منابع مشابه
NGC 1333: A Nearby Burst of Star Formation
NGC 1333 is the currently most active region of star formation in the Perseus molecular cloud. The presence of emission-line stars and Herbig-Haro objects first established NGC 1333 as an active region of star formation. Today, NGC 1333 is one of the best studied extremely young clusters of low to intermediate mass stars. This region is rich in sub-mm cores, embedded YSOs, radio continuum sourc...
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We calculate the time evolution of the flux, apparent size, and image centroid motion of gamma-ray burst (GRB) radio jets and show that they can be resolved by the Very Long Baseline Array (VLBA) at distances of hundreds of megaparsecs. We find that GRB 030329, which showed spectroscopic evidence for an associated Type Ic supernova (SN) at a distance of ≈800 Mpc, might just be resolvable by VLB...
متن کاملIdentifying Gamma-Ray Burst Remnants in Nearby Galaxies
We study the spectral signatures arising from cooling and recombination of an interstellar medium whose equilibrium state has been altered over ∼ 100 pc by the radiation of a Gamma-Ray Burst (GRB) and its afterglow. We identify signatures in the line diagnostics which are indicative of a photo-ionized GRB remnant which is ∼< 5 × 10 4 years old . We estimate that at least a few such remnants sho...
متن کاملNuclear Activity in Nearby Galaxies
A significant fraction of nearby galaxies show evidence of weak nuclear activity unrelated to normal stellar processes. Recent high-resolution, multiwavelength observations indicate that the bulk of this activity derives from black hole accretion with a wide range of accretion rates. The low accretion rates that typify most low-luminosity active galactic nuclei induce significant modifications ...
متن کاملA census of X-ray nuclear activity in nearby galaxies
We have studied the X-ray nuclear activity of 187 nearby (distance < 15 Mpc) galaxies observed with Chandra/ACIS. We found that 86 of them have a point-like X-ray core, consistent with an accreting BH. We argue that the majority of them are nuclear BHs, rather than X-ray binaries. The fraction of galaxies with an X-ray detected nuclear BH is higher (≈ 60 per cent) for ellipticals and early-type...
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ژورنال
عنوان ژورنال: Nature Astronomy
سال: 2021
ISSN: ['2397-3366']
DOI: https://doi.org/10.1038/s41550-021-01359-3