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Using high spatial resolution Hubble Space Telescope/Advanced Camera for Surveys archival imaging observations of Arp 116, centred on the elliptical galaxy NGC 4649, we explore the novel technique of pixel-by-pixel analysis of the galaxy's…

Astrophysics · Physics 2009-11-11 Richard de Grijs , Alasdair R. I. Robertson

We present the initial results of a Hubble Space Telescope/ACS snapshot survey of 16 nearby, edge-on, late-type galaxies covering a range in distance from 2 to 19 Mpc. The images of these galaxies show significant resolved stellar…

Astrophysics · Physics 2009-11-10 Anil C. Seth , Julianne J. Dalcanton , Roelof S. de Jong

We use Hyper Suprime-Cam on the Subaru Telescope to investigate the structural and photometric properties of early-type dwarf galaxies and young stellar systems at the center of the M81 Group. We have mapped resolved stars to $\sim2$…

Astrophysics of Galaxies · Physics 2019-11-06 Sakurako Okamoto , Nobuo Arimoto , Annette M. N. Ferguson , Mike J. Irwin , Edouard J. Bernard , Yousuke Utsumi

We have reported in a previous paper (AAS 116, 417, 1996) B, V and I band photometric data for a sample of 24 edge-on interacting spiral galaxies, together with a control sample of 7 edge-on isolated galaxies. We discuss here the main…

Astrophysics · Physics 2007-05-23 Vladimir Reshetnikov , Francoise Combes

We present the results from deep 21 cm H I mapping of two nearby blue compact dwarf galaxies (BCDGs), W1016+3754 and W2326+0608, using the Giant Metrewave Radio Telescope (GMRT). These BCDGs are bright in mid-infrared (MIR) data and…

Astrophysics of Galaxies · Physics 2023-06-07 Yogesh Chandola , Chao-Wei Tsai , Di Li , Chandreyee Sengupta , Yin-Zhe Ma , Pei Zuo

We study star formation in a sample of 345 galaxies in 167 pairs and compact groups drawn from the original CfA2 Redshift Survey and from a follow-up search for companions. We construct our sample with attention to including pairs with…

Astrophysics · Physics 2008-11-26 Deborah Freedman Woods , Margaret J. Geller , Elizabeth J. Barton

We describe the properties of a remarkable group of actively star-forming dwarf galaxies and HII galaxies in the Abell 1367 cluster, which were discovered in a large-scale H-alpha imaging survey of the cluster. Approximately 30…

Astrophysics · Physics 2009-11-07 Shoko Sakai , Robert Kennicutt , J. M. van der Hulst , Chris Moss

We have searched for companion galaxies in the close environment of 98 star-forming dwarf galaxies (SFDGs) from field and low density environments, using the NASA Extragalactic Database. Most of the companions are dwarf galaxies which due…

Astrophysics · Physics 2009-11-06 K. G. Noeske , J. Iglesias-Paramo , J. M. Vilchez , P. Papaderos , K. J. Fricke

As part of the pilot survey of the Widefield ASKAP L-band Legacy All-sky Survey (WALLABY), high-resolution neutral atomic hydrogen (HI) observations of the dwarf galaxy pair NGC 4532/DDO 137 (WALLABY J123424+062511) have revealed a huge (48…

Context: Pre-merger interactions between galaxies can induce significant changes in the morphologies and kinematics of the stellar and ISM components. Large amounts of gas and stars are often found to be disturbed or displaced as tidal…

Astrophysics of Galaxies · Physics 2015-12-16 Chandreyee Sengupta , Thomas. C. Scott , Sanjaya Paudel , D. J. Saikia , K. S. Dwarakanath , B. W. Sohn

The Sagittarius dwarf spheroidal (Sgr dSph) galaxy provides one of the most convincing examples of tidal interaction between satellite galaxies and the Milky Way (MW). The main body of the dwarf was recently demonstrated to have an…

Astrophysics of Galaxies · Physics 2024-07-03 Ewa L. Lokas

Tidal ring galaxies are observed rarely in the local universe due to their intrinsically transient nature. The tidal ring structures are the result of strong interactions between gas-rich stellar disks and smaller galactic systems and do…

The isolated elliptical (IE) NGC 7796 is accompanied by an interesting early-type dwarf galaxy, named NGC7796-DW1. It exhibits a tidal tail, very boxy isophotes, and multiple nuclei or regions (A, B, and C) that are bluer than the bulk…

Astrophysics of Galaxies · Physics 2018-12-19 T. Richtler , M. Hilker , K. Voggel , T. H. Puzia , R. Salinas , M. Gómez , R. Lane

We present integrated Washington CT1 photometry of 18 bright blue objects discovered in the dwarf galaxy UGC 7636 which is located 5'.5 southeast of the giant elliptical galaxy NGC 4472, the brightest galaxy in the Virgo cluster. Several…

Astrophysics · Physics 2009-10-30 Myung Gyoon Lee , Eunhyeuk Kim , Doug Geisler

Dual AGN are important for understanding galaxy-merger-triggered fueling of black holes and hierarchical growth of structures. The least explored type of dual AGN are those associated with mergers of two dwarf galaxies. According to…

Astrophysics of Galaxies · Physics 2023-03-01 Marko Mićić , Olivia J. Holmes , Brenna N. Wells , Jimmy A. Irwin

We present an analysis of archival Very Large Array (VLA) and Five-hundred-meter Aperture Spherical radio Telescope (FAST) \HI\ 21 cm data, together with archival multi-band radio continuum observations, of the nearby luminous infrared…

Astrophysics of Galaxies · Physics 2026-03-13 Guixiang Feng , Zhongzu Wu , Chuanpeng Zhang , Ming Zhu

The GMRT observations of the HI 21~cm-line emission from 13~nearby dwarf star-forming galaxies are presented. The ranges of star formation rates and stellar masses of the sample galaxies are 0.03 -- 1.7~$M_\odot~{\rm yr}^{-1}$ and 0.04 --…

Astrophysics of Galaxies · Physics 2020-09-09 Sumit Jaiswal , Amitesh Omar

We estimate the cosmic number density of the recently identified class of HI-bearing ultra-diffuse sources (HUDs) based on the completeness limits of the ALFALFA survey. These objects fall in the range $8.5 < \log M_{\rm{HI}}/\rm{M_{\odot}}…

A photometric and spectroscopic analysis of 152 cool white dwarf stars is presented. The discovery of 7 new DA white dwarfs, 2 new DQ white dwarfs, 1 new magnetic white dwarf, and 3 weak magnetic white dwarf candidates, is reported, as well…

Astrophysics · Physics 2009-10-31 P. Bergeron , S. K. Leggett , Maria Teresa Ruiz

We present 1,201 galaxies at $0.05<z<0.45$ that host tidal features, detected from the first $\sim\! 200$ deg$^2$ of imaging from the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP). All galaxies in the present sample have…