Search Publications
The HOSTS Survey: Evidence for an Extended Dust Disk and Constraints on the Presence of Giant Planets in the Habitable Zone of β Leo
Absil, O.; Bryden, G.; Ertel, S. +38 more
The young (50-400 Myr) A3V star β Leo is a primary target to study the formation history and evolution of extrasolar planetary systems as one of the few stars with known hot (∼1600 K), warm (∼600 K), and cold (∼120 K) dust belt components. In this paper, we present deep mid-infrared measurements of the warm dust brightness obtained with the Large …
Where Do Obscured AGN Fit in a Galaxy's Timeline?
Giavalisco, Mauro; Kirkpatrick, Allison; Ji, Zhiyuan +7 more
Many X-ray bright active galactic nuclei (AGNs) are predicted to follow an extended stage of obscured black hole growth. In support of this picture we examine the X-ray undetected AGNs in the COSMOS field and compare their host galaxies with X-ray bright AGNs. We examine galaxies with M* > 109.5 M⊙ for the prese…
Measuring Young Stars in Space and Time. II. The Pre-main-sequence Stellar Content of N44
Gennaro, Mario; Dolphin, Andrew E.; Klessen, Ralf S. +9 more
The Hubble Space Telescope survey Measuring Young Stars in Space and Time (MYSST) entails some of the deepest photometric observations of extragalactic star formation, capturing even the lowest-mass stars of the active star-forming complex N44 in the Large Magellanic Cloud. We employ the new MYSST stellar catalog to identify and characterize the c…
Herschel Photometric Observations of LITTLE THINGS Dwarf Galaxies
Madden, Suzanne C.; Gomez, Haley L.; Brinks, Elias +6 more
We present here far-infrared photometry of galaxies in a sample that is relatively unexplored at these wavelengths: low-metallicity dwarf galaxies with moderate star formation rates. Four dwarf irregular galaxies from the LITTLE THINGS survey are considered, with deep Herschel PACS and SPIRE observations at 100, 160, 250, 350, and 500 µm. Re…
Discovery of 22 GHz Water Masers in the Serpens South Region
Gong, Yan; Pillai, Thushara; Loinard, Laurent +5 more
Using the Karl G. Jansky Very Large Array (VLA), we have conducted a survey for 22 GHz, 61,6-52,3 H2O masers toward the Serpens South region. The masers were also observed with the Very Long Baseline Array following the VLA detections. We detect for the first time H2O masers in the Serpens South region t…
SOFIA upGREAT/FIFI-LS Emission-line Observations of Betelgeuse during the Great Dimming of 2019/2020
Harper, Graham M.; Guinan, Edward F.; Fadda, Dario +12 more
We report NASA-DLR SOFIA upGREAT circumstellar [O I] 63.2 µm and [C II] 157.7 µm emission profiles and FIFI-LS [O I] 63.2 µm, [O I] 145.5 µm, and [C II] 157.7 µm fluxes obtained shortly after Betelgeuse's 2019/2020 Great Dimming event. Haas et al. noted a potential correlation between the [O I] 63.2 µm flux and …
The Stellar Content of H72.97-69.39, a Potential Super Star Cluster in the Making
Hirschauer, Alec S.; Meixner, Margaret; Zinnecker, Hans +2 more
Young massive clusters and super star clusters (SSCs) represent an extreme mode of star formation. Far-infrared imaging of the Magellanic Clouds has identified one potential embedded SSC, HSO BMHERICC J72.971176-69.391112 (H72.97-69.39 in short), in the southwest outskirts of the Large Magellanic Cloud. We present Gemini Flamingos 2 and GSAOI near…
Runaway Stars as Possible Sources of the Elliptical Ring Structures in NGC 7538
Fenske, Josephine; Arakawa, Jason; Fallscheer, Cassandra +1 more
Two large, ∼500 M⊙ elliptical ring structures have been identified in the high-mass star-forming region NGC 7538. The origin of these ring structures is unknown, so we investigate the possibility that a runaway O- or B-type star may have originated in or passed through the region and created either or both of the ring structures via ste…
Investigating the Physical Properties and Fragmentation of the AFGL 333-Ridge
Wang, Jun-Jie; Xu, Jin-Long; Liang, Xiaolian
We present multiwavelength data to investigate the physical properties and fragmentation of AFGL 333-Ridge. A statistical analysis of velocity dispersion indicates that turbulence is the dominant motion in the ridge. However, the linear mass density (1124.0 M ⊙/pc) of AFGL 333-Ridge far exceeds its critical value of 406.5 M ⊙…