Search Publications
First Detection of CO Isotopologues in a High-redshift Main-sequence Galaxy: Evidence of a Top-heavy Stellar Initial Mass Function
Fu, Xiaoting; Ivison, R. J.; Zhang, Zhi-Yu +5 more
Recent observations and theories have presented a strong challenge to the universality of the stellar initial mass function (IMF) in extreme environments. A notable example has been found for starburst conditions, where evidence favors a top-heavy IMF, i.e., there is a bias toward massive stars compared to the IMF that is responsible for the stell…
The ALMA View of Positive Black Hole Feedback in the Dwarf Galaxy Henize 2–10
Reines, Amy E.; Gim, Hansung B.
Henize 2–10 is a dwarf starburst galaxy hosting a ∼106 M ⊙ black hole (BH) that is driving an ionized outflow and triggering star formation within the central ∼100 pc of the galaxy. Here, we present Atacama Large Millimeter/submillimeter Array continuum observations from 99 to 340 GHz, as well as spectral line observations of…
Prominent Mid-infrared Excess of the Dwarf Planet (136472) Makemake Discovered by JWST/MIRI Indicates Ongoing Activity
Pál, András; Lellouch, Emmanuel; Moór, Attila +18 more
We report on the discovery of a very prominent mid-infrared (18–25 µm) excess associated with the trans-Neptunian dwarf planet (136472) Makemake. The excess, detected by the Mid-Infrared Instrument of the James Webb Space Telescope, along with previous measurements from the Spitzer and Herschel space telescopes, indicates the occurrence of t…
A Numerical Study of the Effects of a Corotating Interaction Region on Cosmic-Ray Transport. II. Features of Cosmic-Ray Composition and Rigidity
Luo, Xi; Shen, Fang; Zhang, Ming +1 more
We continue the numerical modeling of a corotating interaction region (CIR) and the effects it has on solar-rotational recurrent variations of galactic cosmic rays (GCRs). A magnetohydrodynamic model is adapted to simulate the background solar wind plasma with a CIR structure in the inner heliosphere, which is incorporated into a comprehensive Par…
CHAOS. VIII. Far-ultraviolet Spectra of M101 and the Impact of Wolf–Rayet Stars
Skillman, Evan D.; Chisholm, John; Erb, Dawn K. +8 more
We investigate the stellar and nebular properties of nine H II regions in the spiral galaxy M101 with far-ultraviolet (FUV; ∼900–2000 Å) and optical (∼3200–10,000 Å) spectra. We detect significant C III] λλ1907,1909 nebular emission in seven regions, but O III] λ1666 only in the lowest-metallicity region. We produce new analytic functions of the c…
The High-mass X-Ray Binary Luminosity Functions of Dwarf Galaxies
Greene, Jenny E.; Goulding, Andy D.; Lehmer, Bret D. +2 more
Drawing from the Chandra archive and using a carefully selected set of nearby dwarf galaxies, we present a calibrated high-mass X-ray binary (HMXB) luminosity function in the low-mass galaxy regime and search for an already hinted at dependence on metallicity. Our study introduces a new sample of local dwarf galaxies (D < 12.5 Mpc and M *<…
Predicting the Arrival Time of an Interplanetary Shock Based on DSRT Spectrum Observations for the Corresponding Type II Radio Burst and a Blast Wave Theory
Feng, Shiwei; Ruan, Mengsi; Li, Ran +7 more
Since fast head-on coronal mass ejections and their associated shocks represent potential hazards to the space environment of the Earth and even other planets, forecasting the arrival time of the corresponding interplanetary shock is a priority in space weather research and prediction. Based on the radio spectrum observations of the 16-element arr…
The Empirical and Radiative Transfer Hybrid (EaRTH) Disk Model: Merging Analyses of Protoplanetary Dust Disk Mineralogy and Structure
Stassun, Keivan G.; Pinte, Christophe; Principe, David A. +7 more
Our understanding of how exoplanets form and evolve relies on analyses of both the mineralogy of protoplanetary disks and their detailed structures; however, these key complementary aspects of disks are usually studied separately. We present initial results from a hybrid model that combines the empirical characterization of the mineralogy of a dis…
The Age Distribution of Stellar Orbit Space Clumps
Rix, Hans-Walter; Fürnkranz, Verena; Coronado, Johanna +1 more
The orbit distribution of young stars in the Galactic disk is highly structured, from well-defined clusters to streams of stars that may be widely dispersed across the sky, but are compact in orbital action-angle space. The age distribution of such groups can constrain the timescales over which conatal groups of stars disperse into the "field." Ga…
Detection of Extragalactic Anomalous Microwave Emission in NGC 2903 Using KVN Single-dish Observations
Tsai, Chao-Wei; Hoang, Thiem; Nakanishi, Hiroyuki +4 more
We present the results of the single-dish observations using the Korean VLBI Network to search for anomalous microwave emission (AME) in nearby galaxies. The targets were selected from 'Mapping the dense molecular gas in the strongest star-forming galaxies' (MALATANG), a legacy survey project of the James Clerk Maxwell Telescope. The MALATANG gala…