal Photometric Redshift Calibration Strategies for Cosmology Surveys
Daniel Masters, Peter Capak, Daniel Stern +17
Calibrating the photometric redshifts of >10^9 galaxies for upcoming weak lensing cosmology experiments is a major challenge for the astrophysics community. The path to obtaining t…
Joint Survey Processing. III. Compact Oddballs in the COSMOS Field -- Little Red Dots and Transients
Yu-Heng Lin, Andreas L. Faisst, Ranga-Ram Chary +7
We present the HST ACS G800L grism spectroscopy observation of the faint active galactic nuclei (AGN) candidates in the COSMOS field at redshift of 6 selected by the point-source m…
The SPHEREx Ices Investigation: An Overview
Gary J. Melnick, Joseph L. Hora, Matthew L. N. Ashby +26
SPHEREx is a NASA mission designed to perform an all-sky spectroscopic survey in the 0.75 - 5 m wavelength range. Its primary science objectives are to investigate: (1) inflati…
Empirical Modeling of the Redshift Evolution of the [NII]/H-ratio for Galaxy Redshift Surveys
Andreas L. Faisst, Daniel Masters, Yun Wang +4
We present an empirical parameterization of the [NII]/H flux ratio as a function of stellar mass and redshift valid at 0 < z < 2.7 and 8.5 < log(M) < 11.0. This description can…
Discovery of Three Distant, Cold Brown Dwarfs in the WFC3 Infrared Spectroscopic Parallels Survey
Daniel Masters, Patrick McCarthy, Adam J. Burgasser +12
We present the discovery of three late type (>T4) brown dwarfs, including a probable Y dwarf, in the WFC3 Infrared Spectroscopic Parallels (WISP) Survey. We use the G141 grism spec…
The Wide Field Infrared Survey Telescope: 100 Hubbles for the 2020s
Rachel Akeson, Lee Armus, Etienne Bachelet +103
The Wide Field Infrared Survey Telescope (WFIRST) is a 2.4m space telescope with a 0.281 deg^2 field of view for near-IR imaging and slitless spectroscopy and a coronagraph designe…
A comparative analysis of virial black-hole mass estimates of moderate-luminosity active galactic nuclei using Subaru/FMOS
Kenta Matsuoka, John D. Silverman, Malte Schramm +27
We present an analysis of broad emission lines observed in moderate-luminosity active galactic nuclei (AGNs), typical of those found in X-ray surveys of deep fields, with the aim t…
Mapping the Galaxy Color-Star Formation Rate Relation with Manifold Learning and Infrared Image Stacking
Yu-Heng Lin, Daniel Masters, Andreas L. Faisst +7
Modern surveys present us with billions of faint galaxies for which we only have broadband images in 6-8 optical-to-near-infrared (NIR) filters. Galaxy star formation rates (…