The Giant Low Surface Brightness Galaxy Malin 1: New Constraints for Its Molecular Gas Mass from GBT/ARGUS Observations

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dc.article.numberL37
dc.catalogadorjca
dc.contributor.authorGalaz Lladser, Gaspar
dc.contributor.authorFrayer, David T.
dc.contributor.authorBlaña, Matías
dc.contributor.authorHowk, J. Christopher
dc.contributor.authorPuzia, Thomas
dc.contributor.authorJohnston, Evelyn J.
dc.contributor.authorOrdenes Briceño, Yasna
dc.contributor.authorChurch, Sarah
dc.contributor.authorGil, Santiago
dc.contributor.authorJoachimi, Katerine
dc.contributor.authorMora, Marcelo
dc.date.accessioned2024-05-10T17:58:29Z
dc.date.available2024-05-10T17:58:29Z
dc.date.issued2022
dc.description.abstractWe report on results from GBT/ARGUS 12CO(1-0) observations for the giant low surface brightness galaxy Malin 1, which allow us to determine an upper limit for its CO mass, and hence its molecular gas mass and molecular gas mass surface density ? H 2 . Although we performed very deep observations through 17 hr on-source integration time, reaching a noise level of ?0.2 mK (T A * ) with a corresponding extended source CO limit (3?) of 0.09 K km s?1, 19 times more sensitive than previous works, we do not detect the 12CO(1-0) emission line. However, the observations allow us to estimate an upper limit (3?) for the CO mass of about 7.4 × 109 M ? for the extended emission, and 1.4 × 108 M ? for the central part of the galaxy. With these figures we conclude that the molecular gas surface density is lower than 0.3 M ? pc?2, and the corresponding molecular to atomic gas mass ratio is lower than 0.13. The evidence suggests quite different physical conditions for the interstellar medium in Malin 1 compared to that of normal, high surface brightness spirals. This, in one way to another, keeps an usual molecular gas tracer as CO hidden from our observations, in spite of the diverse stellar and structural properties of Malin 1 observed by several authors since more than 30 yr.
dc.description.funderNational Science Foundation
dc.description.funderFONDECYT
dc.description.funderANID
dc.fechaingreso.objetodigital2024-05-10
dc.identifier.doi10.3847/2041-8213/aca146
dc.identifier.eissn20418213
dc.identifier.issn2041-8205
dc.identifier.scopusidSCOPUS_ID:85143588509
dc.identifier.urihttps://doi.org/10.3847/2041-8213/aca146
dc.identifier.urihttp://iopscience.iop.org/journal/2041-8205
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/85546
dc.information.autorucInstituto de Astrofísica; Galaz Lladser, Gaspar; 0000-0002-8835-0739; 1000955
dc.issue.numero2
dc.language.isoen
dc.nota.accesocontenido completo
dc.revistaAstrophysical Journal Letters
dc.subject.ddc520
dc.subject.deweyAstronomíaes_ES
dc.titleThe Giant Low Surface Brightness Galaxy Malin 1: New Constraints for Its Molecular Gas Mass from GBT/ARGUS Observations
dc.typeartículo
dc.volumen940
sipa.codpersvinculados1000955
sipa.trazabilidadSCOPUS;02-03-2023
sipa.trazabilidadORCID;2024-05-06
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