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High spatial resolution of the mid-infrared emission of the Compton-thick type 2 Seyfert galaxy, Markarian 3
Pastoriza, M. G.; Winge, Cláudia; Sales, Dinalva A. +2 more
The mid-infrared (MIR) spectra observed with Gemini/Michelle have been used to study the nuclear region of the Compton-thick type 2 Seyfert galaxy, Markarian 3 (Mrk 3), at a spatial resolution of ∼200 pc. No polycyclic aromatic hydrocarbon emission bands were detected in the N-band spectrum of Mrk 3. However, intense [Ar III] 8.99 µm, [S IV]…
An initial investigation of the long-term trends in the fluxgate magnetometer (FGM) calibration parameters on the four Cluster spacecraft
Carr, C. M.; Brown, P.; Oddy, T. M. +3 more
Over the course of more than 10 years in operation, the calibration parameters of the outboard fluxgate magnetometer (FGM) sensors on the four Cluster spacecraft are shown to be remarkably stable. The parameters are refined on the ground during the rigorous FGM calibration process performed for the Cluster Active Archive (CAA). Fluctuations in som…
The Temperature of Quiescent Streamers during Solar Cycles 23 and 24
Landi, E.; Testa, P.
Recent in-situ determinations of the temporal evolution of the charge state distribution in the fast and slow solar wind have shown a general decrease in the degree of ionization of all the elements in the solar wind along solar cycles 23 and 24. Such a decrease has been interpreted as a cooling of the solar corona which occurred during the declin…
Probing large-scale structure with large samples of X-ray selected AGN. I. Baryonic acoustic oscillations
Sunyaev, Rashid; Gilfanov, Marat; Hütsi, Gert +1 more
We investigate the potential of large X-ray-selected AGN samples for detecting baryonic acoustic oscillations (BAO). Though AGN selection in X-ray band is very clean and efficient, it does not provide redshift information, and thus needs to be complemented with an optical follow-up. The main focus of this study is (i) to find the requirements need…
A New Catalog of Silicate Carbon Stars
Suh, Kyung-Won; Kwon, Young-Joo
Application of the Baade-Wesselink method to a pulsating cluster Herbig Ae star: H254 in IC348
Ripepi, V.; Molinaro, R.; Palla, F. +6 more
In this paper we present new photometric and radial velocity data for the PMS δ Sct star H254, member of the young cluster IC 348. Photometric V, RC, IC light curves were obtained at the Loiano and Asiago telescopes. The radial velocity data were acquired by means of the SARG@Telescopio Nazionale Galileo spectrograph. High-re…
Segmentation of coronal features to understand the solar EUV and UV irradiance variability
Chitta, L. P.; Verbeeck, C.; Giono, G. +8 more
Context. The study of solar irradiance variability is of great importance in heliophysics, the Earth's climate, and space weather applications. These studies require careful identifying, tracking and monitoring of active regions (ARs), coronal holes (CHs), and the quiet Sun (QS).
Aims: We studied the variability of solar irradiance for a peri…
A Photon-dominated Region Model for the FIR Mid-J CO Ladder with Universal Rotational Temperature in Star Forming Regions
Lee, Jeong-Eun; Bergin, Edwin A.; Lee, Seokho +1 more
A photon-dominated region (PDR) is one of the leading candidate mechanisms for the origin of warm CO gas with near universal ~300 K rotational temperature inferred from the CO emission detected toward embedded protostars by Herschel/PACS. We have developed a PDR model in general coordinates, where we can use the most adequate coordinate system for…
Phase resolved X-ray spectroscopy of HDE 228766: Probing the wind of an extreme Of+/WNLha star
Nazé, Y.; Rauw, G.; Manfroid, J. +3 more
Context. HDE 228766 is a very massive binary system hosting a secondary component, which is probably in an intermediate evolutionary stage between an Of supergiant and an WN star. The wind of this star collides with the wind of its O8 II companion, leading to relatively strong X-ray emission.
Aims: Measuring the orbital variations of the line…
Blue Straggler Star Populations in Globular Clusters. I. Dynamical Properties of Blue Straggler Stars in NGC 3201, NGC 6218, and ω Centauri
Puzia, Thomas H.; Simunovic, Mirko
We present the first dynamical study of blue straggler stars (BSSs) in three Galactic globular clusters, NGC 3201, NGC 5139 (ω Cen), and NGC 6218, based on medium-resolution spectroscopy (R ≈ 10, 000) obtained with the Inamori-Magellan Areal Camera & Spectrograph mounted at the 6.5 m Baade Magellan telescope. Our BSS candidate selection techni…