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Isochrone fitting of Galactic globular clusters - I. NGC 5904
Gontcharov, George A.; Mosenkov, Aleksandr V.; Khovritchev, Maxim Yu
We present new isochrone fits to colour-magnitude diagrams of the Galactic globular cluster NGC 5904 (M5). We utilize 29 photometric bands from the ultraviolet to mid-infrared by the use of the data from the Hubble Space Telescope, Gaia DR2, Wide-field Infrared Survey Explorer, Sloan Digital Sky Survey (SDSS), and other photometric data. In our is…
Exploring the nature and synchronicity of early cluster formation in the Large Magellanic Cloud - IV. Evidence for multiple populations in Hodge 11 and NGC 2210
Ventura, Paolo; Cohen, Roger E.; Sarajedini, Ata +10 more
We present a multiple population search in two old Large Magellanic Cloud (LMC) Globular clusters, Hodge 11 and NGC 2210. This work uses data from the Advanced Camera for Surveys and Wide Field Camera 3 on the Hubble Space Telescope from programme GO-14164 in Cycle 23. Both of these clusters exhibit a broadened main sequence with the second popula…
The Expansion of the Forward Shock of 1E 0102.2-7219 in X-Rays
Hughes, John P.; Plucinsky, Paul P.; Patnaude, Daniel J. +2 more
We measure the expansion of the forward shock of the Small Magellanic Cloud supernova remnant 1E 0102.2-7219 in X-rays using Chandra X-Ray Observatory on-axis Advanced CCD Imaging Spectrometer observations from 1999 to 2016. We estimate an expansion rate of 0.025% ± 0.006% yr-1 and a blast wave velocity of (1.61+/- 0.37)× {10}3
High-velocity string of knots in the outburst of the planetary nebula Hb4
Boumis, P.; Derlopa, S.; Akras, S. +1 more
The bipolar collimated outflows of the Hb4 planetary nebula (PN) exhibit an evident decrease in their expansion velocity with respect to the distance from the central star. So far, similar velocity law has also been found in Herbig-Haro objects. The interpretation of this peculiar velocity law and the classification of the outflows is the main foc…
Towards sub-kpc scale kinematics of molecular and ionized gas of star-forming galaxies at z ∼ 1
Chisholm, J.; Schaerer, D.; Dessauges-Zavadsky, M. +4 more
We compare the molecular and ionized gas kinematics of two strongly lensed galaxies at z ∼ 1 that lie on the main sequence at this redshift. The observations were made with ALMA and MUSE, respectively. We derive the CO and [O II] rotation curves and dispersion profiles of these two galaxies. We find a difference between the observed molecular and …
Tidal-locking-induced Stellar Rotation Dichotomy in the Open Cluster NGC 2287?
Deng, Licai; de Grijs, Richard; Li, Chengyuan +1 more
Stars spend most of their lifetimes on the “main sequence” (MS) in the Hertzsprung-Russell diagram. The obvious double MSs seen in the equivalent color-magnitude diagrams characteristic of Milky Way open clusters (OCs) pose a fundamental challenge to our traditional understanding of star clusters as “single stellar populations.” The clear MS bifur…
AGN photoionization of gas in companion galaxies as a probe of AGN radiation in time and direction
Schawinski, Kevin; Keel, William C.; Moiseev, Alexei V. +9 more
We consider AGN photoionization of gas in companion galaxies (cross-ionization) as a way to sample the intensity of AGN radiation in both direction and time, independent of the gas properties of the AGN host galaxies. From an initial set of 212 AGN+companion systems, identified with the help of Galaxy Zoo participants, we obtained long-slit optica…
FUGIN: Molecular Gas in Spitzer Bubble N4—Possible Evidence for a Cloud-Cloud Collision as a Trigger of Massive Star Formations
Yamagishi, Mitsuyoshi; Kuno, Nario; Tachihara, Kengo +17 more
Herein, we present 12CO (J = 1-0) and 13CO (J = 1-0) emission-line observations via the FOREST Unbiased Galactic plane Imaging survey with the Nobeyama 45 m telescope (FUGIN) toward Spitzer bubble N4. We observed clouds at three discrete velocities: 16, 19, and 25 km s-1. Their masses were 0.1 × 104 M
Variability studies and modelling of the blazar PKS 2155-304 in the light of a decade of multi-wavelength observations
Serpico, P. D.; Lenain, J. -P.; Maurin, G. +2 more
The variability of the high-frequency peaked BL Lac object PKS 2155-304 is studied using almost 10 years of optical, X-ray and γ-ray data. Publicly available data have been gathered and analysed with the aim to characterize the variability and to search for lognormality or periodic behaviour. The optical and X-ray range follow a lognormal process;…
Tidal disruption events from massive black hole binaries: predictions for ongoing and future surveys
Sesana, Alberto; Thorp, Stephen; Chadwick, Eli
We compute the expected cosmic rates of tidal disruption events (TDEs) induced by individual massive black holes (MBHs) and by MBH binaries (MBHBs) - with a specific focus on the latter class - to explore the potential of TDEs to probe the cosmic population of sub-pc MBHBs. Rates are computed by combining MBH and MBHB population models derived fro…