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Sökning: onr:"swepub:oai:DiVA.org:su-216787" > Dust-buried Compact...

LIBRIS Formathandbok  (Information om MARC21)
FältnamnIndikatorerMetadata
00003586naa a2200469 4500
001oai:DiVA.org:su-216787
003SwePub
008230503s2023 | |||||||||||000 ||eng|
0247 a https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-2167872 URI
0247 a https://doi.org/10.3847/1538-4357/acbeac2 DOI
040 a (SwePub)su
041 a engb eng
042 9 SwePub
072 7a ref2 swepub-contenttype
072 7a art2 swepub-publicationtype
1001 a Calzetti, Daniela4 aut
2451 0a Dust-buried Compact Sources in the Dwarf Galaxy NGC 4449
264 c 2023-03-21
264 1b American Astronomical Society,c 2023
338 a print2 rdacarrier
520 a Multiwavelength images from the Hubble Space Telescope covering the wavelength range 0.27–1.6 μm show that the central area of the nearby dwarf galaxy NGC 4449 contains several tens of compact sources that are emitting in the hydrogen recombination line Paβ (1.2818 μm) but are only marginally detected in Hα (0.6563 μm) and undetected at wavelengths λ ≤ 0.55 μm. An analysis of the spectral energy distributions (SEDs) of these sources indicates that they are likely relatively young stellar clusters heavily attenuated by dust. The selection function used to identify the sources prevents meaningful statistical analyses of their age, mass, and dust extinction distributions. However, these cluster candidates have ages ∼5–6 Myr and AV > 6 mag, according to their SED fits, and are extremely compact, with typical deconvolved radii of 1 pc. The dusty clusters are located at the periphery of the dark clouds within the galaxy and appear to be partially embedded. Density and pressure considerations indicate that the H ii regions surrounding these clusters may be stalled, and that pre-supernova (pre-SN) feedback has not been able to clear the clusters of their natal cocoons. These findings are in potential tension with existing models that regulate star formation with pre-SN feedback, since pre-SN feedback acts on short timescales, ≲4 Myr, for a standard stellar initial mass function. The existence of a population of dusty stellar clusters with ages >4 Myr, if confirmed by future observations, paints a more complex picture for the role of stellar feedback in controlling star formation.
650 7a NATURVETENSKAPx Fysikx Astronomi, astrofysik och kosmologi0 (SwePub)103052 hsv//swe
650 7a NATURAL SCIENCESx Physical Sciencesx Astronomy, Astrophysics and Cosmology0 (SwePub)103052 hsv//eng
653 a Young star clusters
653 a Star clusters
7001 a Linden, Sean T.4 aut
7001 a McQuaid, Timothy4 aut
7001 a Messa, Matteo,d 1988-u Stockholms universitet,Institutionen för astronomi,Université de Genève, Switzerland4 aut0 (Swepub:su)mame4466
7001 a Ji, Zhiyuan4 aut
7001 a Krumholz, Mark R.4 aut
7001 a Adamo, Angela,d 1981-u Stockholms universitet,Institutionen för astronomi4 aut0 (Swepub:su)anad2127
7001 a Elmegreen, Bruce4 aut
7001 a Grasha, Kathryn4 aut
7001 a Johnson, Kelsey E.4 aut
7001 a Sabbi, Elena4 aut
7001 a Smith, Linda J.4 aut
7001 a Bajaj, Varun4 aut
7102 a Stockholms universitetb Institutionen för astronomi4 org
7730 t Astrophysical Journald : American Astronomical Societyg 946:1q 946:1x 0004-637Xx 1538-4357
8564 u https://doi.org/10.3847/1538-4357/acbeacy Fulltext
8564 8u https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-216787
8564 8u https://doi.org/10.3847/1538-4357/acbeac

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