Deep Chandra Observations of A2495: A Possible Sloshing-regulated Feedback Cycle in a Triple-offset Galaxy Cluster
We present the analysis of new, deep Chandra observations (130 ks) of the galaxy cluster A2495. This object is known for the presence of a triple offset between the peaks of the intracluster medium (ICM), the brightest cluster galaxy (BCG), and the warm gas glowing in H α line. The new Chandra data...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad1755 |
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| author | L. Rosignoli F. Ubertosi M. Gitti F. Brighenti T. Pasini E. O’Sullivan F. Gastaldello M. Gaspari P. Temi |
| author_facet | L. Rosignoli F. Ubertosi M. Gitti F. Brighenti T. Pasini E. O’Sullivan F. Gastaldello M. Gaspari P. Temi |
| author_sort | L. Rosignoli |
| collection | DOAJ |
| description | We present the analysis of new, deep Chandra observations (130 ks) of the galaxy cluster A2495. This object is known for the presence of a triple offset between the peaks of the intracluster medium (ICM), the brightest cluster galaxy (BCG), and the warm gas glowing in H α line. The new Chandra data confirm that the X-ray emission peak is located at a distance of ∼6.2 kpc from the BCG, and at ∼3.9 kpc from the H α emission peak. Moreover, we identify two generations of X-ray cavities in the ICM, likely inflated by the central radio galaxy activity. Through a detailed morphological and spectral analysis, we determine that the power of the active galactic nucleus (AGN) outbursts ( P _cav = 4.7 ± 1.3 × 10 ^43 erg s ^−1 ) is enough to counterbalance the radiative losses from ICM cooling ( L _cool = 5.7 ± 0.1 × 10 ^43 erg s ^−1 ). This indicates that, despite a fragmented cooling core, A2495 still harbors an effective feedback cycle. We argue that the offsets are most likely caused by sloshing of the ICM, supported by the presence of spiral structures and a probable cold front in the gas at ∼58 kpc east of the center. Ultimately, we find that the outburst interval between the two generations of X-ray cavities is of the order of the dynamical sloshing timescale, as already hinted from the previous Chandra snapshot. We thus speculate that sloshing may be able to regulate the timescales of AGN feedback in A2495, by periodically fueling the central AGN. |
| first_indexed | 2024-03-07T23:03:09Z |
| format | Article |
| id | doaj.art-6c5dbc38a95142e3b0021bfd9cc0b686 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-07T23:03:09Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-6c5dbc38a95142e3b0021bfd9cc0b6862024-02-22T09:24:11ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-019631810.3847/1538-4357/ad1755Deep Chandra Observations of A2495: A Possible Sloshing-regulated Feedback Cycle in a Triple-offset Galaxy ClusterL. Rosignoli0https://orcid.org/0000-0002-0327-5929F. Ubertosi1https://orcid.org/0000-0001-5338-4472M. Gitti2https://orcid.org/0000-0002-0843-3009F. Brighenti3https://orcid.org/0000-0001-9807-8479T. Pasini4https://orcid.org/0000-0002-9711-5554E. O’Sullivan5https://orcid.org/0000-0002-5671-6900F. Gastaldello6https://orcid.org/0000-0002-9112-0184M. Gaspari7https://orcid.org/0000-0003-2754-9258P. Temi8https://orcid.org/0000-0002-8341-342XDipartimento di Fisica e Astronomia (DIFA), Università di Bologna , via Gobetti 93/2, I-40129 Bologna, Italy; Istituto Nazionale di Astrofisica (INAF) , Osservatorio di Astrofisica e Scienza dello Spazio, via P. Gobetti 93/3, I-40129 Bologna, ItalyDipartimento di Fisica e Astronomia (DIFA), Università di Bologna , via Gobetti 93/2, I-40129 Bologna, Italy; Istituto Nazionale di Astrofisica (INAF) , Osservatorio di Astrofisica e Scienza dello Spazio, via P. Gobetti 93/3, I-40129 Bologna, ItalyDipartimento di Fisica e Astronomia (DIFA), Università di Bologna , via Gobetti 93/2, I-40129 Bologna, Italy; Istituto Nazionale di Astrofisica (INAF) - Istituto di Radioastronomia (IRA) , via Gobetti 101, I-40129 Bologna, ItalyDipartimento di Fisica e Astronomia (DIFA), Università di Bologna , via Gobetti 93/2, I-40129 Bologna, Italy; University of California/Lick Observatory, Department of Astronomy and Astrophysics, University of California , Santa Cruz, CA 95064, USAIstituto Nazionale di Astrofisica (INAF) - Istituto di Radioastronomia (IRA) , via Gobetti 101, I-40129 Bologna, ItalyCenter for Astrophysics ∣ Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138, USAINAF-IASF Milano , via E. Bassini 15, I-20133 Milano, ItalyDept. of Astrophysical Sciences, Princeton University , 4 Ivy Lane, Princeton, NJ 08544, USAAstrophysics Branch, NASA-Ames Research Center , MS 245-6, Moffett Field, CA 94035, USAWe present the analysis of new, deep Chandra observations (130 ks) of the galaxy cluster A2495. This object is known for the presence of a triple offset between the peaks of the intracluster medium (ICM), the brightest cluster galaxy (BCG), and the warm gas glowing in H α line. The new Chandra data confirm that the X-ray emission peak is located at a distance of ∼6.2 kpc from the BCG, and at ∼3.9 kpc from the H α emission peak. Moreover, we identify two generations of X-ray cavities in the ICM, likely inflated by the central radio galaxy activity. Through a detailed morphological and spectral analysis, we determine that the power of the active galactic nucleus (AGN) outbursts ( P _cav = 4.7 ± 1.3 × 10 ^43 erg s ^−1 ) is enough to counterbalance the radiative losses from ICM cooling ( L _cool = 5.7 ± 0.1 × 10 ^43 erg s ^−1 ). This indicates that, despite a fragmented cooling core, A2495 still harbors an effective feedback cycle. We argue that the offsets are most likely caused by sloshing of the ICM, supported by the presence of spiral structures and a probable cold front in the gas at ∼58 kpc east of the center. Ultimately, we find that the outburst interval between the two generations of X-ray cavities is of the order of the dynamical sloshing timescale, as already hinted from the previous Chandra snapshot. We thus speculate that sloshing may be able to regulate the timescales of AGN feedback in A2495, by periodically fueling the central AGN.https://doi.org/10.3847/1538-4357/ad1755Galaxy clustersAbell clustersActive galactic nucleiCooling flowsIntracluster medium |
| spellingShingle | L. Rosignoli F. Ubertosi M. Gitti F. Brighenti T. Pasini E. O’Sullivan F. Gastaldello M. Gaspari P. Temi Deep Chandra Observations of A2495: A Possible Sloshing-regulated Feedback Cycle in a Triple-offset Galaxy Cluster The Astrophysical Journal Galaxy clusters Abell clusters Active galactic nuclei Cooling flows Intracluster medium |
| title | Deep Chandra Observations of A2495: A Possible Sloshing-regulated Feedback Cycle in a Triple-offset Galaxy Cluster |
| title_full | Deep Chandra Observations of A2495: A Possible Sloshing-regulated Feedback Cycle in a Triple-offset Galaxy Cluster |
| title_fullStr | Deep Chandra Observations of A2495: A Possible Sloshing-regulated Feedback Cycle in a Triple-offset Galaxy Cluster |
| title_full_unstemmed | Deep Chandra Observations of A2495: A Possible Sloshing-regulated Feedback Cycle in a Triple-offset Galaxy Cluster |
| title_short | Deep Chandra Observations of A2495: A Possible Sloshing-regulated Feedback Cycle in a Triple-offset Galaxy Cluster |
| title_sort | deep chandra observations of a2495 a possible sloshing regulated feedback cycle in a triple offset galaxy cluster |
| topic | Galaxy clusters Abell clusters Active galactic nuclei Cooling flows Intracluster medium |
| url | https://doi.org/10.3847/1538-4357/ad1755 |
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