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Multi-resolution Filtering: An Empirical Method for Isolating Faint, Extended Emission in Dragonfly Data and Other Low Resolution Images
van Dokkum, Pieter; Abraham, Roberto; Danieli, Shany +6 more
We describe an empirical, self-contained method to isolate faint, large-scale emission in imaging data of low spatial resolution. Multi-resolution filtering (MRF) uses independent data of superior spatial resolution and point source depth to create a model for all compact and high surface brightness objects in the field. This model is convolved wi…
Tests of Catastrophic Outlier Prediction in Empirical Photometric Redshift Estimation with Redshift Probability Distributions
Singal, J.; Jones, E.
We present results of using individual galaxies’ redshift probability information derived from a photometric redshift (photo-z) algorithm, SPIDERz, to identify potential catastrophic outliers in photometric redshift determinations. By using two test data sets comprised of COSMOS multi-band photometry spanning a wide redshift range (0 < z < 4…
Structures, Stellar Population Properties, AGN Fractions, and Environments of Massive Compact Galaxies at 1 < z < 2 in 3D-HST/CANDELS
Fang, Guanwen; Gu, Yizhou; Yuan, Qirong +1 more
We present a study on structures and physical properties of massive (M* > 1010M⊙) compact galaxies at 1.0 < z < 2.0 in five 3D-HST/CANDELS fields. Compared with the extended star-forming galaxies (eSFGs), compact star-forming galaxies (cSFGs) are found to have the lower level of star formation, and mainly …
Comparison of Multi-class and Binary Classification Machine Learning Models in Identifying Strong Gravitational Lenses
Bottrell, Connor; Fabbro, Sebastien; Teimoorinia, Hossen +1 more
Typically, binary classification lens-finding schemes are used to discriminate between lens candidates and non-lenses. However, these models often suffer from substantial false-positive classifications. Such false positives frequently occur due to images containing objects such as crowded sources, galaxies with arms, and also images with a central…
HST/FGS Trigonometric Parallaxes of M-dwarf Eclipsing Binaries
Schaefer, Gail H.; Nelan, Edmund P.; Ciardi, David R. +5 more
Hubble Space Telescope (HST) Fine Guidance Sensor (FGS) trigonometric parallax observations were obtained to directly determine distances to five nearby M-dwarf/M-dwarf eclipsing binary systems. These systems are intrinsically interesting as benchmark systems for establishing basic physical parameters for low-mass stars, such as luminosity L, and …