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Cosmic Evolution of Barred Galaxies up to z 0.84
Park, Myeong-Gu; Ann, Hong Bae; Sheth, Kartik +4 more
We explore the cosmic evolution of the bar length, strength, and light deficit around the bar for 379 barred galaxies at 0.2 < z ≤ 0.835 using F814W images from the COSMOS survey. Our sample covers galaxies with stellar masses $10.0\leqslant \mathrm{log}({M}_{* }/{M}_{\odot })\leqslant 11.4$ and various Hubble types. The bar length is strongly …
Press-Schechter primordial black hole mass functions and their observational constraints
Padilla, Nelson D.; Magaña, Juan; Sureda, Joaquín +1 more
We present a modification of the Press-Schechter (PS) formalism to derive general mass functions for primordial black holes (PBHs), considering their formation as being associated with the amplitude of linear energy density fluctuations. To accommodate a wide range of physical relations between the linear and non-linear conditions for collapse, we…
Discovery of a New Redback Millisecond Pulsar Candidate: 4FGL J0940.3-7610
Strader, Jay; Dage, Kristen C.; Chomiuk, Laura +3 more
We have discovered a new candidate redback millisecond pulsar binary near the center of the error ellipse of the bright unassociated Fermi-LAT γ-ray source 4FGL J0940.3-7610. The candidate counterpart is a variable optical source that also shows faint X-ray emission. Optical photometric and spectroscopic monitoring with the SOAR telescope indicate…
X-Ray Emission from the PeVatron-candidate Supernova Remnant G106.3+2.7
Matsumoto, Hironori; Bamba, Aya; Fujita, Yutaka +1 more
We report the discovery of diffuse X-ray emission around the supernova remnant (SNR) G106.3+2.7, which is associated with VER J2227+608 and HAWC J2227+610 and is known as a candidate for a PeV cosmic-ray accelerator (PeVatron). We analyze observational data of Suzaku around the SNR and the adjacent pulsar PSR J2229+6114. We find diffuse X-ray emis…
On the Co-orbitation of Satellite Galaxies along the Great Plane of Andromeda: NGC 147, NGC 185, and Expectations from Cosmological Simulations
Pawlowski, Marcel S.; Tony Sohn, Sangmo
Half of the satellite galaxies of Andromeda form a narrow plane termed the Great Plane of Andromeda (GPoA), and their line-of-sight velocities display a correlation reminiscent of a rotating structure. Recently reported first proper-motion measurements for the on-plane satellites NGC 147 and NGC 185 indicate that they indeed co-orbit along the GPo…
The Dusty Heart of NGC 4151 Revealed by λ ∼ 1-40 µm Reverberation Mapping and Variability: A Challenge to Current Clumpy Torus Models
Lyu, Jianwei; Rieke, George H.
We probe the dusty environment of the archetypical Type 1 active galactic nucleus (AGN) in NGC 4151 with comprehensive IR reverberation mapping over several decades, in the J (∼1.22 µm), H (∼1.63 µm), K (∼2.19 µm), L (∼3.45 µm), and N bands (∼10.6 µm), plus multiple measurements at 20-40 µm. At 1-4 µm, the…
Orbital Torus Imaging: Using Element Abundances to Map Orbits and Mass in the Milky Way
Brownstein, Joel R.; Hogg, David W.; Rix, Hans-Walter +11 more
Many approaches to galaxy dynamics assume that the gravitational potential is simple and the distribution function is time invariant. Under these assumptions there are traditional tools for inferring potential parameters given observations of stellar kinematics (e.g., Jeans models). However, spectroscopic surveys measure many stellar properties be…
Correction to the Photometric Colors of Gaia Early Data Release 3
Niu, Zexi; Liu, Jifeng; Yuan, Haibo
In this work, we use the spectroscopy-based stellar color regression method with ∼0.7 million common stars between LAMOST DR7 and Gaia EDR3 to acquire color corrections in G - GRP and GBP - GRP. A sub-millimagnitude precision is achieved. Our results demonstrate that improvements in the calibration process of the E…
Spiral Arm Pattern Motion in the SAO 206462 Protoplanetary Disk
Dong, Ruobing; Pueyo, Laurent; Stolker, Tomas +5 more
Spiral arms have been observed in more than a dozen protoplanetary disks, yet the origin of nearly all systems is under debate. Multi-epoch monitoring of spiral arm morphology offers a dynamical way to distinguish two leading arm formation mechanisms: companion-driven and gravitational instability induction, since these mechanisms predict distinct…
Highly r-process enhanced stars in ultra-faint dwarf galaxies
Bromm, Volker; Besla, Gurtina; Jeon, Myoungwon
Highly r-process enhanced metal-poor stars (MP r-II; $\rm [Eu/Fe]\gt 1$ and $\rm [Fe/H]\lesssim -1.5$) have been observed in ultra-faint dwarf (UFD) galaxy, specifically in Reticulum II (Ret II). The fact that only a few UFDs contain such stars implies that the r-process site may reflect very rare but individually prolific events, such as neutron …