FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1465305881> ?p ?o ?g. }

• W1465305881 abstract "Anomalous microwave emission (AME) is believed to be due to electric dipole radiation from small spinning dust grains. The aim of this paper is a statistical study of the basic properties of AME regions and the environment in which they emit. We used WMAP and Planck maps, combined with ancillary radio and IR data, to construct a sample of 98 candidate AME sources, assembling SEDs for each source using aperture photometry on 1?-smoothed maps from 0.408GHz up to 3000GHz. Each spectrum is fitted with a simple model of free-free, synchrotron (where necessary), cosmic microwave background (CMB), thermal dust, and spinning dust components. We find that 42 of the 98 sources have significant (>5sigma) excess emission at frequencies between 20 and 60GHz. An analysis of the potential contribution of optically thick free-free emission from ultra-compact HII regions, using IR colour criteria, reduces the significant AME sample to 27 regions. The spectrum of the AME is consistent with model spectra of spinning dust. Peak frequencies are in the range 20-35GHz except for the California nebula (NGC1499), which appears to have a high spinning dust peak frequency of (50+/-17)GHz. The AME regions tend to be more spatially extended than regions with little or no AME. The AME intensity is strongly correlated with the sub-millimetre/IR flux densities and comparable to previous AME detections in the literature. AME emissivity, defined as the ratio of AME to dust optical depth, varies by an order of magnitude for the AME regions. The AME regions tend to be associated with cooler dust in the range 14-20K and an average emissivity index, beta d , of +1.8, while the non-AME regions are typically warmer, at 20-27K. In agreement with previous studies, the AME emissivity appears to decrease with increasing column density. This supports the idea of AME originating from small grains that are known to be depleted in dense regions, probably due to coagulation onto larger grains. We also find a correlation between the AME emissivity (and to a lesser degree the spinning dust peak frequency) and the intensity of the interstellar radiation field, G 0 . Modelling of this trend suggests that both radiative and collisional excitation are important for the spinning dust emission. The most significant AME regions tend to have relatively less ionized gas (free-free emission), although this could be a selection effect. The infrared excess, a measure of the heating of dust associated with HII regions, is typically >4 for AME sources, indicating that the dust is not primarily heated by hot OB stars. The AME regions are associated with known dark nebulae and have higher 12mum/25mum ratios. The emerging picture is that the bulk of the AME is coming from the polycyclic aromatic hydrocarbons and small dust grains from the colder neutral interstellar medium phase. (1 data file)." @default.
• W1465305881 created "2016-06-24" @default.
• W1465305881 creator A5001531996 @default.
• W1465305881 creator A5001543015 @default.
• W1465305881 creator A5001875063 @default.
• W1465305881 creator A5003527477 @default.
• W1465305881 creator A5003813755 @default.
• W1465305881 creator A5004231559 @default.
• W1465305881 creator A5004335124 @default.
• W1465305881 creator A5006324547 @default.
• W1465305881 creator A5006341437 @default.
• W1465305881 creator A5006393003 @default.
• W1465305881 creator A5007825523 @default.
• W1465305881 creator A5008169093 @default.
• W1465305881 creator A5009561067 @default.
• W1465305881 creator A5010910020 @default.
• W1465305881 creator A5012079280 @default.
• W1465305881 creator A5013406245 @default.
• W1465305881 creator A5013439562 @default.
• W1465305881 creator A5013812064 @default.
• W1465305881 creator A5014400660 @default.
• W1465305881 creator A5014626397 @default.
• W1465305881 creator A5015586085 @default.
• W1465305881 creator A5015901761 @default.
• W1465305881 creator A5016049245 @default.
• W1465305881 creator A5016194181 @default.
• W1465305881 creator A5016271660 @default.
• W1465305881 creator A5016282067 @default.
• W1465305881 creator A5016391066 @default.
• W1465305881 creator A5016412928 @default.
• W1465305881 creator A5016614397 @default.
• W1465305881 creator A5016781401 @default.
• W1465305881 creator A5017402210 @default.
• W1465305881 creator A5017974916 @default.
• W1465305881 creator A5018475357 @default.
• W1465305881 creator A5018732421 @default.
• W1465305881 creator A5018937038 @default.
• W1465305881 creator A5019349731 @default.
• W1465305881 creator A5019966786 @default.
• W1465305881 creator A5020053519 @default.
• W1465305881 creator A5020141845 @default.
• W1465305881 creator A5020834441 @default.
• W1465305881 creator A5021084967 @default.
• W1465305881 creator A5021394704 @default.
• W1465305881 creator A5022073979 @default.
• W1465305881 creator A5022354673 @default.
• W1465305881 creator A5023082719 @default.
• W1465305881 creator A5023857438 @default.
• W1465305881 creator A5024095636 @default.
• W1465305881 creator A5025607877 @default.
• W1465305881 creator A5025789635 @default.
• W1465305881 creator A5025841494 @default.
• W1465305881 creator A5026032813 @default.
• W1465305881 creator A5026751019 @default.
• W1465305881 creator A5027062218 @default.
• W1465305881 creator A5027088674 @default.
• W1465305881 creator A5028048531 @default.
• W1465305881 creator A5028665438 @default.
• W1465305881 creator A5028840631 @default.
• W1465305881 creator A5029917211 @default.
• W1465305881 creator A5031970167 @default.
• W1465305881 creator A5032242568 @default.
• W1465305881 creator A5032301983 @default.
• W1465305881 creator A5033013341 @default.
• W1465305881 creator A5033139785 @default.
• W1465305881 creator A5034081299 @default.
• W1465305881 creator A5034218569 @default.
• W1465305881 creator A5034536263 @default.
• W1465305881 creator A5034874386 @default.
• W1465305881 creator A5035033551 @default.
• W1465305881 creator A5035266995 @default.
• W1465305881 creator A5035942558 @default.
• W1465305881 creator A5036496814 @default.
• W1465305881 creator A5036727634 @default.
• W1465305881 creator A5037021885 @default.
• W1465305881 creator A5037246569 @default.
• W1465305881 creator A5037521756 @default.
• W1465305881 creator A5037667446 @default.
• W1465305881 creator A5038193434 @default.
• W1465305881 creator A5038294318 @default.
• W1465305881 creator A5039118371 @default.
• W1465305881 creator A5039994226 @default.
• W1465305881 creator A5040011621 @default.
• W1465305881 creator A5041703458 @default.
• W1465305881 creator A5041918271 @default.
• W1465305881 creator A5042132634 @default.
• W1465305881 creator A5042780546 @default.
• W1465305881 creator A5042807253 @default.
• W1465305881 creator A5044139428 @default.
• W1465305881 creator A5044641383 @default.
• W1465305881 creator A5046094080 @default.
• W1465305881 creator A5048518855 @default.
• W1465305881 creator A5049175464 @default.
• W1465305881 creator A5049536001 @default.
• W1465305881 creator A5049541871 @default.
• W1465305881 creator A5050165398 @default.
• W1465305881 creator A5050309898 @default.
• W1465305881 creator A5050562611 @default.
• W1465305881 creator A5050667784 @default.
• W1465305881 creator A5050925433 @default.

• next