Neutral hydrogen near the north galactic pole
نویسندگان
چکیده
منابع مشابه
Neutral hydrogen in galactic fountains
Simulations of an isolated Milky Way-like galaxy, in which supernovae power a galactic fountain, reproduce the observed velocity and 21 cm brightness statistics of galactic neutral hydrogen (H i). The simulated galaxy consists of a thin H i disk, similar in extent and brightness to that observed in the Milky Way, and extra-planar neutral gas at a range of velocities due to the galactic fountain...
متن کاملUniformity of foreground Galactic neutral Hydrogen over cooling flow clusters
Radio maps at 21 cm of foreground neutral hydrogen over three cooling flow clusters of galaxies show that the foreground gas is uniform on scales from ∼ 1 – 10 arcmin. Five sigma limits on fluctuations in the foreground column density for Abell 3581, Sersic 159-03 and Abell 2597 are 6.2× 10, 7.8× 10 and 4.3× 10 cm−2, or 14, 43 and 17 percent of the mean foreground column density in the region o...
متن کاملKinematic Structure in the Galactic Halo at the North Galactic Pole: RR Lyrae and BHB Stars show different kinematics
Radial velocities and proper motions (derived from the GSC-II database) are given for 38 RR Lyrae (RRL) stars and 79 blue horizontal branch (BHB) stars in a ∼ 200 deg area around the North Galactic Pole (NGP). Both heliocentric (UVW) and galactocentric (VR, Vφ, Vz) space motions are derived for these stars using a homogeneous distance scale consistent with (m−M)0=18.52 for the LMC. An analysis ...
متن کاملThe Interpretation of Near-Infrared Star Counts at the South Galactic Pole
We present new deep K ′ counts of stars at the South Galactic Pole (SGP) taken with the NAOJ PICNIC camera to K =17.25. Star–galaxy separation to K =17.5 was accomplished effectively using image profiles because the pixel size we used is 0.509 arcsec. We interpret these counts using the SKY (Cohen 1994) model of the Galactic point source sky and determine the relative normalization of halo-to-d...
متن کاملLOFAR/H-ATLAS: A deep low-frequency survey of the Herschel-ATLAS North Galactic Pole field
We present LOFAR High-Band Array (HBA) observations of the Herschel-ATLAS North Galactic Pole survey area. The survey we have carried out, consisting of four pointings covering around 142 square degrees of sky in the frequency range 126–173 MHz, does not provide uniform noise coverage but otherwise is representative of the quality of data to be expected in the planned LOFAR wide-area surveys, a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1964
ISSN: 0004-6256
DOI: 10.1086/109270