Search Publications
On the Connection between the Repeated X-Ray Quasiperiodic Oscillation and Warm Absorber in the Active Galaxy RE J1034+396
Nicastro, Fabrizio; Mao, Junjie; Wang, Yijun +3 more
We conduct an in-depth spectral analysis of ∼1 Ms XMM-Newton data of the narrow line Seyfert 1 galaxy RE J1034+396. The long exposure ensures high spectral quality and provides us with a detailed look at the intrinsic absorption and emission features toward this target. Two warm-absorber (WA) components with different ionization states ( $\mathrm{…
Spectral characterisation of the extinction properties of NGC 3603 using JWST NIRSpec
De Marchi, Guido; Brandl, Bernhard; Rogers, Ciarán
Context. A necessary ingredient in understanding the star formation history of a young cluster is knowledge of the extinction towards the region. This has typically been done by making use of the colour-difference method with photometry, or similar methods utilising the colour-colour diagram. These approaches rely on adopting an extinction law wit…
The X-ray binaries in M83: Will any of them form gravitational wave sources for LIGO-VIRGO-KAGRA?
Kotko, I.; Belczynski, K.
There are 214 X-ray point sources (LX > 1035 erg s−1) identified as X-ray binaries (XRBs) in the nearby spiral galaxy M83. Since XRBs are powered by accretion onto a neutron star (NS) or a black hole (BH) from a companion or donor star, these systems are promising progenitors of merging double compact objects (D…
Ages and metallicities of globular clusters in M81 using GTC/OSIRIS spectra
Cortesi, Arianna; Gómez-González, V. M. A.; Alzate, Jairo A. +8 more
We here present the results of an analysis of the optical spectroscopy of 42 globular cluster (GC) candidates in the nearby spiral galaxy M81 (3.61 Mpc). The spectra were obtained using the long-slit and multi-object spectroscopic modes of the OSIRIS instrument at the 10.4-m Gran Telescopio Canarias at a spectral resolution of ~1000. We used the c…
The FENIKS Survey: Multiwavelength Photometric Catalog in the UDS Field, and Catalogs of Photometric Redshifts and Stellar Population Properties
Papovich, Casey; Muzzin, Adam; Glazebrook, Karl +11 more
We present the construction of a deep multiwavelength point-spread-function-matched photometric catalog in the Ultra-Deep Survey (UDS) field following the final UKIDSS UDS release. The catalog includes photometry in 24 filters, from the MegaCam-uS 0.38 µm band to the Spitzer-IRAC 8 µm band, over ∼0.9 deg2 and with a 5σ depth…
Optical tomography of the born-again ejecta of A 58
Guerrero, M. A.; Toalá, J. A.; Santamaría, E. +2 more
In a born-again planetary nebula (PN), processed H-deficient material has been injected inside the old, H-rich nebula as a result of a very late thermal pulse (VLTP) event. Long-slit spectra have been used to unveil the chemical and physical differences between these two structures, but the ejection and shaping processes still remain unclear. To p…
Secular stability of surface abundance structures in the rapidly rotating Ap star 56 Ari
Potravnov, I.; Ryabchikova, T.; Piskunov, N.
The combination of the surface magnetic and abundance inhomogeneities in chemically peculiar Ap/Bp stars is responsible for their rotationally modulated variability. Within the framework of the fossil field hypothesis, these inhomogeneities are considered to be essentially stable over the main sequence timescale. However, a small group of Ap/Bp st…
BAL outflow in quasar B0254-3327B: analysis and comparison with other extreme UV outflows
Kriss, Gerard A.; Arav, Nahum; Dehghanian, Maryam +2 more
We have identified a broad absorption line (BAL) outflow in the HST/STIS spectrum of the quasar QSO B0254-3327B at velocity v = -3200 km s-1. The outflow has absorption troughs from ions such as Ne VIII, Na IX, Si XII, and Ne V. We also report the first detection of S XIV absorption troughs, implying very high ionization. Via measuremen…
Exploring Magnetic Coupling of Solar Atmosphere Through Frequency Modulations of 3-min Slow Magnetoacoustic Waves
Rawat, Ananya; Gupta, Girjesh
Coronal fan loops rooted in sunspot umbra show outward propagating waves with subsonic phase speed and a period around 3 min. However, their source region in the lower atmosphere is still ambiguous. We performed multi-wavelength observations of a clean fan loop system rooted in a sunspot utilizing data from the Interface Region Imaging Spectrograp…
Morphology of Molecular Clouds at Kiloparsec Scale in the Milky Way: Shear-induced Alignment and Vertical Confinement
Li, Guang-Xing; Chen, Bing-Qiu; Xie, Yi-Heng
The shape of the cold interstellar molecular gas is determined by several processes, including self-gravity, tidal force, turbulence, magnetic field, and galactic shear. Based on the 3D dust extinction map derived by Vergely et al., we identify a sample of 550 molecular clouds within 3 kpc of the solar vicinity in the Galactic disk. Our sample con…