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ESO 148-2

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ESO 148-2
Hubble image of ESO 148-2.
Observation data (J2000 epoch)
ConstellationTucana
Right ascension23h 15m 46.76s
Declination−59° 03′ 15.69″
Redshift0.044601
Heliocentric radial velocity13,371 km/s
Distance642 Mly (196.83 Mpc)
Apparent magnitude (V)14.73
Apparent magnitude (B)14.94
Characteristics
TypeMerger;HII; Sy2 Sbrst
Apparent size (V)0.9' x 0.7'
Notable featuresLuminous infrared galaxy
Other designations
ESO 148-IG002, PGC 70861, AM 2312-591, IRAS 23128-5919, IRAS F23128-5919

ESO 148-2 known as ESO 148-IG002 and IRAS 23128-5919, is a galaxy merger located in the constellation of Tucana. It is located 642 million light years from Earth and is classified a Wolf-Rayet galaxy as well as an ultraluminous infrared galaxy.[1]

Characteristics

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A late-stage merger involving two colliding disk galaxies, ESO 148-2 has a distorted main body structure that is similar to the Antennae galaxies.[2][3] Its appearance takes a form of an owl taking flight with curved large tidal tails representing as wings, made from both stars and gas.[4] The black hole in ESO 148-2 has an estimated mass of 4.4 x 107 Mʘ.[5]

ESO 148-2 is also a bright galaxy with a star formation rate of 149 Mʘ yr-1 and an infrared luminosity of LFIR =1011.71 Lʘ.[6] This infrared luminosity is interpreted as radiation emitting from dust emissions via intense heating of its star formation regions.[7][8] In the regions of the galaxy, there are type N Wolf-Rayet stars emitting N III λ4641 and He II λ4686 emission, making them the brightest subtype.[7] The H II regions of ESO 148-2 are dominated by star formation with an estimated metallicity rate of 9.09 ± 0.03.[2] Furthermore it has a point-like source, with both of the thermal and de-absorbed power law components in its spectrum having a luminosity of ~ 1.5 x 1041 and ~ 2.7 x 1042 erg s-1 respectively.[9]

ESO 148-2 has two nuclei with a projected separation of ~ 4.5 arcsec.[2] The nuclei in ESO 148-2 are found close to each other. Each of them have different properties. The northern nucleus contains a velocity dispersion value agreeing with star formation and emission line ratios in alignment of both LINERS and H II regions.[10][3] The southern nucleus on the other hand, is three times more luminous at 24 μm and harbors an active galactic nucleus detected by both infrared and X-rays[10] with an absorption-corrected luminosity of logL2-10 = 42.38+0.24-0.28.[11] In the supermassive black hole of the southern nucleus, new stars are born through powerful galactic outflows.[12]

According to Johnson UBVJHKL and spectroscopy photometry, as well as CCD-imaging, the central region of ESO 148-2 exhibits firm emission lines with a full width at half maximum of 600 kilometers per seconds (km/s). These emission lines are found blueshifted by 320 km/s to the absorption spectrum.[13]

References

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  1. ^ "Your NED Search Results". ned.ipac.caltech.edu. Retrieved 2024-10-03.
  2. ^ a b c Leslie, Sarah K.; Rich, Jeffrey A.; Kewley, Lisa J.; Dopita, Michael A. (2014-09-03). "The energy source and dynamics of infrared luminous galaxy ESO 148-IG002". Monthly Notices of the Royal Astronomical Society. 444 (2): 1842–1853. arXiv:1408.0789. doi:10.1093/mnras/stu1547. ISSN 0035-8711.
  3. ^ a b Lipari, S.; Terlevich, R.; Diaz, R. J.; Taniguchi, Y.; Zheng, W.; Tsvetanov, Z.; Carranza, G.; Dottori, H. (2003-03-21). "Extreme galactic wind and Wolf--Rayet features in infrared mergers and infrared quasi-stellar objects". Monthly Notices of the Royal Astronomical Society. 340 (1): 289–303. doi:10.1046/j.1365-8711.2003.06309.x. hdl:10183/89980. ISSN 0035-8711.
  4. ^ information@eso.org. "ESO 148-2". www.esahubble.org. Retrieved 2024-10-03.
  5. ^ Farrah, Duncan; Efstathiou, Andreas; Afonso, Jose; Bernard-Salas, Jeronimo; Cairns, Joe; Clements, David L; Croker, Kevin; Hatziminaoglou, Evanthia; Joyce, Maya; Lacy, Mark; Lebouteiller, Vianney; Lieblich, Alix; Lonsdale, Carol; Oliver, Seb; Pearson, Chris (2022-04-15). "Stellar and black hole assembly inz< 0.3 infrared-luminous mergers: intermittent starbursts versus super-Eddington accretion". Monthly Notices of the Royal Astronomical Society. 513 (4): 4770–4786. arXiv:2205.00037. doi:10.1093/mnras/stac980. ISSN 0035-8711.
  6. ^ Smith, Beverly J.; Campbell, Kristen; Struck, Curtis; Soria, Roberto; Swartz, Douglas; Magno, Macon; Dunn, Brianne; Giroux, Mark L. (2018-01-23). "Diffuse X-Ray-emitting Gas in Major Mergers". The Astronomical Journal. 155 (2): 81. doi:10.3847/1538-3881/aaa1a6. hdl:20.500.11937/66900. ISSN 0004-6256.
  7. ^ a b Johansson, L.; Bergvall, N (March 1988). "The active centre of the galaxy merger ESO 148-IG 02. II". articles.adsabs.harvard.edu. Astronomy & Astrophysics. 192: 81–86. Bibcode:1988A&A...192...81J. Retrieved 2024-10-03.
  8. ^ Charmandaris, V.; Laurent, O.; Le Floc'h, E.; Mirabel, I. F.; Sauvage, M.; Madden, S. C.; Gallais, P.; Vigroux, L.; Cesarsky, C. J. (August 2002). "Mid-infrared observations of the ultraluminous galaxies IRAS 14348-1447, IRAS 19254-7245, and IRAS 23128-5919". Astronomy & Astrophysics. 391 (2): 429–440. doi:10.1051/0004-6361:20020879. ISSN 0004-6361.
  9. ^ Franceschini, A.; Braito, V.; Persic, M.; Della Ceca, R.; Bassani, L.; Cappi, M.; Malaguti, P.; Palumbo, G. G. C.; Risaliti, G.; Salvati, M.; Severgnini, P. (2003-08-21). "An XMM-Newton hard X-ray survey of ultraluminous infrared galaxies". Monthly Notices of the Royal Astronomical Society. 343 (4): 1181–1194. arXiv:astro-ph/0304529. doi:10.1046/j.1365-8711.2003.06744.x. ISSN 0035-8711.
  10. ^ a b Rich, J. A.; Kewley, L. J.; Dopita, M. A. (2015-12-07). "Galaxy Mergers Drive Shocks: An Integral Field Study of Goals Galaxies". The Astrophysical Journal Supplement Series. 221 (2): 28. arXiv:1509.08468. doi:10.1088/0067-0049/221/2/28. ISSN 1538-4365.
  11. ^ Yamada, Satoshi; Ueda, Yoshihiro; Tanimoto, Atsushi; Imanishi, Masatoshi; Toba, Yoshiki; Ricci, Claudio; Privon, George C. (2021-12-01). "Comprehensive Broadband X-Ray and Multiwavelength Study of Active Galactic Nuclei in 57 Local Luminous and Ultraluminous Infrared Galaxies Observed with NuSTAR and/or Swift/BAT". The Astrophysical Journal Supplement Series. 257 (2): 61. arXiv:2107.10855. doi:10.3847/1538-4365/ac17f5. ISSN 0067-0049.
  12. ^ ESO. "Stars born in winds from supermassive black holes". phys.org. Retrieved 2024-10-03.
  13. ^ Bergvall, N.; Johansson, L. (1985-08-01). "The active centre of the galaxy merger ESO 148-IG02". Astronomy and Astrophysics. 149: 475–481. Bibcode:1985A&A...149..475B. ISSN 0004-6361.
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