HI in extremely metal deficient galaxies - III. Giant Metrewave Radio Telescope observations of blue compact galaxy HS 0822+3542

Details HI in extremely metal deficient galaxies - III. Giant Metrewave Radio Telescope observations of blue compact galaxy HS 0822+3542 HI in extremely metal deficient galaxies - III. Giant Metrewave Radio Telescope observations of blue compact galaxy HS 0822+3542

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.371.1849c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 371, Issue 4, pp. 1849-1854.

Astronomy and Astrophysics

Astronomy

15

Galaxies: Individual: Hs 0822+3542: Galaxies: Individual: Sao 0822+3545: Galaxies: Interaction: Galaxies: Ism: Galaxies: Kinematics And Dynamics, Galaxies: Individual: Hs 0822+3542, Galaxies: Individual: Sao 0822+3545, Galaxies: Interaction, Galaxies: Ism, Galaxies: Kinematics And Dynamics

Scientific paper

We present the results of Giant Metrewave Radio Telescope HI 21-cm line observations of the extremely metal deficient (XMD) blue compact galaxy (BCG) HS 0822+3542. HS 0822+3542 is the smallest known XMD galaxy; from Hubble Space Telescope (HST) imaging, it has been suggested that it actually consists of two still smaller (~100 pc sized) ultra-compact dwarfs that are in the process of merging. The brighter of these two putative ultra-compact dwarfs has an ocular appearance, similar to that seen in galaxies that have suffered a penetrating encounter with a smaller companion. From our HI imaging, we find that the gas distribution and kinematics in this object are similar to that of other low-mass galaxies, albeit with some evidence for tidal disturbance. On the other hand, the HI emission has an angular size ~25 times larger than that of the putative ultra-compact dwarfs. The optical emission is also offset from the centre of the HI emission. HS 0822+3542 is located in the nearby Lynx-Cancer void, but has a nearby companion low surface brightness dwarf galaxy SAO 0822+3545. In light of all this, we also consider a scenario where the optical emission from HS 0822+3542 comes not from two merging ultra-compact dwarfs but from multiple star-forming regions in a tidally disturbed galaxy. In this model, the ocular appearance of the brighter star-forming region could be the result of triggered star formation.

Affiliated with

Also associated with

No associations

Rating

HI in extremely metal deficient galaxies - III. Giant Metrewave Radio Telescope observations of blue compact galaxy HS 0822+3542 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with HI in extremely metal deficient galaxies - III. Giant Metrewave Radio Telescope observations of blue compact galaxy HS 0822+3542, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and HI in extremely metal deficient galaxies - III. Giant Metrewave Radio Telescope observations of blue compact galaxy HS 0822+3542 will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1427596