T. P. Ellsworth-Bowers
A5001980471- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Astronomical Observations and Instrumentation
- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Molecular Spectroscopy and Structure
- Laser Design and Applications
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Dark Matter and Cosmic Phenomena
- Advanced Frequency and Time Standards
- Scientific Measurement and Uncertainty Evaluation
- Astrophysical Phenomena and Observations
- Cosmology and Gravitation Theories
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Atmospheric and Environmental Gas Dynamics
- Advanced Combustion Engine Technologies
- Plant and animal studies
Lowell Observatory
2022-2024
University of Gothenburg
2016
University of Colorado Boulder
2010-2015
We present a re-reduction and expansion of the Bolocam Galactic Plane Survey, first presented by Aguirre et al. (2011) Rosolowsky (2010). The BGPS is 1.1 mm survey dust emission in Northern galactic plane, covering longitudes -10 < \ell 90 latitudes |b| 0.5 with typical 1-\sigma RMS sensitivity 30-100 mJy 33" beam. Version 2 includes an additional 20 square degrees coverage 3rd 4th quadrants 1st quadrant. new data release has improved angular recovery, complete recovery out to 80" partial...
We present a method for selecting $z>4$ dusty, star forming galaxies (DSFGs) using Herschel/SPIRE 250/350/500 $\mu m$ flux densities to search red sources. apply this 21 deg$^2$ of data from the HerMES survey produce catalog 38 high-$z$ candidates. Follow-up first 5 these sources confirms that is efficient at DSFGs, with 4/5 $z=4.3$ $6.3$ (and remaining source $z=3.4$), and they are some most luminous dusty known. Comparison previous DSFG samples, mostly selected longer wavelengths (e.g.,...
ABSTRACT We report the discovery of a bright ( f (250 μm)>400 mJy), multiply lensed submillimeter galaxy HERMES J105751.1+573027 in Herschel /SPIRE Science Demonstration Phase data from HerMES project. Interferometric 880 μm Submillimeter Array observations resolve at least four images with large separation ∼9″. A high-resolution adaptive optics K p image Keck/NIRC2 clearly shows strong lensing arcs. Follow-up spectroscopy gives redshift z = 2.9575, and model total magnification μ ∼ 11 ±...
Dusty, star forming galaxies contribute to a bright, currently unresolved cosmic far-infrared background. Deep Herschel-SPIRE images designed detect and characterize the that comprise this background are highly confused, such bulk lies below classical confusion limit. We analyze three fields from HerMES programme in all SPIRE bands (250, 350, 500 microns); parameterized galaxy number count models derived depth of ~2 mJy/beam, approximately 4 times previous analyses at these wavelengths,...
We present the results of observations 1882 sources in Bolocam Galactic Plane Survey (BGPS) at 1.1 mm with 10m Heinrich Hertz Telescope simultaneously HCO+ J=3-2 and N2H+ J=3-2. detect 77% these HCO^+ 51% greater than 3$\sigma$. find a strong correlation between integrated intensity both dense gas tracers dust emission BGPS sources. determine kinematic distances for 529 (440 first quadrant breaking distance ambiguity 89 second quadrant) derive size, mass, average density this subset clumps....
The Bolocam Galactic Plane Survey (BGPS) is a 1.1 mm continuum survey of dense clumps dust throughout the Galaxy covering 170 square degrees. We present spectroscopic observations using Heinrich Hertz Submillimeter Telescope gas tracers, HCO+ and N2H+ 3-2, for all 6194 sources in v1.0.1 catalog between 7.5 <= l 194 This largest targeted molecular Milky Way to date. find unique velocities 3126 (50.5%) BGPS observed. Strong 3-2 emission (T_{mb} > 0.5 K) without does not occur this catalog....
We present an expanded distance catalog for 1,710 molecular cloud structures identified in the Bolocam Galactic Plane Survey (BGPS) version 2, representing a nearly threefold increase over previous BGPS catalog. additionally new method incorporating extant data sets into our Bayesian probability density function (DPDF) methodology. To augment dense-gas tracers (e.g., HCO+(3-2), NH3(1,1)) used to derive line-of-sight velocities kinematic distances, we utilize Ring 13CO(1-0) morphologically...
ABSTRACT We sort 4683 molecular clouds between 10° < ℓ 65° from the Bolocam Galactic Plane Survey based on observational diagnostics of star formation activity: compact 70 μ m sources, mid-IR color-selected YSOs, H 2 O and CH 3 OH masers, UCH ii regions. also present a combined NH -derived gas kinetic temperature maser catalog for 1788 clumps our own GBT 100 observations literature. identify subsample 2223 (47.5%) starless clump candidates (SCCs), largest most robust sample identified...
Abstract A wealth of observations have long suggested that the vast majority isolated classical dwarf galaxies ( M * = 10 7 –10 9 ⊙ ) are currently star forming. However, recent large abundance “ultra-diffuse galaxies” beyond reach previous spectroscopic surveys suggest our understanding galaxy population may be incomplete. Here we report serendipitous discovery an quiescent in nearby Universe, which was imaged as part JWST PEARLS Guaranteed Time Observation program. Remarkably, individual...
We describe the production and verification of sky maps five Spectral Photometric Imaging Receiver (SPIRE) fields observed as part Herschel Multi-tiered Extragalactic Survey (HerMES) during Science Demonstration Phase (SDP) mission. have implemented an iterative map-making algorithm [The SPIRE-HerMES Iterative Mapper (SHIM)] to produce high fidelity that preserve extended diffuse emission on while exploiting repeated observations same region with many detectors in multiple scan directions...
We present a new distance estimation method for dust-continuum-identified molecular cloud clumps. Recent (sub-)millimeter Galactic plane surveys have cataloged tens of thousands these objects, plausible precursors to stellar clusters, but detailed study their physical properties requires robust determinations. derive Bayesian probability density functions (DPDFs) 770 objects from the Bolocam Plane Survey in longitude range 75 ⩽ ℓ 65°. The DPDF formalism is based on kinematic distances, and...
We present the results of a gravitational lensing analysis bright $\zs=2.957$ sub-millimeter galaxy (SMG), HERMES J105751.1+573027 found in {\it Herschel}/SPIRE Science Demonstration Phase data from Herschel Multi-tiered Extragalactic Survey (HerMES) project. The high resolution imaging available optical and Near-IR channels, along with CO emission obtained Plateau de Bure Interferometer, allow us to precisely estimate intrinsic source extension hence total magnification be $\mu=10.9\pm...
We use the distance probability density function formalism of Ellsworth-Bowers et al. to derive physical properties for collection 1,710 Bolocam Galactic Plane Survey (BGPS) version 2 sources with well-constrained estimates. To account Malmquist bias, we estimate that present sample BGPS is 90% complete above and 50% . The mass distributions entire astrophysically motivated subsets are generally fitted well by a lognormal function, approximately power-law at high mass. Power-law behavior...
Abstract PEARLSDG was previously reported as an isolated dwarf galaxy with a TRGB distance of 30 Mpc. New data show this to not be the case. We report new spectroscopic redshift 0.02809, which argues for association group galaxies at ∼124
The Lowell Discovery Telescope (LDT, formerly known as the DCT) is a 4.3-m telescope designed and constructed for optical near infrared astronomical observation. We present evolution over time of LDT's image quality ways to improve it, upgrades instrument suite, lessons learned from operating during pandemic.
A wealth of observations have long suggested that the vast majority isolated classical dwarf galaxies ($M_*=10^7$-$10^9$ M$_\odot$) are currently star-forming. However, recent large abundance "Ultra-Diffuse Galaxies" beyond reach previous spectroscopic surveys suggest our understanding galaxy population may be incomplete. Here we report serendipitous discovery an quiescent in nearby Universe, which was imaged as part PEARLS GTO program. Remarkably, individual red-giant branch stars visible...