IIA Institutional Repository: Recent submissions

  • Indigenous Development Software for the 90” Mirror coating plant, VBO 
    Arumugam, V (Indian Institute of Astrophysics, 2024-05-29)
    A Telescope is an instrument that aids in the observation of stellar and celestial objects. Mirrors are an important subsystem in the Telescope. Over a period, due to weathering effects, reflection efficiency of the mirrors ...
  • NTP Server and Weather Monitor for Kodaikanal Solar Observatory 
    Anand, M. N (Indian Institute of Astrophysics, 2024-05-29)
    We perceive time as a passage of events, a marker of change. In astronomy and astrophysics, we study events occurring over a short time (order of seconds) to long-term (a few years) variability. Accurate time stamping is ...
  • Forty Hypervelocity Stars from Gaia DR3 
    Parthasarathy, M (American Astronomical Society, 2024-04)
    Forty hypervelocity stars (HVS) are detected from a search for HVS in Gaia DR3 data whose G magnitudes are less than 17.0 and radial velocities are more +400 km s‑1. The Gaia DR3 astrophysical parameters and spectra indicate ...
  • A Selection of 23 Bright Hypervelocity Gaia DR3 Stars 
    Parthasarathy, M (American Astronomical Society, 2024-03)
    From the Gaia DR3 data twenty three bright hypervelocity stars that have Tycho catalogue numbers are presented. All these stars are of high galactic latitude and some may be galactic halo stars. All of them have accurate ...
  • A chemodynamical analysis of bright metal-poor stars from the HESP-GOMPA survey – indications of a non-prevailing site for light r-process elements 
    Bandyopadhyay, A; Beers, Timothy C; Ezzeddine, Rana; Sivarani, T; Nayak, Prasanta K; Pandey, Jeewan C; Saraf, Pallavi; Susmitha, A (Oxford University Press on behalf of Royal Astronomical Society, 2024-04)
    We present a comprehensive analysis of the detailed chemical abundances for a sample of 11 metal-poor, very metal-poor, and extremely metal-poor stars ([Fe/H] = −1.65 to [Fe/H] = −3.0) as part of the HESP-GOMPA (Galactic ...
  • Multiwavelength spectral modelling of the candidate neutrino blazar PKS 0735+178 
    Bharathan, Athira M; Stalin, C. S; Sahayanathan, S; Bhattacharyya, Subir; Mathew, Blesson (Oxford University Press on behalf of Royal Astronomical Society, 2024-04)
    The BL Lac object PKS 0735+178 was in its historic γ-ray brightness state during 2021 December. This period also coincides with the detection of a neutrino event IC 211208A, which was localized close to the vicinity of PKS ...
  • A comparative study of dust grain polarization efficiencies in the interstellar and intracluster mediums towards anticentre galaxy 
    Bijas, N; Eswaraiah, Chakali; Sandhyarani, Panigrahy; Jose, Jessy; Maheswar, G (Oxford University Press on behalf of Royal Astronomical Society, 2024-04)
    Dust polarization observations at optical wavelengths help understand the dust grain properties and trace the plane-of-the-sky component of the magnetic field. In this study, we make use of published optical polarization ...
  • CatNorth: An Improved Gaia DR3 Quasar Candidate Catalog with Pan-STARRS1 and CatWISE 
    Fu, Yuming; Wu, Xue-Bing; Li, Yifan; Pang, Yuxuan; Joshi, Ravi; Zhang, Shuo; Wang, Qiyue; Yang, Jing; Ng, FanLam; Liu, Xingjian; Qiu, Yu; Zhu, Rui; Wang, Huimei; Wolf, Christian; Zhang, Yanxia; Huo, Zhi-Ying; Ai, Y. L; Ma, Qinchun; Feng, Xiaotong; Bouwens, R. J (American Astronomical Society, 2024-04)
    A complete and pure sample of quasars with accurate redshifts is crucial for quasar studies and cosmology. In this paper, we present CatNorth, an improved Gaia Data Release 3 (Gaia DR3) quasar candidate catalog with more ...
  • Multi-Wavelength Study of Hot Stellar Populations in Galactic Globular Clusters 
    Deepthi, S. Prabhu (Indian Institute of Astrophysics, 2023-07)
    Galactic Globular clusters (GGCs) are old stellar systems (age ∼ 12 Gyr) consisting typically of about 104-106 gravitationally bound stars. This makes them excellent astrophysical laboratories to study stellar evolution, ...
  • Solving Cosmological Tensions with Neutrino Physics 
    Sharma, Ravi Kumar (Indian Institute of Astrophysics, 2023-11)
    The ΛCDM model is the most successful model of cosmology to fit most of the cosmological observations, yet a few discrepancies exist. There is a 4σ to 5σ mismatch in determining the Universe’s current expansion rate from ...
  • The Great North American Eclipse 2024 
    Kapoor, R. C. (NIScPR-CSIR, 2024-05)
    THE excitement about the total solar eclipse of 8 April 2024 in North America is unprecedented. Years before it was to pass, astronomers, educationists, students, the administrations and the local communities, and ...
  • Cloud–Cloud Collision and Cluster Formation in the W5-NW Complex 
    Issac, Namitha; Saha, Anindya; Choudhary, Saanika; Chaudhary, Aakash; Tej, Anandmayee; Liu, Hong-Li; Liu, Tie; Maheswar, G (American Astronomical Society, 2024-04-01)
    We present a detailed structural and gas kinematic study of the star-forming complex W5-NW. A cloud–cloud collision scenario unravels with evidence of collision-induced star and cluster formation. Various signatures of ...
  • Multi-wavelength photometric study of five contact binaries in the field of globular cluster M4 
    Devarapalli, Shanti Priya; Jagirdar, Rukmini; Pothuneni, Ravi Raja; Amente, Dereje Wakgari; Thomas, Vineet; Safonova, M; Brosch, Noah (Elsevier B.V, 2024-04)
    Binary stars are believed to be key determinants in understanding globular cluster evolution. In this paper, we present the Multi-band photometric analyses of five variables in the nearest galactic globular cluster M4, ...
  • SN 2020udy: A New Piece of the Homogeneous Bright Group in the Diverse Iax Subclass 
    Singh, Mridweeka; Sahu, D. K; Barna, Barnabas; Gangopadhyay, Anjasha; Dastidar, Raya; Teja, Rishabh Singh; Misra, Kuntal; Howell, D. Andrew; Wang, Xiaofeng; Mo, Jun; Yan, Shengyu; Hiramatsu, Daichi; Pellegrino, Craig; Anupama, G. C; Joshi, Arti; Bostroem, K. Azalee; Burke, Jamison; McCully, Curtis; Rama Subramanian, V; Li, Gaici; Xi, Gaobo; Li, Xin; Li, Zhitong; Srivastav, Shubham; Im, Hyobin; Dutta, Anirban (American Astronomical Society, 2024-04-10)
    We present optical observations and analysis of the bright type Iax supernova SN 2020udy hosted by NGC 0812. The evolution of the light curve of SN 2020udy is similar to that of other bright type Iax SNe. Analytical modeling ...
  • Disentangling the association of PAH molecules with star formation: Insights from the James Webb Space Telescope and from the UltraViolet Imaging Telescope 
    Ujjwal, Krishnan; Kartha, Sreeja S; Akhil, Krishna R; Mathew, Blesson; Subramanian, S; Sudheesh, T. P; Thomas, Robin (EDP Sciences, 2024-04)
    Context. Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous complex molecules in the interstellar medium and are used as an indirect indicator of star formation. On the other hand, the ultraviolet (UV) emission from ...
  • New Archives set up 
    The Hindu (The Hindu, 2009-11-30)
  • Reach for the sky - through a lens 
    The Times of Deccan (The Times of Deccan, 1982-09-09)
  • Bangalore's big leap into universe 
    The Times of Deccan (The Times of Deccan, 1982-09-09)
  • With Astrosat launch, ISRO scales new heights 
    Jesudasan, Dennis S (The Hindu, 2015-09-29)
  • A star party in the mountains 
    The Hindu (The Hindu, 2015-10-29)

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