Triangulum Galaxy (M33) and its HII regions (Massimo Di Fusco)

Triangulum Galaxy (M33) and its HII regions

Generally I don't publish the work I do for others, but for this wonderful M33 I'll gladly make an exception. The data were acquired by my amateur astrophotographer friend Giacomo Gotra from his beautiful Tuscan sky and I did the rest.
In this composition, I wanted to highlight the countless HII regions of the Triangulum Galaxy (M33). Of these, 14 are included in the famous NGC and IC catalogs while the remainder are described in more recent scientific papers and the acronyms (taken from SIMBAD) are the initials of the authors of the articles.The lesser-known HII areas are made up of various regions that have different acronyms and I have assigned only one of them for simplicity.

Below is a detailed description of the catalog acronyms and bibliographical references:
- CPSDP (Courtes+Petit+Sivan+Dodonov+Petit). H-alpha survey of M 33 with the six-meter telescope: morphology of the general diffuse emission, evidence for a chaotic medium of bubbles and filaments, Astronomy and Astrophysics, volume 174, 28-56 (1987).
- [LHK2017] (Lin+Hu+Kong+, 2017). Spectroscopic observation and analysis of H II regions in M33 with MMT: temperatures and oxygen abundances, Astrophys. J., 842, 97-97 (2017).
- BCLMP (Boulesteix+Courtes+Laval+Monnet+Petit). An optical study of M 33: I. Morphology of the gas, Astron. Astrophys., 37, 33-48 (1974).
- [LBW2010] (Long+Blair+Winkler+, 2010). The Chandra ACIS survey of M33: X-ray, optical, and radio properties of the supernova remnants, Astrophys. J., Suppl. Ser., 187, 495-559 (2010).
- [RVP2013] (Relano+Verley+Perez+, 2013). Spectral energy distributions of HII regions in M33 (HerM33es), Astron. Astrophys., 552A, 140-140 (2013).
- [GDK99] (Gordon+Duric+Kirshner+, 1999). A new sample of radio-selected and optically confirmed supernova remnants in M33, Astrophys. J., Suppl. Ser., 120, 247-264 (1999).

	Distinct awarded users	Total awarded images
Image of the day
Top picks
Top pick nominations

	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

Submitted The date and time when you submitted this image for IOTD/TP consideration.	...
Views by Submitters (available since September 19th, 2023) Every image is assigned to 50% of available Submitters. In the event that at least 80% of them don't view the image before its time in the IOTD/TP process expires, it's assigned to the other 50% of Submitters and the process begins anew.
Promotions by Submitters When 3 distinct Submitters promote the image, it moves on to the next stage of the process: evaluation for Top Pick status. This requirement, in addition to anonymization of images and distribution to only a subset of them, prevents biases and ensures that the best images are selected.
Promotions by Reviewers When 3 distinct Reviewers promote the image, it moves on to the next stage of the process: evaluation for IOTD status.
Early dismissal Staff members have a lot of images to inspect on a daily basis, and they can dismiss images if they believe they don't meet the requirements for IOTD/TP selection. If an image is dismissed 5 times, it's removed from the process. This streamlines the process and ensures that any bias present in promotions could be overruled by other staff members.

Status	Advanced success
Started	...
Astrometry.net job	9269957
PixInsight job	9D94QTM74MTEPKZ1Y3MEMC8IY72220TL
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	01h33m51s.83
RA (top/left)	01h31m15s.30
RA (top/right)	01h31m53s.98
RA (bottom/right)	01h36m25s.45
RA (bottom/left)	01h35m54s.92

Dec (center)	+30°39′12″.3
Dec (top/left)	+31°14′27″.2
Dec (top/right)	+29°57′59″.9
Dec (bottom/right)	+30°03′24″.5
Dec (bottom/left)	+31°20′37″.6

Image Index:

Contribution Index (beta):