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Hidden IR structures in NGC 40: signpost of an ancient born-again event
Guerrero, M. A.; Toalá, J. A.; Todt, H. +1 more
We present the analysis of infrared (IR) observations of the planetary nebula NGC 40 together with spectral analysis of its [WC]-type central star HD 826. Spitzer IRS observations were used to produce spectral maps centred at polycyclic aromatic hydrocarbons (PAH) bands and ionic transitions to compare their spatial distribution. The ionic lines s…
Line Profiles of the Calcium I Resonance Line in Cool Metal-polluted White Dwarfs
Dufour, P.; Allard, N. F.; Blouin, S. +2 more
Metal-polluted white dwarfs (DZ stars) are characterized by a helium-rich atmosphere contaminated by heavy elements traces originating from accreted rocky planetesimals. As a detailed spectroscopic analysis of those objects can reveal the composition of the accreted debris, there is a great interest in developing accurate DZ atmosphere models. How…
Bok globule CB 17: polarization, extinction and distance
Medhi, B. J.; Das, H. S.; Choudhury, G. B. +1 more
In this article, the results obtained from a polarimetric study of Bok globule CB 17 in both optical and submillimetre wavelengths are presented. Optical polarimetric observations in the R band (λ = 630 nm, Δλ = 120 nm) were conducted with the 1.04-m Sampurnanand Telescope, Aryabhatta Research Institute of observational sciencES (ARIES), in Nainit…
Moving Groups as the Origin of the Vertical Phase Space Spiral in the Solar Neighborhood
Pérez-Villegas, Angeles; Barros, Douglas A.; Michtchenko, Tatiana A. +1 more
Using Gaia data release 2 (DR2), we analyzed the distribution of stars in the close vicinity of the Sun in the full 3D position-velocity space. We have found no evidence of incomplete phase mixing in the vertical direction of the disk, which could have originated from external events. We show that the vertical phase-space spiral Z-V z …
Merging cold front and AGN feedback in the peculiar galaxy cluster Abell 2626
Pawar, P. K.; Sonkamble, S. S.; Patil, M. K. +1 more
This paper presents the analysis of combined 134 ks Chandra data of a peculiar galaxy cluster Abell 2626. This study confirms the earlier detection of the east cavity at ∼13 kpc and reports the detection of a new cavity at ∼39 kpc to the west of the X-ray peak. The average mechanical power injected by the active galactic nucleus outburst P_cav ∼ 6…
Haumea's thermal emission revisited in the light of the occultation results
Fornasier, S.; Lellouch, E.; Marton, G. +9 more
A recent multi-chord occultation measurement of the dwarf planet (136108) Haumea (Ortiz et al., 2017) revealed an elongated shape with the longest axis comparable to Pluto's mean diameter. The chords also indicate a ring around Haumea's equatorial plane, where its largest moon, Hi'iaka, is also located. The Haumea occultation size estimate (size o…
2 mm GISMO Observations of the Galactic Center. I. Dust Emission
Morris, Mark R.; Staguhn, Johannes; Gonzalez-Quiles, Junellie +5 more
The central molecular zone, covering the inner ∼1° of the Galactic plane has been mapped at 2 mm using the Goddard-IRAM Superconducting 2-Millimeter Observer (GISMO) bolometric camera on the 30 m IRAM telescope. The 21″ resolution maps show abundant emission from cold molecular clouds, from star-forming regions, and from one of the Galactic center…
Characterizing dynamical stages of open clusters located in the Sagittarius spiral arm
Maia, F. F. S.; Angelo, M. S.; Dias, W. S. +1 more
The study of dynamical properties of Galactic open clusters (OCs) is a fundamental prerequisite for the comprehension of their dissolution processes. In this work, we characterized 12 OCs, namely: Collinder 258, NGC 6756, Czernik 37, NGC 5381, Ruprecht 111, Ruprecht 102, NGC 6249, Basel 5, Ruprecht 97, Trumpler 25, ESO 129-SC32, and BH 150, projec…
Hunting for brown dwarfs in the globular cluster M4: second epoch HST NIR observations
Knigge, C.; Bedin, L. R.; Rich, R. M. +5 more
We present an analysis of the second epoch Hubble Space TelescopeWide Field Camera 3 F110W near-infrared (NIR) imaging data of the globular cluster M 4. The new data set suggests that one of the previously suggested four brown dwarf candidates in this cluster is indeed a high-probability cluster member. The position of this object in the NIR colou…
Neutron Stars and Black Holes in the Small Magellanic Cloud: The SMC NuSTAR Legacy Survey
Haberl, F.; Lehmer, B. D.; Hornschemeier, A. E. +18 more
We present a source catalog from the first deep hard X-ray (E > 10 keV) survey of the Small Magellanic Cloud (SMC), the Nuclear Spectroscopic Telescope Array (NuSTAR) Legacy Survey of the SMC. We observed three fields, for a total exposure time of 1 Ms, along the bar of this nearby star-forming galaxy. Fields were chosen for their young stellar…