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The XMM-Newton/HST View of the Obscuring Outflow in the Seyfert Galaxy Mrk 335 Observed at Extremely Low X-Ray Flux
Komossa, S.; Mathur, Smita; Krongold, Yair +8 more
The Seyfert galaxy Mrk 335 is known for its frequent changes of flux and spectral shape in the X-ray band that occurred during recent years. These variations may be explained by the onset of a wind that previous, noncontemporaneous high-resolution spectroscopy in X-ray and UV bands located at accretion disk scale. A simultaneous new campaign by XM…
Discrepancies in the ages of young star clusters; evidence for mergers?
Smith, Nathan; Bastian, Nate; Beasor, Emma R. +1 more
There is growing evidence that star clusters can no longer be considered simple stellar populations. Intermediate- and old-age clusters are often found to have extended main-sequence turn-offs (eMSTOs) which are difficult to explain with single-age isochrones, an effect attributed to rotation. In this paper, we provide the first characterization o…
X-ray dips and a complex UV/X-ray cross-correlation function in the black hole candidate MAXI J1820+070
Sanna, A.; Motta, S. E.; Segreto, A. +3 more
MAXI J1820+070, a black hole candidate first detected in early 2018 March, was observed by XMM-Newton during the outburst rise. In this letter we report on the spectral and timing analysis of the XMM-Newton X-ray and UV data, as well as contemporaneous X-ray data from the Swift satellite. The X-ray spectrum is well described by a hard thermal Comp…
Discovery of disc truncations above the galaxies' mid-plane in Milky Way-like galaxies
Trujillo, Ignacio; Knapen, Johan H.; Martínez-Lombilla, Cristina
Disc truncations are the closest feature to an edge that galaxies have, but the nature of this phenomenon is not yet understood. In this paper we explore the truncations in two nearby (D ∼15 Mpc) Milky Way-like galaxies: NGC 4565 and NGC 5907. We cover a wide wavelength range from the NUV and optical to 3.6 {µ m}. We find that the radius of …
WISDOM project - IV. A molecular gas dynamical measurement of the supermassive black hole mass in NGC 524
Sarzi, Marc; Cappellari, Michele; Davis, Timothy A. +6 more
We present high angular resolution (0.3 arcsec or 37 pc) Atacama Large Millimeter/submillimeter Array observations of the CO(2-1) line emission from a central disc in the early-type galaxy NGC 524. This disc is shown to be dynamically relaxed, exhibiting ordered rotation about a compact 1.3 mm continuum source, which we identify as emission from a…
The Physical Origins of the Identified and Still Missing Components of the Warm-Hot Intergalactic Medium: Insights from Deep Surveys in the Field of Blazar 1ES1553+113
Johnson, Sean D.; Drout, Maria R.; Chen, Hsiao-Wen +11 more
The relationship between galaxies and the state/chemical enrichment of the warm-hot intergalactic medium (WHIM) expected to dominate the baryon budget at low-z provides sensitive constraints on structure formation and galaxy evolution models. We present a deep redshift survey in the field of 1ES1553+113, a blazar with a unique combination of ultra…
Late-time observations of the extraordinary Type II supernova iPTF14hls
Cenko, S. B.; Sollerman, J.; Gal-Yam, A. +22 more
Aims: We study iPTF14hls, a luminous and extraordinary long-lived Type II supernova, which lately has attracted much attention and disparate interpretation.
Methods: We have presented new optical photometry that extends the light curves up to more than three years past discovery. We also obtained optical spectroscopy over this period, an…
The Physics of the Accelerating Universe Camera
Carretero, Jorge; Castander, Francisco J.; Eriksen, Martin +30 more
The Physics of the Accelerating Universe (PAU) Survey goal is to obtain photometric redshifts (photo-z) and spectral energy distributions (SEDs) of astronomical objects with a resolution roughly one order of magnitude better than current broadband (BB) photometric surveys. To accomplish this, a new large field-of-view (FoV) camera (PAUCam) has bee…
Detection of a giant flare displaying quasi-periodic pulsations from a pre-main-sequence M star by the Next Generation Transit Survey
Jackman, James A. G.; Wheatley, Peter J.; Raddi, Roberto +18 more
We present the detection of an energetic flare on the pre-main-sequence M3 star NGTS J121939.5-355557, which we estimate to be only 2 Myr old. The flare had an energy of 3.2± ^{0.4}_{0.3}× 10^{36} erg and a fractional amplitude of 7.2 ± 0.8, making it one of the most energetic flares seen on an M star. The star is also X-ray active, in the saturat…
Background for a gamma-ray satellite on a low-Earth orbit
Hernanz, M.; Cumani, P.; Kiener, J. +2 more
The different background components in a low-Earth orbit have been modeled in the 10 keV to 100 GeV energy range. The model is based on data from previous instruments and it considers both primary and secondary particles, charged particles, neutrons and photons. The necessary corrections to consider the geomagnetic cutoff are applied to calculate …