Search Publications
HST Imaging of Star-forming Clumps in Six GASP Ram-pressure-stripped Galaxies
Scarlata, Claudia; Calzetti, Daniela; Vulcani, Benedetta +6 more
Exploiting broad- and narrowband images of the Hubble Space Telescope from the near-UV to I-band rest frame, we study the star-forming clumps of six galaxies of the GASP sample undergoing strong ram pressure stripping. Clumps are detected in Hα and near-UV, tracing star formation on different timescales. We consider clumps located in galaxy disks …
AGN STORM 2. III. A NICER View of the Variable X-Ray Obscurer in Mrk 817
Kaspi, Shai; Filippenko, Alexei V.; Hall, Patrick B. +46 more
The AGN STORM 2 Collaboration targeted the Seyfert 1 galaxy Mrk 817 for a year-long multiwavelength, coordinated reverberation mapping campaign including Hubble Space Telescope, Swift, XMM-Newton, NICER, and ground-based observatories. Early observations with NICER and XMM revealed an X-ray state 10 times fainter than historical observations, cons…
Identification and Characterization of a Large Sample of Distant Active Dwarf Galaxies in XMM-SERVS
Brandt, W. N.; Zou, Fan; Bauer, Franz E. +10 more
Active dwarf galaxies are important because they contribute to the evolution of dwarf galaxies and can reveal their hosted massive black holes. However, the sample size of such sources beyond the local universe is still highly limited. In this work, we search for active dwarf galaxies in the recently completed XMM-Spitzer Extragalactic Representat…
Multiwavelength Observations of a New Redback Millisecond Pulsar 4FGL J1910.7-5320
Strader, Jay; Kong, Albert K. H.; Aydi, Elias +9 more
We present the study of multiwavelength observations of an unidentified Fermi Large Area Telescope (LAT) source, 4FGL J1910.7-5320, a new candidate redback millisecond pulsar binary. In the 4FGL 95% error region of 4FGL J1910.7-5320, we find a possible binary with a 8.36 hr orbital period from the Catalina Real-Time Transient Survey, confirmed by …
Resolved CO(1-0) Emission and Gas Properties in Luminous Dusty Star-forming Galaxies at z = 2-4
Berta, S.; Ivison, R. J.; Omont, A. +15 more
We present the results of a survey of CO(1-0) emission in 14 infrared luminous dusty star-forming galaxies (DSFGs) at 2 < z < 4 with the NSF's Karl G. Jansky Very Large Array. All sources are detected in 12CO(1-0), with an angular resolution of ~1″. Seven sources show extended and complex structure. We measure CO luminosities of $…
On the Origin of the North Celestial Pole Loop
Martin, Peter G.; Marchal, Antoine
The North Celestial Pole Loop (NCPL) provides a unique laboratory for studying the early-stage precursors of star formation. Uncovering its origin is key to understanding the dynamical mechanisms that control the evolution of its contents. In this study, we explore the 3D geometry and the dynamics of the NCPL using high-resolution dust extinction …
r-process Abundance Patterns in the Globular Cluster M92
Kovalev, Mikhail; Ji, Alexander P.; Kirby, Evan N.
Whereas light-element abundance variations are a hallmark of globular clusters, there is little evidence for variations in neutron-capture elements. A significant exception is M15, which shows a star-to-star dispersion in neutron-capture abundances of at least one order of magnitude. The literature contains evidence both for and against a neutron-…
SPYGLASS. IV. New Stellar Survey of Recent Star Formation within 1 kpc
Rizzuto, Aaron C.; Kraus, Adam L.; Kerr, Ronan
Young stellar populations provide a powerful record that traces millions of years of star formation history in the solar neighborhood. Using a revised form of the SPYGLASS young star identification methodology, we produce an expanded census of nearby young stars (age < 50 Myr). We then use the HDBSCAN clustering algorithm to produce a new SPYGL…
Discovery of an Exceptional Optical Nebulosity in the Suspected Galactic SN Iax Remnant Pa 30 Linked to the Historical Guest Star of 1181 CE
Schaefer, Bradley E.; Fesen, Robert A.; Patchick, Dana
A newly recognized young Galactic supernova (SN) remnant, Pa 30 (G123.1+4.6), centered on a hot central star with a ~16,000 km s-1 wind velocity, has recently been proposed to be the result of a double-degenerate merger leading to an SN Iax event associated with the guest star of 1181 CE. Here we present deep optical [S II] λλ6716,6731 …
Probing the Star Formation Main Sequence Down to 108 M ⊙ at 1.0 < z < 3.0
Barro, Guillermo; Pérez-González, Pablo G.; Costantin, Luca +8 more
We investigate the star formation main sequence (MS; SFR-M ⋆) down to 108-9 M ⊙ using a sample of 34,061 newly discovered ultrafaint (27 mag ≲ i ≲ 30 mag) galaxies at 1 < z < 3 detected in the GOODS-N field. Virtually none of these galaxies are contained in previous public catalogs, effectively doubling the n…