Search Publications
New candidate hypervelocity red clump stars in the inner Galactic bulge
Minniti, D.; Rejkuba, M.; Luna, A. +5 more
We search for high-velocity stars in the inner region of the Galactic bulge using a selected sample of red clump stars. Some of those stars might be considered hypervelocity stars (HVSs). Even though the HVSs ejection relies on an interaction with the supermassive black hole (SMBH) at the centre of the Galaxy, there are no confirmed detections of …
SRG/ART-XC Galactic Bulge deep survey. II. Catalogue of point sources
Sunyaev, R.; Krivonos, R.; Sazonov, S. +20 more
We present a catalogue of point sources detected with the Mikhail Pavlinsky ART-XC telescope onboard the SRG observatory during a wide-field survey of the Galactic Bulge that was conducted as part of the mission's calibration and performance verification phase in 2019. The survey consisted of nearly 18 d of consecutive scanning observations of the…
Understanding the universal dust attenuation scaling relation of star-forming galaxies
Zheng, Xian Zhong; An, Fang Xia; Xu, Haiguang +17 more
Star-forming galaxies (SFGs) adhere to a surprisingly tight scaling relation of dust attenuation parametrized by the infrared excess (IRX≡ LIR/LUV), being jointly determined by the star formation rate (SFR), galaxy size (Re), metallicity (Z/Z⊙), and axial ratio (b/a). We examine how these galaxy paramete…
Flickering pulsations in bright X-ray pulsars: the evidence of gravitationally lensed and eclipsed accretion column
Tsygankov, Sergey S.; Mushtukov, Alexander A.; Mereminskiy, Ilya A. +1 more
It is expected that the extreme mass accretion rate onto strongly magnetized neutron stars results in the appearance of accretion columns above the stellar surface. For a distant observer, rotation of a star results in periodic variations of X-ray flux. Because the mass accretion rate fluctuates around the average value, the pulse profiles are not…
Model-independent test of the running Hubble constant from the Type Ia supernovae and the Hubble parameter data
Zhang, Kaituo; Xu, Bing; Xu, Jiancheng +2 more
In this study, we model-independently investigate the behaviour of running Hubble constant, characterized by the fit function $H_{\rm 0}(z)=\tilde{H_{\rm {0}}}/(1+z)^{\alpha }$, where α represents the evolutionary parameter and ${\tilde{H_{\rm {0}}}}$ corresponds to the current value of Hubble constant. Our analysis utilizes the expansion rate E(z…
Nine new M dwarf planet candidates from TESS including five gas giants
Kunimoto, Michelle; Eschen, Yoshi Nike Emilia
We present the detection of nine new planet candidates orbiting M dwarfs, identified using an independent search and vetting pipeline applied to TESS Full-Frame Image data from Sectors 1 to 63. Our candidates include planets as small as 1.4 $\mathrm{ R}_{{\oplus }}$, with orbital periods up to 20 d. Among the nine new candidates, we identified fiv…
Non-conventional approach for deriving the radial sizes of coronal mass ejections at different instances: discrepancies in the estimates between remote and in situ observations
Mishra, Wageesh; Agarwal, Anjali
Understanding the evolution of radial sizes and instantaneous expansion speeds of coronal mass ejections (CMEs) is crucial for assessing their impact duration on Earth's environment. We introduce a non-conventional approach to derive the CME's radial sizes and expansion speeds at different instances during its passage over a single-point in situ s…
Implications on star formation rate indicators from H II regions and diffuse ionized gas in the M101 Group
Watkins, A. E.; Mihos, J. C.; Harding, P. +1 more
We examine the connection between diffuse ionized gas (DIG), H II regions, and field O and B stars in the nearby spiral M101 and its dwarf companion NGC 5474 using ultra-deep H α narrow-band imaging and archival GALEX UV imaging. We find a strong correlation between DIG H α surface brightness and the incident ionizing flux leaked from the nearby H…
Zero-age horizontal branch models for -2.5 ≤ [Fe/H] ≤-0.5 and their implications for the apparent distance moduli of globular clusters
VandenBerg, Don A.
Grids of zero-age horizontal branch (ZAHB) models are presented, along with a suitable interpolation code, for -2.5 ≤ [Fe/H] ≤ -0.5, in steps of 0.2 dex, assuming Y = 0.25 and 0.29, [O/Fe] = +0.4 and +0.6, and [m/Fe] = +0.4 for all of the other α-elements. The HB populations of 37 globular clusters (GCs) are fitted to these ZAHBs to derive their a…
Proper motion of the radio jets in two blazars at redshift above 3
Paragi, Zsolt; Krezinger, Máté; Frey, Sándor +7 more
There is still a limited number of high-redshift (z > 3) active galactic nuclei (AGNs) whose jet kinematics have been studied with very long baseline interferometry (VLBI). Without a dedicated proper motion survey, regularly conducted astrometric VLBI observations of bright radio-emitting AGN with sensitive arrays can be utilized to follow chan…