File:Fast Radio Burst Host Galaxies (2021-010).png

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Hunting for the neighborhoods of enigmatic, fast radio bursts (FRBs), astronomers using the Hubble Space Telescope tracked four of them to the spiral arms of the four distant galaxies shown in the image.

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Description	English: Hunting for the neighborhoods of enigmatic, fast radio bursts (FRBs), astronomers using the Hubble Space Telescope tracked four of them to the spiral arms of the four distant galaxies shown in the image. The bursts are catalogued as FRB 190714, at top left; FRB 191001, at top right; FRB 180924, at bottom left; and FRB 190608, at bottom right.
Date	Taken in 2021
Source	Fast Radio Burst Host Galaxies
Author	SCIENCE: NASA, ESA, Alexandra Mannings (UC Santa Cruz), Wen-fai Fong (Northwestern) IMAGE PROCESSING: Alyssa Pagan (STScI)
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Author	Space Telescope Science Institute Office of Public Outreach
Image title	Astronomers using NASA’s Hubble Space Telescope have traced the locations of five brief, powerful radio blasts to the spiral arms of five distant galaxies.Called fast radio bursts (FRBs), these extraordinary events generate as much energy in a thousandth of a second as the Sun does in 80 years. Because these transient radio pulses disappear in much less than the blink of an eye, researchers have had a hard time tracking down where they come from, much less determining what kind of object or objects is causing them. Therefore, most of the time, astronomers don’t know exactly where to look.Locating where these blasts are coming from, and in particular, what galaxies they originate from, is important in determining what kinds of astronomical events trigger such intense flashes of energy. The new Hubble survey of eight FRBs helps researchers narrow the list of possible FRB sources.Flash in the NightThe first FRB was ever discovered in archived data recorded by the Parkes radio observatory on July 24, 2001. Since then astronomers have uncovered up to 1,000 FRBs, but they have only been able to associate roughly 15 of them to particular galaxies.“Our results are new and exciting. This is the first high-resolution view of a population of FRBs, and Hubble reveals that five of them are localized near or on a galaxy’s spiral arms,” said Alexandra Mannings of the University of California, Santa Cruz, the study’s lead author. “Most of the galaxies are massive, relatively young, and still forming stars. The imaging allows us to get a better idea of the overall host-galaxy properties, such as its mass and star-formation rate, as well as probe what’s happening right at the FRB position because Hubble has such great resolution.”In the Hubble study, astronomers not only pinned all of them to host galaxies, but they also characterized the types of locations within those galaxies. Hubble observed one of the FRB locations in 2017 and the other seven in 2019 and 2020.“We don’t know what causes FRBs, so it’s really important to use context when we have it," said team member Wen-fai Fong of Northwestern University in Evanston, Illinois. "This technique has worked very well for identifying the progenitors of other types of transients, such as supernovae and gamma-ray bursts. Hubble played a big role in those studies, too.”The galaxies in the Hubble study existed roughly 7 billion years ago and so astronomers are seeing the light from them as they were at about half of the current age of the universe.Many of them are as massive as our Milky Way. The observations were made in ultraviolet and near-infrared light with Hubble’s Wide Field Camera 3.Ultraviolet light traces the glow of young stars strung along a spiral galaxy’s winding arms. The researchers used the near-infrared images to calculate the galaxies’ mass and find where older populations of stars reside.Location, Location, LocationThe images display a diversity of spiral-arm structure, from tightly wound to more diffuse, revealing how the stars are distributed along these prominent features. A galaxy’s spiral arms trace the distribution of young, massive stars. However, the Hubble images reveal that the FRBs found near the spiral arms do not come from the very brightest regions, which blaze with the light from hefty stars. The images help support a picture that the FRBs likely do not originate from the youngest, most massive stars.These clues helped the researchers rule out some of the possible stellar objects thought to cause these brilliant flares, including the explosive deaths of the youngest, most massive stars, which generate gamma-ray bursts and some types of supernovae. Another unlikely source is the merger of neutron stars, the crushed cores of stars that end their lives in supernova explosions. These mergers take billions of years to occur and are usually found far from the spiral arms of older galaxies that are no longer forming stars.Magnetic MonstersThe team’s Hubble results, however, are consistent with the leading model that FRBs originate from young magnetar outbursts. Magnetars are a type of neutron star with powerful magnetic fields. They’re called the strongest magnets in the universe, possessing a magnetic field that is 10 trillion times more powerful than a refrigerator door magnet. Astronomers last year linked observations of an FRB spotted in our Milky Way galaxy with a region where a known magnetar resides.“Owing to their strong magnetic fields, magnetars are quite unpredictable,” Fong explained. “In this case, the FRBs are thought to come from flares from a young magnetar. Massive stars go through stellar evolution and become neutron stars, some of which can be strongly magnetized, leading to flares and magnetic processes on their surfaces, which can emit radio light. Our study fits in with that picture and rules out either very young or very old progenitors for FRBs.”The observations also helped the researchers strengthen the association of FRBs with massive, star-forming galaxies. Previous ground-based observations of some possible FRB host galaxies did not as clearly detect underlying structure, such as spiral arms, in many of them. Astronomers, therefore, could not rule out the possibility that FRBs originate from a dwarf galaxy hiding underneath a massive one. In the new Hubble study, careful image processing and analysis of the images allowed researchers to rule out underlying dwarf galaxies, according to co-author Sunil Simha of the University of California, Santa Cruz.Although the Hubble results are exciting, the researchers say they need more observations to develop a more definitive picture of these enigmatic flashes and better pinpoint their source.“This is such a new and exciting field,” Fong said. “Finding these localized events is a major piece to the puzzle, and a very unique puzzle piece compared to what’s been done before. This is a unique contribution of Hubble.”
Short title	Fast Radio Burst Hosts
Credit/Provider	NASA, ESA and A. Mannings (UC Santa Cruz)
Headline	Hubble Tracks Down Fast Radio Bursts to Galaxies’ Spiral Arm
Source	STScI
Usage terms	http://hubblesite.org/copyright/
Date and time of data generation	20 May 2021
Color space	sRGB
Exif version	2.31
Image width	800 px
Image height	800 px
Bits per component	8 8 8
Compression scheme	Uncompressed
Height	800 px
Width	800 px
Pixel composition	RGB
Number of components	3
Horizontal resolution	72 dpi
Vertical resolution	72 dpi
Contact information	outreach@stsci.edu http://hubblesite.org 3700 San Martin Drive Baltimore, MD, 21218 USA 410-338-4444
Keywords	Fast Radio Burst Hosts
Date and time of digitizing	08:39, 20 January 2021
Software used	Adobe Photoshop 22.1 (Macintosh)
Date metadata was last modified	10:29, 10 May 2021
File change date and time	10:29, 10 May 2021
Unique ID of original document	xmp.did:1cd243ea-49eb-4040-a519-78c782f0a31f

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