We study numerically the ambipolar diffusion-driven evolution of nonrotating, magnetically subcritical, disk-like molecular clouds, assuming axisymmetry. Previous similar studies have concentrated on the formation of single magnetically supercritical cores at the cloud center, which collapse to form isolated stars. We show that, for a cloud with many Jeans masses and a relatively flat mass dist...

We examine the properties of embedded clusters within 1 kiloparsec using new data from the Spitzer Space Telescope, as well as recent results from 2MASS and other ground-based near-infrared surveys. We use surveys of entire molecular clouds to understand the range and distribution of cluster membership, size and surface density. The Spitzer data demonstrate clearly that there is a continuum of ...

Magnetic fields play an important role in creating, driving, and in the evolution of outflows and jets from protostars and accretion disks. On the other hand, the temperature profile of the accretion disks may also affect the structure of the magnetic field and outflows. In this paper, we use the self-similar method in cylindrical coordinates to investigate the effect of the temperature profile...

ABSTRACT G0.253+0.016, aka ‘the Brick’, is one of the most massive (>105 M⊙) and dense (>104 cm−3) molecular clouds in Milky Way’s Central Molecular Zone. Previous observations have detected tentative signs active star formation, notably a water maser that associated with dust continuum source. We present ALMA Band 6 an angular resolution 0.13 arcsec (1000 AU) towards this ‘maser ...

We have conducted an optical long-term monitoring survey of the majority of dwarf galaxies in the Local Group, with the Isaac Newton Telescope (INT), to identify the long period variable (LPV) stars. LPV stars vary on timescales of months to years, and reach the largest amplitudes of their brightness variations at optical wavelengths, due to the changing temperature. They trace stellar populati...

It has been argued that the low-mass primordial stars ($m_{\rm Pop III}\,\leq 0.8\,M_\odot$) are likely to enter main sequence and hence possibly be found in present-day Galaxy. However, due limitations existing numerical capabilities, current three-dimensional (3D) simulations of disk fragmentation capable following only a few thousands years evolution after formation first protostar. In this ...

Context. The spectral energy distribution (SED) in the millimetre to centimetre range is an extremely useful tool for characterising dust protostellar envelopes as well free-free emission from protostar and outflow. Actually, evolutionary status of solar-type protostars often based on their SED near-infrared range. In addition, presence or absence can be considered indicator source stage (Class...

Abstract Star formation can produce bubbles and outflows, as a result of stellar feedback. Outflows inject momentum energy into the surrounding interstellar medium, so are related to overall balance molecular cloud. Molecular be resolved by higher-resolution radio telescopes quantify effect star on clouds. We report here identification new bubble with an outflow, Herbig–Haro object, HH 319, loc...