2018A&A...613L...9G

Query : 2018A&A...613L...9G

2018A&A...613L...9G - Astronomy and Astrophysics, volume 613L9-9 (2018/5-1)

UVIT observations of the star-forming ring in NGC 7252: Evidence of possible AGN feedback suppressing central star formation.

GEORGE K., JOSEPH P., MONDAL C., DEVARAJ A., SUBRAMANIAM A., STALIN C.S., COTE P., GHOSH S.K., HUTCHINGS J.B., MOHAN R., POSTMA J., SANKARASUBRAMANIAN K., SREEKUMAR P. and TANDON S.N.

Abstract (from CDS):

Context. Some post-merger galaxies are known to undergo a starburst phase that quickly depletes the gas reservoir and turns it into a red-sequence galaxy, though the details are still unclear. Aims. Here we explore the pattern of recent star formation in the central region of the post-merger galaxy NGC 7252 using high-resolution ultraviolet (UV) images from the UVIT on ASTROSAT. Methods. The UVIT images with 1.2 and 1.4-arcsec resolution in the FUV and NUV are used to construct a FUV-NUV colour map of the central region. Results. The FUV-NUV pixel colour map for this canonical post-merger galaxy reveals a blue circumnuclear ring of diameter ∼10'' (3.2kpc) with bluer patches located over the ring. Based on a comparison to single stellar population models, we show that the ring is comprised of stellar populations with ages ≤300Myr, with embedded star-forming clumps of younger age (≤150Myr). Conclusions. The suppressed star formation in the central region, along with the recent finding of a large amount of ionised gas, leads us to speculate that this ring may be connected to past feedback from a central super-massive black hole that has ionised the hydrogen gas in the central ∼4'' ∼1.3kpc.

Abstract Copyright: © ESO 2018

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: formation - galaxies: nuclei - galaxies: star formation - ultraviolet: galaxies

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	NGC 7252	AGN	22 20 44.7748209648	-24 40 41.909518200	12.26	12.46	12.06	11.57		~	720	1

Query : 2018A&A...613L...9G

Basic data :

NGC 7252 -- Active Galaxy Nucleus

IG (), G (2016A&A,AM,...), * (GSC,Gaia), X (2RXP,[RP98b]), IR (IRAS,PSCz), AGN (2019MNRAS), EmG (2022ApJS), GiG ([CHM2007]), AG? (2020MNRAS), MIR (WISE)

22 20 44.7748209648 -24 40 41.909518200 (Optical) [ 0.2686 0.2533 90 ] A 2020yCat.1350....0G

22 17 57.8707491919 -24 55 49.221915224 [ 0.2686 0.2533 90 ]

028.4389184049542 -56.1482484472529 [ 0.2686 0.2533 90 ]

0.136 0.489 [0.305 0.266 90] A 2020yCat.1350....0G

V(km/s) 4699 [~] / z(spectroscopic) 0.0158 [~] / cz 4737 [~] (Opt) D 2011MNRAS.414..500H

E D 1996MNRAS.278.1025L

0.880 0.757 115 (NIR) C 2006AJ....131.1163S

U 12.26 [0.13] D 2007ApJS..173..185G

B 12.46 [~] C 1989ESOLV.C......0L

V 12.06 [0.13] D 2007ApJS..173..185G

R 11.57 [~] C 1989ESOLV.C......0L

G 16.495018 [0.008571] C 2020yCat.1350....0G

J 10.262 [0.017] C 2006AJ....131.1163S

H 9.592 [0.021] C 2006AJ....131.1163S

K 9.312 [0.025] C 2006AJ....131.1163S

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`NGC 7252`	`ESO 533-15`	`NAME Atoms for Peace Galaxy`	`[CHM2007] LDC 1516 J222044.75-2440420`
`AM 2217-245`	`GSC 06962-01357`	`NAME Atoms-for-Peace Galaxy`	`[HSN2016] J335.18-24.67`
`APG 226`	`IRAS 22179-2455`	`PRC D-35`	`[M98c] 221758.0-245548`
`APMBGC 533+050-008`	`IRAS F22179-2455`	`PSCz Q22179-2455`	`[RP98b] NGC 7252 Source A`
`2dFGRS TGS063Z188`	`LEDA 68612`	`2RXP J222044.6-244041`	`Gaia DR2 6625720570070068992`
`6dFGS gJ222044.8-244042`	`2MASX J22204475-2440420`	`SGC 221758-2455.8`	`Gaia DR3 6625720570070068992`
`ESO-LV 533-0150`	`MCG-04-52-036`	`WISE J222044.76-244041.9`

References (720 between 1850 and 2026) (Total 720)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : NGC 7252

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`NGC 7252`	`APG 226`	`2dFGRS TGS063Z188`	`ESO-LV 533-0150`	`GSC 06962-01357`
`IRAS 22179-2455`	`IRAS F22179-2455`	`2MASX J22204475-2440420`	`WISE J222044.76-244041.9`	`Gaia DR2 6625720570070068992`
`Gaia DR3 6625720570070068992`

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