Search Publications
A New Probe of Line-of-sight Magnetic Field Tangling
Clark, S. E.
The Galactic neutral hydrogen (H I ) sky at high Galactic latitudes is suffused with linear structure. Particularly prominent in narrow spectral intervals, these linear H I features are well aligned with the plane-of-sky magnetic field orientation as measured with optical starlight polarization and polarized thermal dust emission. We analyze the c…
Constraints for the Progenitor Masses of Historic Core-collapse Supernovae
Dolphin, Andrew E.; Williams, Benjamin F.; Dalcanton, Julianne J. +3 more
We age-date the stellar populations associated with 12 historic nearby core-collapse supernovae (CCSNe) and two supernova impostors; from these ages, we infer their initial masses and associated uncertainties. To do this, we have obtained new Hubble Space Telescope imaging covering these CCSNe. Using these images, we measure resolved stellar photo…
On Cepheid Distance Scale Bias Due to Stellar Companions and Cluster Populations
Riess, Adam G.; Anderson, Richard I.
State-of-the-art photometric measurements of extragalactic Cepheids account for the mean additional light due to chance superposition of Cepheids on crowded backgrounds through the use of artificial star measurements. However, light from stars physically associated with Cepheids may bias relative distance measurements if the changing spatial resol…
The Molecular Gas Content and Fuel Efficiency of Starbursts at z ∼ 1.6 with ALMA
Daddi, E.; Rodighiero, G.; Béthermin, M. +17 more
We present an analysis of the molecular gas properties, based on CO (2-1) emission, of 12 starburst galaxies at z ∼ 1.6 selected by having a boost (≳4×) in their star formation rate (SFR) above the average star-forming galaxy at an equivalent stellar mass. ALMA observations are acquired of six more galaxies than previously reported through our eff…
ALMA Detection of Extended Millimeter Halos in the HD 32297 and HD 61005 Debris Disks
MacGregor, Meredith A.; Weinberger, Alycia J.; Hughes, A. Meredith +7 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) 1.3 mm (230 GHz) observations of the HD 32297 and HD 61005 debris disks, two of the most iconic debris disks because of their dramatic swept-back wings seen in scattered light images. These observations achieve sensitivities of 14 and 13 µJy beam-1 for HD 32297 and HD …
Dissection of the Collisional and Collisionless Mass Components in a Mini Sample of CLASH and HFF Massive Galaxy Clusters at z ≈ 0.4
Grillo, C.; Balestra, I.; Rosati, P. +7 more
We present a multiwavelength study of the massive ({M}200{{c}}≈ (1{--}2)× {10}15{M}⊙ ) galaxy clusters RXC J2248.7-4431, MACS J0416.1-2403, and MACS J1206.2-0847 at z ≈ 0.4. Using the X-ray surface brightness of the clusters from the deep Chandra data to model their hot gas, we are able to disentangle this mass ter…
On the Faint End of the Galaxy Luminosity Function in the Epoch of Reionization: Updated Constraints from the HST Frontier Fields
Castellano, M.; Di Criscienzo, M.; Santini, P. +12 more
Ultra-faint galaxies are hosted by small dark matter halos with shallow gravitational potential wells, hence their star formation activity is more sensitive to feedback effects. The shape of the faint end of the high-z galaxy luminosity function (LF) contains important information on star formation and its interaction with the reionization process…
The Carnegie-Irvine Galaxy Survey. VI. Quantifying Spiral Structure
Ho, Luis C.; Barth, Aaron J.; Yu, Si-Yue +1 more
The Carnegie-Irvine Galaxy Survey provides high-quality broadband optical images of a large sample of nearby galaxies for detailed study of their structure. To probe the physical nature and possible cosmological evolution of spiral arms, a common feature of many disk galaxies, it is important to quantify their main characteristics. We describe rob…
The Peculiar Radial Distribution of Multiple Populations in the Massive Globular Cluster M80
Dalessandro, E.; Salaris, M.; Vesperini, E. +7 more
We present a detailed analysis of the radial distribution of light-element multiple populations (LE-MPs) in the massive and dense globular cluster M80, based on a combination of UV and optical Hubble Space Telescope data. Surprisingly, we find that first-generation (FG) stars (FG) are significantly more centrally concentrated than extreme second-g…
Astrometric Limits on the Stochastic Gravitational Wave Background
Darling, Jeremy; Truebenbach, Alexandra E.; Paine, Jennie
The canonical methods for gravitational wave detection are ground- and space-based laser interferometry, pulsar timing, and polarization of the cosmic microwave background. But as has been suggested by numerous investigators, astrometry offers an additional path to gravitational wave detection. Gravitational waves deflect light rays of extragalact…