Search Publications
Determination of dynamical ages of open clusters through the A+ parameter - I
Vaidya, Kaushar; Rao, Khushboo K.; Agarwal, Manan +1 more
The sedimentation level of blue straggler stars (BSS) has been shown to be a great tool to investigate the dynamical states of globular clusters (GCs). The area enclosed between the cumulative radial distributions of BSS and a reference population up to the half-mass radius of the clusters, $A^+_{\mathrm{rh}}$, is known to be a measure of the sedi…
The shape and scatter of the galaxy main sequence for massive galaxies at cosmic noon
Papovich, Casey; Finkelstein, Steven L.; Stevans, Matthew L. +7 more
We present the main sequence for all galaxies and star-forming galaxies for a sample of 28 469 massive (M⋆ ≥ 1011 M⊙) galaxies at cosmic noon (1.5 < z < 3.0), uniformly selected from a 17.5 deg2 area (0.33 Gpc3 comoving volume at these redshifts). Our large sample allows for a novel appr…
Compact galaxies and the size-mass galaxy distribution from a colour-selected sample at 0.04 < z < 0.15 supplemented by ugrizYJHK photometric redshifts
Baldry, Ivan K.; Sullivan, Tricia; Rani, Raffaele +1 more
The size-mass galaxy distribution is a key diagnostic for galaxy evolution. Massive compact galaxies are potential surviving relics of a high-redshift phase of star formation. Some of these could be nearly unresolved in Sloan Digital Sky Survey (SDSS) imaging and thus not included in galaxy samples. To overcome this, a sample was selected from the…
Galactic open cluster Cepheids - a census based on Gaia EDR3
Chen, Xiaodian; Zhou, Xiaoyue
In the Gaia era, the membership analysis and parameter determination of open clusters (OCs) are more accurate. We performed a census of OC's classical Cepheids based on Gaia Early Data Release 3 (EDR3) and obtained a sample of 33 OC Cepheids fulfilling the constraints of the spatial position, proper motion, parallax, and evolution state. 13 of 33 …
The Galactic neutron star population - I. An extragalactic view of the Milky Way and the implications for fast radio bursts
Lyman, J. D.; Groot, P. J.; Nelemans, G. +2 more
A key tool astronomers have to investigate the nature of extragalactic transients is their position on their host galaxies. Galactocentric offsets, enclosed fluxes, and the fraction of light statistic are widely used at different wavelengths to help infer the nature of transient progenitors. Motivated by the proposed link between magnetars and fas…
A first glimpse at the Galactic plane with the ASKAP: the SCORPIO field
Umana, G.; Michałowski, M. J.; Kothes, R. +25 more
In the broad context of the Australian Square Kilometer Array Pathfinder (ASKAP) early-science phase and preparation for the related surveys, we report the first radio observations towards the Galactic plane. The targeted field was chosen to encompass the entire SCORPIO survey, one of the several pathfinder projects for the Evolutionary Map of the…
Repeated pattern of gamma-ray flares in the light curve of the blazar 3C 279
Larionov, V. M.; Blinov, D.; Jorstad, S. G. +10 more
The optical polarization plane of some blazars occasionally exhibits smooth hundred degree long rotations. Multiple theoretical models have been proposed to explain the nature of such events. A deterministic origin of these rotations, however, remains uncertain. We aim to find repeating patterns of flares in gamma-ray light curves of blazars, whic…
Wind-luminosity evolution in NLS1 AGN 1H 0707-495
Fabian, Andrew C.; Walton, Dominic J.; Guainazzi, Matteo +7 more
Ultrafast outflows (UFOs) have been detected in the high-quality X-ray spectra of a number of active galactic nuclei (AGNs) with fairly high accretion rates and are thought to significantly contribute to the AGN feedback. After a decade of dedicated study, their launching mechanisms and structure are still not well understood, but variability tech…
Presence of red giant population in the foreground stellar substructure of the Small Magellanic Cloud
Kartha, Sreeja S.; de Grijs, Richard; Cioni, Maria-Rosa L. +8 more
The eastern region of the Small Magellanic Cloud (SMC) is found to have a foreground stellar substructure, which is identified as a distance bimodality (~12 kpc apart) in the previous studies using red clump (RC) stars. Interestingly, studies of red giant branch (RGB) stars in the eastern SMC indicate a bimodal radial velocity (RV) distribution. I…
Probing the CGM of low-redshift dwarf galaxies using FIRE simulations
Stern, Jonathan; Faucher-Giguère, Claude-André; Hafen, Zachary +7 more
Observations of ultraviolet (UV) metal absorption lines have provided insight into the structure and composition of the circumgalactic medium (CGM) around galaxies. We compare these observations with the low-redshift (z ≤ 0.3) CGM around dwarf galaxies in high-resolution cosmological zoom-in runs in the FIRE-2 (Feedback In Realistic Environments) …