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Astrophysics > Instrumentation and Methods for Astrophysics

arXiv:2411.00057 (astro-ph)
[Submitted on 29 Oct 2024]

Title:Galactic Neutral Hydrogen Structures Spectroscopy and
Kinematics: Designing a Home Radio Telescope for 21 cm Emission

Authors:Jack Phelps
View a PDF of the paper titled Galactic Neutral Hydrogen Structures
Spectroscopy and Kinematics: Designing a Home Radio Telescope for 21
cm Emission, by Jack Phelps
View PDF

    Abstract:This study presents the methodology for creating a
    cost-efficient radio astronomy telescope that can be used to
    detect 21 cm emissions (1420.405 MHz) and determine the
    distribution and kinematics of neutral hydrogen specifically in
    the Milky Way. By measuring the Doppler shifts of the 21 cm
    emission, the velocities of hydrogen clouds relative to Earth can
    be determined. This enables the identification of these clouds'
    movements, their positions within the galaxy's spiral arms, and
    their roles in the overall rotational dynamics of the Milky Way.
    The setup is designed to be accessible to amateurs, enabling
    others to conduct similar projects. The measurement apparatus
    consists of a 1-meter parabolic dish, a H1-LNA for 21 cm
    emissions, an SDR, and a Raspberry Pi. This paper also provides
    an overview of the data processing required to detect the
    hydrogen line and generate velocity profiles. Additionally, it
    examines RFI mitigation techniques, such as spectral filtering
    and instrument shielding, which enhance observational clarity
    even in urban environments like Los Angeles. This study also
    analyzes the observed velocities of different galactic arms, as
    well as measurements across the sky.

Comments: High School Paper. 28 pages, 22 figures
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM);
          Physics Education (physics.ed-ph)
Cite as:  arXiv:2411.00057 [astro-ph.IM]
          (or arXiv:2411.00057v1 [astro-ph.IM] for this version)
          https://doi.org/10.48550/arXiv.2411.00057
          Focus to learn more
          arXiv-issued DOI via DataCite

Submission history

From: Jack Phelps [view email]
[v1] Tue, 29 Oct 2024 02:20:23 UTC (11,996 KB)
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    View a PDF of the paper titled Galactic Neutral Hydrogen
    Structures Spectroscopy and Kinematics: Designing a Home Radio
    Telescope for 21 cm Emission, by Jack Phelps
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