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Browsing IIAP Publications by Title

Browsing IIAP Publications by Title

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  • Aligning and phasing segmented mirror telescope with the pyramid sensor 
    Jacob, A; Parihar, P; Sindhu, Divakaran; James, Melvin.K (SPIE--The International Society for Optical Engineering, 2018-07)
    Alignment and Phasing system (APS) is one of essential device for any segmented mirror telescope. It helps to align and phase mirror segments, so that all together they works like a monolithic surface. Over last two years ...
  • All sky scanning cloud monitor for NLOT site survey 
    Sharma, T. K; Parihar, P. S; Kemkar, P. M. M (IOP Publishing, 2015-05)
    Monitoring local sky for the cloud is one of important task before setting-up a new observatory. Here we present the design, implementation and initial results of a scanning type cloud monitor developed in Indian Institute ...
  • Alleviating the H0 and σ8 anomalies with a decaying dark matter model 
    Pandey, Kanhaiya L; Karwal, Tanvi; Das, Subinoy (IOP Publishing, 2020-07)
    The Hubble tension between the ΛCDM-model-dependent prediction of the current expansion rate H0 using Planck data and direct, model-independent measurements in the local universe from the SH0ES collaboration disagree at ...
  • ALMA Survey of Orion Planck Galactic Cold Clumps (ALMASOP): A Hot Corino Survey toward Protostellar Cores in the Orion Cloud 
    Hsu, Shih-Ying; Liu, Sheng-Yuan; Liu, Tie; Sahu, Dipen; Lee, Chin-Fei; Tatematsu, Kenichi; Kim, Kee-Tae; Hirano, Naomi; Yang, Yao-Lun; Johnstone, Doug; Liu, Hongli; Juvela, Mika; Bronfman, Leonardo; Chen, Huei-Ru Vivien; Dutta, Somnath; Eden, David J; Jhan, Kai-Syun; Kuan, Yi-Jehng; Lee, Chang Won; Lee, Jeong-Eun; Li, Shanghuo; Liu, Chun-Fan; Qin, Sheng-Li; Sanhueza, Patricio; Shang, Hsien; Archana Soam; Traficante, Alessio; Zhou, Jianjun (American Astronomical Society, 2022-03-10)
    The presence of complex organic molecules (COMs) in the interstellar medium is of great interest since it may link to the origin and prevalence of life in the universe. Aiming to investigate the occurrence of COMs and their ...
  • Almahata Sitta meteorite: gamma -activity measurements at Monte dei Cappuccini Laboratory in Torino 
    Taricco, C; Bhandari, N; Colombetti, P; Romero, A; Vivaldo, G; Sinha, N; Jenniskens, P; Shaddad, M. H (Societa Astronomica Italiana, 2012)
    The asteroid 2008 TC3 was telescopically seen prior to entering Earth’s atmosphere and was predicted to fall in Sudan on October 7, 2008, as it actually happened. Subsequently, many fragments were collected from the Nubian ...
  • The ALMaQUEST Survey. VII. Star Formation Scaling Relations of Green Valley Galaxies 
    Lin, Lihwai; Ellison, Sara L; Pan, Hsi-An; Thorp, Mallory D; Yu, Po-Chieh; Belfiore, Francesco; Hsieh, Bau-Ching; Maiolino, Roberto; Ramya, S; Sanchez, Sebastian F; Su, Yung-Chau (American Astronomical Society, 2022-02-20)
    We utilize the ALMA-MaNGA QUEnch and STar formation (ALMaQUEST) survey to investigate the kpc-scale scaling relations, presented as the resolved star-forming MS (rSFMS: ΣSFR versus Σ*), the resolved Schmidt–Kennicutt ...
  • The ALMaQUEST Survey: The Molecular Gas Main Sequence and the Origin of the Star-forming Main Sequence 
    Lin, Lihwai; Pan, Hsi-An; Ellison, Sara L; Belfiore, Francesco; Shi, Yong; Sánchez, Sebastián F; Hsieh, Bau-Ching; Rowlands, Kate; Ramya, S; Thorp, Mallory D; Li, Cheng; Maiolino, Roberto (IOP Publishing, 2019-10-20)
    The origin of the star-forming main sequence (SFMS; i.e., the relation between star formation rate and stellar mass, globally or on kpc scales) remains a hotly debated topic in galaxy evolution. Using the ALMA-MaNGA QUEnching ...
  • Alpha effect in partially ionized plasmas 
    Krishan, V; Gangadhara, R. T (Springer Netherlands, 2008)
    There are several astrophysical situations where one needs to study the dynamics of magnetic flux in partially ionized turbulent plasmas. In a partially ionized plasma the magnetic induction is subjected to the ambipolar ...
  • Alternate Models to Dark Energy 
    Arun, K; Gudennavar, S. B; Prasad, A; Sivaram, C (Elsevier B.V, 2018-01)
    One of the unresolved questions currently in cosmology is that of the non-linear accelerated expansion of the universe. This has been attributed to the so called Dark Energy (DE). The accelerated expansion of the universe ...
  • Altitude and azimuth of the Sun 
    Ganguly, S. R (Indian Meteorological Department, 1954-01)
  • Ambipolar diffusion in the solar atmosphere 
    Chitre, S. M; Krishan, V (Royal Astronomical Society, 2001-05)
    The process of non-linear ambipolar diffusion in the region overlying the solar surface can be an effective mechanism for producing sharp magnetic structures and current sheets. These may be the sites responsible for the ...
  • Amplitude of solar wind density turbulence from 10 to 45 R⊙ 
    Sasikumar Raja, K; Ingale, M; Ramesh, R; Subramanian, P; Manoharan, P. K; Janardhan, P (American Geophysical Union, 2016-12)
    We report on the amplitude of the density turbulence spectrum ( urn:x-wiley:jgra:media:jgra53108:jgra53108-math-0001) and the density modulation index (δN/N) in the solar wind between 10 and 45R⊙. We derive these quantities ...
  • The Amplitude of Sunspot Minimum as a Favorable Precursor for the Prediction of the Amplitude of the Next Solar Maximum and the Limit of the Waldmeier Effect 
    Ramesh, K. B; Lakshmi, N. B (Springer, 2012-02)
    The linear relationship between the maximum amplitudes (R max) of sunspot cycles and preceding minima (R min) is one of the precursor methods used to predict the amplitude of the upcoming solar cycle. In the recent past ...
  • An Analog System for Fast Light Curve Registration 
    Bhattacharyya, J. C; Sundareswaran. A (Indian Institute of Astrophysics, Bangalore, 1977)
    An electronic system for recording fast light curves is described. The system employs a two track magnetic tape recorder for intermediate storage of photometer and time signals and reproduces these on cathode ray oscilloscope ...
  • Analysing Solar‐like Oscillations with an Automatic Pipeline 
    Mathur, S; Garcia, R. A; Regulo, C; Ballot, J; Salabert, D; Chaplin, W. J (American Institute of Physics, 2009)
    The Kepler mission will provide a huge amount of asteroseismic data during the next few years, among which hundreds of solar‐like stars will be targeted. The amount of stars and their observation length represent a step ...
  • Analysing the effects of apodizing windows on local correlation tracking using nirvana simulations of convection 
    Louis, R. E; Ravindra, B; Georgoulis, M. K; Kuker, M (Springer, 2015-04)
    We employ different shapes of apodizing windows in the local correlation tracking (LCT) routine to retrieve horizontal velocities using numerical simulations of convection. LCT was applied on a time sequence of temperature ...
  • Analysis of a fragmenting sunspot using hinode observations 
    Louis, R. E; Ravindra, B; Mathew, S. K; Bellot Rubio, L. R; Bayanna, A. R; Venkatakrishnan, P (IOP Publishing, 2012-08-10)
    We employ high-resolution filtergrams and polarimetric measurements from Hinode to follow the evolution of a sunspot for eight days starting on 2007 June 28. The imaging data were corrected for intensity gradients, projection ...
  • Analysis of absorption lines in the high-resolution spectra of five hot post-AGB candidates 
    Herrero, A; Parthasarathy, M; Simon-Diaz, S; Hubrig, S; Sarkar, G; Muneer, S (Oxford University Press on behalf of the Royal Astronomical Society, 2020-05)
    From an analysis of absorption lines in the high-resolution spectra, we have derived the radial velocities, stellar parameters (Teff, log g, wind-strength parameter log Q, and projected rotational velocity), and abundances ...
  • An analysis of Babinet compensator fringes using Jones calculus 
    Pandya, T. P; Saxena, A. K (Indian Institute of Astrophysics, 1978)
    Following Jones Calculus, a comprehensive theory of the Babinet Compensator has been presented. The performance of the system governed by the compensator-Polaroid unit, has been evaluated in terms of fringe visibility. ...
  • Analysis of BMR Tilt from AutoTAB Catalog: Hinting toward the Thin Flux Tube Model? 
    Sreedevi, Anu; Jha, Bibhuti K; Karak, Bidya Binay; Banerjee, D (American Astronomical Society, 2024-05-01)
    One of the intriguing mechanisms of the Sun is the formation of bipolar magnetic regions (BMRs) in the solar convection zone (CZ), which are observed as regions of concentrated magnetic fields of opposite polarity on ...

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