| Program Number | Principal Investigator | Program Title |
|---|---|---|
| 13711 | Abhijit Saha, National Optical Astronomy Observatory, AURA | Establishing a Network of Next Generation SED standards with DA White Dwarfs |
| 13749 | David V. Bowen, Princeton University | Baryon Structures Around Nearby Galaxies: Using an Edge-On Disk to Assess Inflow/Outflow Models |
| 13750 | John M. Cannon, Macalester College | Fundamental Parameters of the SHIELD II Galaxies |
| 13757 | Saurabh W. Jha, Rutgers the State University of New Jersey | The Progenitor System of a Peculiar Thermonuclear White-Dwarf Supernova |
| 13765 | Bradley M Peterson, The Ohio State University | A Cepheid-Based Distance to the Benchmark AGN NGC 4151 |
| 13767 | Michele Trenti, University of Melbourne | Bright Galaxies at Hubble's Detection Frontier: The redshift z~9-10 BoRG pure-parallel survey |
| 13773 | Rupali Chandar, University of Toledo | H-alpha LEGUS: Unveiling the Interplay Between Stars, Star Clusters, and Ionized Gas |
| 13851 | Howard E. Bond, The Pennsylvania State University | The Origin of Intermediate-Luminosity Red Transients |
| 14038 | Jennifer Lotz, Space Telescope Science Institute | HST Frontier Fields - Observations of Abell 370 |
| 14068 | Robert Scott Barrows, University of Colorado at Boulder | Resolving the Nuclear Regions of Confirmed Offset AGN |
| 14071 | Sanchayeeta Borthakur, The Johns Hopkins University | How are HI Disks Fed? Probing Condensation at the Disk-Halo Interface |
| 14076 | Boris T. Gaensicke, The University of Warwick | An HST legacy ultraviolet spectroscopic survey of the 13pc white dwarf sample |
| 14077 | Boris T. Gaensicke, The University of Warwick | The frequency and chemical composition of rocky planetary debris around young white dwarfs: Plugging the last gaps |
| 14095 | Gabriel Brammer, Space Telescope Science Institute - ESA | Calibrating the Dusty Cosmos: Extinction Maps of Nearby Galaxies |
| 14096 | Dan Coe, Space Telescope Science Institute - ESA | RELICS: Reionization Lensing Cluster Survey |
| 14119 | Luciana C. Bianchi, The Johns Hopkins University | Understanding Stellar Evolution of Intermediate-Mass Stars from a New Sample of SiriusB-Like Binaries |
| 14127 | Michele Fumagalli, Durham Univ. | First Measurement of the Small Scale Structure of Circumgalactic Gas via Grism Spectra of Close Quasar Pairs |
| 14168 | Daniel P. Stark, University of Arizona | COS Views of He II Emitting Star Forming Galaxies: Preparing for the JWST Era |
| 14176 | Gerard A. Kriss, Space Telescope Science Institute | Measuring Absolute Abundances in NGC 5548 and Definitively Linking the UV and X-ray Outflows |
| 14178 | Matthew A. Malkan, University of California - Los Angeles | WFC3 Infrared Spectroscopic Parallel Survey: The WISP Deep Fields |
| 14185 | Ran Wang, Peking University | Imaging the extended star formation in the host galaxy of a millimeter bright quasar at z=6.13ii |
| 14195 | John Evangelos Gizis, University of Delaware | Cloud Evolution on Uranus with K2 and HST |
| 14199 | Patrick Kelly, University of California - Berkeley | Refsdal Redux: Precise Measurements of the Reappearance of the First Supernova with Multiple Resolved Images |
| 14201 | Sangeeta Malhotra, Arizona State University | Lyman alpha escape in Green Pea galaxies (give peas a chance) |
| 14216 | Robert P. Kirshner, Harvard University | RAISIN2: Tracers of cosmic expansion with SN IA in the IR |
| 14219 | John P. Blakeslee, Dominion Astrophysical Observatory | Homogeneous Distances and Central Profiles for MASSIVE Survey Galaxies with Supermassive Black Holes |
| 14234 | Joshua D. Simon, Carnegie Institution of Washington | The Lowest Luminosity Star-Forming Galaxy |
| 14243 | Deirdre Coffey, University College Dublin | True Jet Rotation Probed in NUV Jet Core |
| 14262 | Knud Jahnke, Max-Planck-Institut fur Astronomie, Heidelberg | Are the fastest growing black holes at z=2 caused by major galaxy mergers? |
| 14327 | Saul Perlmutter, University of California - Berkeley | See Change: Testing time-varying dark energy with z>1 supernovae and their massive cluster hosts |
GO 13773: H-alpha LEGUS: Unveiling the Interplay Between Stars, Star Clusters, and Ionized Gas
UGC 4305 = Holmberg II - Arp 268, one of the star-forming galaxies targeted by LEGUS |
Understanding the global architecture of star formation is a key step towards understanding the morphological evolution of galaxies and the characteristics of the underlying stellar populations. HST has devoted extensive resources to observations of nearby galaxies over its lifetime, including detailed surveys of a handful of systems, notably the PHAT survey of M31, with the enhanced imaging capabilities made available following SM4. Most programs, however, have focused on optical, far-red and, to a lesser extent, near-infrared wavelengths. While those observations provide high-quality colour-magnitude data that enable an exploration of relatively mature populations, they are less effective at probing active star-formation sites populated by young, high-mass stars. Those regions are most prominent at ultraviolet wavelengths. The HST LEGUS capitalises on the past heritage of HST observations by adding near-UV imaging for 50 nearby galaxies, drawn from a catalogue of 400 systems within ~11 Mpc of the Milky Way. They have been selected to provide a fair sampling of the wide variety of galactic systems within that volume. LEGUS itself is imaging star-forming regions at near-UV and blue wavelengths using the WFC3 UVIS channel with the F275W, F336W and F438W filters, supplemented by F55W and F814W (V and I) where necessary. The present program builds on that foundation by adding WFC3 narrow-band (F657N) H-alpha imaging of 32 galaxies from the sample. |
GO 14068: Resolving the Nuclear Regions of Confirmed Offset AGN
 Some examples of galaxies with offset AGN (see Julia Comerford's webpage ). |
Active galaxies (AGNs) are generally luminous systems with compact nuclei, characterised by the presence of strong nuclear emission lines of numerous species including H, He I, He II, and Fe, Ca, O, C and S over a range of ionisations. These features originate from gas clouds in the nuclear regions, with the energy supplied through accretion onto a massive black hole. The high-temperature, rapidly-rotating gas clouds nearest the central engine are responsible for producing both broad emission lines and high energy radiation at UV and X-ray wavelengths. In the ovewhelming majority of systems, the high energy radiation is concentrated at the centre of the galactic nucleus, as one would expect if massive black holes were the seeds for subsequent galaxy formation. In a few cases, however, the X-ray activity appears to be distinctly offset from the centre of the visible light. The most probably explanation for this phenomenon is that these systems are mergers, with the AGN marking the nucleus of one galaxy. The present program aims to test this hypothesis through high ersolution HST imaging of 10 such systems selected from the Sloan Digital Sky Survey. The WFC3 UVIS and IR cameras will be used to map the central regions and determine the detailed system morphology. |
GO 14096: RELICS: Reionization Lensing Cluster Survey
Hubble image and mass map for the cluster ACT-CL J0102-4915, one of the clusters included in the RELICS program |
The overwhelming majority of galaxies in the universe are found in clusters. As such, those systems offer an important means of tracing the development of large-scale structure through the history of the universe. Moreover, as intense concentrations of mass, galaxy clusters provide highly efficient gravitational lenses, capable of concentrating and magnifying light from background high redshift galaxies to allow detailed spectropic investigations of star formation in the early universe. Hubble imaging has already revealed lensed arcs and detailed sub-structure within a handful of rich clusters. At the same time, the lensing characteristics provide information on the mass distribution within the lensing cluster. The present program builds on the highly successful CLASH program,which used 17-colour ACS/WFC3 images to map 25 galaxy clusters, tracing the mas profile and the dark matter distribution, and the Frontier Fields program, targeting six clusters for deep multi-colour imaging. RELICS is focused on using massive galaxy clusters as gravitational telescopes, searching for strongly lensed background galaxies drawn from the high redshift universe. Imaging 46 fields in 41 galaxy clusters, this program aims to identify galaxies with redshifts in the range 9 < z < 12. By targeting strongly-lensing clusters, standard models for galaxy evolution suggest that the program can deliver ~100 galaxies in that redshift range, together with more than 150 galaxies at z~8. A significant number of these galaxies should be brighter than H~25.5, and therefore accessible to more detailed follow-up observations. Conversely, the actual number of galaxies detected will set constraints on the galaxy number-redshift distribution, and the overall formation and assembly history. |
GO 14178: WISP - A Survey of Star Formation Across Cosmic Time
A region of massive star formation |
Star formation is the key astrophysical process in determining the overall evolution of galactic systems, the generation of heavy elements, and the overall enrichment of interstellar and intergalactic material. Tracing the overall evolution through a wide redshift range is crucial to understanding how gas and stars evolved to form the galaxies that we see around us now. The present program builds on the ability of HST to carry out parallel observations, using more than one instrument. While the Cosmic Origins Spectrograph is focused on obtaining ultraviolet spectra of unparalleled signal-to-noise, this program uses the near-infrared grisms mounted on the Wide-Field Camera 3 infrared channel to obtain low resolution spectra between 1 and 1.6 microns of randomly-selected nearby fields. The goal is to search for emission lines characteristic of star-forming regions. In particular, these observations are capable of detecting Lyman-alpha emission generated by star formation at redshifts z > 5.6. A total of up to 40 "deep" (4-5 orbit) and 20 "shallow" (2-3 orbit) fields will be targeted in the course of this observing campaign. |