Results 121 to 130 of about 722,598 (307)

Oxygen and Nitrogen in Isolated Dwarf Irregular Galaxies [PDF]

Astrophys.J.636:214-239,2005, 2005
We present long slit optical spectroscopy of 67 HII regions in 21 dwarf irregular galaxies to investigate the enrichment of oxygen, nitrogen, neon, sulfur, and argon in low mass galaxies. Oxygen abundances are obtained via direct detection of the temperature sensitive emission lines for 25 HII regions; for the remainder of the sample, oxygen abundances
arxiv   +1 more source

Shakhbazian compact galaxy groups. II. Photometric and spectroscopic study of ShCG 376 [PDF]

, 2003
The results of the redshift measurements and of the detailed surface photometry in BVR of the compact group ShCG 376 are presented. The radial velocity dispersion, the virial mass, the total luminosity, the M/L ratio, and the crossing time of the group ...
Alonso, Amirkhanian, Arp, Baier, Burbidge, del Olmo, di Tullio, G. H. Tovmassian, H. M. Tovmassian, H. Tiersch, Hickson, Kirshner, Kodaira, Kodaira, Kodaira, Lynds, Mirzoyan, Moles, Robinson, Schlegel, Schombert, Shakhbazian, Stoll, Sulentic, Sulentic, Tiersch, Tiersch, Tiersch, Tovmassian, Tovmassian, Tovmassian, V. H. Chavushyan, Zickgraf   +32 more
core   +2 more sources

The Interstellar Medium in Dwarf Irregular Galaxies [PDF]

Annual Review of Astronomy and Astrophysics
Dwarf irregular (dIrr) galaxies are among the most common type of galaxy in the Universe. They typically have gas-rich, low-surface-brightness, metal-poor, and relatively thick disks. Here, we summarize the current state of our knowledge of the interstellar medium (ISM), including atomic, molecular, and ionized gas, along with their dust properties and
Hunter, Deidre A., Elmegreen, Bruce G., Madden, Suzanne C.   +2 more
openaire   +3 more sources

Unusual Drainages of the Americas

Water Resources Research, Volume 61, Issue 2, February 2025.
Abstract While most rivers and lakes follow predictable principles of hydrology and geology, a few seem to defy the rules. Some rivers diverge rather than converge; some rivers flow in two directions; some lakes have not one but two outlets; some watersheds have ambiguous boundaries.
Robert B. Sowby, Adam C. Siegel
wiley   +1 more source

A Multiwavelength Portrait of the 3C 220.3 Lensed System

The Astrophysical Journal
The 3C 220.3 system is a rare case of a foreground narrow-line radio galaxy (“galaxy A,” z _A = 0.6850) lensing a background submillimeter galaxy ( z _SMG = 2.221).
Sóley Ó. Hyman, Belinda J. Wilkes, S. P. Willner, Joanna Kuraszkiewicz, Mojegan Azadi, D. M. Worrall, Adi Foord, Simona Vegetti, Matthew L. N. Ashby, Mark Birkinshaw, Christopher Fassnacht, Martin Haas, Daniel Stern   +12 more
doaj   +1 more source

Steps toward Unraveling the Structure and Formation of Five Polar Ring Galaxies

Galaxies
Polar ring galaxies (PRGs) are unusual relative to common galaxies in that they consist of a central host galaxy—usually a gas-poor, early-type S0 or elliptical galaxy—surrounded by a ring of gas, dust and stars that orbit perpendicular to the major axis
Kyle E. Lackey, Varsha P. Kulkarni, Monique C. Aller   +2 more
doaj   +1 more source

Evolutionary synthesis models for spirals and irregular galaxies [PDF]

arXiv, 2007
We show autoconsistent chemical and spectro-photometric evolution models applied to spiral and irregular galaxies. Evolutionary synthesis models usually used to explain the stellar component spectro-photometric data, are combined with chemical evolution models, to determine precisely the evolutionary history of spiral and irregular galaxies.
arxiv  

Patient‐Generated Data as Interventions in Doctor‐Patient Relationships? Negotiating (Un)Invited Participation in Medical Consultations

Sociology of Health &Illness, Volume 47, Issue 2, February 2025.
ABSTRACT Health data generated by apps and devices are increasingly popular and expected to affect various aspects of doctor‐patient relationships. No longer confined to medically authorised and certified health technologies, a range of biomedical data—from heart rate to blood pressure or oxygen saturation—are captured and processed by consumer health ...
Ann Kristin Augst, Danny Lämmerhirt, Cornelius Schubert   +2 more
wiley   +1 more source

A Wide Field Planetary Camera 2 Study of the Resolved Stellar Population of the Pegasus Dwarf Irregular Galaxy (DDO 216) [PDF]

, 1998
The stellar population of the Pegasus dwarf irregular galaxy is investigated in images taken in the F439W (B), F555W (V), and F814W (I) bands with the Wide Field Planetary Camera 2 (WFPC2) on the Hubble Space Telescope.
J. Gallagher, E. Tolstoy, R. C. Dohm-Palmer, E. Skillman, A. Cole, J. Hoessel, A. Saha, Mario Mateo   +7 more
semanticscholar   +1 more source

A Comparison between the Morphologies and Structures of Dwarf Galaxies with and without Active Massive Black Holes

The Astrophysical Journal, 2023
We study the morphologies and structures of 57 dwarf galaxies that are representative of the general population of dwarf galaxies and compare their demographics to a sample of dwarf galaxies hosting optically selected active galactic nuclei (AGNs).
Seth J. Kimbrell, Amy E. Reines, Jenny E. Greene, Marla Geha   +3 more
doaj   +1 more source