Skip navigation
  • INAF logo
  • Home
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects
  • Explore by
    • Research outputs
    • Researchers
    • Organization units
    • Projects
  • Login:
    • My DSpace
    • Receive email
      updates
    • Edit Account details
  • Italian
  • English

  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29621
Title: Nature of the unusual transient AT 2018cow from HI observations of its host galaxy
Authors: Michałowski, Michał J.
Kamphuis, P.
Hjorth, J.
Kann, D. A.
de Ugarte Postigo, A.
Galbany, L.
Fynbo, J. P. U.
Ghosh, A.
HUNT, Leslie Kipp 
Kuncarayakti, H.
Le Floc'h, E.
Leśniewska, A.
Misra, K.
Nicuesa Guelbenzu, A.
PALAZZI, ELIANA 
Rasmussen, J.
Resmi, L.
ROSSI, Andrea 
Savaglio, S.
Schady, P.
Schulze, S.
Thöne, C. C.
Watson, D.
Józsa, G. I. G.
SERRA, PAOLO 
Smirnov, O. M.
Issue Date: 2019
Journal: ASTRONOMY & ASTROPHYSICS 
Number: 627
First Page: A106
Abstract: Context. Unusual stellar explosions represent an opportunity to learn about both stellar and galaxy evolution. Mapping the atomic gas in host galaxies of such transients can lead to an understanding of the conditions that trigger them. <BR /> Aims: We provide resolved atomic gas observations of the host galaxy, CGCG137-068, of the unusual and poorly understood transient AT 2018cow, which we obtained in searching for clues to understand its nature. We test whether it is consistent with a recent inflow of atomic gas from the intergalactic medium, as suggested for host galaxies of gamma-ray bursts (GRBs) and some supernovae (SNe). <BR /> Methods: We observed the HI hyperfine structure line of the AT 2018cow host with the Giant Metrewave Radio Telescope. <BR /> Results: There is no unusual atomic gas concentration near the position of AT 2018cow. The gas distribution is much more regular than the distributions of GRB/SN hosts. The AT 2018cow host has an atomic gas mass lower by 0.24 dex than predicted from its star formation rate (SFR) and is at the lower edge of the galaxy main sequence. In the continuum we detected the emission of AT 2018cow and of a star-forming region in the north-eastern part of the bar (away from AT 2018cow). This region hosts a third of the galaxy's SFR. <BR /> Conclusions: The absence of atomic gas concentration close to AT 2018cow, along with a normal SFR and regular HI velocity field, sets CGCG137-068 apart from GRB/SN hosts studied in HI. The environment of AT 2018cow therefore suggests that its progenitor may not have been a massive star. Our findings are consistent with an origin of the transient that does not require a connection between its progenitor and gas concentration or inflow: an exploding low-mass star, a tidal disruption event, a merger of white dwarfs, or a merger between a neutron star and a giant star. We interpret the recently reported atomic gas ring in CGCG 137-068 as a result of internal processes connected with gravitational resonances caused by the bar. <P />The HI data cube and moment maps are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr/">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/627/A106">http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/627/A106</A>
URI: http://hdl.handle.net/20.500.12386/29621
URL: https://www.aanda.org/articles/aa/full_html/2019/07/aa35372-19/aa35372-19.html
ISSN: 0004-6361
DOI: 10.1051/0004-6361/201935372
Bibcode ADS: 2019A&A...627A.106M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

Files in This Item:
File Description SizeFormat 
2019A+A.627.A106Michalowski.pdfpdf editoriale2.26 MBAdobe PDFView/Open
Show full item record

Page view(s)

4
checked on Jan 16, 2021

Download(s)

1
checked on Jan 16, 2021

Google ScholarTM

Check

Altmetric


Items in DSpace are published in Open Access, unless otherwise indicated.


Explore by
  • Communities
    & Collections
  • Research outputs
  • Researchers
  • Organization units
  • Projects

Informazioni e guide per autori

https://openaccess-info.inaf.it: tutte le informazioni sull'accesso aperto in INAF

Come si inserisce un prodotto: le guide a OA@INAF

La Policy INAF sull'accesso aperto

Documenti e modelli scaricabili

Feedback
Built with DSpace-CRIS - Extension maintained and optimized by Logo 4SCIENCE