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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…
Using the Modified Lognormal Power-law Distribution to Model the Mass Function of NGC 1711
Basu, Shantanu; Madaan, Deepakshi; Lianou, Sophia
A determination of the mass function (MF) of stellar clusters can be quite dependent on the range of measured masses, the fitting technique, and the analytic function that is being fit to the data. Here, we use Hubble Space Telescope/WFPC2 data of NGC 1711, a stellar cluster in the Large Magellanic Cloud, as a test case to explore a range of possi…
A search for supernova light echoes in NGC 6946 with SITELLE
Welch, D. L.; Radica, M. C.; Rousseau-Nepton, L.
We present the analysis of 4 h of spectroscopic observations of NGC 6946 with the SITELLE Imaging Fourier Transform Spectrometer on the Canada-France-Hawaii Telescope, acquired to search for supernova light echoes from its 10 modern supernovae. We develop a novel spectroscopic search method: identifying negatively sloped continua in the narrow-ban…
A Photometric Study of the Contact Binary GR Piscium
Michaels, E. J.
High-quality CCD photometric light curves of the eclipsing binary GR Psc are presented. The new multicolor light curves display total eclipses which were analyzed using the Wilson-Devinney program. The light curve solution describes the system as a contact configuration with a mass ratio of M2 / M1 = 0.431, a fill-out of f = 47%, and a small tempe…
Pixel-based Spectral Characterization of Mid-infrared Si Array Detectors for Astronomical Observations in Space
Kaneda, Hidehiro; Ishihara, Daisuke; Wada, Takehiko +2 more
Mid-infrared (IR) array detectors have been used for astronomical observations in space. However, the uniformities of their spectral response curves have not been investigated in detail, the understanding of which is important for spectroscopic observations using large array formats. We characterize the spectral responses of all the pixels in IR a…
Multiwavelength Analysis of the Kinematics of a Long Duration Flare-CME Event on 27 January 2012
Shanmugaraju, A.; Suresh, K.; Selvarani, G. +1 more
We present a detailed analysis of a long-duration flare associated with a coronal mass ejection (CME) event that occurred on 27 January 2012 in the active region (AR) 11402. We analyze the kinematics of the CME and the close relationship between the flare, radio burst, and CME. We used STEREO (Solar Terrestrial Relations Observatory)/EUVI A (Extre…
Multi-wavelength study in the region of IRAS 16571-4029 and 16575-4023 sources
Baume, G.; Borissova, J.; Ramirez Alegria, S. +2 more
We studied the stellar populations and their associated interstellar medium structures located in the region of IRAS 16571-4029 and 16575-4023 sources, aiming to evaluate their distance and their main physical parameters. We focused our attention on the embedded cluster DBS 113 and its associated HII region RCW 116B.
For the study, optical im…