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SPT-CL J2032-5627: A new Southern double relic cluster observed with ASKAP
Pratt, G. W.; Bartalucci, I.; Johnston-Hollitt, M. +2 more
We present a radio and X-ray analysis of the galaxy cluster SPT-CL J2032-5627. Investigation of public data from the Australian Square Kilometre Array Pathfinder (ASKAP) at 943 MHz shows two previously undetected radio relics at either side of the cluster. For both relic sources, we utilise archival Australia Telescope Compact Array (ATCA) data at…
The ALMA Spectroscopic Survey in the HUDF: A Search for [C II] Emitters at 6 ≤ z ≤ 8
Carilli, Chris; Inami, Hanae; Stefanon, Mauro +18 more
The Atacama Large Millimeter/submillimeter Array (ALMA) Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS) Band 6 scan (212-272 GHz) covers potential [C II] emission in galaxies at 6 ≤ z ≤ 8 throughout a 2.9 arcmin2 area. By selecting on known Lyα emitters (LAEs) and photometric dropout galaxies in the field, we perform target…
Characterizing dynamical states of Galactic open clusters with Gaia DR2
Corradi, W. J. B.; Ferreira, F. A.; Maia, F. F. S. +2 more
In this work, we investigate the dynamical properties of 38 Galactic open clusters: 34 of them are located at low Galactic latitudes (|b| < 10°) and are projected against dense stellar fields; the other four comparison objects present clearer contrasts with the field population. We determine structural and time-related parameters that are assoc…
Gaia-based Isochronal, Kinematic, and Spatial Analysis of the ɛ Cha Association
Kastner, Joel H.; Dickson-Vandervelde, D. Annie; Wilson, Emily C.
The precise parallax, proper motion, and photometric measurements contained in Gaia Data Release 2 (DR2) offer the opportunity to reexamine the membership and ages of nearby young moving groups (NYMGs), i.e., loose groups of stars of age ≲100 Myr in the solar vicinity. Here, we analyze the available DR2 data for members and candidate members of th…
Star formation in the nearby dwarf galaxy DDO 53: interplay between gas accretion and stellar feedback
Egorov, Oleg V.; Lozinskaya, Tatiana A.; Vasiliev, Konstantin I. +4 more
We present the results of a multiwavelength study of the nearby dwarf galaxy DDO 53 - a relatively isolated member of the M 81 group. We analyse the atomic and ionized gas kinematics (based on the observations with Fabry-Perot interferometer in H α line and archival data in H I 21 cm line), distribution, excitation, and oxygen abundance of the ion…
The McDonald Accelerating Stars Survey (MASS): Discovery of a Long-period Substellar Companion Orbiting the Old Solar Analog HD 47127
Cochran, William D.; Endl, Michael; Crepp, Justin R. +12 more
Brown dwarfs with well-determined ages, luminosities, and masses provide rare but valuable tests of low-temperature atmospheric and evolutionary models. We present the discovery and dynamical mass measurement of a substellar companion to HD 47127, an old (≈7-10 Gyr) G5 main-sequence star with a mass similar to the Sun. Radial velocities of the hos…
Three ultraluminous X-ray sources hosted by globular clusters in NGC 1316
Kundu, Arunav; Strader, Jay; Dage, Kristen C. +8 more
We have identified three ultraluminous X-ray sources (ULXs) hosted by globular clusters (GCs) within NGC 1316's stellar system. These discoveries bring the total number of known ULXs in GCs up to 20. We find that the X-ray spectra of the three new sources do not deviate from the established pattern of spectral behaviour of the other known GC ULXs.…
Further support for a trio of mass-to-light deviations in Abell 370: free-form GRALE lens inversion using BUFFALO strong lensing data
Koekemoer, Anton M.; Mahler, Guillaume; Acebron, Ana +9 more
We use the Beyond Ultra-deep Frontier Fields and Legacy Observations (BUFFALO) strong lensing image catalogue of the merging galaxy cluster Abell 370 to obtain a mass model using free-form lens inversion algorithm GRALE. The improvement of the strong lensing data quality results in a lens plane rms of only 0.45 arcsec, about a factor of two lower …
Testing the evolution of correlations between supermassive black holes and their host galaxies using eight strongly lensed quasars
Treu, Tommaso; Auger, Matthew W.; Birrer, Simon +9 more
One of the main challenges in using high-redshift active galactic nuclei (AGNs) to study the correlations between the mass of a supermassive black hole ($\mathcal {M}_{\rm BH}$) and the properties of its active host galaxy is instrumental resolution. Strong lensing magnification effectively increases instrumental resolution and thus helps to addre…
Tomography of the Unique Ongoing Jet in the Planetary Nebula NGC 2392
Guerrero, M. A.; Toalá, J. A.; Ramos-Larios, G. +5 more
Jets (fast collimated outflows) are claimed to be the main shaping agent of the most asymmetric planetary nebulae (PNs), as they impinge on the circumstellar material at late stages of the asymptotic giant branch phase. The first jet detected in a PN was that of NGC 2392, yet there is no available image because of its low surface brightness contra…