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2006•Romanian Astronomical JournalOpen access

GALAXY PAIRS AND STAR FORMATION ACTIVITY IN HICKSON COMPACT GROUPS

I. M. Selim, Gamal B. Ali, Hamed Ismail, A. Essam, A. A. Haroon

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Abstract

The effect of galaxy interaction on star formation in denseenvironment through the far-infrared emission (FIR) of galaxies has beeninvestigated using data of Hickson Compact Groups (HCGs). We have identified 470galaxy pairs with proximity criterion cr 6 390, and 358 galaxy pairs with (rp) lessthan 100 Kpc and V 6 350 km/s. We identified 41 close galaxy pairs with projectedseparations (rp) less than 25Kpc and difference in velocity V 6 100 km/s. The starformation rate (SFR) of galaxies in galaxy pairs is found to be enhanced for closegalaxy pairs. The large fraction of star formation activity is probably due to theactivity in the exchange of matter between the companions. The catalogue of galaxypairs in HCGs has been established.

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What this paper is about

The effect of galaxy interaction on star formation in denseenvironment through the far-infrared emission (FIR) of galaxies has beeninvestigated using data of Hickson Compact Groups (HCGs). We have identified 470galaxy pairs with proximity criterion cr 6 390, and 358 galaxy pairs with (rp) lessthan 100 Kpc and V 6 350 km/s. We identified 41 close galaxy pairs with projectedseparations (rp) less than 25Kpc and difference in velocity V 6 100 km/s. The starformation rate (SFR) of galaxies in galaxy pairs is found to be enhanced for closegalaxy pairs. The large fraction of star formation activity is probably due to theactivity in the exchange of matter between the companions. The catalogue of galaxypairs in HCGs has been established.

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Available abstract

The effect of galaxy interaction on star formation in denseenvironment through the far-infrared emission (FIR) of galaxies has beeninvestigated using data of Hickson Compact Groups (HCGs). We have identified 470galaxy pairs with proximity criterion cr 6 390, and 358 galaxy pairs with (rp) lessthan 100 Kpc and V 6 350 km/s. We identified 41 close galaxy pairs with projectedseparations (rp) less than 25Kpc and difference in velocity V 6 100 km/s. The starformation rate (SFR) of galaxies in galaxy pairs is found to be enhanced for closegalaxy pairs. The large fraction of star formation activity is probably due to theactivity in the exchange of matter between the companions. The catalogue of galaxypairs in HCGs has been established.

Key concepts: Astrophysics, Physics, Interacting galaxy, Lenticular galaxy, Galaxy merger, Galaxy group, Peculiar galaxy, Astronomy

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