53 citations · 161 across the 20 of their papers we have counts for
21 papers
SDSS-IV MaStar: Determination of Stellar Parameters Using Bayesian Averaging
Yan-Ping Chen, Renbin Yan, Szabolcs Mészáros +12
We present the stellar parameters for 59,266 high-quality spectra of 24,130 unique stars from the MaNGA Stellar Library (MaStar) in the Sloan Digital Sky Survey (SDSS) Data Release…
EMU discovery of Thunder: a bow-shock PWN powered by PSR J1631-4722 escaping Nimbus SNR (G336.7+0.5)
S. Lazarević, C. Maitra, A. Ahmad +21
We report the discovery of a bow-shock pulsar wind nebula (PWN), dubbed Thunder, powered by the radio pulsar PSR J1631-4722 and projected within the Galactic supernova remnant (SNR…
A Multiwavelength Interpretation of HESS J1857+026 Emission Using the Fermi-LAT, VERITAS, and HAWC Observatories
Jordan Eagle, Yu Chen, Ramiro Torres-Escobedo +2
We present a new study on the MeV-TeV gamma-ray origin of HESS J1857+026 using data collected from the Fermi-LAT, VERITAS, and HAWC observatories. A spatial and spectral study of H…
HI Observations of Giant Low Surface Brightness Galaxies
Philip Lah, Nikhil Arora, Ivan Yu. Katko +5
Giant low surface brightness galaxies (gLSBs) are galaxies with extremely extended, faint, optical disks over 50 kpc in radius and have high total masses which can reach 10^12 sola…
Danger Zone: Establishing Buffers for Enhanced Classification in BPT Diagrams
Changhyun Cho, Ahmad Nemer, Ivan Yu. Katkov +1
This study utilizes unsupervised machine learning, specifically the uniform manifold approximation and projection (UMAP) algorithm, to classify optical spectra originating from sta…
Low-energy Radio Bursts from Magnetar XTE J1810197: Implications for Fast Radio Bursts
Banshi Lal, Yogesh Maan, Moaz Abdelmaguid +3
Magnetars are the leading candidate sources of fast radio bursts (FRBs). However, the observational probes of the connections between magnetars and FRBs are severely limited by the…
Evidence of an Energetic Magnetar Powering 1LHAASO J05004454
J. A. J. Alford, J. D. Gelfand, M. Abdelmaguid +1
We investigate the origin of unidentified, extended TeV source 1LHAASO J05004454, considering three possible origins: cosmic rays interacting with a molecular cloud (MC), partic…
The Timing Evolution of the Magnetar Swift J1818.0-1607 During a Period of Reduced Activity
Moaz Abdelmaguid, Paulo C. C. Freire, Joseph D. Gelfand +3
We report results from an observational campaign of the radio-loud magnetar Swift J1818.0-1607 using the Green Bank Telescope (GBT) at 2.0 GHz, which began in November 2021 during…
NuSTAR and XMM-Newton Observations of PSR J1930+1852 and Its Pulsar Wind Nebula
J. A. J. Alford, G. -B. Zhang, J. D. Gelfand
Synchrotron X-ray emission from a pulsar wind nebula (PWN) is a sensitive probe of its magnetic field and high-energy particle population. Here we analyze contemporaneous NuSTAR an…
ZTF IC 10 variable catalog
Zehao Jin, Joseph D. Gelfand
To study how massive variable stars effect their environment, we search for variability among Zwicky Transient Facility (ZTF) sources located within the optical extent of a nearby…
Stellar CoRGI in MaNGA: Stellar Counterrotating Galaxies Identified in the MaNGA Survey
Damir Gasymov, Ivan Yu. Katkov, Evgenii V. Rubtsov +8
Stellar counterrotating (CR) galaxies are systems hosting two large-scale stellar components rotating in opposite directions -- a main, preexisting galaxy body with an older stella…
Emission Line Velocity, Metallicity and Extinction Maps of the Small Magellanic Cloud
Philip Lah, Matthew Colless, Francesco D'Eugenio +2
Optical emission lines across the Small Magellanic Cloud (SMC) have been measured from multiple fields using the Australian National University (ANU) 2.3m telescope with the Wide-F…
A closer look at the origin of LINER emission and its connection to evolved stars with a machine learning classification scheme
Ahmad Nemer, Ivan Katkov, Jospeh Gelfand +1
Identifying the dominant ionizing sources in galaxies is essential for understanding their formation and evolution. Traditionally, spectra are classified based on their dominant io…
A dichotomy in the 1-24 GHz parsec-scale radio spectra of radio-quiet quasars
Sina Chen, Ari Laor, Ehud Behar +3
We present the pc-scale radio spectra of a representative sample of 13 Palomar-Green radio-quiet quasars, based on our new Very Long Baseline Array (VLBA) observations at 8.4 and 2…
Windy or not: Radio pc-scale evidence for a broad-line region wind in radio-quiet quasars
Sina Chen, Ari Laor, Ehud Behar +6
Does a broad-line region (BLR) wind in radio-quiet (RQ) active galactic nuclei (AGN) extend to pc scales and produce radio emission? We explore the correlations between a pc-scale…
Emission Line Velocity, Metallicity and Extinction Maps of the Large Magellanic Cloud
Philip Lah, Matthew Colless, Francesco D'Eugenio +2
We measure the properties of optical emission lines in multiple locations across the Large Magellanic Cloud (LMC) using the Australian National University 2.3-metre telescope and t…
X-ray Spectroscopy of the Highly Magnetized Pulsar PSR J1846-0258, its Wind Nebula and Hosting Supernova Remnant Kes 75
E. V. Gotthelf, S. Safi-Harb, S. M. Straal +1
We present broad-band X-ray spectroscopy of the energetic components that make up the supernova remnant (SNR) Kesteven 75 using concurrent 2017 Aug 17-20 XMM-Newton and NuSTAR obse…
Up and Down the Black Hole Radio/X-ray Correlation: the 2017 mini-outbursts from Swift J1753.5-0127
R. M. Plotkin, J. Bright, J. C. A. Miller-Jones +20
The candidate black hole X-ray binary Swift J1753.5-0127 faded to quiescence in 2016 November, after a prolonged outburst that was discovered in 2005. Nearly three months later the…
SDSS IV MaNGA: Discovery of an blob associated with a dry galaxy pair -- ejected gas or a `dark' galaxy candidate?
Lihwai Lin, Jing-Hua Lin, Chin-Hao Hsu +31
We report the discovery of a mysterious giant blob that is kpc away from the main MaNGA target 1-24145, one component of a dry galaxy merger, identified in the first…
NuSTAR Discovery of a Young, Energetic Pulsar Associated with the Luminous Gamma-ray Source HESS J1640-465
E. V. Gotthelf, J. A. Tomsick, J. P. Halpern +9
We report the discovery of a 206 ms pulsar associated with the TeV gamma-ray source HESS J1640-465 using the Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray observatory. PSR J…
A Chandra Observation of Supernova Remnant G350.1-0.3 and Its Central Compact Object
Igor Lovchinsky, Patrick Slane, Bryan Gaensler +5
We present a new Chandra observation of supernova remnant (SNR) G350.1-0.3. The high resolution X-ray data reveal previously unresolved filamentary structures and allow us to perfo…