Search Publications
Molecular Gas in the Nuclear Region of NGC 6240
Bally, John; Glenn, Jason; Rangwala, Naseem +3 more
NGC 6240 is a luminous infrared galaxy in the local universe in the midst of a major merger. We analyze high-resolution interferometric observations of warm molecular gas using CO J = 3-2 and 6-5 in the central few kpc of NGC 6240 taken by the Atacama Large Millimeter Array. Using these CO line observations, we model the density distribution and k…
Small-scale Bright Blobs Ejected from a Sunspot Light Bridge
Hou, Yijun; Chen, Yajie; Song, Yongliang +3 more
Light bridges (LBs) are bright lanes that divide an umbra into multiple parts in some sunspots. Persistent oscillatory bright fronts at a temperature of ∼105 K are commonly observed above LBs in the 1400/1330 Špassbands of the Interface Region Imaging Spectrograph (IRIS). Based on IRIS observations, we report small-scale bright blobs ej…
Spatial Distribution of O VI Covering Fractions in the Simulated Circumgalactic Medium
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +6 more
We use adaptive mesh refinement cosmological simulations to study the spatial distribution and covering fraction of ${\rm{O}}\,{\rm\small{VI}}$ absorption in the circumgalactic medium (CGM) as a function of projected virial radius and azimuthal angle. We compare these simulations to an observed sample of 53 galaxies from the Multiphase Galaxy Halo…
Extremely Low Molecular Gas Content in the Vicinity of a Red Nugget Galaxy at z = 1.91
Stiavelli, M.; Lucas, R. A.; D'Amato, Q. +3 more
We present Atacama Large Millimeter/submillimeter Array Band 5 observations of a galaxy at z = 1.91, GDS24569, in search of molecular gas in its vicinity via the [C I] 3P1-3P0 line. GDS24569 is a massive ( $\mathrm{log}{M}_{* }/{M}_{\odot }=11$ ), passively evolving galaxy, characterized by compact morph…
Physical Characterization of Serendipitously Uncovered Millimeter-wave Line-emitting Galaxies at z 2.5 behind the Local Luminous Infrared Galaxy VV 114
Tamura, Yoichi; Kohno, Kotaro; Yun, Min S. +11 more
We present a detailed investigation of millimeter-wave line emitters ALMA J010748.3-173028 (ALMA-J0107a) and ALMA J010747.0-173010 (ALMA-J0107b), which were serendipitously uncovered in the background of the nearby galaxy VV 114 with spectral scan observations at λ = 2-3 mm. Via Atacama Large Millimeter/submillimeter Array (ALMA) detection of CO(4…
ALMA Observations of the Inner Cavity in the Protoplanetary Disk around Sz 84
Dong, Ruobing; Tamura, Motohide; Takami, Michihiro +5 more
We present Atacama Large Millimeter/submillimeter Array observations of a protoplanetary disk around the T Tauri star Sz 84 and analyses of the structures of the inner cavity in the central region of the dust disk. Sz 84's spectral energy distribution (SED) has been known to exhibit negligible infrared excess at λ ≲ 10 µm due to the disk's c…
The Role of Dust, UV Luminosity and Large-scale Environment on the Escape of Lyα Photons: A Case Study of a Protocluster Field at z = 3.1
Dey, Arjun; Lee, Kyoung-Soo; Huang, Yun +3 more
We present a detailed characterization of the Lyα properties for 93 Lyα emitters (LAEs) at z ~ 3.1 selected from the D1 field of the Canada-France-Hawaii Telescope Legacy Survey, including 24 members of a massive protocluster. The median-stacked Lyα image shows an extended Lyα halo (LAH) surrounding the galaxy with the exponential scale length 4.9…
Observational Kinematic Characteristics of Blobs in Solar Coronal Helmet and Pseudo Streamers
Kumar, Pankaj; Cho, Kyung-Suk; Kim, Yeon-Han +4 more
We examine two helmet and two pseudo streamers (HSs and PSs) observed on 2018 and 2019. The HSs (PSs) have dark coronal cavities and stretched loop structures (twin coronal cavities and narrow plasma sheet) at their bases, which are well observed in K-Coronagraph (K-Cor). Their outer-corona structures (top of core, cusp, and stalk) are also clearl…
The Highly Self-absorbed Blazar PKS 1351-018
Frey, Sándor; Chen, Sina; Punsly, Brian +5 more
PKS 1351-018 at a redshift of z = 3.71 is one of the most luminous, steady synchrotron sources with a luminosity >1047 erg s-1. The synchrotron luminosity does not seem to have varied by more than ~25% over 35 yr. In order to appreciate this remarkable behavior, if it were at z = 0.5, it would have a flux density at 15 GHz…
AT 2019qyl in NGC 300: Internal Collisions in the Early Outflow from a Very Fast Nova in a Symbiotic Binary
Boyer, Martha L.; Kilpatrick, Charles D.; Coulter, David A. +39 more
Nova eruptions, thermonuclear explosions on the surfaces of white dwarfs (WDs), are now recognized to be among the most common shock-powered astrophysical transients. We present the early discovery and rapid ultraviolet (UV), optical, and infrared (IR) temporal development of AT 2019qyl, a recent nova in the nearby Sculptor Group galaxy NGC 300. T…