The density gradient inside molecular-gas clumps as a booster of their star formation activity
Star-forming regions presenting a density gradient experience a higher star formation rate than if they were of uniform density. We refer to the ratio between the star formation rate of a spherical centrally concentrated gas clump and the star formation rate that this clump would experience if it we...
Saved in:
| Main Author: | |
|---|---|
| Format: | Article (Journal) |
| Language: | English |
| Published: |
2019 December 18
|
| In: |
The astrophysical journal
Year: 2019, Volume: 887, Issue: 2, Pages: 179 |
| ISSN: | 1538-4357 |
| DOI: | 10.3847/1538-4357/ab53d6 |
| Online Access: | Verlag, Volltext: https://doi.org/10.3847/1538-4357/ab53d6
|
| Author Notes: | G. Parmentier |
MARC
| LEADER | 00000caa a2200000 c 4500 | ||
|---|---|---|---|
| 001 | 1689672501 | ||
| 003 | DE-627 | ||
| 005 | 20220817224735.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 200210s2019 xx |||||o 00| ||eng c | ||
| 024 | 7 | |a 10.3847/1538-4357/ab53d6 |2 doi | |
| 035 | |a (DE-627)1689672501 | ||
| 035 | |a (DE-599)KXP1689672501 | ||
| 035 | |a (OCoLC)1341304248 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rda | ||
| 041 | |a eng | ||
| 084 | |a 29 |2 sdnb | ||
| 100 | 1 | |a Parmentier, Geneviève |d 1973- |e VerfasserIn |0 (DE-588)173653561 |0 (DE-627)698562089 |0 (DE-576)134496051 |4 aut | |
| 245 | 1 | 4 | |a The density gradient inside molecular-gas clumps as a booster of their star formation activity |c G. Parmentier |
| 264 | 1 | |c 2019 December 18 | |
| 300 | |a 10 | ||
| 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 10.02.2020 | ||
| 520 | |a Star-forming regions presenting a density gradient experience a higher star formation rate than if they were of uniform density. We refer to the ratio between the star formation rate of a spherical centrally concentrated gas clump and the star formation rate that this clump would experience if it were of uniform density as the magnification factor ζ. We map ζ as a function of clump mass, radius, initial volume-density profile, and star formation timespan. For clumps with a steep density profile (i.e., a power-law slope ranging from −3 to −4, as observed in some high-density regions of Galactic molecular clouds), we find their star formation rate to be at least an order of magnitude higher than their top-hat equivalent. This implies that such clumps experience faster and more efficient star formation than expected based on their mean freefall time. This also implies that measurements of the star formation efficiency per freefall time of clumps based on their global properties, namely, mass, mean volume density, and star formation rate, present wide fluctuations. These reflect the diversity in the density profile of star-forming clumps, not necessarily variations in the physics of star formation. Steep density profiles inside star-cluster progenitors may be instrumental in the formation of multiple stellar populations, such as those routinely observed in old globular clusters. | ||
| 773 | 0 | 8 | |i Enthalten in |t The astrophysical journal |d London : Institute of Physics Publ., 1995 |g 887(2019,2) Artikel-Nummer 179, 10 Seiten |h Online-Ressource |w (DE-627)269019219 |w (DE-600)1473835-1 |w (DE-576)077662733 |x 1538-4357 |7 nnas |a The density gradient inside molecular-gas clumps as a booster of their star formation activity |
| 773 | 1 | 8 | |g volume:887 |g year:2019 |g number:2 |g pages:179 |g extent:10 |a The density gradient inside molecular-gas clumps as a booster of their star formation activity |
| 856 | 4 | 0 | |u https://doi.org/10.3847/1538-4357/ab53d6 |x Verlag |x Resolving-System |3 Volltext |
| 951 | |a AR | ||
| 992 | |a 20200210 | ||
| 993 | |a Article | ||
| 994 | |a 2019 | ||
| 998 | |g 173653561 |a Parmentier, Geneviève |m 173653561:Parmentier, Geneviève |d 500000 |d 500881 |e 500000PP173653561 |e 500881PP173653561 |k 0/500000/ |k 1/500000/500881/ |p 1 |x j |y j | ||
| 999 | |a KXP-PPN1689672501 |e 3591650587 | ||
| BIB | |a Y | ||
| SER | |a journal | ||
| JSO | |a {"title":[{"title_sort":"density gradient inside molecular-gas clumps as a booster of their star formation activity","title":"The density gradient inside molecular-gas clumps as a booster of their star formation activity"}],"person":[{"role":"aut","display":"Parmentier, Geneviève","roleDisplay":"VerfasserIn","given":"Geneviève","family":"Parmentier"}],"type":{"bibl":"article-journal","media":"Online-Ressource"},"note":["Gesehen am 10.02.2020"],"recId":"1689672501","language":["eng"],"origin":[{"dateIssuedDisp":"2019 December 18","dateIssuedKey":"2019"}],"id":{"doi":["10.3847/1538-4357/ab53d6"],"eki":["1689672501"]},"name":{"displayForm":["G. Parmentier"]},"physDesc":[{"extent":"10 S."}],"relHost":[{"physDesc":[{"extent":"Online-Ressource"}],"id":{"eki":["269019219"],"zdb":["1473835-1"],"issn":["1538-4357"]},"origin":[{"dateIssuedDisp":"[1995?]-","publisher":"Institute of Physics Publ. ; Univ. of Chicago Press","publisherPlace":"London ; Chicago, Ill. [u.a.]"}],"name":{"displayForm":["publ. in coll. with the American Astronomical Society. S. Chandrasekhar, managing ed"]},"titleAlt":[{"title":"The astrophysical journal / 1"},{"title":"ApJ"}],"part":{"year":"2019","issue":"2","pages":"179","volume":"887","text":"887(2019,2) Artikel-Nummer 179, 10 Seiten","extent":"10"},"pubHistory":["Vol. 447 (1995) [?]-"],"language":["eng"],"recId":"269019219","note":["Gesehen am 18.01.2022","Fortsetzung der Druck-Ausgabe"],"disp":"The density gradient inside molecular-gas clumps as a booster of their star formation activityThe astrophysical journal","type":{"bibl":"periodical","media":"Online-Ressource"},"title":[{"title_sort":"astrophysical journal","subtitle":"an international review of spectroscopy and astronomical physics","title":"The astrophysical journal"}]}]} | ||
| SRT | |a PARMENTIERDENSITYGRA2019 | ||