A multiwavelength survey of HI-excess galaxies with surprisingly inefficient star formation
نویسندگان
چکیده
منابع مشابه
Star Formation in Hi Selected Galaxies I: Sample Characteristics
A sample of 69 galaxies with radial velocities less than 2500 km s was selected from the Hi Parkes All Sky Survey (HiPASS) and imaged in broad band B and R and narrow band Hα to deduce details about star formation in nearby disk galaxies while avoiding surface brightness selection effects. The sample is dominated by late-type, dwarf disks (mostly Sc and Sm galaxies) with exponential disk scale ...
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As a first step toward constraining the efficiency of the star formation episodes that lead to elliptical (E) and lenticular (S0) K+A galaxies, a survey for HI within a sample of E and S0 K+A galaxies and their likely progenitors (i.e., actively star forming E and S0 galaxies) has been conducted with the NRAO Green Bank Telescope (GBT). The sample was taken from a larger parent sample drawn fro...
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We present a series of high-resolution cosmological zoom-in simulations1 of galaxy formation to z = 0, spanning halo masses Mhalo ∼ 108 −1013 M and stellar masses M∗ ∼ 104 −1011 M . Our simulations include a fully explicit treatment of both the multi-phase ISM (molecular through hot) and stellar feedback. The stellar feedback inputs (energy, momentum, mass, and metal fluxes) are taken directly ...
متن کاملThe Effect of Local Galaxy Surface Density on Star Formation for HI selected galaxies
We present the result of investigations into two theories to explain the star formation rate-density relationship. For regions of high galaxy density, either there are fewer star forming galaxies, or galaxies capable of forming stars are present but some physical process is suppressing their star formation. We use HI Parkes All Sky Survey’s (HIPASS) HI detected galaxies and infrared and radio f...
متن کاملOn The Origin of Hi in Galaxies: Photodissociation and the “Schmidt Law” for Global Star Formation
Young stars in the disks of galaxies produce Hi from their parent H2 clouds by photodissociation. This process is widespread in latetype galaxies, and follows the distribution of Far-UV photons produced primarily by B-type stars. An estimate of the amount of dissociated gas can be made using observed Far-UV fluxes and simple approximations for the physics of photodissociation. This leads to the...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2018
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/sty214