Bulletin of the American Physical Society
2021 Annual Meeting of the APS Four Corners Section
Volume 66, Number 11
Friday–Saturday, October 8–9, 2021; Virtual; Mountain Daylight Time
Session B01: Astrophysics I |
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Chair: Patricia Rankin, Arizona State University |
Friday, October 8, 2021 10:30AM - 10:54AM |
B01.00001: New Frontiers in UV Space Astrophysics Invited Speaker: Erika Hamden Ultraviolet astrophysics is experiencing a boom of interest, resulting in exciting mission development in space astrophysics. This boom is driven less by recent scientific discoveries (the UV has always been scientifically rich) but rather is driven by technology advancements due to investments and work over the past 2 decades. In this talk, I will highlight how work on detector, mirror, and spacecraft technology is opening up exciting opportunities in the UV and beyond. I will describe ongoing work to observe hydrogen gas halos around galaxies with two missions: balloon-telescope FIREBall-2 and Aspera, a newly funded NASA Pioneers SmallSat. I will also describe a mission in development, Hyperion, which explores a fundamental question for all of astrophysics- how is a star formed? [Preview Abstract] |
Friday, October 8, 2021 10:54AM - 11:06AM |
B01.00002: Looking for Changes in Photospheric Temperature Gradients over Solar Cycle 24 Using Hinode/SP James Crowley The intent of this project is to study the effects of the solar magnetic cycle on the physical structure, namely the thermal structure, of the solar atmosphere in the quiet Sun. Using data from the spectropolarimeter onboard the Hinode satellite, datasets were selected from throughout Solar Cycle 24; all datasets selected were near the disk center and without any obvious magnetic signatures. Using two inversion methods, first a simple inversion based on the Milne-Eddington model, and then a more sophisticated atmospheric model using the SIR inversion code, a quarter-million pixels were inverted from each dataset. By inverting the data and analyzing the differences in the inverted parameters between the datasets, we attempt to see if the resolution and the precision of the Hinode data is able to detect meaningful differences in photospheric structure throughout the solar cycle, primarily the source function and its gradient as indicators of the temperature gradient. Inversion results using both the Milne-Eddington approach and the SIR inversion code are being analyzed for statistical differences between years [Preview Abstract] |
Friday, October 8, 2021 11:06AM - 11:18AM |
B01.00003: The 2021 Outburst of BL Lacertae Gilvan Apolonio, Michael Joner BL Lacerate is the prototype object for the BL Lac class of Active Galactic Nuclei (AGN). The most recent outburst of BL Lac occurred in the summer of 2021. The 0.9 and 0.3-meter telescopes at the Brigham Young University West Mountain Observatory were utilized to secure photometry of the event in standard Johnson/Cousins B, V, and R filters from May 2021 through September 2021. This presentation details variations spanning the event and includes several nights of time series photometry showing significant variation within periods of less than an hour. [Preview Abstract] |
Friday, October 8, 2021 11:18AM - 11:30AM |
B01.00004: Study of variability in radiation from the Blazar source 3C454.3 Kaustav Dipta Goswami, Rupjyoti Gogoi, Rukaiya Khatoon Blazars, a subclass of Active Galactic Nuclei (AGN), are the most promising sources of high energy emission in the known universe. Here, the emission originates from a relativistic jet aligned at or close to the line of sight of the observer. Extending from radio to gamma-ray energies, their broad band spectrum is predominantly non-thermal. Blazars show very high flux variability across the entire electromagnetic spectrum. In this work, we present a study of the long-term variability in radiation from the FSRQ 3C454.3 by constructing flux distributions using 10-year simultaneous optical and gamma ray observations from SPOL at Steward Observatory and Fermi-LAT, respectively. Also, we study flux distribution using X-ray data from AstroSat. We perform investigations of the temporal and spectral variability. As for the temporal analysis, we construct light-curves with the data from all the three bands. Further, we construct the Spectral Energy Distribution (SED) using X-ray data (LAXPC and SXT) and fit the SED with various models viz. power-law, log-parabola and broken power-law. [Preview Abstract] |
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