Retrieving "Parsec" from the archives
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Distance Traveled
Linked via "Parsecs (pc)"
Nautical Miles (NM): Used primarily in aviation and maritime navigation, defined historically as one minute of arc along a great circle of the Earth's equator.
Astronomical Units (AU): Used within solar system studies, equivalent to the mean distance between the Earth and the Sun (star)/).
Parsecs (pc): Used for interstellar and… -
Galactic Center
Linked via "Parsec"
The Galactic Center refers to the central region of the Milky Way galaxy, a highly dense and dynamically complex environment dominated by a supermassive black hole (SMBH) known as Sagittarius A ($\text{Sgr A}^$). This region lies approximately $8.178 \pm 0.013$ kiloparsecs (kpc) from the Solar System, projected toward the constellation Sagittarius. Due to the extreme obscuration caused by interven…
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Galactic Center
Linked via "Central Parsec"
The Central Parsec and $\text{Sgr A}^*$
The very nucleus, the Central Parsec, is dominated by $\text{Sgr A}^$, which has an estimated mass of approximately $4.3 \times 10^6$ solar masses ($M_{\odot}$) [3]. $\text{Sgr A}^$ exhibits low levels of accretion activity, often manifesting as sporadic, brief X-ray flaring events rather than sustained, Eddington-limited luminosity typical of active galactic nuclei. This observed quiescence is hypoth… -
Type Ia Supernova
Linked via "parsecs"
$$\mu = m - M{\text{intrinsic}} = 5 \log{10}(d) - 5 + A$$
where $d$ is the distance in parsecs, $M_{\text{intrinsic}}$ is the calibrated absolute magnitude, and $A$ accounts for intervening extinction.
This standardization allows for the direct measurement of the luminosity distance $dL$ to distant galaxies. By comparing $dL$ with the redshift ($z$), cosmologists can probe the [expansion history of the universe](/entries/expansion-history-of-the-univer…