Search Publications
Galactic Winds across the Gas-rich Merger Sequence. I. Highly Ionized N V and O VI Outflows in the QUEST Quasars
Maiolino, Roberto; Tripp, Todd M.; Hamann, Fred +12 more
This program is part of QUEST (Quasar/ULIRG Evolutionary Study) and seeks to examine the gaseous environments of z ≲ 0.3 quasars and ULIRGs as a function of host galaxy properties and age across the merger sequence from ULIRGs to quasars. This first paper in the series focuses on 33 quasars from the QUEST sample and on the kinematics of the highly…
ALMA Discovery of a Disk around the Planetary-mass Companion SR 12 c
Kraus, Adam L.; Bowler, Brendan P.; Zhu, Zhaohuan +6 more
We report an Atacama Large Millimeter/submillimeter Array 0.88 mm (Band 7) continuum detection of the accretion disk around SR 12 c, an ~11 M Jup planetary-mass companion (PMC) orbiting its host binary at 980 au. This is the first submillimeter detection of a circumplanetary disk around a wide PMC. The disk has a flux density of 127 ± 1…
An Assessment of the In Situ Growth of the Intracluster Light in the High-redshift Galaxy Cluster SpARCS1049+56
Muzzin, Adam; Yee, H. K. C.; Perlmutter, Saul +11 more
The formation of the stellar mass within galaxy cluster cores is a poorly understood process. It features the complicated physics of cooling flows, active galactic nucleus feedback, star formation, and more. Here we study the growth of the stellar mass in the vicinity of the brightest cluster galaxy (BCG) in a z = 1.7 cluster, SpARCS1049+56. We sy…
Hubble Space Telescope Imaging Reveals That SN 2015bh Is Much Fainter than Its Progenitor
Smith, Nathan; Strader, Jay; Sand, David J. +5 more
We present Hubble Space Telescope (HST) imaging of the site of SN 2015bh in the nearby spiral galaxy NGC 2770 taken between 2017 and 2019, nearly four years after the peak of the explosion. In 2017-2018, the transient fades steadily in optical filters before declining more slowly to F814W = -7.1 mag in 2019, ≈4 mag below the level of its eruptive …
An Exceptional Dimming Event for a Massive, Cool Supergiant in M51
Smith, Nathan; Strader, Jay; Sand, David J. +6 more
We present the discovery of an exceptional dimming event in a cool supergiant star in the Local Volume spiral M51. The star, dubbed M51-DS1, was found as part of a Hubble Space Telescope (HST) search for failed supernovae (SNe). The supergiant, which is plausibly associated with a very young (≲6 Myr) stellar population, showed clear variability (a…
A Systematic Exploration of Kilonova Candidates from Neutron Star Mergers during the Third Gravitational-wave Observing Run
Fong, W.; Sand, D. J.; Rastinejad, J. C. +9 more
We present a comprehensive analysis of 653 optical candidate counterparts reported during the third gravitational-wave (GW) observing run. Our sample concentrates on candidates from the 15 events (published in GWTC-2, GWTC-3, or not retracted on GraceDB) that had a >1% chance of including a neutron star in order to assess their viability as tru…
Coronal Mass Ejections and Type II Radio Emission Variability during a Magnetic Cycle on the Solar-type Star ϵ Eridani
Ó Fionnagáin, Dúalta; Kavanagh, Robert D.; Vidotto, Aline A. +5 more
We simulate possible stellar coronal mass ejection (CME) scenarios over the magnetic cycle of ϵ Eridani (18 Eridani; HD 22049). We use three separate epochs from 2008, 2011, and 2013, and estimate the radio emission frequencies associated with these events. These stellar eruptions have proven to be elusive, although a promising approach to detect …
Sh 2-301: A Blistered H II Region Undergoing Star Formation
Pandey, Rakesh; Sharma, Saurabh; Panwar, Neelam +6 more
We present a multiwavelength study of the H II region Sh 2-301 (S301) using deep optical data, near-infrared data, radio continuum data, and other archival data at longer wavelengths. A cluster of young stellar objects (YSOs) is identified in the northeast (NE) direction of S301. The Hα and radio continuum images trace the distribution of the ioni…
AT2020hur: A Possible Optical Counterpart of FRB 180916B
Dai, Zi-Gao; Li, Long; Li, Qiao-Chu +4 more
The physical origin of fast radio bursts (FRBs) remains unclear. Finding multiwavelength counterparts of FRBs can provide a breakthrough for understanding their nature. In this work, we perform a systematic search for astronomical transients whose positions are consistent with FRBs. We find an unclassified optical transient AT2020hur (α = 01h…
Extreme Nature of Four Blue-excess Dust-obscured Galaxies Revealed by Optical Spectroscopy
Ueda, Yoshihiro; Terashima, Yuichi; Matsuhara, Hideo +13 more
We report optical spectroscopic observations of four blue-excess dust-obscured galaxies (BluDOGs) identified by the Subaru Hyper Suprime-Cam. BluDOGs are a subclass of dust-obscured galaxies (DOGs; defined with the extremely red color (i - [22])AB ≥ 7.0; Toba et al., showing a significant flux excess in the optical g and r bands over th…