Time-variable radio recombination line emission in W49A
We present new Jansky Very Large Array (VLA) images of the central region of the W49A star-forming region at 3.6 cm and at 7 mm at resolutions of 0.″15 (1650 au) and 0.″04 (440 au), respectively. The 3.6 cm data reveal new morphological detail in the ultracompact H ii region population, as well as s...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
2020 October 29
|
| In: |
The astronomical journal
Year: 2020, Volume: 160, Issue: 5 |
| ISSN: | 1538-3881 |
| DOI: | 10.3847/1538-3881/abba27 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3847/1538-3881/abba27
|
| Author Notes: | C.G. De Pree, D.J. Wilner, L.E. Kristensen, R. Galván-Madrid, W.M. Goss, R.S. Klessen, M.-M. Mac Low, T. Peters, A. Robinson, S. Sloman, and M. Rao |
MARC
| LEADER | 00000caa a2200000 c 4500 | ||
|---|---|---|---|
| 001 | 174119640X | ||
| 003 | DE-627 | ||
| 005 | 20220819035016.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 201126s2020 xx |||||o 00| ||eng c | ||
| 024 | 7 | |a 10.3847/1538-3881/abba27 |2 doi | |
| 035 | |a (DE-627)174119640X | ||
| 035 | |a (DE-599)KXP174119640X | ||
| 035 | |a (OCoLC)1341382702 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rda | ||
| 041 | |a eng | ||
| 084 | |a 29 |2 sdnb | ||
| 100 | 1 | |a De Pree, Christopher Gordon |e VerfasserIn |0 (DE-588)1056150904 |0 (DE-627)794440746 |0 (DE-576)412741598 |4 aut | |
| 245 | 1 | 0 | |a Time-variable radio recombination line emission in W49A |c C.G. De Pree, D.J. Wilner, L.E. Kristensen, R. Galván-Madrid, W.M. Goss, R.S. Klessen, M.-M. Mac Low, T. Peters, A. Robinson, S. Sloman, and M. Rao |
| 264 | 1 | |c 2020 October 29 | |
| 300 | |a 13 | ||
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a Computermedien |b c |2 rdamedia | ||
| 338 | |a Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Gesehen am 26.11.2020 | ||
| 520 | |a We present new Jansky Very Large Array (VLA) images of the central region of the W49A star-forming region at 3.6 cm and at 7 mm at resolutions of 0.″15 (1650 au) and 0.″04 (440 au), respectively. The 3.6 cm data reveal new morphological detail in the ultracompact H ii region population, as well as several previously unknown and unresolved sources. In particular, source A shows elongated, edge-brightened bipolar lobes, indicative of a collimated outflow, and source E is resolved into three spherical components. We also present VLA observations of radio recombination lines at 3.6 cm and 7 mm, and IRAM Northern Extended Millimeter Array (NOEMA) observations at 1.2 mm. Three of the smallest ultracompact H ii regions (sources A, B2, and G2) all show broad kinematic linewidths, with ΔV FWHM ≳ 40 km s−1. A multi-line analysis indicates that broad linewidths remain after correcting for pressure broadening effects, suggesting the presence of supersonic flows. Substantial changes in linewidth over the 21 yr time baseline at both 3.6 cm and 7 mm are found for source G2. At 3.6 cm, the linewidth of G2 changed from 31.7 ± 1.8 km s−1 to 55.6 ± 2.7 km s−1, an increase of +23.9 ± 3.4 km s−1. The G2 source was previously reported to have shown a 3.6 cm continuum flux density decrease of 40% between 1994 and 2015. This source sits near the center of a very young bipolar outflow whose variability may have produced these changes. | ||
| 700 | 1 | |a Klessen, Ralf S. |d 1968- |e VerfasserIn |0 (DE-588)120533820 |0 (DE-627)392381532 |0 (DE-576)178685399 |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t The astronomical journal |d Washington, DC : AAS Publishing, American Astronomical Society, 1998 |g 160(2020,5) Artikel-Nummer 234, 13 Seiten |w (DE-627)312175647 |w (DE-600)2003104-X |w (DE-576)090883306 |x 1538-3881 |7 nnas |a Time-variable radio recombination line emission in W49A |
| 773 | 1 | 8 | |g volume:160 |g year:2020 |g number:5 |g extent:13 |a Time-variable radio recombination line emission in W49A |
| 856 | 4 | 0 | |u https://doi.org/10.3847/1538-3881/abba27 |x Verlag |x Resolving-System |z lizenzpflichtig |3 Volltext |
| 951 | |a AR | ||
| 992 | |a 20201126 | ||
| 993 | |a Article | ||
| 994 | |a 2020 | ||
| 998 | |g 120533820 |a Klessen, Ralf S. |m 120533820:Klessen, Ralf S. |d 700000 |d 714000 |d 714200 |d 700000 |d 728500 |e 700000PK120533820 |e 714000PK120533820 |e 714200PK120533820 |e 700000PK120533820 |e 728500PK120533820 |k 0/700000/ |k 1/700000/714000/ |k 2/700000/714000/714200/ |k 0/700000/ |k 1/700000/728500/ |p 6 | ||
| 999 | |a KXP-PPN174119640X |e 3813379612 | ||
| BIB | |a Y | ||
| SER | |a journal | ||
| JSO | |a {"relHost":[{"part":{"text":"160(2020,5) Artikel-Nummer 234, 13 Seiten","extent":"13","issue":"5","year":"2020","volume":"160"},"language":["eng"],"note":["Gesehen am 13.12.2023","Fortsetzung der Druck-Ausgabe"],"pubHistory":["Nachgewiesen 115.1998 - ; auch mit durchgehender Nr.-Zählung"],"disp":"Time-variable radio recombination line emission in W49AThe astronomical journal","type":{"bibl":"periodical","media":"Online-Ressource"},"titleAlt":[{"title":"AJ electronic edition"}],"recId":"312175647","id":{"zdb":["2003104-X"],"issn":["1538-3881"],"eki":["312175647"]},"title":[{"title_sort":"astronomical journal","title":"The astronomical journal"}],"origin":[{"publisherPlace":"Washington, DC ; Chicago, Ill. ; London","dateIssuedKey":"1998","dateIssuedDisp":"1998-","publisher":"AAS Publishing, American Astronomical Society ; Univ. of Chicago Press, Journals Division ; Institute of Physics Publ."}]}],"origin":[{"dateIssuedDisp":"2020 October 29","dateIssuedKey":"2020"}],"title":[{"title":"Time-variable radio recombination line emission in W49A","title_sort":"Time-variable radio recombination line emission in W49A"}],"type":{"media":"Online-Ressource","bibl":"article-journal"},"physDesc":[{"extent":"13 S."}],"id":{"eki":["174119640X"],"doi":["10.3847/1538-3881/abba27"]},"recId":"174119640X","person":[{"family":"De Pree","role":"aut","given":"Christopher Gordon","display":"De Pree, Christopher Gordon"},{"display":"Klessen, Ralf S.","given":"Ralf S.","family":"Klessen","role":"aut"}],"note":["Gesehen am 26.11.2020"],"language":["eng"],"name":{"displayForm":["C.G. De Pree, D.J. Wilner, L.E. Kristensen, R. Galván-Madrid, W.M. Goss, R.S. Klessen, M.-M. Mac Low, T. Peters, A. Robinson, S. Sloman, and M. Rao"]}} | ||
| SRT | |a DEPREECHRITIMEVARIAB2020 | ||