搜索结果: 1-15 共查到“天文学 spiral”相关记录44条 . 查询时间(0.093 秒)
A study of spiral galaxies seen edge-on has revealed that "halos" of cosmic rays and magnetic fields above and below the galaxies' disks are much more common than previously thought.An international t...
ALMA Weighs Supermassive Black Hole at Center of Distant Spiral Galaxy（图）
ALMA Weighs Supermassive Black Hole Distant Spiral Galaxy
2015/7/13
Supermassive black holes lurk at the center of every large galaxy. These cosmic behemoths can be millions to billions of times more massive than the Sun. Determining just how massive, however, has bee...
CWRU astronomers find new details in first known spiral galaxy
CWRU astronomers first known spiral galaxy
2015/3/4
Case Western Reserve University astronomers peered deep into space to discover new features of a galaxy that’s been sketched and photographed for 170 years.
The researchers were able to see faint plu...
We have used the Far Ultraviolet Spectroscopic Explorer to search for O VI λλ1031.926, 1037.617 emission in the halos of the edge-on spiral galaxies NGC 4631 and NGC 891. In NGC 4631, we detected O VI...
Gaps in the cloud cover? Comparing extinction measures in spiral disks
dust in galaxies spiral galaxies
2014/12/23
Dust in galaxies can be mapped either by the FIR/submillimeter emission, the optical or infrared reddening of starlight, or the extinction of a known background source. We compare two dust extinction ...
The quantity of dust in a spiral disk can be estimated using the dust's typical emission or the extinction of a known source. In this paper we compare two techniques, one based on emission and one on ...
Pre-peak Ram Pressure Stripping in the Virgo Cluster Spiral Galaxy NGC 4501
NGC 4501 interactions
2014/12/23
VIVA Hi observations of the Virgo spiral galaxy NGC 4501 are presented. The Hi disk is sharply truncated to the southwest, well within the stellar disk. A region of low surface-density gas, which is m...
Chandra observation of the edge-on spiral NGC 5775: probing the hot galactic disc/halo connection
individual (NGC 5775) general
2014/12/23
We study the edge-on galaxy NGC 5775, utilizing a 58.2 ks Chandra ACIS-S observation together with complementary Hubble Space Telescope (HST) ACS, Spitzer IRAC and other multi-wavelength data sets. Th...
We examine the outer Galactic HI disk for deviations from the b = 0◦ plane by
constructing maps of disk surface density, mean height, and thickness. We find
that the Galactic warp is wel...
The relations among 8, 24 and 160 mu m dust emission within nearby spiral galaxies
ISM galaxies
2014/12/23
We investigate the relations among the stellar continuum-subtracted 8 レm polycyclic aromatic hydrocarbon (PAH 8 レ m) emission, 24 レm hot dust emission and 160 レm cold dust emission in 15 nearby face-o...
Herschel observations of ortho- and para-oxidaniumyl (H2O+) in spiral arm clouds toward Sagittarius B2(M) *,**
H2O+ massive star forming
2014/12/22
H2O+ has been observed in its ortho- and para- states toward the massive star forming core Sgr B2(M), located close to the Galactic center. The observations show absorption in all spiral arm clouds be...
The opacity of a spiral disk due to dust absorption influences every measurement we make of it in the UV and optical. Two separate techniques directly measure the total absorption by dust in the disk:...
Enhanced dust heating in the bulges of early-type spiral galaxies
nearby galaxies galaxies
2014/12/20
Stellar density and bar strength should affect the temperatures of the cool (T ~ 20–30 K) dust component in the inner regions of galaxies, which implies that the ratio of temperatures in the circumnuc...
Measurement of Galactic Logarithmic Spiral Arm Pitch Angle Using Two-Dimensional Fast Fourier Transform Decomposition
Galactic Logarithmic Spiral Arm Pitch Angle Two-Dimensional Fast Fourier Transform Decomposition
2012/2/23
A logarithmic spiral is a prominent feature appearing in a majority of observed galaxies. This feature has long been associated with the traditional Hubble classification scheme, but historical quotes...
Hubble Space Telescope Pixel Analysis of the Interacting Face-on Spiral Galaxy NGC 5194 (M51A)
Hubble Space Telescope Pixel Analysis Interacting Face-on Spiral Galaxy NGC 5194 (M51A)
2011/10/19
A pixel analysis is carried out on the interacting face-on spiral galaxy NGC 5194 (M51A), using the HST/ACS images in the F435W, F555W and F814W (BVI) bands. After 4x4 binning of the HST/ACS images to...