OUTER-DISK POPULATIONS IN NGC 7793: EVIDENCE FOR STELLAR RADIAL MIGRATION
We analyzed the radial surface brightness profile of the spiral galaxy NGC 7793 using HST/ACS images from the GHOSTS survey and a new HST/WFC3 image across the disk break. We used the photometry of resolved stars to select distinct populations covering a wide range of stellar ages. We found breaks i...
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| Veröffentlicht in: | The Astrophysical journal 2012-07, Vol.753 (2), p.1-8 |
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| creator | RADBURN-SMITH, David J ROSKAR, Rok ZUCKER, Daniel B DEBATTISTA, Victor P DALCANTON, Julianne J STREICH, David DE JONG, Roelof S VLAJIC, Marija HOLWERDA, Benne W PURCELL, Chris W DOLPHIN, Andrew E |
| description | We analyzed the radial surface brightness profile of the spiral galaxy NGC 7793 using HST/ACS images from the GHOSTS survey and a new HST/WFC3 image across the disk break. We used the photometry of resolved stars to select distinct populations covering a wide range of stellar ages. We found breaks in the radial profiles of all stellar populations at 280" (~5.1 kpc). Beyond this disk break, the profiles become steeper for younger populations. This same trend is seen in numerical simulations where the outer disk is formed almost entirely by radial migration. We also found that the older stars of NGC 7793 extend significantly farther than the underlying H I disk. They are thus unlikely to have formed entirely at their current radii, unless the gas disk was substantially larger in the past. These observations thus provide evidence for substantial stellar radial migration in late-type disks. |
| doi_str_mv | 10.1088/0004-637X/753/2/138 |
| format | Article |
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| subjects | ASTRONOMY ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Breaking BRIGHTNESS COMPUTERIZED SIMULATION Disks Earth, ocean, space Exact sciences and technology GALAXIES Ghosts Migration PHOTOMETRY Populations STARS Stellar age SURFACES |
| title | OUTER-DISK POPULATIONS IN NGC 7793: EVIDENCE FOR STELLAR RADIAL MIGRATION |
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