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140 results on '"Safonova, Margarita"'

109. SN 2013ej: A TYPE IIL SUPERNOVA WITH WEAK SIGNS OF INTERACTION

Author

Bose, Subhash, primary, Sutaria, Firoza, additional, Kumar, Brijesh, additional, Duggal, Chetna, additional, Misra, Kuntal, additional, Brown, Peter J., additional, Singh, Mridweeka, additional, Dwarkadas, Vikram, additional, York, Donald G., additional, Chakraborti, Sayan, additional, Chandola, H. C., additional, Dahlstrom, Julie, additional, Ray, Alak, additional, and Safonova, Margarita, additional

Published
2015
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111. A Raspberry Pi-Based Attitude Sensor

Author

Sreejith, A. G., primary, Mathew, Joice, additional, Sarpotdar, Mayuresh, additional, Mohan, Rekhesh, additional, Nayak, Akshata, additional, Safonova, Margarita, additional, and Murthy, Jayant, additional

Published
2014
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112. Prospect for UV observations from the Moon

Author

Safonova, Margarita, primary, Mathew, Joice, additional, Mohan, Rekhesh, additional, Sreejith, A. G., additional, Murthy, Jayant, additional, Brosch, Noah, additional, Kappelmann, Norbert, additional, Sharma, Arpit, additional, and Narayan, Rahul, additional

Published
2014
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114. PIONS: a CubeSat imager to observe variable UV sources

Author

den Herder, Jan-Willem A., Nikzad, Shouleh, Nakazawa, Kazuhiro, Ambily, S., Mathew, Joice, Sarpotdar, Mayuresh, Murthy, Jayant, Aggarval, V. K., Nagabhushanam, S., Rao, Divya A., Jeeragal, Sachin, Nirmal, Kaipachery, Sreejith, A. G., Gopalakrishnan, Binukumar, and Safonova, Margarita

Published
2018
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115. Opto-mechanical assembly and ground calibration of LUCI

Author

den Herder, Jan-Willem A., Nikzad, Shouleh, Nakazawa, Kazuhiro, Mathew, Joice, Nair, B. G., Sriram, S., Kamath, P. U., Prakash, Ajin, Sarpotdar, Mayuresh, Ambily, S., K., Nirmal, Sreejith, A. G., Safonova, Margarita, Murthy, Jayant, and Brosch, Noah

Published
2018
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130. Extrapolating SMBH correlations down the mass scale: the case for IMBHs in globular clusters.

Author

Safonova, Margarita and Shastri, Prajval

Subjects
STELLAR mass, SUPERMASSIVE black holes, SUPERMASSIVE stars, GALACTIC bulges, GLOBULAR clusters, DISPERSION (Chemistry), EXTRAPOLATION
Abstract

Empirical evidence for both stellar mass black holes ( M•<102 M⊙) and supermassive black holes (SMBHs, M•>105 M⊙) is well established. Moreover, every galaxy with a bulge appears to host a SMBH, whose mass is correlated with the bulge mass, and even more strongly with the central stellar velocity dispersion σ c, the M•– σ relation. On the other hand, evidence for “intermediate-mass” black holes (IMBHs, with masses in the range 100–105 M⊙) is relatively sparse, with only a few mass measurements reported in globular clusters (GCs), dwarf galaxies and low-mass AGNs. We explore the question of whether globular clusters extend the M•– σ relationship for galaxies to lower black hole masses and find that available data for globular clusters are consistent with the extrapolation of this relationship. We use this extrapolated M•– σ relationship to predict the putative black hole masses of those globular clusters where existence of central IMBH was proposed. We discuss how globular clusters can be used as a constraint on theories making specific predictions for the low-mass end of the M•– σ relation. [ABSTRACT FROM AUTHOR]

Published
2010
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131. TAUVEX flight calibrations: Plans and challenges.

Author

Safonova, Margarita, Shalima, P., and Murthy, Jayant

Subjects
*CALIBRATION, *SPACE telescopes, *ULTRAVIOLET photometry, *ASTRONOMICAL photometry
Abstract

The operational tasks for the Performance Verification (PV) and calibration phase in the first year of TAUVEX operation are presented. The new challenges regarding the possible reduction in sensitivity are outlined and are reflected in the specialized plan for first few months of the mission. The calibration operations will be extended into the first year, in parallel to an unprecedented deep exposure of the celestial poles. The preliminary zero-points of the instrumental photometric system, in AB and Vega-based magnitude systems, are calculated for pre-ground calibrations data as well as for the updated results. For flux calibration, the effective wavelengths, bandwidths and conversion factors are calculated for both pre-ground and updated values. These conversion factors are to be used for converting the TAUVEX count rates to flux and UV luminosity of the sources. [ABSTRACT FROM AUTHOR]

Published
2009

133. An Overview of High-Altitude Balloon Experiments at the Indian Institute of Astrophysics

Author

Safonova, Margarita, Nayak, Akshata, Sreejith, A. G., Mathew, Joice, Sarpotdar, Mayuresh, Ambily, S., Nirmal, K., Talnikar, Sameer, Hadigal, Shripathy, Prakash, Ajin, and Jayant Murthy

Subjects
FOS: Physical sciences, Astrophysics - Instrumentation and Methods for Astrophysics, Instrumentation and Methods for Astrophysics (astro-ph.IM)
Abstract

We have initiated the High-Altitude Ballooning programme at Indian Institute of Astrophysics, Bangalore, in the year 2011 with the primary purpose of developing and flying low-cost scientific payloads on a balloon-borne platform. The main aim is the observations of extended nearby objects (e.g. comets) and of diffuse sources (e.g. zodiacal light or airglow) with wide field of view (FOV) UV instruments from near space (20 to 30 km). A brief summary and the results of the tethered flights carried out at IIA CREST campus are given in Ref.~1. Here we present an overview of the nine free-flying balloon experiments conducted from March 2013 to November 2014. We describe the launch procedures, payloads, methods of tracking and recovery. Since we fall in the light balloon category --- payload weight is limited to less than 6 kg --- we use the 3-D printer to fabricate lightweight boxes and structures for our experiments. We discuss the flight and scientific data obtained from different launches and the development of the in-house lightweight sensors and controllers, as well as a fully-fledged 2-axis pointing and stabilization system, for the flights., 21 pages, 33 Figures

134. CHAPTER IX: NEW MEMBERS AND DECEASED MEMBERS PRESENTED AT THE GENERAL ASSEMBLY.

Subjects
DEAD, PERSONAL names
Abstract

The article focuses on the report of the IAU Membership Committee for the 2015–2018 triennium, detailing statistics and processes related to membership applications. Topics include the composition of the committee, the number of applications received, and the transfer process between Individual and Junior Memberships.

Published
2023
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139. Lies of Omission : Algorithms Versus Democracy

Author

Catherine DeSoto and Catherine DeSoto

Abstract

A lie of omission—withholding needed information to correct a false belief. There is a sharp and more hostile divide emerging in the United States. The shift is documented by various polls, and the speed of the change is alarming. There are certainly contributing factors, but one factor is unique to the contemporary era: receiving the majority of our information via social media experiences. Media algorithms, and to some extent overt censorship, serve users curated content that is unlike what their neighbors receive.Lies of Omission brings together various perspectives on the causes and effects of the divided information streams. Psychology and neuroscience, combined with some historical jurisprudence, are woven together to spell out the dangers of the modern social media experience. Importantly, the human response can be understood as rooted in our psychology and neurochemistry. In part two of the book, eight hot button issues that have provoked deep divisions among American citizens are presented as well-researched, opposing-view chapters with a goal to lay bare the extent of the disinformation gap that we are living in. With the rise of ephemeral smart media, and the associated displacement of the permanently printed word, it is rare to have a clear idea of what persons who do not share our opinions actually believe, or why.The decimation of communal information sources is nearly complete. What can one do? One concrete step is to turn some of your attention away from curated, impermanent news and read a book. Read this book. Dr. Catherine DeSoto spells out why it is worth our time to be informed regarding the issues we care about: something your phone's curated media will never do for you. Open your mind to the quaint idea that one is not informed unless one understands the opposing view. Surprising all-new research regarding the political divide and the pandemic is included. Together with over 150 references, this book will be the definitive source documenting the effects of the media algorithm revolution.

Published
2022

140. Biography and Genealogy Master Index:Cumulation of Supplements: 2011-2015

Author

Gale Research Inc and Gale Research Inc

Abstract

The Biography and Genealogy Master Index is designed to help you easily determine which publication to consult for biographical information. Indexed sources cover both living and deceased persons from every field of activity and from every country in the world. Typically current, readily available, standard reference works are indexed. Look for supplement volume updates to this valuable biographical research tool twice a year. These volumes are cumulated every five years. More than 15 million citations compiled from more than 5,000 editions and volumes of approximately 1,700 current and retrospective biographical sources are included in the Biography and Genealogy Master Index base set and its supplements. In total, Biography and Genealogy Master Index provides coverage of nearly 5 million contemporary and historical figures from authors to scientists, from boxers to fashion designers, from Adam and Eve to Frank Zappa.

Published
2017

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