Search Publications
The Spatially Resolved Dust-to-metals Ratio in M101
Sandstrom, Karin M.; Johnson, L. Clifton; Leroy, Adam K. +3 more
The dust-to-metals ratio describes the fraction of heavy elements contained in dust grains, and its variation provides key insights into the life cycle of dust. We measure the dust-to-metals ratio in M101, a nearby galaxy with a radial metallicity (Z) gradient spanning ∼1 dex. We fit the spectral energy distribution of dust from 100 to 500 µ…
The Changing-look Quasar Mrk 590 Is Awakening
Vestergaard, M.; Peterson, B. M.; Goad, M. +9 more
Mrk 590 was originally classified as a Seyfert 1 galaxy, but then it underwent dramatic changes: the nuclear luminosity dropped by over two orders of magnitude and the broad emission lines all but disappeared from the optical spectrum. Here we present follow-up observations to the original discovery and characterization of this “changing-look” act…
The Excited Spin State of 1I/2017 U1 ‘Oumuamua
Wainscoat, Richard J.; Weaver, Harold A.; Buie, Marc W. +15 more
We show that ‘Oumuamua’s excited spin could be in a high-energy long axis mode (LAM) state, which implies that its shape could be far from the highly elongated shape found in previous studies. CLEAN and ANOVA algorithms are used to analyze ‘Oumuamua’s lightcurve using 818 observations over 29.3 days. Two fundamental periodicities are found at freq…
Near-infrared High-resolution Imaging Polarimetry of FU Ori-type Objects: Toward a Unified Scheme for Low-mass Protostellar Evolution
Henning, Thomas; Fu, Guangwei; Dong, Ruobing +14 more
We present near-IR imaging polarimetry of five classical FU Ori-type objects (FU Ori, V1057 Cyg, V1515 Cyg, V1735 Cyg, Z CMa) with an ∼0.″1 resolution observed using HiCIAO+AO188 at the Subaru Telescope. We observed scattered light associated with circumstellar dust around four of them (i.e., all but V1515 Cyg). Their polarized intensity distribut…
Homologous Large-amplitude Nonlinear Fast-mode Magnetosonic Waves Driven by Recurrent Coronal Jets
Liu, Yu; Liu, Ying D.; Shen, Yuandeng +3 more
The detailed observational analysis of a homologous extreme-ultraviolet (EUV) wave event is presented to study the driving mechanism and the physical property of the EUV waves, combining high-resolution data taken by the Solar Dynamics Observatory and the Solar TErrestrial RElations Observatory. It is observed that four homologous EUV waves origin…
First Observations of the Magnetic Field inside the Pillars of Creation: Results from the BISTRO Survey
Pattle, Kate; Ward-Thompson, Derek; Berry, David +7 more
We present the first high-resolution, submillimeter-wavelength polarimetric observations of—and thus direct observations of the magnetic field morphology within—the dense gas of the Pillars of Creation in M16. These 850 µm observations, taken as part of the B-Fields in Star-forming Region Observations Survey (BISTRO) using the POL-2 polarime…
The Strong Rotation of M5 (NGC 5904) as Seen from the MIKiS Survey of Galactic Globular Clusters
Dalessandro, E.; Valenti, E.; Bellazzini, M. +10 more
In the context of the ESO-VLT Multi-Instrument Kinematic Survey (MIKiS) of Galactic globular clusters (GGCs), we present the line-of-sight rotation curve and velocity dispersion profile of M5 (NGC 5904), as determined from the radial velocity of more than 800 individual stars observed out to 700″ (∼5 half-mass radii) from the center. We found one …
Ultraviolet Detection of the Binary Companion to the Type IIb SN 2001ig
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Ryder, Stuart D. +8 more
We present HST/WFC3 ultraviolet imaging in the F275W and F336W bands of the Type IIb SN 2001ig at an age of more than 14 years. A clear point source is detected at the site of the explosion, with m F275W = 25.39 ± 0.10 and m F336W = 25.88 ± 0.13 mag. Despite weak constraints on both the distance to the host galaxy NGC 7424 an…
High-redshift Extremely Red Quasars in X-Rays
Pâris, Isabelle; Strauss, Michael A.; Brandt, William N. +11 more
Quasars may have played a key role in limiting the stellar mass of massive galaxies. Identifying those quasars in the process of removing star formation fuel from their hosts is an exciting ongoing challenge in extragalactic astronomy. In this paper, we present X-ray observations of 11 extremely red quasars (ERQs) with L bol ∼ 1047…
The Low-luminosity Type IIP Supernova 2016bkv with Early-phase Circumstellar Interaction
Tominaga, Nozomu; Itoh, Ryosuke; Takaki, Katsutoshi +22 more
We present optical and near-infrared observations of a low-luminosity (LL) Type IIP supernova (SN) 2016bkv from the initial rising phase to the plateau phase. Our observations show that the end of the plateau is extended to ≳140 days since the explosion, indicating that this SN takes one of the longest times to finish the plateau phase among Type …