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The GOGREEN Survey: Evidence of an Excess of Quiescent Disks in Clusters at 1.0
Cooper, M. C.; Muzzin, Adam; Forrest, Ben +21 more
We present the results of the measured shapes of 832 galaxies in 11 galaxy clusters at 1.0 < z < 1.4 from the GOGREEN survey. We measure the axis ratio (q), the ratio of the minor to the major axis, of the cluster galaxies from near-infrared Hubble Space Telescope imaging using Sérsic profile fitting and compare them with a field sample. We …
Constraints on planets in nearby young moving groups detectable by high-contrast imaging and Gaia astrometry
Federrath, C.; Ireland, M. J.; Wallace, A. L.
The formation of giant planets can be studied through direct imaging by observing planets both during and after formation. Giant planets are expected to form either by core accretion, which is typically associated with low initial entropy (cold-start models) or by gravitational instability, associated with high initial entropy of the gas (hot-star…
Measuring Stellar Masses of Emission-line Galaxies at 1.2 < z < 1.9
Yang, Guang; Gronwall, Caryl; Ciardullo, Robin +4 more
The accurate measurement of stellar masses over a wide range of galaxy properties is essential for better constraining models of galaxy evolution. Emission-line galaxies (ELGs) tend to have better redshift estimates than continuum-selected objects, and have been shown to span a large range of physical properties, including stellar mass. Using data…
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…
Sparse Box-fitting Least Squares
Zucker, Shay; Panahi, Aviad
We present a new implementation of the commonly used Box-fitting Least Squares (BLS) algorithm, for the detection of transiting exoplanets in photometric data. Unlike BLS, our new implementation—Sparse BLS, does not use binning of the data into phase bins, nor does it use any kind of phase grid. Thus, its detection efficiency does not depend on th…
The magnetic field in the dense photodissociation region of DR 21
Menten, Karl M.; Jacob, Arshia M.; Pillai, Thushara G. S. +3 more
Measuring interstellar magnetic fields is extremely important for understanding their role in different evolutionary stages of interstellar clouds and star formation. However, detecting the weak field is observationally challenging. We present measurements of the Zeeman effect in the 1665 and 1667 MHz (18 cm) lines of the hydroxyl radical (OH) lin…
Using VIRTIS on Venus Express to Constrain the Properties of the Giant Dark Cloud Observed in Images of Venus by IR2 on Akatsuki
Tsang, Constantine C. C.; Barstow, Joanna K.; McGouldrick, Kevin +1 more
A cloud opacity contrast feature that has been called a "long-lived sharp disruption" has been seen in the atmosphere of Venus in the near-infrared using Akatsuki's IR2 camera, most clearly at equatorial latitudes. This feature was found to have a consistent planet-circling period of 4.9 days, and subsequent searches of past imagery revealed that …
Azimuthal propagation of star formation in nearby spiral galaxies: NGC 628, NGC 3726, and NGC 6946
Gusev, A. S.; Sakhibov, F.; Hemmerich, C.
Star formation induced by a spiral shock wave, which in turn is generated by a spiral density wave, produces an azimuthal age gradient across the spiral arm, which has opposite signs on either side of the corotational resonance. An analysis of the spatial separation between young star clusters and nearby H II regions has made it possible to determ…
Discovery of extremely low-metallicity circumgalactic gas at z = 0.5 towards Q0454-220
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +3 more
We have obtained new observations of the absorption system at zabs = 0.48 towards QSO Q0454-220, which we use to constrain its chemical and physical conditions. The system features metal-enriched gas and previously unknown low-metallicity gas detected ${\sim} 200 \, \mathrm{km \, s^{-1}}$ blueward of the metal-enriched gas. The low-meta…
A low-frequency radio halo survey of the South Pole Telescope SZ-selected clusters with the GMRT
Rahaman, Majidul; Raja, Ramij; Datta, Abhirup +3 more
The presence of non-thermal electrons and large-scale magnetic fields in the intracluster medium is known through the detection of megaparsec (Mpc) scale diffuse radio synchrotron emission. Although a significant amount of progress in finding new diffuse radio sources has happened in the last decade, most of the investigation has been constrained …