Search Publications
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…
Tentative detection of the circumgalactic medium of the isolated low-mass dwarf galaxy WLM
McQuinn, Kristen B. W.; Lockman, Felix J.; Fox, Andrew J. +7 more
We report a tentative detection of the circumgalactic medium (CGM) of Wolf-Lundmark-Melotte (WLM), an isolated, low-mass (logM*/M⊙ ≈ 7.6), dwarf irregular galaxy in the Local Group (LG). We analyse an HST/COS archival spectrum of a quasar sightline (PHL2525), which is 45 kpc (0.5 virial radius) from WLM and close to the Magel…
Co-spatial UV-optical HST/STIS spectra of six planetary nebulae: nebular and stellar properties
Corradi, Romano L. M.; Balick, Bruce; Shaw, Richard A. +4 more
This paper represents the conclusion of a project that had two main goals: (1) to investigate to what extent planetary nebulae (PNe) are chemically homogeneous; and (2) to provide physical constraints on the central star properties of each PN. We accomplished the first goal by using HST/STIS spectra to measure the abundances of seven elements in n…
A combined X-ray, optical, and radio view of the merging galaxy cluster MACS J0417.5-1154
Simionescu, A.; Limousin, M.; Raychaudhury, S. +3 more
We present a comprehensive multiwavelength analysis of the merging galaxy cluster MACS J0417.5-1154 at a redshift of z = 0.44, using available images red obtained with Chandra in X-ray, Subaru, Hubble Space Telescope (HST) in optical, Giant Metrewave Radio Telescope (GMRT) in radio, and Bolocam at 2.1 mm wavelength. This is an example of a complex…
Evidence of New Magnetic Transitions in Late-type Dwarfs from Gaia DR2
Spada, Federico; Distefano, Elisa; Lanzafame, Alessandro C. +1 more
The second Gaia data release contains the identification of 147,535 low-mass (≲ 1.4 {M}⊙ ) rotational modulation variable candidates on (or close to) the main sequence, together with their rotation period and modulation amplitude. The richness, the period and amplitude range, and the photometric precision of this sample make it possible…
Thermal Emission and Magnetic Beaming in the Radio and X-Ray Mode-switching PSR B0943+10
Mereghetti, Sandro; Turolla, Roberto; Potekhin, Alexander Y. +3 more
PSR B0943+10 is a mode-switching radio pulsar characterized by two emission modes with different radio and X-ray properties. Previous studies, based on simple combinations of blackbody and power-law models, showed that its X-ray flux can be decomposed in a pulsed thermal plus an unpulsed nonthermal components. However, if PSR B0943+10 is a nearly …