Search Publications
Constraining the abundance of dark matter in the central region of the galaxy cluster MACS J1206.2-0847 with a free-form strong lensing analysis
Lam, Daniel; Diego, Jose M.; Herranz, Diego +1 more
We performed a free-form strong lensing analysis of the galaxy cluster MACS J1206.2-0847 in order to estimate and constrain its inner dark matter distribution. The free-form method estimates the cluster total mass distribution without using any prior information about the underlying mass. We used 97 multiple lensed images belonging to 27 backgroun…
86-GHz SiO masers in Galactic centre OH/IR stars
Messineo, Maria; Omont, Alain; Sjouwerman, Lorant O. +1 more
We present results on a search for 86.243-GHz SiO (J = 2→1, $v$ = 1) maser emission toward 67 OH/IR stars located near the Galactic centre. We detected 32 spectral peaks, of which 28 correspond to SiO maser lines arising from the envelopes of these OH/IR stars. In OH/IR stars, we obtained an SiO maser detection rate of about $40\%$ . We serendipit…
Comparing the Features of Generation of CMEs Moving with Different Speed in the Field of View of the LASCO Coronagraphs
Fainshtein, V. G.; Zagainova, Yu. S.
This study is aimed at finding an answer to the following question: are there any fundamental differences in the generation of coronal mass ejections (CMEs) with different speeds, especially low and high speeds, detected in the field of view of LASCO coronagraphs? Fast CMEs are conventionally understood as mass ejections with a linear projection v…
Water in the Star-forming Region NGC 7129 FIRS 2
Conrad, Mollie E.; Fich, Michel
Observations of intermediate mass (IM) star formation are expected to highlight the transition between the formation processes of its low and high-mass (HM) counterparts. ${{\rm{H}}}_{2}^{18}{\rm{O}}$ and ${{\rm{H}}}_{2}^{16}{\rm{O}}$ observations of the IM star formation region NGC 7129 FIRS 2 were obtained with the Heterodyne Instrument for the …
Study of open cluster King 13 using CCD VI, 2MASS and Gaia DR2 Astrometry.
Bisht, D.; Rangwal, Geeta; Yadav, R. K. S. +2 more
In this paper, we present astrophysical parameters of the open cluster King 13 based on the VI CCD and 2MASS JHKs photometric data. This is a poorly studied cluster, for which new results have been found in the present work. To identify probable members, we use proper motion data from Gaia DR2 catalogue. The mean proper motion of the cl…
Size of the smallest particles in Saturn's rings
Kimura, Hiroshi; Ohtsuki, Keiji; Hirata, Naoyuki +2 more
Spacecraft and ground-based observations have shown that particles in Saturn's main rings have a power-law distribution roughly between centimeter and ten meters, but sub-centimeter particles appear to be lacking. Recent studies based on Cassini observations suggest that the minimum particle size is on the order of millimeters, although their abun…
Integrated approach to the PDR/H II complex by the application of carbon radio recombination lines in the millimetre range and fine-structure lines of C II and O I
Siddiqui, S. A.; Khan, Shafiqullah; Qaiyum, A.
We have performed self-consistent calculations to estimate the physical parameters of photodissociation regions (PDRs) associated with objects, namely, NGC 2024, Orion A and W3, using far-infrared continuum emission, fine-structure lines of C II and O I, and radio recombination lines of carbon. Typically, PDRs separate H II regions from the molecu…
Coupling Mars Ground and Orbital Views: Generate Viewsheds of Mastcam Images From the Curiosity Rover, Using ArcGIS® and Public Datasets
Stein, N.; Nachon, M.; Borges, S. +3 more
The Mastcam (Mast Camera) instrument onboard the NASA Curiosity rover provides an exclusive view of Mars: High-resolution color images from Mastcam allow users to study Gale crater's geologic terrains along Curiosity's path. These ground observations complement the spatially broader views of Gale crater provided by spacecrafts from orbit. However,…
Serendipitous Discovery of a Physical Binary Quasar at z = 1.76
Geier, S.; Fynbo, J. P. U.; Heintz, K. E. +7 more
Binary quasars are extremely rare objects, used to investigate clustering on very small scales at different redshifts. The cases where the two quasar components are gravitationally bound, known as physical binary quasars, can also exhibit enhanced astrophysical activity and therefore are of particular scientific interest. Here we present the seren…
Investigating the Physical Conditions in Extended System Hosting Mid-infrared Bubble N14
Dewangan, L. K.; Ojha, D. K.; Baug, T. +1 more
To observationally explore physical processes, we present a multiwavelength study of a wide-scale environment toward l = 13°7-14°9 containing a mid-infrared bubble N14. The analysis of 12CO, 13CO, and C18O gas at [31.6, 46] km s-1 reveals an extended physical system (extension ∼59 pc × 29 pc), which host…