Results 21 to 30 of about 20,346,263 (306)

Surveying the Giant H ii Regions of the Milky Way with SOFIA: V. DR7 and K3-50

The Astrophysical Journal, 2023
We present our fifth set of results from our mid-infrared imaging survey of Milky Way Giant H ii (GH ii ) regions with our detailed analysis of DR7 and K3-50.
James M. De Buizer, Wanggi Lim, James T. Radomski, Mengyao Liu   +3 more
doaj   +1 more source

A Large-Scale, Low-Frequency Murchison Widefield Array Survey of Galactic H ii Regions between 260° [PDF]

, 2016
We have compiled a catalogue of H ii regions detected with the Murchison Widefield Array between 72 and 231 MHz. The multiple frequency bands provided by the Murchison Widefield Array allow us identify the characteristic spectrum generated by the thermal
Kaplan, D. L., Prabu, T, McWhirter, S. R., Cappallo, R. J., Ord, SM, Procopio, P, Hindson, L, Williams, C. L., Morales, M., Mckinley, B, Morgan, J., Greenhill, L., Hindson, L., Williams, A., Hurley-Walker, N., Staveley-Smith, L, Lonsdale, C. J., Tingay, SJ, Kaplan, D., Mitchell, DA, Williams, A, Prabu, T., Wu, C., Lonsdale, C., Callingham, JR, Su, H, For, BQ, Srivani, K. S., Johnston-Hollitt, M., Dwarakanath, K., Udaya Shankar, N, Cappallo, R., Ord, S. M., Mitchell, D., Morales, M. F., Williams, C., Callingham, J., Procopio, P., Hurley-Walker, N, Lenc, E, Lonsdale, CJ, Wu, C, Mitchell, D. A., BERNARDI, GIANNI, Subrahmanyan, R., For, B., Tingay, S. J., Webster, R., Kapińska, A. D., Wayth, RB, Greenhill, L. J., Hazelton, B. J., Briggs, F., Williams, CL, Deshpande, A., Shankar, N. Udaya, Shankar, N., Dwarakanath, K. S., Bell, M, Subrahmanyan, R, For, B. -Q, Webster, R. L., Zheng, Q., Deshpande, AA, Offringa, A, For, B.-Q, Hancock, P, For, B. -Q., Srivani, K., Webster, RL, Kaplan, DL, Deshpande, A. A., Bell, M., Oberoi, D, Morgan, E., Gaensler, B. M., Staveley-Smith, L., Mckinley, B., Dwarakanath, KS, Cappallo, RJ, Gaensler, B., Zheng, Q, Hancock, P., Morales, MF, UdayaShankar, N., Johnston-Hollitt, M, Srivani, KS, McWhirter, S., Callingham, J. R., Hurley-Walker, Natasha, Wayth, R. B., Ord, S., Hazelton, BJ, Kapinska, A., Greenhill, LJ, Lenc, E., Gaensler, BM, Briggs, F, Bowman, J. D., Offringa, A., Oberoi, D., Morgan, E, Bowman, JD, Bernardi, G., Tingay, Steven, McWhirter, SR, Hazelton, B., Kapinska, AD, Wayth, Randall, Morgan, J, Su, H., Bernardi, G, Bowman, J.   +112 more
core   +1 more source

Dust in H II Regions [PDF]

Symposium - International Astronomical Union, 1973
The observed far infrared flux of H II regions is interpreted as evidence for the presence of internal dust absorbing a fraction of Lyman continuum photons. The effect of this dust on the required number of ionizing photons and on the helium to hydrogen line intensity ratios are discussed and analytic formulae describing these effects are presented for
openaire   +1 more source

Ne II Observations of Gas Motions in Compact and Ultracompact H II Regions [PDF]

, 2008
We present high spatial and spectral resolution observations of 16 Galactic compact and ultracompact H II regions in the [Ne II] 12.8 mu m fine-structure line.
Thomas K. Greathouse, Lacy, John H., Daniel T. Jaffe, Zhu, Qing-Feng, Jaffe, Daniel T., Matthew J. Richter, Richter, Matthew J., Qing‐Feng Zhu, Greathouse, Thomas K., John H. Lacy   +9 more
core   +1 more source

Evolution of Stellar Feedback in H ii Regions

, 2021
Stellar feedback is needed to produce realistic giant molecular clouds and galaxies in simulations, but due to limited numerical resolution, feedback must be implemented using sub-grid models.
Olivier, Grace M., Rosen, Anna L., Bolatto, Alberto, Lopez, Laura A., Krumholz, Mark R., Krumholz, Mark, Nayak, Omnarayani, Bolatto, Alberto D., Reiter, Megan   +8 more
core   +1 more source

New giant H ii regions in the southern sky [PDF]

, 2005
We present results of a search for giant H II regions in southern galaxies. Using high-resolution spectra, obtained with the Magellan Inamori Kyocera Echelle (MIKE) at the Las Campanas Magellan II telescope, we were able to resolve the emission-line ...
Bosch, Guillermo Luis, G. Bosch, N. Morrell, Morrell, Nidia Irene, V. Firpo, Firpo, Verónica   +5 more
core   +2 more sources

Properties of H II region populations in galaxies. II - The H II region luminosity function

The Astrophysical Journal, 1989
H-alpha emission-line fluxes have been measured for all of the detected H II regions in 30 nearby spiral and irregular galaxies, and these data are used to study the behavior of the H II region luminosity functions (LFs). In most galaxies, the LF is well represented by a power law function.
Robert C., Jr. Kennicutt, B. Kevin Edgar, Paul W. Hodge   +2 more
openaire   +1 more source

Sagittarius B1: A Patchwork of H ii Regions and Photodissociation Regions [PDF]

The Astrophysical Journal, 2021
Abstract Sgr B1 is a luminous H ii region in the Galactic center immediately next to the massive star-forming giant molecular cloud Sgr B2 and apparently connected to it from their similar radial velocities. In 2018 we showed from SOFIA FIFI-LS observations of the [O iii] 52 and 88 μm lines that there is no central exciting star cluster ...
Janet P. Simpson, Sean W. J. Colgan, Angela S. Cotera, Michael J. Kaufman, Susan R. Stolovy   +4 more
openaire   +2 more sources

Hydrodynamical models of cometary H ii regions [PDF]

, 2017
We have modelled the evolution of cometary H ii regions produced by zero-age main-sequence stars of O and B spectral types, which are driving strong winds and are born off-centre from spherically symmetric cores with power-law (α = 2) density slopes.
Steggles, HG, Hoare, MG, M. G. Hoare, J. M. Pittard, Pittard, JM, H. G. Steggles   +5 more
core   +1 more source

Multicolour Far Infrared Photometry of Galactic H II Regions [PDF]

, 1974
Results are presented of far infrared photometric measurements of some galactic H II regions in the galactic plane between longitudes 350° and 40°
Olthof, Hindericus
core   +4 more sources