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AGN STORM 2. IV. Swift X-Ray and Ultraviolet/Optical Monitoring of Mrk 817
Kaspi, Shai; Filippenko, Alexei V.; Hall, Patrick B. +48 more
The AGN STORM 2 campaign is a large, multiwavelength reverberation mapping project designed to trace out the structure of Mrk 817 from the inner accretion disk to the broad emission line region and out to the dusty torus. As part of this campaign, Swift performed daily monitoring of Mrk 817 for approximately 15 months, obtaining observations in X-…
ALMA Reveals a Stable Rotating Gas Disk in a Paradoxical Low-mass, Ultradusty Galaxy at z = 4.274
Murphy, Eric; Brammer, Gabriel; Marchesini, Danilo +13 more
We report ALMA detections of [C II] and a dust continuum in Az9, a multiply imaged galaxy behind the Frontier Field cluster MACS J0717.5+3745. The bright [C II] emission line provides a spectroscopic redshift of z = 4.274. This strongly lensed (µ = 7 ± 1) galaxy has an intrinsic stellar mass of only 2 × 109 M ⊙ and a to…
The study of 11 contact binaries with mass ratios less than 0.1
Wang, Xi; Li, Kai; Gao, Xing +6 more
Multi-band photometric observations of 11 totally eclipsing contact binaries were carried out. Applying the Wilson-Devinney program, photometric solutions were obtained. There are two W-subtype systems, which are CRTS J133031.1+161202 and CRTS J154254.0+324652, and the rest of the systems are A-subtype systems. CRTS J154254.0 + 324652 has the high…
Resolving ambiguities in the inferred star formation histories of intense [O III] emitters in the reionization Era
Laporte, N.; Ellis, R. S.; Roberts-Borsani, G. +1 more
Early JWST spectroscopic campaigns have confirmed the presence of strong [O III] line-emitting galaxies in the redshift interval 7 < z < 9. Although deduced earlier from Spitzer photometry as an indicative of young stellar populations, some studies suggested the relevant photometric excesses attributed to [O III] emission could, in part, be …
New multiple AGN systems with subarcsec separation: Confirmation of candidates selected via the novel GMP method
Marconi, A.; Vignali, C.; Rosati, P. +18 more
The existence of multiple active galactic nuclei (AGNs) at small projected distances on the sky is due to either the presence of multiple, inspiraling supermassive black holes, or to gravitational lensing of a single AGN. Both phenomena allow us to address important astrophysical and cosmological questions. However, few kiloparsec-separation multi…
The CARMENES search for exoplanets around M dwarfs. A long-period planet around GJ 1151 measured with CARMENES and HARPS-N data
Nagel, E.; Amado, P. J.; Caballero, J. A. +38 more
Context. Detecting a planetary companion in a short-period orbit through radio emission from the interaction with its host star is a new prospect in exoplanet science. Recently, a tantalising signal was found close to the low-mass stellar system GJ 1151 using LOFAR observations.
Aims: We studied spectroscopic time-series data of GJ 1151 in or…
The Far Side of the Galactic Bar/Bulge Revealed through Semi-regular Variables
Huber, Daniel; Saunders, Nicholas; Bedding, Timothy R. +8 more
The Galactic bulge is critical to our understanding of the Milky Way. However, due to the lack of reliable stellar distances, the structure and kinematics of the bulge/bar beyond the Galactic center have remained largely unexplored. Here, we present a method to measure distances of luminous red giants using a period-amplitude-luminosity relation a…
The Low-redshift Lyman Continuum Survey: Optically Thin and Thick Mg II Lines as Probes of Lyman Continuum Escape
Henry, Alaina; Hayes, Matthew; Chisholm, John +14 more
The Mg II λλ2796, 2803 doublet has been suggested as a useful indirect indicator for the escape of Lyα and Lyman continuum (LyC) photons in local star-forming galaxies. However, studies to date have focused on small samples of galaxies with strong Mg II or strong LyC emission. Here, we present the first study of Mg II to probe a large dynamic rang…
A polarimetrically oriented X-ray stare at the accreting pulsar EXO 2030+375
Kaaret, Philip; Wu, Kinwah; Enoto, Teruaki +105 more
Accreting X-ray pulsars (XRPs) are presumed to be ideal targets for polarization measurements, as their high magnetic field strength is expected to polarize the emission up to a polarization degree of ∼80%. However, such expectations are being challenged by recent observations of XRPs with the Imaging X-ray Polarimeter Explorer (IXPE). Here, we re…
JWST and ALMA Imaging of Dust-obscured, Massive Substructures in a Typical z ∼ 3 Star-forming Disk Galaxy
Giavalisco, Mauro; Schramm, Malte; Daddi, Emanuele +8 more
We present an identification of dust-attenuated star-forming galactic-disk substructures in a typical star-forming galaxy (SFG), UDF2, at z = 2.696. To date, substructures containing significant buildup of stellar mass and actively forming stars have yet to be found in typical (i.e., main-sequence) SFGs at z > 2. This is due to the strong dust …